CN201716111U - Multi-band infrared radiation automatic measuring system - Google Patents

Abstract

The utility model provides a multiband infrared radiation automatic measuring system, but the infrared radiation characteristic of measured object in different wave bands under the complicated background of in good time automatic measurement satisfies the demand of long-term trouble-free automatic observation radiometric calibration measurement completely. The multiband infrared radiation automatic measuring system comprises a scanning device, a light splitting device, an infrared detection device and a control system/circuit, wherein the scanning device, the light splitting device and the infrared detection device are sequentially arranged on a light path in a radiation incidence direction; the scanning device comprises a rotatable protection window, a rotary reflecting mirror and a fixed double-blackbody correction component. The utility model uses the spectrum light splitting and wave band modulation scanning technology, selects two medium and long wave detectors to match with the spectrum light splitting and wave band modulation scanning technology, increases the measurable optical channel, and effectively forms the radiation calibration measurement to more long wave and medium wave bands; and the radiation size required by the black body radiation cavity is compressed, the difficulty in designing and manufacturing the black body is reduced, and the controllable precision is improved.

Description

Multiband Infrared Radiation Automatic Measuring System

technical field

The utility model relates to an infrared radiation measurement technology, in particular to a multi-band infrared radiation automatic measurement system, especially for real-time monitoring of seawater temperature.

Background technique

It is a relatively mature technology to measure the temperature of objects by infrared method. There are also many researches on various infrared radiometers at home and abroad. Accuracy generally varies with operating environment.

When the infrared radiometer works in the field, it is easy to be affected by the following factors to affect the measurement accuracy.

The response coefficient of the detector changes due to changes in the ambient temperature, or the aging of the detector chip and processing circuit;

II The aging of the film layer of the infrared optical system leads to changes in the transmittance of the optical system;

Changes in the temperature of the III radiometer's internal housing cause changes in the background infrared radiation flux received by the detector that is remaining reflected from the surface of the optical parts.

The combination of these factors can seriously affect the accuracy of the instrument.

When the infrared radiometer measures the temperature of the target, the selected band is usually the long-wave band, which is determined by the radiation characteristics of the target. In this band, object measurement can usually obtain high accuracy at a low cost, such as CIRIMS (9.6μm ~11.5μm), SISTER(10.8μm), ISAR((9.6μm～11.5μm). However, there are differences in the emissivity of different infrared bands, and correspondingly, the infrared radiation emission of objects at the same temperature also changes. When the space-borne infrared spectroradiometer or infrared imaging radiometer detects the ground, according to the different detection objects, the spectral detection range includes not only the long-wave infrared, but also a wider working band such as the medium-wave infrared. Therefore, a single band in the satellite Calibration measurement has certain limitations.

At present, foreign infrared radiation measurement equipment has its own advantages and disadvantages according to different working principles. The equipment including multiple bands mainly includes M-AERI (3μm～18μm) as Fourier infrared spectrum radiation testing equipment, and AVHRR (3.8μm～10.6μm) as Infrared imaging radiation temperature measurement equipment, but these two instruments have complex structures and are expensive, and are not suitable for popularization and application under harsh conditions in the field; the French CE312 equipment is small in size, high in sensitivity, and easy to carry, but because it does not have a reference The measurement accuracy of blackbody usually changes with different working environments, and it also needs to be operated manually according to its temperature measurement principle, and automatic observation cannot be realized; ISAR is a specially developed seawater surface temperature observation device, which comes with two calibration blackbodies, which can realize Automatic observation of sea surface temperature is required, but it is only measured in the long wave band. At present, there is no similar measuring equipment in China that is suitable for measuring the radiation of objects in complex backgrounds under harsh conditions in the field. High-precision calibration equipment.

Utility model content

The utility model provides a multi-band infrared radiation automatic measurement system. As an independent innovation achievement of similar technologies at home and abroad, the multi-band infrared radiation automatic measurement system refers to the results and experience of foreign related equipment design and application, and is closely combined with the actual situation. It is used to develop high-precision calibration equipment under harsh outdoor conditions. It comes with two reference black bodies. The band range covers multiple bands of mid-wave infrared and long-wave infrared, which can not only improve the measurement accuracy, but also be used for satellite data. Calibration, technically select reasonable devices and design schemes, reduce development costs, achieve the purpose of popularization, through reliability design, timely and automatically measure the infrared radiation characteristics of the measured object in different bands under complex backgrounds, fully meet the long-term The need for trouble-free automatic observation of radiometric calibration measurements.

The technical scheme of the utility model is as follows:

The multi-band infrared radiation automatic measurement system includes a scanning device, a spectroscopic device, an infrared detection device and a control system/circuit, wherein the scanning device, the spectroscopic device, and the infrared detection device are sequentially arranged on the optical path in the radiation incident direction; the scanning device consists of a moving part and a It consists of a fixed part, wherein the moving part includes a protective window and a rotating mirror, and the fixed part includes a double blackbody correction component; the protective window is set at the front end of the optical path in the radiation incident direction, the relative position of the rotating mirror and the protective window is constant, and the double blackbody The correction component is composed of a normal temperature blackbody, a temperature control blackbody, and their own independent power supply and control system; the beam splitting device includes a relay mirror and a beam splitter arranged in sequence on the optical path; the infrared detection device is composed of a long-wave detection component and a medium-wave detection component;

Let the optical path between the protective window and the rotating reflector be segment A, the optical path between the rotating reflector and the beam splitter be segment B, the optical path between the beam splitter and the long-wave detector be segment C, and the optical path between the beam splitter and the center The optical path between the wave detectors is the D-section optical path, and the plane formed by the optical axis of the A-section optical path and the B-section optical axis is perpendicular to the mirror surface of the rotating mirror, and the rotating mirror and the protective window can be controlled by the B-section The optical axis rotates on the central axis; in the rotating field of view of the protective window, there are external interference radiation areas, measured target radiation areas, normal temperature black body radiation areas and temperature control black body radiation areas. The above four radiation areas are rotated by the rotating mirror When reaching the corresponding position, the optical axis of the optical path formed therewith is located on the same plane and intersects at the same point on the rotating mirror. The external interference radiation area scans the passage of external interference radiation as a rotating reflector. For example, when the measured target is sea water (water temperature), the external interference is mainly the radiation from the sky reflected by the surface of the sea water. Therefore, the rotating reflector can be selected. A certain area above the mirror surface is the external interference radiation area, and a certain area below the mirror surface of the rotating mirror is the measured target radiation area.

The above-mentioned long-wave detection component includes a long-wave filter, a long-wave focus lens and a long-wave detector arranged in sequence on the optical path, and the medium-wave detection component includes a medium-wave filter, a medium-wave focus lens, and a medium-wave refrigeration detector arranged in sequence on the optical path The long-wave filter is composed of a plurality of band-pass filters of different wavelength ranges, and the position of each band-pass filter can be controlled to move.

The above-mentioned long-wave filter is a filter turntable composed of multiple bandpass filters of different wavelength ranges arranged symmetrically in the center. The filter turntable is driven by a rotating motor, and the C-section optical path only passes through one of the bandpass filters each time. filter.

The optical axis of the above-mentioned section B optical path forms an angle of 45 degrees with the mirror surface of the rotating mirror, which ensures that the incident light path and the outgoing light path of the rotating mirror are at 90 degrees, which is convenient for the overall space design of the automatic measurement system.

The above-mentioned moving part is packaged as a scanning reflection component, the optical path is sealed from the rear of the relay mirror, and protected by nitrogen filling, and the internal optical system and detector are kept dry with a solid desiccant.

The above-mentioned two blackbody sources respectively located in the normal temperature blackbody radiation area and the temperature control blackbody radiation area are normal temperature surface source blackbody and temperature control surface source blackbody, and the distance between the scanning reflection component and the radiation outlets of the two blackbody sources is not greater than 10mm .

The coupling parameters of the long-wave focusing lens are consistent with the long-wave detector, and the coupling parameters of the medium-wave focusing lens are consistent with the medium-wave cooling detector.

The outer surface of the protective window is coated with a diamond-like high-efficiency infrared anti-reflection coating, and the surface of the rotating mirror is coated with a silver outer reflection coating and additionally protected by a dielectric.

The control system/circuit mentioned above includes the control of the rotating mirror and the control of the filter wheel.

The above-mentioned long-wave detector is a pyroelectric detector, and the medium-wave cooling detector is a medium-wave HgCdTe detector.

The utility model advantage is summarized as follows:

1. Adopt double black body real-time correction system to eliminate the inconsistency between the internal radiation and detection response of the infrared radiometer, and achieve the purpose of real-time correction;

2. Using spectral splitting and band modulation scanning technology, two medium- and long-wave detectors are selected to match it, increasing the measurable optical channel, and effectively forming radiation calibration measurements for more long-wave and medium-wave bands;

3. The internal optical system compresses the radiation size required by the black body radiation cavity through appropriate optical path transformation, reduces the difficulty of black body design and manufacture, and improves the controllable accuracy;

4. Through the reliability design, this product can fully meet the needs of long-term trouble-free automatic observation radiation calibration measurement, which makes it more widely used.

Description of drawings

Figure 1 is a schematic diagram of the influence of sky background on seawater radiation measurement;

Fig. 2 is a schematic diagram of the scanning reflection component and its working principle;

3 is a schematic diagram of the structure and principle of the scanning device, wherein a is a schematic diagram of the structure of the scanning device (schematic representation of the three-dimensional internal structure), and b is a schematic diagram of the working principle of the scanning device;

Fig. 4 is the infrared optical system structure of the present utility model and optical path schematic diagram;

Fig. 5 is a schematic diagram of the structure of the filter wheel.

Fig. 6 is the overall schematic diagram of the utility model system.

Explanation of reference numbers:

1-Scanning reflection assembly, 11-Rotating mirror, 12-Protection window, 2-Normal temperature black body, 3-Temperature control black body, 4-Drive unit, 5-Rear optical system, 6-Infrared detector, 51-Relay mirror , 52-beam splitter, 53-long-wave filter (filter wheel), 530-bandpass filter, 54-long-wave focusing coupling lens, 55-medium-wave filter, 56-medium-wave focusing coupling lens, 61-Long wave detector, 62-Medium wave cooling detector, 7-A section optical path, 8-B section optical path, 9-C section optical path, 10-D section optical path.

Detailed ways

The multi-band infrared radiation automatic measurement system provided by the utility model mainly adopts the working mode of scanning the height, normal temperature blackbody, sky and seawater surface by the rotating reflector. Here, the radiation from the sky is regarded as external interference radiation, and the radiation from sea water is regarded as the measured target radiation. Scanning temperature-controlled blackbody and normal temperature blackbody can correct the photoelectric response coefficient of the infrared detection system in real time, eliminating the influence of changes in the transmittance of the infrared optical system or changes in the ambient temperature, and changes in the response coefficient of the detector; scanning the sky and sea surface to correct the sea-air background Effect of radiation on seawater radiometric thermometry.

Referring to the overall schematic diagram of the system in Figure 6, the external scene and the real-time calibration standard source enter the observation field of the infrared optical system in turn through the scanning component. The optical system focuses the external infrared radiation on the detection surface of the infrared detector. The size of the corresponding output voltage or current value, pre-processed by the preamplifier, the tiny voltage or current value is converted into a voltage value proportional to the infrared radiation, the central controller and the timer through the timing control signal acquisition and The data processing operation component collects the voltage value of each target in the external scene and the black body in different bands, and after A/D conversion, it is quantified into response data, and the relevant data is transmitted to the control console through the RS485 serial port and displayed, so as to achieve the seawater surface temperature for monitoring purposes.

In addition, the automatic protection device is used to protect the main body of the measuring system of the present invention from being damaged by the external environment such as weather conditions. For example, if the utility model is installed on a ship, when there is a storm at sea, the automatic protection device can provide cover, lightning protection treatment or directly close the protection window.

The detailed implementation method includes the following parts:

1. Scene infrared radiation separation and standard radiation source real-time correction

The scene contains seawater and sky, the seawater is the target to be tested, and the sky is the background. The real-time correction blackbody source is two blackbodies with different temperatures, one of which is a normal temperature blackbody with a fixed temperature, and the other is a temperature-controlled blackbody. The two blackbodies are surface source blackbodies, the radiation cavity has an emissivity greater than 0.998, and the temperature uniformity and temperature control accuracy are greater than 0.1K. In the scheme, the method of scanning the sky and the standard radiation source is mainly used to realize the separation of the seawater infrared radiation and the sky radiation in the scene, and the radiometer response coefficient is corrected in real time through the standard radiation source. The specific principles are as follows:

Scene separation:

Figure 1 illustrates some factors that need to be considered when the infrared radiometer (multi-band infrared radiation automatic measurement system) measures the infrared radiation of seawater. If the surface of seawater is a perfect radiator, its spectral radiation can be directly measured, and the temperature of seawater can be calculated according to Planck's formula. However, the emissivity of seawater is slightly less than 1, which is slightly different according to the radiation wavelength and radiation angle. Therefore, the infrared radiation entering the radiometer contains a small fraction of the radiation from the atmosphere. In order to accurately measure the radiation of seawater, it is necessary to measure the atmospheric radiation reflected by the seawater below as the background at the same time, and to know exactly the value of the emissivity ε of the seawater surface. According to previous research and tests, in calm sea water in the range of 9 μm-12 μm, and in the range of zenith angle θ<40°, the emissivity ε has a maximum value of >0.98.

The infrared radiometer has built-in different band filters. When measuring, select the band channel to be measured, measure the upward atmospheric infrared radiation, measure the downward seawater infrared radiation and the atmospheric infrared radiation reflected by the sea level, and measure the zenith angle θ<40°, the sky background and the sky background reflected by the sea level belong to the same area.

Set the infrared radiation measured downwards as M _down ,

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; down</span>}}<span\; class="notranslate">\; =</span>\frac{{<span\; class="notranslate">\; \&Integral;</span>}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; sea</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; the\; sky</span>}}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; d\&lambda;</span>}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula (1), ε _λ is the emissivity of the surface of seawater at a specified wavelength, and L _sea is the infrared radiation emission rate of a blackbody at the same temperature on the surface of seawater, namely

${\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; sea</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="hc"\; filenames="HDA0000020132090000031.png"\; state="\{\{state\}\}">hc</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; hc</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;kT</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ]</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Where τ _λ is the transmittance of the optical system at a specific wavelength.

When the band range is narrow, τ _λ and ε _λ can be regarded as constants, at this time

When calibrated by bold body, M _down = M _TA ×τ (4)

Among them is the infrared radiation output degree of the M _TA black body at the temperature TA,

Upward infrared radiation M _up , M _up =τ×L _sky (5)

When calibrated by black body, M _down = M _TB ×τ (6)

Among them, M _TB is the infrared radiation output degree of the black body at the temperature TB, according to (3)~(6), it can be solved as follows:

${\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; sea</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; TA</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; TB</span>}}}{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Because the mid-wave infrared emissivity ε is slightly different from that of long-wave, ε _λ can be directly given according to previous research results, or can be obtained from on-site measurement. The measurement method is as follows:

When the equipment is used for the first time, the surface temperature of seawater is directly measured with a water thermometer, and the scene integrated infrared radiation blackbody equivalent temperature measured by the infrared radiometer, the sky infrared radiation blackbody equivalent temperature and the temperature value of the water thermometer are respectively calculated according to (2) formula L _sea , M _TA and M _TB , substituting L _sea , M _TA and M _TB into formula (7) to calculate seawater infrared emissivity ε _λ .

After the infrared emissivity ε _λ is measured or given, the infrared radiation on the seawater surface can be calculated according to formula (7), and the seawater surface temperature can be calculated according to formula (2).

real-time correction

When the infrared radiometer works in the field, it is easy to be affected by the following factors to affect the measurement accuracy.

I The response coefficient of the detector changes due to the change of the ambient temperature, or the aging of the detector chip and processing circuit.

II The aging of the film layer of the infrared optical system leads to changes in the transmittance of the optical system.

Changes in the temperature of the III radiometer's internal housing cause changes in the background infrared radiation flux received by the detector that is remaining reflected from the surface of the optical parts.

The combination of these factors can seriously affect the accuracy of the instrument.

The method of real-time correction of double black body standard radiation sources can eliminate the influence of the above factors. The specific principle can be explained by the following mathematical process.

In the selection of the detector, select the area with better radiation response linearity, then the infrared radiation and voltage or current response of the detector can be expressed by formula (8):

D＝A×L+B (8)

In the formula, D is the voltage or current response value, A is the response coefficient, L is the infrared radiation collected on the surface of the detector, and B is a constant.

Infrared radiation L includes shell infrared radiation L _S remaining reflected from the surface of internal optical components, and infrared radiation L _o transmitted by the target through the optical system. In a short period of time, the temperature of the shell changes little. Therefore, in each time interval , it can be considered that L _S is a constant, then (8) can be described as

D＝A×L _o +B (9)

When the scanning mirror is aligned with a temperature-controlled, room-temperature black body, according to formula (9):

D ₁ =A×L _o1 +B (10)

D ₂ =A×L _o2 +B

L _o1 and L _o2 can be calculated according to control and normal temperature blackbody temperature combined with formula (2).

D ₁ and D ₂ are voltage or current values obtained when observing black bodies at different temperatures.

According to formula (10), the response coefficient A and constant B can be calculated, and then the value of infrared radiation L can be obtained through formula (8) according to the response value D of the unknown temperature.

2. Scan reflective components

The moving part of the scanning device is mainly the scanning reflection assembly, and the core component of the scanning reflection assembly is a rotating mirror, as shown in Figure 2 and Figure 3, the rotating mirror is 45° relative to the axis of rotation (that is, the optical axis of section B optical path 8). Placed, the scanning reflector assembly 1 is driven to rotate around the rotation axis by the driving unit 4 (generally adopting a stepping motor), and the rotation axis coincides with the optical axis of the rear optical system. The rotating mirror 11 rotates 360° to scan the external interference scene (i.e. the sky), the measured target scene (i.e. sea water) and the built-in black body source (normal temperature black body 2 and temperature control black body 3) in turn, and the infrared radiation is sequentially introduced into the Rear infrared optical system 5.

3. Infrared optical system

The structure and optical path of the infrared optical system are shown in Figure 4.

The infrared radiation of the above-mentioned four radiation sources (scenes) passes through the protective window 12 and the rotating mirror 11, and is projected on the relay mirror 51. The relay mirror changes the optical path, compresses the optical path size on the one hand, and makes the light structure suitable for the light beam on the other hand. Spectroscopy and beam filtering. After passing through the beam splitter 52 , the optical path is divided into two parts, one part enters the medium-wave focusing coupling lens 56 , and the other part enters the long-wave focusing coupling lens 54 . The long-wave filter 53 is a filter turntable 53 (also known as a filter dial) composed of three bandpass filters 530. The range of wavelength bands is to be determined according to requirements. The mirror turntable 53 is driven by a stepping motor to rotate according to requirements. The structure of the filter turntable 53 is shown in FIG. 5 . If the long-wave detector 61 is required to receive as many wave bands as possible for analysis, then the cycle of the step rotation of the rotating mirror 11 can be extended to cooperate with the long-wave filter 53 to complete the radiation reception of each wave band (three band-pass filters) The light sheet 530 rotates to the C section of the light path in turn).

The coupling lens focuses the infrared radiation on the infrared detector, and the coupling parameters of the design of the focusing lens are consistent with the detector to ensure the maximum light energy receiving efficiency.

The outer surface of the protection window is coated with a diamond-like high-efficiency infrared anti-reflection coating, and the surface of the scanning mirror is coated with a silver outer reflection film and additionally protected by a dielectric. The rear of the relay mirror is sealed as a whole and filled with nitrogen for protection, and a solid desiccant is used to keep the internal optical system and detector dry, thereby ensuring that the transmittance of the optical system does not change greatly.

The multi-band infrared radiation automatic measurement system uses two infrared detectors, one is a pyroelectric detector, which works in the long-wave band, and the other is a medium-wave HgCdTe detector.

The long-wave pyroelectric detector adopts the domestic GAT500 detector, and the GAT500 preprocessing circuit has a preamplifier, and the amplifier magnification is greater than 1000 times.

Medium wave chooses the PCI-2TE-5 product of Poland VIGO company. The medium-wave infrared measurement target is mainly suitable for the environment with high temperature. When the ambient temperature drops to -60°C, the radiation amount of the medium-wave infrared will drop by 4 orders of magnitude, and the signal is too weak to achieve accurate measurement.

The infrared signal detected by the infrared detector is transformed into a voltage signal through the built-in pre-amplification circuit, and the small signal is amplified to an appropriate voltage value through the subsequent voltage follower circuit, low-pass filter circuit and proportional amplification circuit to meet the needs of the signal. Dynamic range detection requirements.

The multi-band infrared radiation automatic measurement system of the specific embodiment provided by the utility model uses spectrum splitting and band modulation scanning technology, and selects two medium and long wave detectors to match it, so that the number of measurable optical channels is increased to 4, with With 3 bands of long-wave and 1 band of medium-wave infrared, radiation calibration measurement of more bands can be completed, and it has a wider range of uses. The internal optical system compresses the radiation size required by the black body radiation cavity through proper optical path transformation, reduces the difficulty of black body design and manufacture, and improves the controllable precision. In addition, through the reliability design, this product can fully meet the needs of long-term trouble-free automatic observation radiation calibration measurement.

Claims (9)

1. A multi-band infrared radiation automatic measurement system is characterized in that: the automatic measurement system includes a scanning device, a spectroscopic device, an infrared detection device and a control system/circuit; the scanning device, a spectroscopic device, and an infrared detection device are arranged successively On the optical path of the radiation incident direction; the scanning device is composed of a moving part and a fixed part, the moving part includes a protective window and a rotating mirror, and the fixed part includes a double blackbody correction component; the protective window is set at the forefront of the optical path of the radiation incident direction , the relative position of the rotating mirror and the protective window is constant, the double black body correction component is composed of a normal temperature black body, a temperature control black body, and their own independent power supply and control system; the beam splitting device includes a relay mirror and a beam splitter arranged in sequence on the optical path; The device is composed of long-wave detection components and medium-wave detection components; Let the optical path between the protective window and the rotating reflector be segment A, the optical path between the rotating reflector and the beam splitter be segment B, the optical path between the beam splitter and the long-wave detector be segment C, and the optical path between the beam splitter and the center The optical path between the wave detectors is the D-section optical path, and the plane formed by the optical axis of the A-section optical path and the B-section optical axis is perpendicular to the mirror surface of the rotating mirror, and the rotating mirror and the protective window can be controlled by the B-section The optical axis rotates on the central axis; in the rotating field of view of the protective window, there are external interference radiation areas, measured target radiation areas, normal temperature black body radiation areas and temperature control black body radiation areas. The above four radiation areas are rotated by the rotating mirror When reaching the corresponding position, the optical axis of the optical path formed therewith is located on the same plane and intersects at the same point on the rotating mirror. 2. The multi-band infrared radiation automatic measurement system according to claim 1, characterized in that: the long-wave detection assembly includes a long-wave filter, a long-wave focusing lens, and a long-wave detector arranged in sequence on the optical path, and the medium-wave detection assembly It includes a medium-wave filter, a medium-wave focusing lens and a medium-wave cooling detector arranged in sequence on the optical path; the long-wave filter is composed of a plurality of band-pass filters of different wavelength ranges, and each band-pass filter The position of the light sheet can be moved in a controlled manner. 3. The multi-band infrared radiation automatic measurement system according to claim 2, characterized in that: the long-wave filter is a filter composed of a plurality of band-pass filters of different wave band ranges arranged symmetrically according to the center The turntable and the filter turntable are driven by a rotating motor, and the C-section optical path only passes through one of the bandpass filters at a time. 4. The multi-band infrared radiation automatic measurement system according to claim 2 or 3, characterized in that: the optical axis of the B-section optical path forms an angle of 45 degrees with the mirror surface of the rotating mirror. 5. The multi-band infrared radiation automatic measurement system according to claim 4, characterized in that: said moving part is packaged as a scanning reflection assembly, the optical path is integrally sealed from behind the relay mirror, and filled with nitrogen for protection, with solid desiccant Keep the internal optics and detector dry. 6. The multi-band infrared radiation automatic measurement system according to claim 5, characterized in that: the two blackbody sources respectively located in the normal temperature blackbody radiation zone and the temperature control blackbody radiation zone are normal temperature surface source blackbody and temperature control surface source blackbody, The distance between the scanning reflection component and the radiation exit ports of the two blackbody sources is not greater than 10mm. 7. The multi-band infrared radiation automatic measurement system according to claim 6, characterized in that: the coupling parameters of the long-wave focusing lens are consistent with the long-wave detector, and the coupling parameters of the medium-wave focusing lens are consistent with the medium-wave cooling detection device remains consistent. 8. The multi-band infrared radiation automatic measurement system according to claim 7, characterized in that: the outer surface of the protection window is coated with a diamond-like high-efficiency infrared anti-reflection coating, and the surface of the rotating mirror is coated with a silver outer reflection coating and additionally protected by a medium. 9. The multi-band infrared radiation automatic measurement system according to claim 8, wherein the long-wave detector is a pyroelectric detector, and the medium-wave cooling detector is a medium-wave HgCdTe detector. the

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