CN201166604Y - A measurement system for the spectral angular reflectance characteristics of a fiber-optic transmission diffuse reflector - Google Patents

Abstract

The utility model relates to an optical fiber transmission type diffuse reflection plate spectral angle reflection characteristic measurement system, which comprises a collimated light source placed horizontally; the first turntable is installed on the test platform, the second turntable is fixed on the first turntable, and the third turntable Installed on the second turntable; the sample holder is composed of a support rod and a sample mounting plate, one end of the support rod is fixed on the third turntable, and the other end is fixed on the sample mounting plate; a condenser lens is fixed in the lens barrel; one end of the fiber bundle is placed on the The focusing lens is at the focal point, and the other end is placed at the incident slit of the monochromator; the monochromator is placed on the test platform and controlled by a computer; the measurement signal is received by a photodetector. Through the wavelength scanning of the monochromator, the spectral curve of the light reflected by the diffuse reflection plate at a certain incident angle can be obtained. Through the orderly rotation of the first turntable and the second turntable, the measurement of the reflective spectrum intensity of the diffuse reflector at different incident angles is completed, and after processing, it becomes the angular reflectance characteristic value of the diffuse reflector.

Description

A measurement system for the spectral angular reflectance characteristics of a fiber-optic transmission diffuse reflector

technical field

The utility model relates to the field of radiation calibration of spectroscopic instruments, in particular to a measurement system for spectral angle reflection characteristics of diffuse reflection plates used for on-board calibration of space spectroscopic instruments.

Background technique

Diffuse reflector is an important optical element in radiometric calibration of spectroscopic instruments. Especially in the ultraviolet and visible bands on satellites, diffuse reflectors are often used to introduce stable light sources, such as sunlight, into the optical path of spectrometers to calibrate the spectrometers, monitor changes in spectrometers, and use them to calibrate measurement results. . Considering the movement of the sun on the ecliptic throughout the year, the irradiation angle of sunlight on the diffuse reflector on the star is constantly changing. Therefore, the measurement of the spectral angular reflection characteristics of the diffuse reflector is to calibrate the spaceborne instruments in the ultraviolet and visible bands. important aspect.

The current measuring devices for spectral angular reflectance characteristics of diffuse reflectors can be divided into two categories:

One is to turn the light source into parallel light and directly illuminate the diffuse reflection plate installed on the two-dimensional turntable, use a detector with an interference filter to measure the reflected light of the diffuse reflection plate, and turn the two-dimensional turntable to obtain Obtains the angular reflectance characteristics of the diffuse reflector at the wavelengths transmitted by the interference filter. The advantage of this device is that the structure is simple and the influence of stray light is small; the disadvantage is that the measurement wavelength is limited by the transmission center wavelength of the interference filter, and it can only measure the angular reflection characteristics of a single spectral wavelength diffuse reflection plate each time. Even with multiple detectors, only a few discrete wavelengths can be measured, and this adds weight to the rotating parts, complicating the measurement system.

In order to overcome the above shortcomings and make the measurement system obtain the angular reflectance characteristics of the diffuse reflector in a wide spectral range, another type of diffuse reflector spectral angular reflectance measurement device currently used is to focus the light emitted by the continuous light source into the On the incident slit of the monochromator, the monochromator splits the light emitted by the continuous light source, and the output from the exit slit of the monochromator is the monochromatic light with the required spectral resolution. The monochromatic light passes through the collimated optical components After collimation, it becomes parallel light and irradiates the diffuse reflector to be tested installed on the two-dimensional turntable, and the angular reflection characteristics of the diffuse reflector at the output wavelength of the monochromator can be obtained by the same rotation of the two-dimensional turntable. Scanning the dispersion element of the monochromator can change the output wavelength of the monochromator, so that the spectral angular reflection characteristics of the diffuse reflection plate within the designed spectral range can be obtained. (References: E.Renotte, A.Novi, D.Labate, M.Melozzi, C.Giunti, R.Meynart, "Solar diffuser pre-flight calibration set-up" SPIE 1997, vol.2957, 355-372 Fig.3) The advantage of this device is that it overcomes the disadvantage that the above-mentioned optical filter device can only measure a single wavelength, and can obtain the angular reflection characteristics of different wavelengths in a wide spectral range. The disadvantage is that the light source has become very weak after light splitting, multiple reflections and refraction, and the stray light irradiated on the diffuse reflection plate must be strictly controlled. This increases the complexity of the system; otherwise, due to the interference of external stray light, the measurement accuracy will be greatly reduced.

Contents of the invention

The purpose of the utility model is: to solve the problem of measuring the spectral angle reflection characteristics of the diffuse reflector in the prior art, the interference filter method can only be used for single-wavelength measurement, and solve the problem of stray light interference using the monochromator spectroscopic method To solve the problem, a fiber-optic transmission-type diffuse reflector spectral angular reflectance measurement system consisting of a collimated light source, a sample holder, a rotating part, a light-condensing part, a monochromator and a photodetector is provided.

The purpose of this utility model is achieved in that:

The utility model provides an optical fiber transmission type diffuse reflection plate spectral angle reflection characteristic measurement system, including a collimated light source for generating parallel light beams, a sample holder, a rotating part, a light concentrating part 6 for receiving scattered light, and a monochromator 8 and photodetector 9; It is characterized in that it also includes support rod 4, sample mounting plate 5, optical fiber bundle 7 and mounting plate 10; Wherein,

Described collimating light source is made up of collimating mirror 2-1, deuterium lamp 2-2 and deuterium lamp power supply 2-3, and described deuterium lamp 2-2 is arranged on the opposite side of the diffuse reflector to be measured on the sample holder; Wherein said deuterium lamp 2-2 is electrically connected with said deuterium lamp power supply 2-3, and said collimating mirror 2-1 is arranged on the light path output by said deuterium lamp 2-2; Place it on the test platform 11, and its center height is consistent with the center height of the diffuse reflection plate to be tested, so as to ensure that the diffuse reflection plate to be tested is in the center of the parallel light beam emitted by the collimated light source; the optical axis of the collimated light source is perpendicular to the rotation axis of the first turntable 1 and the plane formed by the rotation axis of the second turntable 2; during the measurement process, the direction of the output light of the collimated light source remains fixed;

The sample holder is composed of a support rod 4 and a sample mounting plate 5, wherein the support rod 4 is a cylinder, and one end is fixed at the central rotating shaft of the third turntable 3, and the rotating shaft of the third turntable 3 passes through the center line of the support rod 4 The other end of the support rod 4 fixes a sample mounting plate 5 for installing the diffuse reflection plate to be measured; the design of the sample holder should ensure that the rotating shaft of the third turntable passes through the front surface of the diffuse reflection plate to be measured, and the first turntable rotating shaft The intersection point with the rotation axis of the second turntable is at the center position of the front surface of the diffuse reflection plate to be measured;

The rotating part is composed of a first turntable 1 for realizing the one-dimensional rotation of the diffuse reflection plate to be measured relative to the parallel irradiation light beam from the collimated light source, and a first turntable 1 for realizing the parallel irradiation of the diffuse reflection plate to be measured relative to the collimated light source. The second turntable 2 that rotates in another dimension of the light beam is composed of a third turntable 3 for setting the reflection angle of the diffuse reflection plate to be tested; wherein, the first turntable 1 is a TS160A manual turntable installed in the test On the platform; the second turntable 2 adopts the RSA100 type electric turntable, driven by a stepper motor, the second turntable 2 is fixed on the first turntable 1 through the mounting plate 10, and the rotating shaft of the second turntable 2 is perpendicular to the first turntable the rotating shaft of the turntable 1; the third turntable 3 is installed on the second turntable 2, and its rotating shaft is coaxial with the rotating shaft of the second turntable 2;

The condensing part 6 is composed of a condensing lens and a lens barrel, the lens barrel is cylindrical, and a condensing lens is fixed at one end of the lens barrel near the sample mounting plate 5, and the condensing lens is a JGS1 quartz lens; The light concentrating part 6 is fixed on the second turntable 2 and is driven to rotate by the second turntable 2. The optical axis of the light concentrating part 6 passes through the center of the front surface of the diffuse reflection plate to be measured and is perpendicular to the rotation axis of the second turntable 2;

Described optical fiber bundle 7 is made up of 50-60 quartz optical fibers, and one end of this optical fiber bundle 7 circles is placed in the lens tube of condensing part 6, and at the focal point of the condensing lens, the other end of optical fiber bundle 7 rectangles is placed in the single The incident slit of the colorimeter 8, close to the incident slit of the monochromator 8;

Described monochromator 8 is controlled by computer, is placed on the test platform, and described photodetector 9 adopts R928 photomultiplier tube, is placed behind the exit slit of monochromator 8, close to the exit slit, and Fixed on the monochromator 8; the optical fiber bundle 7 transmits the light radiation received by the diffuse reflection plate to be measured to the incident slit of the monochromator 8, and the light radiation arriving at the incident slit is split by the monochromator 8 , is received by the photodetector 9 and converted into an electrical signal, and the spectral curve of the light reflected by the diffuse reflection plate at a certain incident angle can be obtained through the wavelength scanning of the monochromator. Through the orderly rotation of the first turntable and the second turntable, the measurement of the spectrum reflected light intensity at different incident angles of the diffuse reflection plate is completed. These measured values are processed into the corner reflection characteristic values of the diffuse reflector.

In the above-mentioned technical solution, in order to reduce the weight of the rotating parts, the aperture of the condenser lens should be selected as small as possible, but also enable the photodetector to receive an appropriate signal strength to ensure that the detection signal has an appropriate signal-to-noise ratio. The condensing lens is a JGS1 quartz lens, and the focal length of the condensing lens is generally selected so that the measurement field of view of the reflected light of the diffuse reflection plate to be measured is less than 1°, so as to ensure that the measurement system has sufficient angular resolution or according to the actual situation of use select.

In the above technical solution, the diameter of each optical fiber in the optical fiber bundle (7) is φ0.2mm; one end of the optical fiber bundle 7 is a circle with a diameter of φ1.7mm; the other end is 0.76mm×3mm rectangle.

In the above technical solution, the monochromator 8 adopts the TRAIX320 monochromator produced by JY Company of France, the focal length is 320mm, the grating line is 1200g/mm, and the working wavelength range of the monochromator is 200-1500nm.

In the above technical solution, the collimating mirror 2-1 adopts a JGS1 quartz lens with a maximum diameter of 100mm and a focal length of 250mm.

In the above technical solution, the deuterium lamp 2-2 adopts the LD2000 deuterium lamp produced by Japan Hamsong Company.

In the above technical solution, the deuterium lamp power supply 2-3 adopts the LD2000 deuterium lamp supporting power supply produced by Japan Hamsong Company.

In the above technical solution, the photodetector 9 adopts R928 photomultiplier tube.

Positive effects of the present utility model: the present utility model directly irradiates the diffuse reflection plate with an unsplit collimated light source, the light radiation irradiated on the diffuse reflection plate is not attenuated by the monochromator, and the light radiation irradiated on the diffuse reflection plate is stronger, The influence of stray light on the measurement results is reduced; and the optical fiber coupling is used, so that the monochromator and the detector are placed on the test bench during the test, and only one end of the fiber bundle rotates with the turntable, which reduces the weight of the rotating parts , making the rotating device small and light. This system not only realizes the measurement of spectral angular reflection characteristics, reduces the influence of stray light on the measurement results, but also because the photodetector does not need to rotate, compared with the interference filter measurement system that can only measure a single wavelength , the system is also lighter.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

Fig. 1 composition schematic diagram of the utility model measuring system

Figure 2 is a schematic diagram of the composition of the collimated light source in the measurement system of the utility model

1----First turntable 2----Second turntable 3----Third turntable

4----Support Rod 5----Sample Mounting Plate 6----Concentrating Part

7----Optical fiber bundle 8----Monochromator 9----Photodetector

10---mounting board 11----test platform 2-1----collimating mirror

2-2----deuterium lamp 2-3 deuterium lamp power supply

Detailed ways

The utility model is shown in Figure 1 and Figure 2. The system consists of a two-dimensional rotating part, a sample holder, a light collecting part 6, an optical fiber bundle 7, a monochromator 8, a photoelectric detector 9, a mounting plate 10 and a collimated light source. The two-dimensional rotating system includes a first turntable 1 , a second turntable 2 and a third turntable 3 . The sample holder consists of a support rod 4 and a sample mounting plate 5 . The collimated light source is located in the vertical drawing direction of Fig. 1 and is not drawn in Fig. 1; its composition is shown in Fig. 2, including collimating mirror 2-1, deuterium lamp 2-2 and deuterium lamp power supply 2-3.

The two-dimensional rotating part is used to realize the two-dimensional rotation of the diffuse reflection plate to be tested relative to the parallel irradiation light beam from the collimated light source and the setting of the reflection angle of the diffuse reflection plate to be tested. Among them, the first turntable 1 adopts TS160A manual turntable, the indexing error is better than 2′, it is installed on the test platform, and it is used to realize the one-dimensional rotation of the diffuse reflector to be tested relative to the parallel irradiation beam from the collimated light source, that is, the incident angle is at Changes in the direction of the α angle.

The second turntable 2 adopts the RSA100 type electric turntable, which is driven by a subdivided stepping motor, and the indexing error is better than 5'. The second turntable 2 is fixed on the first turntable 1 through the mounting plate, so that the second turntable 2 can rotate around the first turntable 1 axis of rotation, and the axis of rotation of the second turntable 2 is perpendicular to the axis of rotation of the first turntable 1 . Through the rotation of the second turntable 2, another dimension rotation of the diffuse reflection plate to be tested relative to the parallel irradiation light beam from the collimated light source is realized, that is, the change of the incident angle in the direction of β angle.

The third turntable 3 is installed on the second turntable 2, and its rotation axis is coaxial with the rotation axis of the second turntable 2, driven by the second turntable 2 to rotate, for setting the reflection angle of the diffuse reflection plate to be tested. The third turntable does not rotate during the measurement process, and keeps the reflection angle of the diffuse reflection plate to be measured constant during the measurement process.

The support rod 4 is a cylindrical rod, one end of which is fixed on the third turntable 3, and the axis of the support rod 4 passes through the rotating shaft of the third turntable 3; the other end of the support rod 4 is used to fix the sample mounting plate 5, and the sample The mounting plate 5 is used for mounting the diffuse reflector to be tested. The design of the support rod 4 and the sample mounting plate 5 ensures that the rotation axis of the third turntable 3 is located on the front surface of the diffuse reflection plate to be tested, and the intersection point of the rotation axis of the first turntable 1 and the second turntable 2 is at the center of the front surface of the diffuse reflection plate to be measured Location.

The light concentrating component 6 for receiving scattered light is fixed on the second turntable 2 and is driven to rotate by the second turntable 2 . The condensing component 6 is composed of a condensing lens and a lens barrel. The optical axis of the condensing lens passes through the center of the front surface of the diffuse reflection plate to be tested and is perpendicular to the rotation axis of the second turntable 2 . The lens barrel of the condensing part 6 is a cylinder, and a condensing lens is fixed at one end of the lens barrel close to the sample mounting plate 5, and the condensing lens is a JGS1 quartz lens. The condenser lens is used to converge the reflected light of the diffuse reflection plate to be tested. In order to reduce the weight of the rotating parts, the aperture of the lens should be selected as small as possible, but the photodetector 9 can receive an appropriate signal strength to ensure that the detection signal has an appropriate intensity. Signal-to-noise ratio, in this example the aperture of the lens is taken as φ25mm. The focal length of the lens is generally selected so that the measurement field of view of the reflected light of the diffuse reflector to be tested is less than 1°, so as to ensure that the measurement system has sufficient angular resolution, and it can also be selected according to the actual use situation. In this example, the focal length of the lens is taken as 100mm.

The optical fiber bundle 7 of the present embodiment, for example, is φ0.2mm by the diameter of each optical fiber, is made up of 60, 55 or 50 quartz optical fibers in total, and one end of the optical fiber bundle 7 is a diameter φ1.7mm It is round, and the other end is a rectangle of 0.76mm×3mm. The round end of the optical fiber bundle 7 is placed in the lens barrel of the condensing component 6 at the focal point of the condensing lens for receiving the reflected light of the diffuse reflection plate to be tested focused by the condensing lens. The other end of the rectangular fiber bundle 7 is placed at the incident slit of the monochromator 8 and is close to the incident slit of the monochromator 8 . The optical fiber bundle 7 transmits the light radiation reflected by the diffuse reflection plate to be measured to the incident slit of the monochromator 8, and the light radiation arriving at the incident slit is received by the photodetector 9 and converted into electrical energy after being split by the monochromator 8. Signal.

The monochromator 8 adopts the TRAIX320 monochromator produced by JY Company in France, the focal length is 320mm, the grating line is 1200g/mm, and the working wavelength range of the monochromator is 200-1500nm. The monochromator is controlled by a computer for automatic measurement and placed on the test platform. The spectral resolution chosen for the measurement is about 2nm.

The photodetector 9 is placed behind the exit slit of the monochromator 8, close to the exit slit, and fixed on the monochromator 8; the photodetector 9 adopts an R928 photomultiplier tube and uses photon counting method for measurement.

A collimated light source used to generate parallel light beams is placed horizontally on the test platform 11, and its center height is consistent with the center height of the diffuse reflection plate to be tested, so as to ensure that the diffuse reflection plate to be tested is in the center of the parallel light beam emitted by the collimated light source; The optical axis of the light source is perpendicular to the plane formed by the rotation axis of the first turntable 1 and the rotation axis of the second turntable 2 . During the measurement process, the output light direction of the collimated light source remains fixed; the collimated light source includes a collimating mirror 2-1, a deuterium lamp 2-2 and a deuterium lamp power supply 2-3. The deuterium lamp 2-2 is ignited by the deuterium lamp power supply 2-3, and the emission beam of the deuterium lamp 2-2 becomes a parallel beam after being collimated by the collimating mirror 2-1. The collimating mirror 2-1 adopts JGS1 quartz lens, the maximum aperture is 100mm, and the focal length is 250mm; the deuterium lamp 2-2 adopts the LD2000 deuterium lamp produced by Japan Hamasong Company. The light source has good stability, and the drift of its radiation intensity Less than 0.5%/hour; deuterium lamp power supply 2-3 adopts LD2000 deuterium lamp supporting power supply produced by Japan Hamsong Company.

During measurement, the diffuse reflector to be measured is first installed on the sample mounting plate 5 . Turn the third turntable 3 to adjust the reflection angle to make it reach the required reflection angle (eg 40°), and lock the third turntable 3 after adjustment to ensure that the reflection angle remains unchanged during the measurement. Place the collimated light source shown in Figure 2 perpendicular to the direction of the paper in Figure 1, and align it with the diffuse reflector to be tested. Turn the first turntable 1 and the second turntable 2 so that the incident angle is 0°.

Turn on the deuterium lamp power supply 2-3, and light the deuterium lamp 2-2. The light radiation of the deuterium lamp 2-2 is collimated by the collimating mirror 2-1 and becomes a parallel beam, which is irradiated on the diffuse reflector to be tested installed on the sample mounting plate 5 . The reflected light beam of the diffuse reflection plate to be measured is focused onto an end face of the fiber bundle 7 through the condenser lens of the light-collecting part 6, and the fiber bundle 7 transmits the reflected light beam of the diffuse reflection plate to be measured to the incident slit of the monochromator 8, After being split by the monochromator, it is received by the photodetector 9, and the photodetector 9 converts the optical signal into an electrical signal for measurement. By scanning the wavelength of the monochromator 8, the incident angle can be obtained as 0° (α=0°, β=0°), a spectral curve of the reflected light of the diffuse reflector to be tested. By rotating the first turntable 1 and the second turntable 2, the curves of the reflected light intensity of the reflected light spectrum of the diffuse reflection plate to be measured at different incident angles (α, β) can be obtained. After these measured values are normalized, the spectral angular reflectance characteristics of the diffuse reflector to be tested can be given.

It is verified by experiments that the system can meet the design requirements for the measurement of spectral angular reflection characteristics of diffuse reflectors used for on-board calibration of space spectroscopic instruments. In another embodiment, after a 150W xenon lamp light source is used, the measurement wavelength range can be extended to visible and near-infrared bands.

Of course, the utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the utility model without departing from the spirit and essence of the utility model, but These corresponding changes and deformations should all belong to the protection scope of the appended claims of the present utility model.

Claims (8)

1. An optical fiber transmission type diffuse reflection plate spectrum angle reflection characteristic measuring system comprises a collimation light source, a sample frame, a rotating part, a light-gathering part (6), a monochromator (8) and a photoelectric detector (9); the device is characterized by also comprising a support rod (4), a sample mounting plate (5), an optical fiber bundle (7) and a mounting plate (10);

the collimation light source consists of a collimation lens (2-1), a deuterium lamp (2-2) and a deuterium lamp power supply (2-3); wherein the deuterium lamp (2-2) is electrically connected with the deuterium lamp power supply (2-3), and the collimating mirror (2-1) is arranged on the light path output by the deuterium lamp (2-2);

the sample rack consists of a supporting rod (4) and a sample mounting plate (5) for mounting the diffuse reflection plate to be tested, wherein the supporting rod (4) is a cylinder, one end of the supporting rod (4) is fixed on the third rotary table (3), and the axis of the supporting rod (4) passes through the rotating shaft of the third rotary table (3); the other end of the supporting rod (4) is fixed with the sample mounting plate (5);

the two-dimensional rotating component is composed of a first rotating platform (1) for realizing one-dimensional rotation of the diffuse reflection plate to be measured relative to the parallel irradiation light beam from the collimated light source, a second rotating platform (2) for realizing rotation of the diffuse reflection plate to be measured relative to the other dimension of the parallel irradiation light beam from the collimated light source, and a third rotating platform (3) for setting the reflection angle of the diffuse reflection plate to be measured; the first rotary table (1) adopts a TS160A manual rotary table and is arranged on a test platform; the second rotary table (2) adopts an RSA100 type electric rotary table and is driven by a stepping motor, the second rotary table (2) is fixed on the first rotary table (1) through a mounting plate (10), so that a rotating shaft of the second rotary table (2) is perpendicular to a rotating shaft of the first rotary table (1) and is driven to rotate by the first rotary table (1); the third rotary table (3) is arranged on the second rotary table (2), and the rotating shaft of the third rotary table (3) is coaxial with the rotating shaft of the second rotary table (2) and is driven to rotate by the second rotary table (2);

the light-focusing component (6) consists of a light-focusing lens and a lens barrel, wherein the lens barrel is a cylinder, and the light-focusing lens is fixed at one end of the interior of the lens barrel, which is close to the sample mounting plate (5); the light-gathering component (6) is fixed on the second rotary table (2) and is driven by the second rotary table (2) to rotate, and the optical axis of the light-gathering component (6) passes through the center of the front surface of the diffuse reflection plate to be detected and is vertical to the rotating shaft of the second rotary table (2);

the optical fiber bundle (7) consists of 50-60 quartz optical fibers, one end of the optical fiber bundle (7) is placed at the focus of the condensing lens in the lens barrel, and the other end of the optical fiber bundle (7) is placed at the entrance slit of the monochromator (8) and clings to the entrance slit of the monochromator (8);

the monochromator (8) is controlled by a computer and is arranged on the test platform, and the photoelectric detector (9) is arranged behind the emergent slit of the monochromator (8), is tightly attached to the emergent slit and is fixed on the monochromator (8).

2. The system for measuring the spectral angular reflectance of a fiber-optic-transmission-type diffuse reflection plate according to claim 1, wherein one end of the fiber bundle (7) is circular with a diameter of 1.7 mm; the other end is a rectangle of 0.76mm x3 mm.

3. The system for measuring the spectral angular reflectance of a diffusely reflecting plate transmitted by optical fiber according to claim 1, wherein said monochromator (8) is a TRAIX320 monochromator manufactured by JY, france, with a focal length of 320mm, a grating groove of 1200g/mm, and a wavelength range of 200-1500 nm.

4. The system for measuring the spectral angular reflectance of a diffusely reflecting plate using optical fiber transmission according to claim 1, wherein said collimating mirror (2-1) is a JGS1 quartz lens having a maximum aperture of 100mm and a focal length of 250mm.

5. The system for measuring the spectral angular reflectance of a diffusely reflecting plate using optical fiber transmission according to claim 1, wherein the condenser lens is a JGS1 quartz lens and the focal length of the condenser lens is selected such that the field of view of the light reflected by the diffusely reflecting plate to be measured is less than 1 °.

6. The system for measuring the spectral angular reflection characteristic of the optical fiber transmission diffuse reflection plate according to claim 1, wherein the deuterium lamp (2-2) is an LD2000 deuterium lamp manufactured by rime of japan.

7. The system for measuring the spectral angular reflection characteristic of the optical fiber transmission diffuse reflection plate according to claim 1, wherein the deuterium lamp power supply (2-3) is a power supply matched with an LD2000 deuterium lamp produced by rime of Japan.

8. The system for measuring the spectral angular reflectance of a diffusely reflecting plate transmitted over an optical fiber as claimed in claim 1, wherein said photodetector (9) comprises an R928 photomultiplier tube.

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