CN204461955U - A kind of sensor of dust concentration demarcates measurer - Google Patents

Abstract

The utility model discloses a calibration gauge for a dust concentration sensor. The measuring tool uses a lens measuring tool to replace the calibration dust to detect the sensitivity of the sensor, and uses a measuring device to measure the transmittance of the light-transmitting measuring tool. In this way, the pre-selected lens measuring tool is first installed on the measuring device and measured. The light intensity and spectrum of the measuring light source of the device are adjusted to the set value, and then the light transmittance of the lens gauge under the light source is measured and set by the measuring receiver, so that after the lens gauge is installed between the light source of the calibration device and the sensor to be tested , by comparing the transmittance measured by the sensor to be tested with the transmittance measured by the measuring device, when the comparison difference is within the required range, it indicates that the sensor to be tested is qualified, otherwise it is unqualified. The measuring tool replaces the traditional fume generating device and saves the step of making marking dust on the calibration device, so that there is no need to clean the residual dust on the calibration device after the calibration is completed.

Description

Calibration gauge for dust concentration sensor

technical field

The utility model relates to a calibration gauge for a dust concentration sensor.

Background technique

At present, the determination of environmental dust concentration is usually carried out by means of optical principles, especially the scattering method and the transmission method. The range is also relatively narrow; the latter has the advantages of simple method, strong signal, and large measurement space range, but there is a problem of centering, and it is also greatly affected by the size of the dust particle size, so it can be applied to occasions where the measured space dust changes little . In actual use, affected by factors such as lens pollution, light source equipment damage, and bumps during transfer, it is necessary to calibrate the dust concentration sensor every once in a while to understand the working conditions of the dust concentration sensor in different periods , and according to the different working conditions of the dust concentration sensor, decide whether to continue to use the dust concentration sensor, or to overhaul or replace the original dust concentration sensor. However, in the prior art, the calibration of the dust concentration sensor usually adopts the method of extracting a fixed flow rate and weighing it with a balance. Inject a certain amount of dust gas to measure the detection sensitivity of the dust concentration sensor, and compare the detected sensitivity with the set sensitivity to achieve the purpose of calibrating the dust concentration sensor. However, this calibration method is affected by factors such as the displacement of the dust gas generating device, the ambient humidity, and the calibration parameters of different metering devices during the detection process. The sensitivity values calibrated for the same dust concentration sensor are different. The calibration operation of the concentration sensor is unreliable, which affects the determination of the environmental concentration. At the same time, after the dust concentration sensor is calibrated, the dust remaining in the calibration tool needs to be cleaned. During the cleaning process, it is very easy to cause dust to enter the photosensitive part of the calibration tool, further reducing the detection accuracy of the calibration tool.

Utility model content

The purpose of the utility model is to provide a calibration gauge for a dust concentration sensor, aiming at solving the problem in the prior art that the calibration of the dust concentration sensor is affected by the dust generating device and the calibration result is unreliable.

In order to achieve the above object, the technical scheme of the dust concentration sensor calibration gauge in the utility model is as follows:

Calibration gauge for dust concentration sensor, including a lens gauge used to replace the calibration dust and a measuring device for measuring the transmittance of the lens measuring tool, which is installed between the light source of the calibration tool and the sensor to be tested. The measuring device has relatively spaced measuring light sources and a measurement receiver, a sample port is provided between the measurement light source and the measurement receiver for detachable assembly of the lens gauge and is separated between the measurement light source and the measurement sensor.

A sleeve-shaped fixed seat for accommodating the lens measuring tool is fixed between the measuring light source and the measuring receiver, and the two ports of the fixing seat are respectively connected to the sending end of the measuring light source and the sampling end of the measuring receiver, and the sample port is the fixing seat The fixed socket opened on the outer periphery of the.

A support bracket is fixed on the fixing seat.

The bracket is a U-shaped frame body, the vertical walls on both sides of the bracket are fixed on the two ends of the fixing seat, and the measurement light source and the measurement receiver are fixed on the opposite sides of the vertical walls on both sides of the bracket.

The lens measuring tool is a polarized lens.

There are more than two polarizing lenses stacked and fixed on the same lens seat.

There are 3~5 polarized lenses.

The utility model uses a lens measuring tool to replace the calibration dust to detect the sensitivity of the sensor, and uses a measuring device to measure the light transmittance of the light-transmitting measuring tool, so that when in use, the pre-selected lens measuring tool is first installed on the measuring device, and the The light intensity and spectrum of the measuring light source of the measuring device are adjusted to the set value, and then the light transmittance of the lens gauge under the light source is measured and set by the measuring receiver, so that the lens gauge is installed between the light source of the calibration tool and the sensor to be tested Finally, by comparing the transmittance measured by the sensor to be tested with the transmittance measured by the measuring device, when the comparison difference is within the required range, it indicates that the sensor to be tested is qualified, otherwise it is unqualified. The lens measuring tool replaces the traditional fuming device, eliminating the step of making marking dust on the calibration tool, so that there is no need to clean the residual dust on the calibration tool after the calibration is completed. At the same time, because the light transmittance of the lens measuring tool is a fixed value, and the light transmittance of the calibration dust produced by the existing smoke-generating device is unstable due to various conditions such as temperature and humidity, so the calibration measuring tool is used It will improve the accuracy of the whole calibration process and improve the calibration results of the dust concentration sensor.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the utility model.

Detailed ways

Embodiment of the dust concentration sensor calibration measuring tool in the utility model: as shown in Figure 1, the measuring tool is mainly composed of a measuring device and a lens measuring tool 3, wherein the lens measuring tool 3 is composed of 3 to 5 standard concentration polarizing lenses, each The polarizing lenses are stacked and fixed on the same lens seat; the measuring device is composed of a bracket 5, a fixing seat 2, a measuring light source 1 and a measuring receiver 4. The bracket 5 is a U-shaped frame body with an upward opening, and the two The side vertical walls are fixed on both ends of the fixed seat 2, and the fixed seat 2 is a sleeve-shaped seat body extending along the vertical wall direction of the vertical bracket 5, and two ports with the fixed seat 2 are provided on the vertical walls on both sides of the bracket 5 Connected perforations, after the measurement light source 1 and the measurement receiver 4 are fixed on the opposite sides of the vertical walls on both sides of the bracket 5, the sending end of the measurement light source 1 and the sampling end of the measurement receiver 4 are respectively located at the two sides of the bracket 5. In the opening at the opposite end of the perforation in the side wall. The outer circumference of the fixed seat 2 is provided with a jack-type sample port, which can be inserted into the lens measuring tool 3 along the radial direction of the fixed seat 2, so that the lens measuring tool 3 is separated between the measuring light source 1 and the measuring receiver 4 .

The opposite ends of the measurement light source 1 and the measurement receiver 4 are respectively provided with connecting flanges connected with the vertical wall of the bracket 5, so that the measurement official and the measurement receiver 4 are both detachably fixed on the bracket 5 through flange connection .

When carrying out the calibration of the dust concentration sensor, the pre-selected lens measuring tool 3 is first installed on the measuring device, and the light intensity and spectrum of the measuring light source 1 of the measuring device are adjusted to the set value, and then the measurement device is measured by the measuring receiver 4. The light transmittance of the lens measuring tool 3 under the light source is fixed, and the light transmittance is formed into a linear curve by using an algorithm, and the obtained concentration value and corresponding electrical parameters are input into the calibration tool to calibrate the parameters to complete the calibration of the sensor. In this way, after the lens measuring tool 3 is installed between the light source of the calibration tooling and the sensor to be measured, by comparing the light transmittance measured by the sensor to be tested with the light transmittance measured by the measuring device, when the comparison difference is within the required range, It indicates that the sensor to be tested is qualified, otherwise it is unqualified. Therefore, the method of polarizing lens is used to calibrate the dust concentration. It only needs to use different standard scattered light sheets to complete the calibration of the dust concentration. The calibration instrument is stable and not affected by other external factors. It has high precision and does not require large tooling. The error of multiple calibrations is very small, and the following items should be paid attention to in specific operations:

1. It is necessary to add a certain correction factor to use standard density polarized lenses for calibration, so that the accuracy of the instrument will be more accurate in actual measurement;

2. Polarized lenses with standard concentration will be worn to a certain extent during use, which will cause deviations in the concentration value of polarized lenses. It is necessary to regularly review whether the concentration value of polarized lenses with standard concentration is accurate.

In the above-mentioned embodiments, the inner hole of the fixing seat forms an optical path channel connecting the emitting end of the measuring light source and the sampling end of the measuring receiver. In other embodiments, the lens gauge can also be installed between the measuring light source and the measuring receiver. Open space for light transmittance testing.

In the above-mentioned embodiments, the lens measuring tool is detachably assembled on the measuring device by means of plug-in, and in other embodiments, the lens measuring tool can also be realized on the measuring device by buckle connection, binding connection, etc. detachable assembly.

Claims (7)

1. sensor of dust concentration demarcates measurer, it is characterized in that, comprise and demarcate the Lens measure of dust and the determinator for measuring Lens measure penetrability for being assemblied in substituting between light source and sensor to be measured of demarcating frock, determinator have the mensuration light source of relative spacing and measure receiver, measuring between light source and mensuration receiver and be provided with for the removable plug-in mounting of Lens measure every being located at the sample port measured between light source and determination sensor.

2. sensor of dust concentration according to claim 1 demarcates measurer, it is characterized in that, measure light source and measure the holder being fixed with the sleeve-shaped for holding Lens measure between receiver, the two-port of holder is connected to the issuing side measuring light source and the sampling end measuring receiver, and described sample port is the fixing socket that the periphery of holder is offered.

3. sensor of dust concentration according to claim 2 demarcates measurer, and it is characterized in that, on holder, bracketing is fixed with bracket.

4. sensor of dust concentration according to claim 3 demarcates measurer, and it is characterized in that, bracket is U-shaped support body, and the both sides wall of bracket is fixed on the two ends of holder, measures light source and measures the phase dorsal part that receiver is fixed on the both sides wall of bracket.

5. sensor of dust concentration as claimed in any of claims 1 to 4 demarcates measurer, and it is characterized in that, Lens measure is polarized lenses.

6. sensor of dust concentration according to claim 5 demarcates measurer, it is characterized in that, polarized lenses has two or more and folded establishing is fixed on same eyeglass seat.

7. sensor of dust concentration according to claim 6 demarcates measurer, and it is characterized in that, polarized lenses is 3 ~ 5.