Colorimetric ammonia gas detector and method based on screen light source

A technology of colorimetry and detectors, which is applied in the field of colorimetric ammonia gas detectors based on screen light sources, can solve problems such as high development costs, high technical difficulty, and complex optical path system design, so as to improve detection sensitivity and reduce complexity. The effect of reducing plane consistency error and inter-frame random error

Inactive Publication Date: 2020-06-05
陕西工业职业技术学院
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  • Abstract
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AI Technical Summary

Problems solved by technology

For optical sensors, optical sensors based on the photon absorption effect of gas molecules can reflect and output the optical absorption characteristics of gas molecules with a wide spectrum, high signal dimension, strong specifici

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0055] Example 1

[0056] A colorimetric ammonia gas detector based on screen light source, such as figure 1 , figure 2 , image 3 as well as Figure 4 As shown, it includes a housing 1, a back cover 2, a detection chamber 3, a detection chamber back cover 4, a suction pipe 7, a vacuum pump 8, an exhaust pipe 9, a light-emitting screen drive circuit board 10, a light-emitting screen 11, and a sensitive film array 12 , Camera 13, detection circuit board 14, and display screen 15.

[0057] Such as figure 1 with figure 2 As shown, the upper part of the housing 1 is provided with a mounting panel 16, the bottom surface of the vacuum pump 8 is connected with the upper surface of the mounting panel 16, the lower surface of the mounting panel 16 is connected with the upper surface of the camera 13, and the lens end face of the camera 13 is close to the detection cavity 3, the upper wall of the detection cavity 3 has a shooting hole in the coverage area of ​​the lens end face of the camera

Example Embodiment

[0075] Example 2

[0076] A method for using a colorimetric ammonia gas detector based on a screen light source includes an instrument calibration method and a method for detecting ammonia gas.

[0077] A method for using a colorimetric ammonia gas detector based on a screen light source includes the following steps:

[0078] (1) Instrument calibration

[0079] Determine the light source screen illumination color of each sensitive film on the sensitive film array through color matching experiments, so that under the illumination of the light source screen illumination color, measure the gradation values ​​of the red, green, and blue three color components of the average color of the sensitive film The sum is the smallest.

[0080] Through a specific concentration of ammonia detection experiment, the least squares method is used to fit the adsorption isotherm model between the ammonia concentration at 25 ℃ and the normalized color change of the sensitive film, and on the basis of this mode

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PUM

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Abstract

The invention discloses a colorimetric ammonia gas detector based on a screen light source. The colorimetric ammonia gas detector comprises a shell, a rear cover, a detection cavity, a detection cavity rear cover, an exhaust pipe, a vacuum pump, an exhaust pipe, a light-emitting driving circuit board, a light-emitting screen, a sensitive film array, a camera, a detection circuit board, a display screen and the like. The instrument detects the gas by utilizing the color change caused by the change of the absorption spectrum after the sensitive film adsorbs ammonia gas molecules; through screencolor control, a transmission type illumination light source with the spectrumshape close to that of a sensitive film absorption spectrum is generated, so that slight change of the sensitive film absorption spectrum can cause large film color change, and the ammonia gas detection sensitivity is remarkably improved. The invention further discloses a use method of the colorimetric ammonia gas detector based on the screen light source, the complexity of an optical system and a detection circuit is reduced by adopting a colorimetric measurement method, the signal dimension is improved, the test performance is stable, and the colorimetric ammonia gas detector has very high gas resolution.

Description

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Claims

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Application Information

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Owner 陕西工业职业技术学院
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