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Method and device for measuring trace gas concentration with diffuse reflection integral cavity as photoacoustic cell

A trace gas and diffuse reflection technology, applied in the field of photoacoustic spectroscopy and diffuse reflection integrating cavity, can solve the problem of low utilization rate of light energy of photoacoustic pool, achieve low price, improve sensitivity, and simple maintenance

Active Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of low utilization rate of light energy of traditional photoacoustic cell when photoacoustic spectroscopy is used to detect gas, and now provides a method and device for measuring trace gas concentration using a diffuse reflection integrating cavity as a photoacoustic cell

Method used

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  • Method and device for measuring trace gas concentration with diffuse reflection integral cavity as photoacoustic cell
  • Method and device for measuring trace gas concentration with diffuse reflection integral cavity as photoacoustic cell
  • Method and device for measuring trace gas concentration with diffuse reflection integral cavity as photoacoustic cell

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specific Embodiment approach 1

[0041] Specific implementation mode one: refer to figure 1 This embodiment is described in detail. The method for measuring the concentration of trace gases using a diffuse reflection integrating cavity as a photoacoustic cell described in this embodiment is implemented based on the following device, which includes: a sawtooth wave signal generator 1 , sine wave signal generator 2, coupler 3, current controller 4, temperature controller 5, tunable diode laser 6, wedge-shaped glass sheet 7, diffuse reflection rectangular cavity 8 and signal conversion device 11;

[0042] The sawtooth signal output end of the sawtooth signal generator 1 is connected to the sawtooth signal input end of the coupler 3,

[0043] The sine wave signal output end of the sine wave signal generator 2 is connected to the sine wave signal input end of the coupler 3,

[0044] The coupled signal output end of the coupler 3 is connected to the coupled signal input end of the current controller 4,

[0045] T...

specific Embodiment approach 2

[0060] Specific embodiment 2: This embodiment is a further description of the method of using a diffuse reflection integrating cavity as a photoacoustic cell to measure the concentration of trace gases described in specific embodiment 1. In this embodiment, the signal conversion device 11 is a microphone or a quartz tuning fork.

specific Embodiment approach 3

[0061] Specific embodiment three: This embodiment is to further explain the method of using a diffuse reflection integrating cavity as a photoacoustic cell to measure the concentration of trace gases described in specific embodiment one. In this embodiment, the inner wall of the diffuse reflection rectangular cavity 8 It is coated with a paint with high diffuse reflectance from the visible wave band to the middle and outer wave bands, and the diffuse reflectance of the high diffuse reflectance paint is between 98% and 99.6%.

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Abstract

The invention discloses a method and device for measuring the trace gas concentration with a diffuse reflection integral cavity as the photoacoustic cell, and belongs to the technical field of the photoacoustic spectroscopy and the diffuse reflection integral cavity application. The problem that when gas is detected through the photoacoustic spectroscopy, the luminous energy utilization rate of a traditional photoacoustic cell is low is solved. By means of the method and device, on the basis of inheriting the advantages of the traditional photoacoustic spectroscopy, by applying the diffuse reflection integral cavity simple in production process and low in price to the photoacoustic spectrometry trace gas detection and lengthening the optical path, the sensitivity of gas measurement is improved, the utilization rate of luminous energy is increased, the cost of a gas concentration measuring system is reduced, and the method and device have the advantages of being high in response speed, high in stability, easy to maintain, capable of conducting real-time monitoring and the like. Low-concentration gas can be monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of photoacoustic spectroscopy and the application of a diffuse reflection integrating cavity, and in particular relates to a method and a device for measuring trace gas concentration by using a diffuse reflection integrating cavity as a photoacoustic cell. Background technique [0002] The real-time monitoring of gas concentration has very important applications in industrial production, environmental monitoring and other fields. For example, a large amount of NO will be produced in the process of coal combustion, which will cause great harm to the environment and human body. Therefore, NH is often introduced into the flue in industry. 3 , making it react with NO to generate N 2 and H 2 O, to achieve the purpose of eliminating NO. However NH 3 The cost is high, excess will lead to waste, and insufficient will lead to incomplete NO filtration, so the NH 3 Accurate measurement of concentration is particula...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/31G01N21/03
Inventor 张治国周雪虞佳高强秦峰郑仰东
Owner HARBIN INST OF TECH