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Gas detection device with self-cleaning window and method

A gas detection and self-cleaning technology, applied in the field of photoelectric analysis, can solve the problem that pollutants cannot be automatically removed, achieve thorough cleaning and improve accuracy

Pending Publication Date: 2017-03-15
HESAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has disadvantages. For example, as the detection time becomes longer, dirt in the gas to be measured or zero gas will be deposited on the window, such as oil, stains and other pollutants. These pollutants cannot be removed automatically, and can only be removed through the above-mentioned manual removal of

Method used

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  • Gas detection device with self-cleaning window and method
  • Gas detection device with self-cleaning window and method
  • Gas detection device with self-cleaning window and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] figure 1 A schematic structural diagram of a gas detection device with a self-cleaning window according to an embodiment of the present invention is schematically given, as shown in figure 1 As shown, the gas detection device includes:

[0048] A tunable semiconductor laser, the laser emits light of a first wavelength and light of a second wavelength, the light of the first wavelength is selectively absorbed by the gas to be measured, and the light of the second wavelength will not be absorbed by the gas to be measured gas absorption;

[0049] There are two windows, which are respectively arranged on two opposite boundaries of the gas to be measured, to isolate the gas to be measured from the outside world;

[0050] A cleaning module, the cleaning module is used to clean the side of the window facing the gas to be measured; the cleaning module includes:

[0051] Cleaning liquid tank, the cleaning liquid tank is filled with cleaning liquid;

[0052] A first valve, th...

Embodiment 2

[0073] figure 2 A schematic structural diagram of a gas detection device with a self-cleaning window according to an embodiment of the present invention is schematically given, as shown in figure 2 Shown, different from embodiment 1 is:

[0074] 1. The light source adopts a wide-spectrum light source, and the emitted light includes the light of the first wavelength and the second wavelength at the same time;

[0075] 2. Between the window and the detector, a first optical filter and a second optical filter driven by a motor are arranged, the first optical filter only passes the light of the first wavelength, and the second optical filter only passes the light of the first wavelength Light of the second wavelength.

[0076] The gas detection method of the embodiment of the present invention, that is, the working process of the above-mentioned gas detection device, the gas detection method includes the following steps:

[0077] (A1) The broad-spectrum light source simultane...

Embodiment 3

[0086] The gas detection method of the embodiment of the present invention, the gas detection method comprises the following steps:

[0087] (A1) The broad-spectrum light source simultaneously emits light of the first wavelength and the second wavelength, the light passes through the window and the gas to be measured, and the window is set at the boundary of the gas to be measured;

[0088] (A2) The detector converts the light of the second wavelength that passes through the gas to be measured and is filtered out of the first wavelength by the second optical filter rotated into a second electrical signal, and transmits it to the judgment module;

[0089] The detector converts the light of the second wavelength that passes through the gas to be measured and is filtered by the rotating first filter into an electrical signal, thereby obtaining a first electrical signal corresponding to the light of the first wavelength, and transmitting it to the An analysis module; the analysis ...

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PUM

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Abstract

The invention provides a gas detection device with a self-cleaning window and a method. The gas detection device comprises a light source and an analysis module, the window is formed in the boundary of gas to be detected, first wavelength light emitted by the light source is absorbed by the gas to be detected, second wavelength light emitted by the light source cannot be absorbed by the gas to be detected, a cleaning module is used for cleaning the side surface of the window close to the gas to be detected, emergent light emitted by the light source is converted into a first electric signal and a second electric signal by a detector, penetrates the window and the gas to be detected and corresponds to a first wavelength and a second wavelength respectively, the first electric signal is transmitted to the analysis module, the second electric signal is transmitted to a judging module, the judging module is used for judging whether the second electric signal is smaller than a threshold value or not, the cleaning module is started if the second electric signal is smaller than the threshold value, and normal detection is performed if the second electric signal is not smaller than the threshold value. The gas detection device has the advantages of high accuracy, simple structure, low cost and the like.

Description

technical field [0001] The invention relates to photoelectric analysis, in particular to a gas detection device and method with a self-cleaning window. Background technique [0002] In the application of using absorption spectroscopy to measure the gas concentration in the flue, the optical window used to isolate the flue and the detection unit is often polluted by oil and dust in the flue. There are two traditional solutions: [0003] 1. Regularly maintain and wipe the optical window manually. This method has disadvantages, for example, it must be wiped when the pipeline stops gas, and it cannot be wiped at any time according to needs, and the polluted window seriously reduces the detection accuracy, and even makes gas detection impossible. [0004] 2. Only use zero gas (usually nitrogen) to purge the optical window. This method has disadvantages. For example, as the detection time becomes longer, dirt in the gas to be measured or zero gas will be deposited on the window,...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/15
CPCG01N21/15G01N21/31G01N2021/151G01N2021/152
Inventor 陶俊李娜孙文婷向少卿李一帆
Owner HESAI TECH CO LTD