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Portable mid-infrared high-sensitivity multi-component gas measurement and analysis system and working method thereof

A high-sensitivity, gas measurement technology, applied in the field of laser measurement, can solve the problems of inability to measure broad-spectrum gas molecular spectra, low measurement sensitivity, etc., and achieve the effect of avoiding wavelength changes, high-sensitivity measurement, and easy data processing.

Active Publication Date: 2020-07-10
山东铂锐激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Photoacoustic spectroscopy can only measure narrow-spectrum gas molecules (100nm) such as acetone, propane, etc.
Fourier spectrometers can measure narrow linewidth and broad spectrum gas molecules, but the measurement sensitivity is relatively low, generally at the ppm level

Method used

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  • Portable mid-infrared high-sensitivity multi-component gas measurement and analysis system and working method thereof
  • Portable mid-infrared high-sensitivity multi-component gas measurement and analysis system and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A portable mid-infrared high-sensitivity multi-component gas measurement and analysis system, such as figure 1 As shown, it includes an optical parametric oscillator 1, an absorption cell 2 and a data processing system 7;

[0048] The light of the optical parametric oscillator 1 is divided into two paths by the beam splitter A9, and one path is respectively connected to the data processing system 7 and the digital lock-in amplifier 6 through the absorption cell 2 and the detector A3, and the digital lock-in amplifier 6 is connected to the data processing system 7 ; The other path is connected with the beam splitter B10, and is divided into two paths, and the two paths are respectively connected to the data processing system 7 through the detector B11 and the Michelson interferometer 12;

[0049] After the other optical signal is split by the beam splitter B10, it is converted into an electrical signal (for monitoring laser energy changes) by the mercury cadmium tellurid...

Embodiment 2

[0069] A portable mid-infrared high-sensitivity multi-component gas measurement and analysis system. When measuring gas methane, the data processing system 7 transmits commands to the temperature control module 4, sets the temperature at 90°C, and transmits commands to the current drive module 5 at the same time. Adjust the pump light signal of the optical parametric oscillator 1, so as to realize the change of the output laser frequency of the optical parametric oscillator 1; set the tuning frequency of the triangular wave to 10Hz, the tuning frequency of the sine wave to 10KHz, and the tuning wavelength of the laser output to 3.3um, covering the methane gas absorption line; After the laser passes through the absorption cell 2, it is converted into a photoelectric signal by the detector A3, and the sinusoidal tuning frequency signal is input to the reference signal channel of the digital lock-in amplifier, while the signal of the detector A is connected to the input channel of ...

Embodiment 3

[0071]A portable mid-infrared high-sensitivity multi-component gas measurement and analysis system. When measuring a wide molecular spectrum (spectral range > 10nm), such as gasoline volatiles, the pump wavelength 1064nm of the optical parametric oscillator 1 remains unchanged at this time, and the data processing The system 7 transmits the temperature adjustment to the temperature control module 4 at 90-200°C to realize the wide-range scanning of the optical parametric oscillator wavelength from 1.5-5um. The laser of the optical parametric oscillator 1 is divided into three paths, which pass through the Michelson interferometer respectively. 12. The detector B and the absorption cell 2, after the three-way signal is photoelectrically converted, is collected by the data processing system 7, and the obtained three-way signal is expressed as I(t, v), I(t, T), I m (t, v, T), respectively, are the real-time signal of laser frequency, the real-time signal of laser intensity and the ...

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Abstract

The invention relates to a portable mid-infrared high-sensitivity multi-component gas measurement and analysis system and a working method thereof, and belongs to the technical field of laser measurement, the portable mid-infrared high-sensitivity multi-component gas measurement and analysis system comprises an optical parametric oscillator, an absorption cell and a data processing system; light of the optical parametric oscillator is divided into two paths through a beam splitter A, one path is connected with a data processing system and a digital lock-in amplifier through an absorption celland a detector A, and the digital lock-in amplifier is connected with the data processing system; the other path is connected with a beam splitter B and is divided into two paths, and the two paths are respectively connected to a data processing system through a detector B and a Michelson interferometer; the data processing system is further connected with a current driving module and a temperature control module, and the current driving module and the temperature control module are both connected with the optical parametric oscillator. According to the system, various narrow-molecule and wide-molecule spectral substances can be detected with high sensitivity in real time.

Description

technical field [0001] The invention relates to a portable mid-infrared high-sensitivity multi-component gas measurement and analysis system and a working method thereof, belonging to the technical field of laser measurement. Background technique [0002] The main cause of my country's air pollution is due to the emission of polluting gases from industries such as industrial parks and chemical industry parks, as well as secondary pollution. These main polluting gases include organic substances such as alkanes, benzene and other inorganic substances such as hydrogen sulfide and ammonia. With the increasing supervision of national government departments, these chemical industry parks generally adopt traditional electrochemical methods as monitoring methods. However, for the leakage monitoring of some trace gases in chemical industry parks, the methods used have defects such as low sensitivity and single components. Although mass spectrometry technology can achieve high-sensi...

Claims

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Application Information

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IPC IPC(8): G01N21/39G01N21/3504G01J3/45
CPCG01J3/45G01N21/3504G01N21/39G01N2021/355
Inventor 夏金宝叶帅聂鸿坤张百涛杨克建何京良
Owner 山东铂锐激光科技有限公司
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