Double-spectrum gas detection device and method based on quartz tuning forks

A quartz tuning fork and gas detection technology, which is applied in measuring devices, color/spectral characteristic measurement, and material analysis through optical means, can solve problems that have not been discovered, and achieve the effect of wide concentration detection range, low cost, and compact system

Active Publication Date: 2019-07-23
ANHUI UNIVERSITY
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  • Double-spectrum gas detection device and method based on quartz tuning forks
  • Double-spectrum gas detection device and method based on quartz tuning forks
  • Double-spectrum gas detection device and method based on quartz tuning forks

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments.

[0026] Examples.

[0027] Such as figure 1 As shown, a dual-spectrum detection device based on a quartz tuning fork includes a wavelength tunable laser 1, a focusing collimator lens 2, a square aperture with adjustable aperture 3, a sample cell 4, a transparent window 5, a first tuning fork 6, Air inlet 7-1, air outlet 7-2, second tuning fork 8, first preamplifier circuit 9 and second preamplifier circuit 10, laser control module 11, analog to digital conversion module 12-1, digital to analog conversion Module 12-2, computer control unit 13; the signal output end of the computer control unit 13 is connected to the digital-to-analog conversion module ...

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Abstract

The invention discloses a double-spectrum gas detection device and method based on quartz tuning forks. The double-spectrum gas detection device is characterized by comprising a wavelength tunable laser, a focusing collimating lens, an aperture adjustable diaphragm, a sample cell, a light inlet window piece, a first tuning fork, a gas inlet and outlet, a second tuning fork, a first preamplifier circuit, a second preamplifier circuit, a laser control module, an analog to digital conversion module, a digital to analog conversion module, and a computer control unit. According to the double-spectrum gas detection device disclosed by the invention, the quartz tuning forks are used as an optical signal detector and an acoustic signal detector at the same time due to the resonance characteristicsand the piezoelectric effect of the quartz tuning forks, a double-spectrum technique for simultaneously obtaining a direct absorption spectrum signal and a photoacoustic spectrum signal, correction is provided for the photoacoustic spectrum through the gas concentration information inverted from the direct absorption spectrum signal, the corrected photoacoustic spectrum and the direct absorptionspectrum are respectively applied to low concentration and high concentration sample analysis, and the laser light intensity can be fully utilized to achieve gas concentration measurement of a wide dynamic range.

Description

Technical field [0001] The invention relates to the technical field of photoelectric or spectroscopy, in particular to a dual-spectrum gas detection device and method based on a quartz tuning fork. Background technique [0002] As an optical analysis method, laser spectroscopy has the characteristics of high resolution and selectivity, no secondary pollution and non-destructiveness, and is widely used in atmospheric environment monitoring, industrial processing control, combustion diagnosis and respiratory gas composition diagnosis Wait. At present, in terms of technical principles, laser spectroscopy technology is divided into: spectroscopy technology based on high-precision optical cavity (such as cavity ring-down spectroscopy, cavity enhancement spectroscopy or integral cavity spectroscopy), modulation spectroscopy technology (such as wavelength / frequency modulation, magnetic Rotation modulation spectrum), direct absorption spectrum and photoacoustic spectrum. In general, th...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/31
CPCG01N21/1702G01N21/31G01N2021/1704
Inventor 李劲松许林广
Owner ANHUI UNIVERSITY
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