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A dual-spectrum gas detection device and method based on a quartz tuning fork

A quartz tuning fork, gas detection technology, applied in measurement devices, color/spectral characteristic measurement, material analysis by optical means, etc., can solve the problems that have not been found yet, and achieve the effect of wide concentration detection range, compact system and low cost

Active Publication Date: 2021-08-24
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, no research has been found on the method of simultaneously acquiring the above two spectral signals using a quartz tuning fork and its application

Method used

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  • A dual-spectrum gas detection device and method based on a quartz tuning fork
  • A dual-spectrum gas detection device and method based on a quartz tuning fork
  • A dual-spectrum gas detection device and method based on a quartz tuning fork

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Embodiment

[0027] like figure 1As shown, a dual-spectrum detection device based on a quartz tuning fork includes a wavelength tunable laser 1, a focusing and collimating lens 2, a square aperture with adjustable aperture 3, a sample cell 4, a light-transmitting 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 computer control unit 13 is connected with digital-analog conversion module 12-2, and the signal output end of digital-analog conversion module 12-2 is connected with laser control module 11, and laser control module 11 It is connected to the wavelength tunable laser 1 under control; the two ends of the sample cell 4 are respectively opened and embedded with a light-transmitting window 5, and the sample cell 4 is provided wit...

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Abstract

The invention discloses a dual-spectrum gas detection device and method based on a quartz tuning fork, which is characterized by comprising a wavelength tunable laser, a focusing and collimating lens, an aperture adjustable diaphragm, a sample cell, a light-transmitting window, and a first tuning fork. , Air inlet and outlet, second tuning fork, first preamplifier circuit and second preamplifier circuit, laser control module, analog-to-digital conversion module, digital-to-analog conversion module, computer control unit. The invention utilizes the resonance characteristics and piezoelectric effect of the quartz tuning fork, and uses it as an optical signal detector and an acoustic signal detector at the same time, and realizes a dual-spectral technology for simultaneously acquiring direct absorption spectral signals and photoacoustic spectral signals. The gas concentration information obtained from the signal inversion provides correction for the photoacoustic spectrum. The corrected photoacoustic spectrum and the direct absorption spectrum are respectively used for the analysis of low concentration and high concentration samples, which can make full use of the laser light intensity and realize a wide dynamic range of gases. Concentration measurement.

Description

technical field [0001] The invention relates to the technical field of photoelectric or spectral measurement, 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-destructive properties, and is widely used in atmospheric environment monitoring, industrial process control, combustion diagnosis and respiratory gas composition diagnosis Wait. At present, in terms of technical principles, laser spectroscopy can be divided into: spectroscopy based on high-precision optical cavities (such as: cavity ring-down spectroscopy, cavity-enhanced spectroscopy or integrated cavity spectroscopy), modulation spectroscopy (such as: wavelength / frequency modulation, magnetic rotational modulation spectroscopy), direct absorption spectroscopy and photoacoustic spectroscopy. In genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/31
CPCG01N21/1702G01N21/31G01N2021/1704
Inventor 李劲松许林广
Owner ANHUI UNIVERSITY
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