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Quartz tuning fork photoacoustic gas sensing device based on broadband light source dual-wavelength difference

A quartz tuning fork and broadband light source technology, which is applied in the fields of analyzing fluids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound wave emission technology, and color/spectral characteristic measurement. and other problems, to achieve the effect of reducing cost, small size and reducing strength

Inactive Publication Date: 2012-06-20
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dual-wavelength differential quartz tuning fork photoacoustic gas sensing device based on a broadband light source to solve the shortcomings of the prior art such as large volume, high power consumption, high price, and difficulty in wide-scale promotion.

Method used

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  • Quartz tuning fork photoacoustic gas sensing device based on broadband light source dual-wavelength difference
  • Quartz tuning fork photoacoustic gas sensing device based on broadband light source dual-wavelength difference
  • Quartz tuning fork photoacoustic gas sensing device based on broadband light source dual-wavelength difference

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Embodiment Construction

[0023] see figure 2 , image 3 , the output of the low frequency square wave generator 1 and the output of the high frequency square wave generator 2 are coupled by the adder 4 to power the laser diode 8 through the current controller 6, and the output of the low frequency square wave generator 3 and the high frequency square wave The output of the generator 2 is coupled by the adder 5 and then supplied to the laser diode 9 through the current controller 7; the output light of the laser diode 8 and the laser diode 9 is split and coupled by the beam splitter 10, and the coupled optical path 12 is placed on the There is a focusing lens 13 and an acoustic cavity 14 . in,

[0024] An air inlet 21 and an air outlet 22 are arranged on the left and right sides of the sample cell 16 respectively.

[0025] The acoustic resonance cavity 14 is a tubular object with a length of 5.3mm, an outer diameter of 1.4mm, and an inner diameter of 1mm, and a slit 141 with a width of 0.15mm and ...

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Abstract

The invention discloses a quartz tuning fork photoacoustic gas sensing device based on a broadband light source dual-wavelength difference. A pipy resonant cavity with a slit and a quartz tuning fork are arranged in a sample pool. In the device, a laser diode is used for probing non absorption background noise, the other laser diode is used for probing nitrogen dioxide, coupling and beam splitting are carried out on the two laser diodes through a beam splitting prism, a photoelectric probe is used for monitoring the power of the laser diodes, light is focused to the pipy resonant cavity by a focusing lens, the output end of the quartz tuning fork is connected with the input end of a phase-locked amplifier, the focus of the focusing lens is arranged in the pipy resonant cavity, the output end of a high frequency square wave generator is electrically connected with the input end of the phase-locked amplifier, and the photoelectric probe, the high frequency square wave generator and a lower frequency square wave generator are connected with an external computer.

Description

technical field [0001] The invention relates to the field of gas sensing devices, in particular to a dual-wavelength differential photoacoustic gas sensing device based on an off-axis acoustic resonator quartz tuning fork, specifically a dual-wavelength differential quartz tuning fork photoacoustic nitrogen dioxide gas sensing device based on a broadband light source . Background technique [0002] With the rapid development of the national economy, the environment and health have attracted widespread attention. Nitrogen dioxide (NO 2 ) is one of the toxic and corrosive polluting gases, which is seriously harmful to human health, so nitrogen dioxide (NO 2 ) has become one of the preferred monitoring pollutants for air quality forecasting in my country. Currently nitrogen dioxide (NO 2 ) detection methods mainly include electrochemical method, gas chromatography, mass spectrometry and differential absorption spectroscopy. At present, the differential absorption spectrosc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N29/02G01N29/14
Inventor 高晓明易红明刘锟谈图汪磊
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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