Method for detecting concentration of trace gas

A technology of trace gas and wide width, which is applied in the field of detection of trace gas by laser, can solve the problem of limited sensitivity of sensors, achieve excellent technical effect, accurate detection results, and improve sensitivity

Active Publication Date: 2018-09-04
HARBIN INST OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0008] Embodiments of the present invention provide a method for detecting trace gases to solve the technical problem of limited sensitivity of existing sensors

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  • Method for detecting concentration of trace gas
  • Method for detecting concentration of trace gas
  • Method for detecting concentration of trace gas

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Embodiment Construction

[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] In photoacoustic spectroscopy, since the detection limit of the sensor is proportional to the laser power, the output power of the tunable laser is crucial to the detection performance of the sensor. However, as far as tunable lasers are concerned, the laser power output outside the laser resona...

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Abstract

The embodiment of the invention relates to a method for detecting a trace gas. A semiconductor laser (1), a laser alignment focusing system (2), a quartz resonator (3), an impedance amplifier (4), a control and data acquisition system (5) and a computer (6) are arranged in a beam propagation direction in sequence. Laser output by the semiconductor laser (1) is focused through the laser alignment focusing system (2) and then is transmitted along the width surface of the quartz resonator (3), and source wave produced after gas molecule absorbs the laser directly acts on the width surface of thequartz resonator (3). Piezoelectric signals produced after the quartz resonator (3) is excited by the sound wave are transmitted to the impedance amplifier (4) and are subjected to signal demodulationand postprocessing through the control and data acquisition system (5) and the computer (6). The method can rapidly detect various trace gases in the atmosphere environment.

Description

technical field [0001] The invention relates to the field of laser detection, in particular to a method for detecting trace gas by using laser. Background technique [0002] There are many trace gases in the atmosphere, such as methane (CH 4 ), ozone (O 3 ), carbon monoxide (CO), etc., the concentration is on the ppt-ppm level, although their content is very low, they have a great impact on the environment. Accurately measuring the composition and content of these trace gases and their distribution changes with time and space is also of great significance for basic science and applied technology research. [0003] In the research of trace gas detection technology, measurement methods can be divided into non-spectral and spectroscopic methods. Compared with non-spectral measurement methods, spectroscopy has the advantages of high sensitivity and high resolution. At the same time, with the rapid development of laser spectroscopy technology and the advancement of laser devic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/39
CPCG01N21/1702G01N21/39G01N2021/1704
Inventor 马欲飞何应于欣
Owner HARBIN INST OF TECH
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