Photoacoustic sensing device and method

A technology of acoustic sensing and photoacoustic signals, applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of weak photoacoustic signals and low efficiency of sound field detection, and achieve strong universal application Sexuality, performance improvement, and effects of avoiding photothermal noise

Active Publication Date: 2021-07-30
SHANXI UNIV
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Problems solved by technology

So as to solve the technical problem of weak photoacoustic signal due to the low detection efficiency of the sound field in the vibrating arm of the quartz tuning fork due to the traditional quartz-enhanced photoacoustic spectroscopy gas sensing system having only one sound source

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  • Photoacoustic sensing device and method
  • Photoacoustic sensing device and method

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Embodiment Construction

[0041] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments. It should be clear to those skilled in the art that the specific implementation is only to help understand the present invention, and should not be regarded as a specific limitation on the present invention.

[0042] The multi-pass pool of the present invention is designed using spherical aberration theory, and the multi-pass pool is composed of two spherical reflectors (reflector I1 and reflector II2), as figure 2 with 4 Shown; Two spherical reflectors are respectively fixed on the cage plate 10 by a cage structure, the cage structure is as Figure 4 shown. The design of the multi-pass cell should follow the following rules: 1) the excitation beam folded multiple times must be distributed on a plane to ensure that the vibration arm gap can pass through the quartz tuning fork 3; 2) due to the limited length o...

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Abstract

The invention discloses a photoacoustic sensing device and method. The device comprises a light source module, a multi-pass cell and a photoacoustic signal detection and data processing module, wherein the multi-pass cell comprises a spherical reflector I and a reflector II which are fixed on two cage plates of a cage type structure, excitation light beams output by the light source module are coupled into the multi-pass cell, the excitation light beams are folded multiple times through the two spherical reflectors, the tracks of the excitation light beams are distributed on the same plane in a vibration arm gap of a quartz tuning fork, light spot patterns in single-line distribution are generated on the two reflectors, the quartz tuning fork is arranged at the central position of the optical axis of the multi-pass cell, and a folded light beam generates a plurality of sound sources along the symmetry axis of the quartz tuning fork, so that the quartz tuning fork can be excited by the plurality of sound sources at the same time, more sound waves are effectively collected, and photoacoustic signal output is enhanced. According to the invention, the technical problems of low sound field detection efficiency and weak photoacoustic signals caused by the fact that a traditional quartz enhanced photoacoustic spectrum gas sensing system only has one sound source are solved.

Description

technical field [0001] The invention relates to photoacoustic spectrum measurement technology, in particular to a photoacoustic sensing device and method. Background technique [0002] Trace gas optical sensing technology based on laser absorption spectroscopy has been widely used in atmospheric monitoring, medical diagnosis, industrial process control, etc. due to its unique advantages of high selectivity, high sensitivity, and online real-time monitoring without any sample preparation. fields. Several methods based on laser absorption spectroscopy, such as tunable diode laser absorption spectroscopy (TDLAS), cavity-enhanced absorption spectroscopy (CEAS), quartz-enhanced photoacoustic spectroscopy (quartz-enhanced photoacoustic spectroscopy), etc., have been developed for trace gases detection, thus laying the foundation for the emergence of robust and reliable gas sensors. Among these gas detection technologies, quartz-enhanced photoacoustic spectroscopy is a very attra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/31
CPCG01N21/1702G01N21/31G01N2021/1704
Inventor 董磊崔茹悦武红鹏
Owner SHANXI UNIV
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