Photoacoustic cell of modularized structure and suitable for laser photoacoustic spectrum detection

Abstract

The invention relates to a photoacoustic cell of a modularized structure and suitable for laser photoacoustic spectrum detection. The photoacoustic cell comprises a photoacoustic cell casing with a main resonant cavity, a gas inlet, a gas outlet, an accommodating groove for placing a rheomicrophone, a sound hole for communicating the accommodating groove with the main resonant cavity, a light inlet and a light outlet, windows are fixed in the light inlet and outlet respectively, the two transverse sides of the photoacoustic cell are detachably connected with range extending modularized assemblies respectively, and the free ends of the two range extending modularized assemblies are detachably connected with end caps respectively; each range extending modularized assembly is composed with range-extending resonant cavity bodies distributed coaxially and connected deteachably, each range-extending resonant cavity body is internally provided with range-extending resonant cavity communicatedwith the main resonant cavity and penetrating the range-extending resonant cavity body in the traverse direction, and the range-extending resonant cavities and the main resonant cavity are the same in radius and distributed coaxially. The total length of the resonant cavity can be adjusted flexibly according to requirement of the measurement environment, the cell constant of the photoacoustic cell can be also adjusted, and thus, the photoacoustic signal intensity and detection system sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of detecting trace gases with high sensitivity of photoacoustic spectroscopy, in particular to a photoacoustic cell with a modular structure suitable for the detection of laser photoacoustic spectroscopy. Background technique [0002] With the rapid development of modern industry, the importance of trace gas detection is self-evident. The detection of trace gas has been widely used in various fields such as environmental monitoring, chemical environmental protection, biomedicine, food manufacturing and fire forecasting. In environmental monitoring, trace gas detection plays a huge role. Due to people's high requirements for environmental health awareness and the complexity and variability of the environment itself, the research and development of highly sensitive gas detection technology and system devices is more urgent. Compared with other gas detection technologies, photoacoustic spectroscopy technology ...

AI Technical Summary

Problems solved by technology

[0003] At present, the structural form of the photoacoustic gas detection device is basically the same. Due to the limitations of the traditional structure and technical solutions, after the photoacoustic gas detection device is assembled, the inherent performance of the device is usually not adjustable, so the assembled The system device can only rely on the external electronic system to improve its detection performance index, so the adjustment flexibility of the whole machine is poor, and there are obvious deficiencies

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