Membrane-type minitype photoacoustic cell and application thereof

Abstract

The invention discloses a membrane-type minitype photoacoustic cell and an application thereof. The membrane-type minitype photoacoustic cell and the application thereof are characterized in that the membrane-type minitype photoacoustic cell is provided with a cylinder body, a vibration sensing thin film is arranged at one end of the cylinder body, an optical fiber is plugged into the other end of the cylinder body, and a cylindrical photoacoustic cavity is formed. An airflow through-hole is arranged on the lateral wall of the cylinder body, the detection light and the exciting light modulated by audio frequency signals are transmitted through the optical fiber. The membrane-type minitype photoacoustic cell has a miniaturized volume, the detection sensitivity is high, the photoacoustic detection is in an all-optical structure, and the membrane-type minitype photoacoustic cell can be used for gas concentration detection under inflammable and explosive circumstances.

Description

technical field [0001] The invention relates to a micro-photoacoustic pool, in particular to a diaphragm-type micro-photoacoustic pool. Background technique [0002] With modern industrialized production and changes in people's lifestyles, there are various toxic and harmful gases in people's living environment, and changes in air quality have brought huge hidden dangers to human health and public safety. All countries in the world are developing various gas detection technologies to meet the needs of timely, accurate and efficient detection in the fields of atmospheric environment monitoring, greenhouse effect changes, air pollution conditions, medical health diagnosis, industrial production safety, and even national defense, national security and anti-terrorism. The need for gas detection technology. [0003] The spectroscopic analysis technology developed based on the optical properties of matter has been focused on due to its advantages such as wide measurement range, h...

AI Technical Summary

Problems solved by technology

[0004] The photoacoustic cell of the existing photoacoustic spectroscopy detection system is large in volume, the structure of the spatial optical path is complex, and the adjustment of the optical path is difficult, and the photoacoustic cavity inevitably uses an optical window, which will generate noise caused by window absorption and scattering; in addition, most of the existing Photoacoustic systems mostly use capacitive microphones or tuning forks to pick up photoacoustic signals. Photoacoustic signals need to be converted into electrical signals by microphones or tuning forks and then amplified. This process of picking up photoacoustic signals will inevitably introduce electrical noise, affecting Detection accuracy, and because of the electrical signal in the photoacoustic cavity, it limits its gas detection application in flammable and explosive environments

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