MULTI-CAVITY SUPERIMPOSED NON-RESONANT PHOTOACOUSTIC CELL AND GAS DETECTION SYSTEM

摘要

A multi-cavity superimposed non-resonant photoacoustic cell and a gas detection system. The multi-cavity superimposed non-resonant photoacoustic cell comprises a cylindrical metal housing (1), a plurality of non-resonant photoacoustic cavities (2), an optical fiber Fabry-Perot acoustic wave sensor sensitive diaphragm (3), an optical glass window (4), a gas inlet (5) and a gas outlet (6). The round sensitive diaphragm (3) of the optical fiber Fabry-Perot acoustic wave sensor is fixed at one side of the cylindrical metal housing (1), and the other side of the cylindrical metal housing (1) is sealed by the optical glass window (4). A gas to be detected enters from the gas inlet (5), diffuses into the plurality of non-resonant photoacoustic cavities (2), and is discharged from the gas outlet (6) on the other side. The present invention may greatly increase the intensity of photoacoustic signals of the system by means of reducing the radius of the non-resonant photoacoustic cavities (2) and the superimposition of the photoacoustic signals in the plurality of photoacoustic cavities.