Aerosol particle detecting device and detecting method based on Sagnac interferometer

• Main Authors: HU FENG, ZHAO WEINAN, LI JINGXUAN, CHEN LINLIN, LI BAOSHENG, CHEN LIJUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.11.2019
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The present invention relates to an aerosol particle detecting device based on a Sagnac interferometer. The detecting device comprises a laser, a first polarizer, a beam expander, a gas collection device, an objective lens, a Sagnac interferometer, a second polarizer, and a CCD camera that are arranged sequentially along a beam irradiation direction; the CCD camera is electrically connected with the computer; the gas collection device comprises a gas flow cavity and a gas diffusion cavity that are both hollow; both the top of the gas flow cavity and the bottom of the gas diffusion cavity are provided with a notch with a corresponding size; the cavity space of the gas flow cavity and the cavity space of the gas diffusion cavity communicate with each other from the two notches; and an air inlet and an air outlet are respectively arranged at different sides of the gas flow cavity. Correspondingly, the present invention also provides an aerosol particle detecting method based on the Sagnacinterferometer. Accordin