LASER SENSOR FOR DETERMINING PARTICLE SIZE Russian patent published in 2019 - IPC G01N15/02 G01N15/14 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment and concerns a laser sensor module for determining particle size for determination of air quality. Module comprises laser, detector, electric exciter and evaluation unit. Laser emits light in response to signals given by exciter. Detector is configured to determine the first interference signal of optical wave self-mixing in the laser laser resonator, wherein the interference self-mixing signal arises from the laser light reflected from the particle re-entering the laser resonator. Evaluation unit is configured to determine particle size by determining relative distance between particle and laser and determining information on amplitude using first interference self-mixing signal. Laser sensor module further comprises a focusing area, wherein the relative distance relates to the distance between the focusing region and the particle, and the evaluation unit is configured to determine the relative distance based on at least one characteristic of the first interference self-mixing signal associated with the distance between the first focusing area and the particle.

EFFECT: technical result consists in the device design simplification.

15 cl, 11 dwg