The ceilometer YGY150 by NE-OPTECH is based on the backscattering effect of atmospheric aerosol particles (the main component of clouds) on laser light. It emits detection laser pulses. After the meter backscattering of particles in the clouds, the reflected laser light is reflected by the telescope of the ceilometer. After receiving, the backscattering intensity signals at different times (that is, different heights) are obtained; through inversion calculation, the extinction coefficients of each height layer of the atmosphere are obtained, and then the height and thickness of the clouds are determined.