LASER RANGEFINDER Russian patent published in 2021 - IPC G01C3/08 G01S17/02 

FIELD: semiconductors.

SUBSTANCE: laser rangefinder containing the main and test emitters of different power with power circuits, a photodetector with a lens, a threshold device with a variable threshold adjuster connected at the output of the photodetector and connected at the output with a control circuit and a time interval meter, the threshold device is equipped with a constant threshold level adjuster U_o, variable threshold adjuster U(Z), where Z is the current value of the range, and the power supply circuit of the main emitter is connected to the output of the control circuit, the output energy Е₀ of the probe radiation is limited by the relation where D_pd is the diameter of the photodetector lens, ψ is the angle of divergence of the probe emitter, R is the distance to the mirror reflector, E_min is the minimum radiation energy received by the photodetector, E_mpl is the maximum permissible level of illumination of the photodetector, and the variable threshold U (Z) is The scatter envelope is set above the backscatter envelope for all possible dissipation factors. The variable threshold can be inversely proportional to the third power of the current range Z.

EFFECT: ensuring a safe mode of operation of the photodetector while maintaining the required probability of reliable measurements in a wide range of ranges.

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