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

FIELD: laser ranging.

SUBSTANCE: invention relates to laser ranging, namely to pulsed laser rangefinders. Pulse laser rangefinder containing the main and test emitters, a photodetector channel with a photodetector with a lens, a threshold device connected at the photodetector output and connected to a control circuit and a time interval meter, a control circuit is connected to the main emitter, the test emitter of lower power includes a laser diode and a microcollimator, the test emitter is installed behind the lens in front of the photodetector so that the optical axis of the test emitter passes through the sensitive area of the photodetector, the output beam of the test emitter is within the light hole of the lens, the microcollimator and the lens provide the divergence θ of the test output radiation according to the condition where D_t is the minimum target size; ∆θ - error of alignment of the parallelism of the test emitter; R_max - upper limit of the range of measured ranges; D₀ is the diameter of the receiving lens; E₀* is the radiation energy of the test emitter; E_min is the minimum received energy of the photodetector.

EFFECT: ensuring the safe operation of the photodetector in a wide range of ranges while maintaining the design characteristics of the small-sized rangefinder.

4 cl, 4 dwg