RECEIVER OF PULSED LASER SIGNALS Russian patent published in 2021 - IPC G01J1/44 G01C3/08 

FIELD: laser technology.

SUBSTANCE: invention relates to laser technology, namely to the equipment for receiving laser radiation. A receiver of pulsed laser signals is proposed, containing a sealed housing with a protective window, behind which a photosensitive element and a signal processing circuit are placed, including an amplifier and an output signal generator, the output of which is the output of the device, a second photosensitive element with a second amplifier is introduced, a series-connected differentiating link and a zero comparator are introduced at the outputs of each amplifier. The outputs of zero comparators are connected to the inputs of a switch controlled from the output of a threshold device switched on at the output of the first differentiating link, the output of the switch is connected to the input of the output signal generator, while the sensitive sites of photosensitive elements are located at the minimum possible distance b*=h(2tgα+tg2β) from each other, where h is the distance from the inner surface of the protective window to the sensitive sites of photosensitive elements, α the maximum angle of incidence of the received radiation on the sensitive area of the first photosensitive element, β≥0 is the angle of inclination of the protective window. In this case, the time constant of the differentiating link τ is less than the duration of the front t_fr of the received pulse, and the trigger level U_thr of the threshold device satisfies the condition U_thr=(0.8-0.99)U'_max, where U'_max is the amplitude of the output reaction of the first differentiating link to the input signal of the maximum amplitude not exceeding the level of the amplifier limitation. In this case, the gain coefficient k₁ of the first amplifier is set from the trigger condition of the output signal generator from the received signal of the minimum amplitude, and the gain coefficient k₂ of the second amplifier corresponds to the condition where S₁ and S₂ are the sensitivity of the first and second photosensitive elements; η_a is the aperture loss coefficient of the second photosensitive element relative to the first; η_ρ is the product of the reflection coefficients of the sensitive area of the first photosensitive element and the protective window; D is the linear dynamic range of the first amplifier, and where K₁ is the transmission coefficient of the first channel, and K₂ is the transmission coefficient of the second channel.

EFFECT: ensuring high accuracy of temporary fixation of the received signal in an extremely wide dynamic range with minimal measurement time and without increasing the dimensions of the equipment.

1 cl, 3 dwg