Compact laser warning receiver

Details Compact laser warning receiver Compact laser warning receiver

1992-11-09

1993-11-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 307311, H01J 4014

Patent

active

052605639

ABSTRACT:
A portable laser pulse detection device. Optical pulses are sensed by a photodiode, and if the pulse width is narrow enough to yield sufficient spectral energy within the bandpass of the tuned circuits, a "laser occurred" indication will be produced by the processing circuitry. Automatic adjustment of the detected output for non-laser incident radiation is made by varying the signal level into a sequential detection logarithmic amplifier by a voltage proportional to the integral of the incident radiation over a short period of time. The device is shielded against electromagnetic interference and adapts automatically to variations in background noise.

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patent: 4851689 (1989-07-01), Hasegawa

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