Phase retarding laser radiation detection system

Details Phase retarding laser radiation detection system Phase retarding laser radiation detection system

1986-03-03

1988-01-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250550, 356152, G02B 2742

Patent

active

047193433

ABSTRACT:
A laser radiation detection system is disclosed comprising phase retarding apparatus for retarding a portion of the laser radiation incident on the system, optical focusing apparatus, detector apparatus and an electrical circuit. The optical focusing apparatus focuses the incident radiation on the detector apparatus. The detector apparatus is located in the focal plane and detects the presence of laser radiation due to the uneven distribution of light caused by the interference of the retarded portion of the incident radiation with the portion that remains in phase. The detector apparatus supplies output signals in response to the incident radiation received by each detector to the electrical circuit which then compares the various outputs from the detector apparatus in pairs and outputs a signal indicating the presence of laser radiation when the sum of the differences of the detector outputs is greater than a predetermined threshold value.

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patent: 4624563 (1986-11-01), Johnson

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