Importance

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Abstract

A laser warning device for sector-by-sector surveillance of the air space, comprises a plurality of module sections such that each surveyed sector is coupled through an optical antenna and an optical buffer to a module section. Each module section includes an optical fiber input for receiving a beam of light transmitted through the optical fiber, elements for dividing the transmitted beam of light into at least a first and a second part beam, at least a first and a second optical fiber path for transmitting the first and second part beam respectively, filters provided in the first fiber path for filtering the first part beam to a narrow band beam first detector for detecting the filtered first part beam and delivering a signal representing the amplitude of the filtered first part beam, second detector for detecting the second part beam and for delivering a signal representing the amplitude of the second part beam and an electronic unit for summing the signals from the first and second detector and for comparing the summed signal value with a threshold value.

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First Claim