Crossing attempt detecting device for e.g. civil and military zone, has optoelectronic module processing interferometric signal to analyze phase difference between optical waves to generate alarm signal in case of abnormal interference

摘要

The device has a light source (1) emitting a radiation injected in an optical coupler (2) having optical fibers forming a Mach-Zehnder or Michelson interferometer. An optoelectronic module (7) processes an interferometric signal such that phase difference between optical waves of the signal is analyzed in time and in frequency to detect normal and abnormal interferences and generate an alarm signal in case of abnormal interference.