FIELD: measuring equipment.
SUBSTANCE: fibre optic security detectors, as well as products, methods and means related to fibre optic security detectors. The optical circuit of a fibre-optic security detector, which uses combined interferometers, is a combined interferometer for a fibre-optic security detector, implementing an optical circuit comprising closed and open circuits that generate reflection signals that have the same sections of optical fibre cable are sensitive elements of interferometers in which a phase shift of the probing pulse is created in accordance with the applied physical effect, which is the same for both circuits. Moreover, the closed loop is a Mach-Zehnder interferometer, and the open loop is a Michelson interferometer.
EFFECT: uniform sensitivity of the sensitive part of the fibre-optic security detector, increasing the reliability of the fibre-optic security detector.
6 cl, 12 dwg
