FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment using optical fiber, to fiber-optic security detectors. The linear part of the security fiber-optic detector, using combined interferometers, is a branched optical circuit based on splitters and fiber-optic cable, connecting the transceiver device and the sensitive elements of the detector, containing closed circuits, in which the same segments of the optical fiber of the cable are the sensitive elements of interferometers, in which a phase shift of the probing pulse is created in accordance with the physical impact, the same for both circuits, moreover, one closed circuit is a Mach-Zehnder interferometer, and the other closed circuit is a Sagnac interferometer.
EFFECT: present invention is aimed at increasing the accuracy of determining the location of the impact on the sensitive element, ensuring uniform sensitivity of the sensitive part of the detector, increasing the reliability of the detector, realizing its purpose.
10 cl, 12 dwg
