FIELD: electrical engineering.
SUBSTANCE: fibre-optic security detector including joint interferometers comprises a station part with a transceiver apparatus connected with the linear part of said detector. The linear part constitutes a branched optical circuit based on splitters and a fibre-optic cable, by means of connecting couplings and a transport cable connecting the transceiver apparatus and the sensing elements of the security fibre-optic detector, containing a closed and an open contours forming reflection signals wherein the same segments of the optical fibre of the cable are the sensing elements of interferometers wherein a phase shift of the probing pulse is created in accordance with the exerted physical impact, the same for both contours, wherein the closed contour constitutes a Sagnac interferometer and the open contour constitutes a Michelson interferometer.
EFFECT: increase in the accuracy of determining the site of impact on the sensing element, provided uniform sensitivity of the sensing part of the detector and increase in the reliability thereof.
10 cl, 12 dwg
