HYDROACOUSTIC FIBRE-OPTIC PRESSURE SENSOR Russian patent published in 2017 - IPC G01L11/00 

FIELD: physics, control and alarm system.

SUBSTANCE: stated hydroacoustic fiber-optic pressure sensor contains a frame with an air cavity formed by a pin, two flanges and an annular multilayer fiber-optic sensor element, wherein each preceding layer of the fiber-optic sensor element contains a layer of fast-curing adhesive performing gluing of the fiber turns and providing filling and leveling of the interturn spacings, until a smooth and rigid cylindrical surface is formed, and each successive layer of the optical fiber with the opposing directions of the turns also contains a layer of fast-curing adhesive performing gluing of the fiber turns and providing filling and leveling of the interturn spacings. The technical result consists in developing of the annular sensor element formed by multilayer winding of the optical fiber in a spiral with the possibility of gluing the turns and the fiber layers in a single oscillating system differing in sensitivity for the sound pressure in the operating frequency range and in low-loss of the optical power when subjected to the external hydrostatic pressure, as well as in ensuring operability of the hydroacoustic annular fiber-optic pressure sensors as a part of the hydroacoustic antenna composed by the multilayer fiber-optic rings capable of withstanding the external hydrostatic pressure without breaking; low-loss of the optical power in the fiber-optic ring under the conditions of high hydrostatic pressure, which allows to combine the sensors in a multi-element antenna.

EFFECT: hydroacoustic pressure sensor based on the annular fiber- optic interferometric sensor element.

2 cl, 2 dwg