Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1989-01-24
1989-11-21
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
350 9629, 250231P, 356345, H04R 102
Patent
active
048827169
ABSTRACT:
An optic fiber hydrophone comprises a wide spectrum optical source, a super-luminescent diode for example, associated with an optic fiber assembly comprising chiefly a side-hole optic fiber, subjected to the field of pressure, forming a sensor, transmitting the optic radiation in the slow and fast modes respectively, and a second fiber, not subjected to the field of pressure, the neutral axes of which are oriented with respect to the neutral axis of the first fiber so that the wave transmitted in slow mode in one fiber is transmitted in fast mode in the other fiber, it being possible to connect these two fibers by a polarization maintaining fiber in the event that the sensor is offset with respect to the source, a polarizing fiber enabling the creation of the interferences, and a radiation detector at the output of the fiber assembly.
REFERENCES:
patent: 4545253 (1985-10-01), Aricola
patent: 4751690 (1988-06-01), Krueger
Chalabi et al., "Partially Coherent Sources in Interferometric Sensors", First International Conf. Optic Fiber, Apr. 1983, pp. 132-135.
Xie et al., "Side-Hole Fiber for Fiber-Optic Pressure Sensing", Optics Letters, vol. 11, #5, Mar. 1986, pp. 333-335.
Optics Letters, vol. 11, No. 5, May 1986, pp. 333-335, Optical Society of America, New York, U.S.; H. M. Xie, et al.
First International Conference on Optical Fibre Sensors, Apr. 26-28, 1983, London, pp. 132-135; S. A. Al-Chalabi, et al.
Lefevre Herve
Rojas Dominique
Turpin Marc
"Thomson-CSF"
Steinberger Brian S.
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