Phase modulator for fiber-optic sensors

Details Phase modulator for fiber-optic sensors Phase modulator for fiber-optic sensors

1985-08-22

1987-10-27

Cangialosi, Salvatore

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

356350, G02F 105, G02B 508

Patent

active

047032871

ABSTRACT:
A piezoelectric phase modulator for a fiber optic sensor is disclosed. The disclosed modulator is capable of relatively large amplitude mechanical vibrations, i.e., having a large converse piezoelectric effect, while at the same time having a relatively predictable and well-behaved direct piezoelectric effect. This result is accomplished by bonding a relatively active piezoelectric material, such as PZT, to a relatively stable piezoelectric material, such as quartz. An optical fiber may then be bonded to the relatively stable material, or to a structure attached thereto, as part of a fiber optic sensor loop. Excitation of the relatively active piezoelectric material will then produce a mechanical vibration in the relatively stable material and in the attached fiber comparable in magnitude to that experienced by the active material. Several embodiments of the invention are shown which are illustrative of devices which may be made according to the teachings disclosed.

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R. Ulrich, "Fiber-Optic Rotation Sensing with Low Drift" Optics Letters 5, pp. 173-175 (1980).
D. E. N. Davies and S. Kingsley, "Method of Phase Modulating Signals in Optical Fibers: Application to Optical Telemetry Systems," Electronics Letters 10, pp. 21-23 (1974).
D. A. Jackson, R. Priest, A. Dandridge and A. B. Tveten, "Elimination of Drift in a Single-Mode Optical Fiber Interferometer Using a Piezoelectric Stretched Coiled Fiber," Applied Optics 19, pp. 2926-2929 (1980).
K. Bohm, P. Marten, E. Weidel, "Direct Rotation-Rate Detection with a Fibre-Optic Gyro by Using Digital Data Processing," Electronics Letters 19, pp. 997-999 (1983).
"Piezoelectric Technology Data for Designers, " Vernitron Piezoelectric Division, pp. 1-5, undated, no author noted.

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