Optical waveguide vibration sensor and method

Details Optical waveguide vibration sensor and method Optical waveguide vibration sensor and method

1994-07-27

1996-03-05

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

73657, G01B 902

Patent

active

054972337

ABSTRACT:
An optical sensor that is particularly useful for measuring ground borne vibrations employs a planar optical waveguide structure to form a sensor for detecting ground born velocities and accelerations. An optical interferometer is used to detect phase shifts in optical signals guided by the waveguide caused by external vibrations. A pair of phase modulator electrodes is placed adjacent one of the legs of the interferometer and a coil of wire is connected between the pair of electrodes. A sensing element that produces a voltage in response to vibrations is connected across the electrodes. The voltage produced by the sensing element is applied to the pair of electrodes to cause phase modulation of optical signals guided by the leg of the interferometer adjacent the electrodes. The optical signals output from the interferometer are then processed to determine the velocity and acceleration associated with the vibration.

REFERENCES:
patent: 4632551 (1986-12-01), Pavlath
patent: 4899042 (1990-02-01), Falk et al.
patent: 5267336 (1993-11-01), Sriram et al.
Nelson et al., "Passive Multiplexing System for Fiber-Optic Sensors", Sep. 1, 1980, Applied Optics, pp. 2917-2920.

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