Surface acoustic wave gyroscope

Details Surface acoustic wave gyroscope Surface acoustic wave gyroscope

1980-10-18

1983-05-24

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Gyroscopically controlled or stabilized

73505, 310313R, G01P 344

Patent

active

043844090

ABSTRACT:
A surface acoustic wave gyroscope which detects a change in the propagation velocity of a surface acoustic wave as a function of the rotational velocity of a medium on whose surface the acoustic wave is propogated, is disclosed. In a first embodiment using a fixed frequency oscillator to generate the surface acoustic wave, the change in the propagation velocity is detected as a phase shift between the generated and detected waves. In an alternate embodiment the detected surface acoustic wave is used as a feedback signal to an amplifier to form an oscillator whose frequency varies as a function of the surface waves propagation velocity. In the preferred embodiment, two surface acoustic waves are generated in opposite directions about the cylindrical surface of a substrate.

REFERENCES:
patent: 3352162 (1967-11-01), Hart
patent: 3395270 (1968-07-01), Speller
patent: 3491453 (1970-01-01), Vergoz
patent: 3910373 (1975-10-01), Newburgh et al.
patent: 4126047 (1978-11-01), Sethares et al.
patent: 4167120 (1979-09-01), Shaw et al.
W. M. Macek & D. Davis Jr., "Rotation Rate Sensing With Traveling-Wave Ring Lasers", Applied Physics Letters, vol. 2, No. 3, Feb. 1963.
V. Vali & W. Shorthill, "Ring Interferometer 950 m Long", Applied Optics, vol. 16, No. 2, Feb. 1977, p. 290.
S. Ezekiel & S. R. Balsamo, "Passive Ring Resonator Laser Gyroscope", Applied Physics Letters, vol. 30, No. 9, May 1977, p. 478.

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