Measuring and testing – Speed – velocity – or acceleration – Response to multiple sensing means or motion conditions
Patent
1982-06-29
1984-02-07
Gill, James J.
Measuring and testing
Speed, velocity, or acceleration
Response to multiple sensing means or motion conditions
73178R, 73504, 73517R, G01C 1958, G01C 2100, G01P 1508
Patent
active
044295731
ABSTRACT:
A dual function device measures both inertial acceleration and rotation rate using a common birefringent ring resonator. A beam from a laser source is split, forming two orthogonally polarized beams which are coupled through respective Bragg cells and into a common waveguide. The beams are subsequently coupled into a ring resonator waveguide which has a proof-mass disposed thereon for applying acceleration forces to the resonator. Acceleration is measured when forces stress the proof-mass, detuning the cavity with respect to the horizontally polarized wave and thereby affecting output energy coupled therefrom. Similarly, rotation is measured when there is a rotation rate in the plane of the waveguide, which detunes the cavity with respect to the vertically polarized beam. Output energy from the waveguide cavity is used to indicate the degree of acceleration and/or rotation and to provide feedback for restoring resonance.
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Bush Freddie M.
Gibson Robert P.
Gill James J.
Lane Anthony T.
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