Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-05-31
1995-10-10
Bovernick, Rodney B.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
385 3, 385 12, 359279, G01C 1972
Patent
active
054575320
ABSTRACT:
A rotation sensor for sensing rotation, particularly about an axis of a coiled optical fiber, wherein the coiled optical fiber has with light waves propagating in opposite directions in the coiled optical fiber, the phase relationship of the counter-propagating light waves providing a basis for indicating rotation of the sensor. A portion of the coiled optical fiber is a part of and affected by a bias optical phase modulator which causes a varying phase relationship between the light waves at a fundamental frequency. However, the varying phase relation ship has at least one harmonic which is due to mechanical vibration of the optical fiber that is a part of the modulator. This harmonic contributes to an erroneous indication of rotation. The amplitude of such harmonic is reduced by lowering the Q of the resonating fiber. This is effected by applying a damping material to the optical fiber and a portion of the modulator. A photodetector detects the counter-propagating waves and sends a corresponding electrical signal on to a signal component selection device that provides an indication of sensed rotation, including error due to the mechanically resonating optical fiber of the modulator.
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Dow Corning, New Product Information "Q3-6575 silicone dielectric gel" 1984.
August Richard J.
Dimond Kevin B.
Feth John R.
Laskoskie Clarence E.
Strandjord Lee K.
Bovernick Rodney B.
Honeywell Inc.
Sanghavi Hemang
Shudy Jr. John G.
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