Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1987-10-07
1989-10-10
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964
Patent
active
048727547
ABSTRACT:
An improved fiber-optic inertial sensor of the Sagnac interferometer type is provided with the capablility of precise linear measurement of sensed motion. The sensor uses closed-loop synchronous demodulation of sensed signals representative of angular motion in a manner that permits operation over a wide dynamic range in inertial rate along with null stability and a high degree of noise rejection. The improved inertial sensor comprises a multi-turn sensing coil of optical fiber; an optical pulse source supplying optical pulses to both ends of the sensing coil so that the pulses are proagated in opposite directions through the coil; a phase modulator for introducing a non-reciprocal phase difference between the counter-propagating optical pulses, the relative phase difference between the pulses remaining fixed when the coil is stationary but changing when the coil is moved; and a circuit responsive to changes in the relative phase difference for (1) producing an output signal reresenting the magnitude and direction of the change and (2) adjusting the phase of the optical pulses supplied to the sensing coil to at least partially null out any change in the relative phase difference.
REFERENCES:
patent: 4529312 (1985-07-01), Pavlath
patent: 4545682 (1985-10-01), Greenwood
Ezekiel, Fiber-Optic Rotation Sensors, Tutorial Review, pp. 2-35.
Giallorenzi et al., Optical-fiber sensors challenge the competition, IEEE Spectrum, Sep., 1966, pp. 44-49.
Giallorenzi, Fibre optic sensors, Optics and Technology, Apr., 1971, pp. 73-78.
Bergh, et al. All-single mode fiber-optic gyroscope, Optical Society of America, Mar., 1981, 4 pages.
Cahill et al., Phase-nulling fiber-optic gyro, Optical Society of America, Mar., 1979, pp. 93-95.
Okamoto et al., All-Panda-Fibre Gyroscope With Long-Term Stability, Electronic Letters, May, 1984, pp. 429-430.
Arditty, et al., Sagnac effect in fiber gyroscopes, Optical Society of America, Aug. 1981, pp. 401-403.
Bohm, Low-Drift Fibre Gyro Using a Superluminescent Diode, Apr., 1981, 2 pages.
Lefevre et al., All-fiber gyroscope with inertial-navigation short-term sensivity, Optical Society of America, Sep., 1982, pp. 454-456.
McMahon et al. Fiber-optic transducers, IEEE Spectrum, Dec., 1981, pp. 24-29.
McGraw Vincent P.
Rudisill Stephen G.
Turner S. A.
LandOfFree
Constant frequency digital closed-loop optical fiber gyro does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Constant frequency digital closed-loop optical fiber gyro, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constant frequency digital closed-loop optical fiber gyro will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1953592