Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-08-28
1991-05-14
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
050150952
ABSTRACT:
The direction and rate of rotation of a closed-loop fiber-optic angular rate sensor is determined by employing acousto-optic modulators in each arm of the sensor and determining the frequency difference between the modulators. Since the modulators operate at a relatively high frequency, frequency measurements to within several hertz are implemented by providing the difference frequency and the sign of the difference frequency via the use of electronic mixers. Since the maximum difference frequency is in the order of a few megahertz, standard counters can thus be used to accurately measure the reduced frequency and hence provide information relating to the direction and rate of rotation.
Aboyoussef Ahmed
Hollinger Walter P.
Werner Walter V.
Allied-Signal Inc.
Massung Howard G.
Turner Samuel
Walsh Robert A.
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