Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1988-08-25
1989-11-28
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
048833584
ABSTRACT:
Light waves are allowed to pass clockwise and counterclockwise through a circuit optical path of at least one loop, and the light waves having passed through the optical path are interfered with each other. Phase modulator is inserted in one end of the circular optical path, by which the light waves are phase modulated. The intensity of the interference light is detected, as an electric signal, by a photodetector. The fundamental wave component of the modulation frequency of the phase modulator, contained in the electric signal converted by the photodetector, is synchronously detected by a first synchronous detector, from which is output a signal corresponding to an input angular velocity. Second and fourth harmonic components of the modulation frequency of the phase modulator, contained in the electric signal, are synchronously detected by second and third synchronous detectors. The phase modulator is controlled so that the ratio between the outputs from the second and third synchronous detectors is always equal to a preset reference value.
REFERENCES:
patent: 4796993 (1989-01-01), Sonobe et al.
Japan Aviation Electronics Industry Limited
McGraw Vincent P.
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