Method for reading out rotation rate with a passive optical reso

Details Method for reading out rotation rate with a passive optical reso Method for reading out rotation rate with a passive optical reso

1987-07-28

1989-04-25

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

048252611

ABSTRACT:
A rotation rate readout method employing a passive optical resonator. The ring resonator is operated at approximate resonance in reflection and rotation rate-dependent phase shifts are detected, in particular as first harmonics, in the resonator. Two partial light beams are first frequency shifted by equal and opposite amounts, such frequency shift being modulated. Light components coupled out of the resonator pass through a mode filter in the opposite direction and are detected as an interference signal by an opto-electronic converter. The latter signal is demodulated with respect to the modulation frequency or its harmonics and the rotation rate signal obtained therefrom. Self-compensation of the optical and electronic readout systems may be attained by periodic brief and strong damping of the ring resonator. In contrast with known methods wherein two channels are separately processed and two mode filters required, the interference signal is processed in accordance with the invention requiring only a single mode filter.

REFERENCES:
patent: 4323310 (1982-04-01), Shaw et al.
patent: 4673293 (1987-06-01), Sanders
"Passive Fiber-Optic Ring Resonator for Rotation Sensing", Meyer et al., Optical Society of Americ, 12-1983, pp. 644-646.

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