Device for measuring a nonreciprocal phase shift produced in a c

Details Device for measuring a nonreciprocal phase shift produced in a c Device for measuring a nonreciprocal phase shift produced in a c

1987-03-03

1987-11-10

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01C 1964

Patent

active

047053992

ABSTRACT:
The device for measuring a nonreciprocal phase shift involves phase modulation of countercirculating waves in a closed-loop interferometer by means of a reciprocal-effect phase modulator. The modulating signal is a periodic signal having a period 2t.sub.o, where t.sub.o is the transit time of an electromagnetic wave in the closed loop. A digital phase ramp generated in the form of a stair-step signal is combined with the phase-modulating signals and applied as feedback. In an additional embodiment, control circuits are provided for correcting the modulation scale factor.

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