Interferometric signal analysis with modulation switching

Details Interferometric signal analysis with modulation switching Interferometric signal analysis with modulation switching

1990-06-27

1992-08-11

Buczinski, Stephen C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01B 902

Patent

active

051373572

ABSTRACT:
In a fiber optic rotation sensor, two phase modulators are symmetrically offset with respect to the center of an optical fiber loop and alternately excited by a waveform whose frequency alters the differential phase between counter-propagating light waves in the loop to maintain a fixed intensity signal at a detector upon loop rotation. The difference between the waveform frequencies is proportional to the speed of sensor rotation while the mean value of the waveform frequencies equals the frequency value in the absence of sensor rotation. In the alternative, a single modulator is excited by a waveform whose polarity is reversed at intervals of time.

REFERENCES:
patent: 4545682 (1985-10-01), Greenwood
patent: 4645345 (1987-02-01), Domann
patent: 4863272 (1989-09-01), Coccoli
patent: 4981358 (1991-01-01), McBrien et al.
patent: 4998822 (1991-03-01), Steele
"Integrated Optics: A Practical Solution for the Fiber Optic Gyro," SPIE vol. 719, pp. 101-112 (1986).

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