Fiber optic sagnac interferometer with digital phase modulation

Details Fiber optic sagnac interferometer with digital phase modulation Fiber optic sagnac interferometer with digital phase modulation

1992-01-31

1993-05-25

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

052144887

ABSTRACT:
An open loop fiber optic rotation rate sensor of the type that is subject to bias errors arising from the coupling of disturbing signals into the input of a demodulator. Such errors are suppressed by the use of a demodulation signal that is statistically independent of all signal sources that may cause disturbing signals. A modulation signal generator includes a random number generator from which two signals (b.sub.0, b.sub.1) for a statistically alternating bias for activating optimal working points on the interferometer characteristic with positive or negative gradient and an appropriately matched demodulation signal (d) are derived. The demodulation signal, after transit time correction, acts upon the synchronous input of the synchronous demodulator.

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