Measuring the relative effective lengths traversed by counterpro

Details Measuring the relative effective lengths traversed by counterpro Measuring the relative effective lengths traversed by counterpro

1988-09-09

1991-01-01

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

328185, G01B 902

Patent

active

049813587

ABSTRACT:
A sawtooth voltage is applied to an integrated optic phase modulator by means of a high impedance variable current source in response to a charge rate control signal. The phase modulator's capacitance accumulates the charge which manifests a voltage comprising the sawtooth signal. The sawtooth signal is also provided to a comparator which in turn provides a discharge signal upon detecting the sawtooth voltage as being greater than a selected reference signal magnitude. The discharge signal is provided to a means for discharging the accumulated charge from the capacitance of the integrated optic phase modulator. A compensating resistor may be connected between the current source and the phase modulator to automatically correct for sawtooth overshoot. Various data extraction techniques are disclosed, without limiting the invention since others may be used, including counting sawtooth resets, among others, and using a current splitter to store charge separately from the serrodyne modulation circuit and relating separately stored charge to angle or rate.

REFERENCES:
patent: 2927280 (1960-03-01), Cumming
patent: 3952306 (1976-04-01), Benton
patent: 4449059 (1984-05-01), Dickes
patent: 4735506 (1988-04-01), Pavlath
patent: 4759629 (1988-07-01), Everest et al.
"Transistor Sawtooth Foaming Circuit", Goodrich, RCA Technical Notes, 3-1964.
"Double Closed-Loop Hybrid Fiber Gyroscope Using Digital Phase Ramp", by H. C. Lefevre et al.
"Closed-Loop Fiber-Optic Gyroscope with a Sawtooth Phase-Modulated Feedback", in Optics Letter, vol. 10, Jun. 1985, by A. Ebberg et al.

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