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Research/Patents/US 5090809
US 5090809

MODULATION FREQUENCY CONTROL IN A FIBER OPTIC ROTATION SENSOR

Assignee

UNITED TECHNOLOGIES CORPORATION, A CORP. OF DE.

Filed

Jun 4, 1990

Granted

Feb 25, 1992

Location

EAST HARTFORD CT US

Abstract

In a fiber optic rotation sensor having a pair of light waves counter-propagating in an optical waveguide loop, a phase modulator is driven by a modulating signal at the loop eigenfrequency. Upon exiting the loop the waves are combined into a light intensity signal which is sensed, the sensed signal including a component in quadrature with a desired rotation rate component, the magnitude of the quadrature component being proportional to any deviations in the frequency of the modulating signal from the loop eigenfrequency. The phase modulator is servo-controlled so as to drive the quadrature component to zero, thereby compensating for any deviations in the modulator frequency from the loop eigenfrequency.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jan 29, 1991

Rescinded

Apr 10, 1991

Duration

2 months

Inventor

  • 1CARL M. FERRAR

Technology Domains

Sensors

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External Sources

Google Patents — US 5090809USPTO Full Patent (PDF)Browse active SO patents

Record Details

Patent number
US 5090809
Application
07533196
Aerospace match
Yes
Dataset source
35 USC §181 SO records

Browse by Assignee

UNITED TECHNOLOGIES CORPORATION, A CORP. OF DE.
Back to patent indexSource: USPTO 35 USC §181 secrecy order records