Patent · US Expired

Rotation rate measuring instrument

US4704032A · kind A · utility

2Cited by

1References

2Claims

0Family size

Assignee

Standard Elektrik Lorenz AG · DE

Inventors

Wilfried Auch · Asperg, DE
Helmut Graf · Regensburg, DE
Eberhard Schlemper · Leinfelden, DE

Key dates

Filing date	Dec 2, 1985
Grant date	Nov 3, 1987
Priority date	—
Expiry date	Dec 2, 2005

Classification

Technology area (CPC G)Physics
CPC primaryG01C19/72
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A rotation rate measuring instrument is disclosed in which two light beams propagate through a coiled optical fiber in opposite directions. After passing through the optical fiber, the two light beams are combined and directed onto a photodetector. One of the light beams is phase-modulated in a phase-modulator before entering the optical fiber. The modulation frequency is f.sub.m. The output signal of the photodetector is fed to a variable-gain amplifier whose output signal is separated into a signal of frequency f.sub.m and a signal of frequency 2f.sub.m. The rotation rate is derived from the signal of frequency f.sub.m. The signal of frequency 2f.sub.m is applied to a detector whose output is fed to an operational amplifier. The other signal applied to the operational amplifier is a reference signal of amplitude U.sub.R. The operational amplifier controls the gain of the variable-gain amplifier in such a way that the output signal of the detector has the same amplitude as the reference signal U.sub.R.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.