INTERFEROMETRIC SIGNAL ANALYSIS WITH MODULATION SWITCHING
Assignee
UNITED TECHNOLOGIES CORPORATION, A CORP. OF DE
Filed
Jun 27, 1990
Granted
Aug 11, 1992
Location
HARTFORD CT US
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Feb 27, 1991
Rescinded
May 29, 1991
Duration
3 months
Inventor
- 1CARL M. FERRAR
Record Details
- Patent number
- US 5137357
- Application
- 07544552
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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