Laser gyro with dithered mirrors and current dither
US4653919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1983 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jan 31, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser gyro for detecting rates of rotating the gyro having a primary dither means for eliminating lock-in at low rates of rotation and a secondary dither means for eliminating nonlinearities in the gyro output when the input rate is a harmonic of the primary dither frequency. The gyro includes a body having a polygonal shaped cavity therein with a mirror disposed at each of the corners thereof to form a closed loop path for two counter-rotating beams. The primary dither includes means for dithering two mirrors 180.degree. out of phase to maintain the cavity path length constant. The secondary dither includes a current dither for differentially modulating the current in each leg of the gyro to randomly null nonlinearities in the gyro output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.