Ring laser gyro readout assembly simplification with adjustment capability
US4676643A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1985 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Oct 4, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/662
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A readout apparatus responsive to clockwise and counter-clockwise counter-rotating light beams that have a frequency difference relatable to the rate of rotation of a ring laser gyroscope, the readout apparatus comprising means for removing a portion of the light beams from the ring of the ring laser gyroscope; means for displacing the removed counter rotating beams to overlap a portion of the light of the removed beams to form a first spot beam having fringe motion characterized by an array of co-parallel alternating stripe regions of high and low intensity light within the spot; a mask having an array of co-parallel, rotated, alternating transparent and opaque stripes; the mask being positioned to direct the fringe motion of the spot beam through the mask, the mask array of alternating and opaque stripes being aligned to form a second spot beam having a moire fringe motion characterized by an array of co-parallel alternating stripe regions of high and low intensity light within the spot moving transverse to the fringer motion of the spot beam; means for receiving the second spot beam and for detecting the moire fringe motion within the second spot beam characterized by an array o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.