Stabilized local oscillator frequency for heterodyne laser sensors
US5164948A · kind A · utility
2Cited by
6References
2Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 3, 1991 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Jan 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4917
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stabilized local oscillator frequency for heterodyne laser sensors comped of an acousto-optic crystal which provides a constant frequency offset f.sub.1, to a portion of laser transmitter power at frequency f.sub.0, for injection locking a separate local oscillator connected to a detector which simultaneously mixes f.sub.1 with the return signal f.sub.0 from a target. The detector outputs the difference frequency between f.sub.0 -f.sub.1 which is processed for the desired information. Proper local oscillator tuning is maintained through the use of a piezo-electric translator regulating the axial length of the local oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.