Device for measuring a nonreciprocal phase shift produced in a closed-loop interferometer
US4705399A · kind A · utility
31Cited by
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5Claims
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Key dates
| Filing date | Mar 3, 1987 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Mar 3, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/726
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The device for measuring a nonreciprocal phase shift involves phase modulation of countercirculating waves in a closed-loop interferometer by means of a reciprocal-effect phase modulator. The modulating signal is a periodic signal having a period 2t.sub.o, where t.sub.o is the transit time of an electromagnetic wave in the closed loop. A digital phase ramp generated in the form of a stair-step signal is combined with the phase-modulating signals and applied as feedback. In an additional embodiment, control circuits are provided for correcting the modulation scale factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.