Quadratic frequency modulated absolute distance measuring interferometry
US4886363A · kind A · utility
25Cited by
10References
6Claims
0Family size
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Key dates
| Filing date | Sep 6, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Sep 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B2290/70
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a frequency modulated absolute distance measurement interferometer, distance to a test object is determined by quadratically modulating the frequency of a laser beam, and detecting the rate of change of a beat frequency produced at the output of the interferometer, thereby enabling the measurement to a moving test object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.