Optical sensor having stationary co-terminus ends of the input and output optical fibres
US4861980A · kind A · utility
2Cited by
8References
8Claims
0Family size
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Key dates
| Filing date | Dec 10, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Dec 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectral filtering optical sensor comprises a stationary zone plate and stationary co-terminous ends of input and output fibres with the interposition in the optical path between the zone plate and the optical fibre ends of a variable optical focussing arrangement the focussing characteristics of which change with changes in magnitude of the particular parameter being sensed and thereby vary the effective optical path length between the zone plate and the optical fibre ends and the wavelength of light impinging on the end of the output fibre.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.