Fiber optical measuring device with a frequency sensitive transducer
US4493995A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1982 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | May 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a fiber optical measuring device for measuring physical quantities such as temperature and pressure, comprising a measuring transducer comprising a sensor material, an electronic unit comprising an evaluating electronic system, light sources and photo-detectors, and one or more optical fibers which connect said transducer to said electronic unit. The invention is characterised in that the sensor material has optical properties dependent on the modulating frequency of the light, such as absorption, reflection or luminescence; that the light from the electronic unit is arranged to be modulated by one or more frequencies; that at least one of these frequencies lies within the frequency range where the optical properties of the sensor material are influenced by at least one of said physical quantities; and that the modulating amplitude and/or the modulating phase position of the light emanating from the sensor material is/are arranged to be detected in the electronic unit at at least one of said modulating frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.