Method and apparatus for detecting and measuring a physical magnitude
US5200796A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1990 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Oct 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B9/0209
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring a physical magnitude by means of an incoherent light source (10), an interferometric sensor (14) modulating the spectrum of the light beam emitted by the source at a characteristic frequency which is a function of the magnitude to be measured, a demodulator interferometer (18), and spectrum analysis means (22) having optical resolution making them insensitive to the modulation frequencies generated by the sensor (14) and the demodulator interferometer (18), and sensitive to the difference therebetween. The invention is particularly applicable for measuring physical magnitudes such as temperature, motion, electric field, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.