Optical sensing devices
US4522495A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1983 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Jun 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Optical sensing devices comprising dual chamber apparatii which use signal and reference light beams together with interferometric methods for detection of physical quantities of interest. The signal part of the chamber experiences the effects of a particular physical quantity to be measured which produces variations in the optical length of the light beam by movement of a mirror, thereby modulating that beam in proportion thereto. Concurrently, the reference beam, of equal pathlength, is passed through an adjacent chamber, isolated from such effects. The modulated signal beam and unmodulated reference beam are then combined to form a fringe pattern, the zero and first order fringes which are superimposed on apertures of an optical fibers, which carry the resultant light beams to a photodetectors for converting the optical signals to proportional electrical signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.