Optical pressure sensor
US4368645A · kind A · utility
48Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1980 |
| Grant date | Jan 18, 1983 |
| Priority date | — |
| Expiry date | Sep 26, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for sensing pressure features an electrically passive sensing head connected to electrically active components by a fiber optic cable. A preferred embodiment combines a polariscope bracketing a quarter wave plate and a photoelastic medium. The dependence of the intensities of two polarization components of light emerging from the photoelastic medium on the pressure applied to the medium permits the measurement of that pressure in a manner that has quadratic error dependence on optical misalignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.