Photo-elastic sensor
US4668085A · kind A · utility
8Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1985 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Apr 25, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0131
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Certain materials (e.g. polymers, glasses) exhibit the photo-elastic effect, whereby when they are subject to stress become birefringent, which influences a light beam passing through the glass. This beam, e.g. from a laser is collimated and circularly polarized as it approaches the glass and is again polarized as it leaves the glass. This stress is applied, according to this invention, by magnetostrictive strips on the glass which are influenced, by the magnetic field to be measured or the AC bias field. A miniaturized arrangement using this principle is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.