Fiber-optic quartz voltage sensor
US5475773A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Apr 29, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The sensor comprises at least one quartz body (1) sectioned from a quartz crystal, an optical fiber connected to the quartz body in at least one given length, and means for detecting changes in length of the optical fiber which are caused by piezoelectrically caused changes in shape of the quartz body in an electric field. It is shown how the mostly undesired temperature dependence of the sensor measurement signal can be influenced and, as the case may be, even eliminated in a purely passive manner by a mixture of the two independent piezoelectric coefficients d.sub.11 and d.sub.14 which contribute to the piezoelectrically caused change in dimension of the quartz body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.