Fiber optic pressure sensor systems
US5275053A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1991 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Aug 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is related to numerous improvements for fiber optic measuring systems, and principally those utilizing a deformable diaphragm for sensing pressure. One aspect of the invention is providing temperature compensation for diaphragm characteristics. Temperature measurement can be achieved by using a light signal having a wavelength distribution which overlaps the cut-off characteristics of a filter positioned at the fiber sensing end. Shifting in the cut-off characteristic in response to temperature modulates the intensity of the reflected back temperature compensation signal. In another approach, temperature is measured through its differential effect on light signals having different launching conditions. With either approach, the temperature measurement is used to calibrate the output of the pressure sensitive diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.