Method for temperature compensation of measuring signals of a fiber-optic sensor
US5945667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1998 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jan 9, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The piezoelectric effect of an optical sensor (6) made from quartz is a function of temperature. Without correcting or compensating measures, this temperature dependence leads to a falsification of the measuring signal if the temperature of the sensor element is not held constant. In order to obtain accurate measurements for variable sensor temperatures T.sub.s, a temperature-corrected measuring signal M is provided in accordance with: EQU M=U13.multidot.(1+.alpha..multidot.(T.sub.0 -T.sub.s)), U13 signifying a control signal, T.sub.0 a prescribable calibration temperature of the sensor (6), and .alpha. the temperature coefficient of the sensor (6). In this case, the sensor temperature (T.sub.s) is calculated in accordance with: EQU T.sub.s =f(K,E(U.sub.Tr)), K being a contrast parameter which is calculated from light power signals (U1, U2), is a function of the sensor temperature (T.sub.s) and is proportional to the interference contrast, and U.sub.Tr signifying a signal receiver temperature signal and T.sub.r signifying a signal receiver temperature. The contrast parameter (K) is arrived at by virtue of the fact that an oscillator signal (U.sub.HF) of prescribable amplitude is su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.