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PRESSURE SENSOR WITH FIBRE-INTEGRATED BRAGG GRATING, COMPRISING AN INTEGRATED TEMPERATURE SENSOR WITH FIBRE-INTEGRATED BRAGG GRATING
PRESSURE SENSOR WITH FIBRE-INTEGRATED BRAGG GRATING, COMPRISING AN INTEGRATED TEMPERATURE SENSOR WITH FIBRE-INTEGRATED BRAGG GRATING
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机译：带有纤维集成布拉格光栅的压力传感器，包括带有纤维集成布拉格光栅的集成温度传感器
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摘要
The subject-matter of the present invention is a wavelength-coded fiber Bragg grating pressure sensor 1 which is suitable, in particular, for use in the case of high pressures and temperatures in oil drill holes. The sensor principle according to the invention is based on the fact that the hydrostatic pressure of a liquid or gaseous medium 11 is converted with the aid of a transducer 1 into a longitudinal fiber elongation or fiber compression. The transducer 1 comprises a measuring or pressure cylinder 7a which exchanges pressure with the medium 11, and a reference cylinder 7b which is shielded from the medium 11 or oppositely pressure-loaded. Temperature-compensated transducers 1 with a temperature-independent Bragg wavelength lambdB can be realized by introducing a suitable temperature dependence of the mechanical prestressing of the pressure sensor fiber 3 by selecting the materials, lengths and arrangements of the fiber holder supports 5a, 5b. A fiber Bragg grating temperature sensor 19, 20 can be provided, in addition. Also specified are transducers 1 with other cylinder arrangements 7a, 7b, and a wavelength-division multiplex configuration with several transducers 1.
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