Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1991-08-21
1994-01-04
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
73708, 25022714, 2502311, G01L 900, G01L 1904
Patent
active
052750531
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.
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Vokovich Daniel
Wlodarczyk Marek T.
Fiberoptic Sensor Technologies, Inc.
Woodiel Donald O.
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