Interferometric sensor and use thereof in an interferometric device
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United States of America Patent
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Jul 16, 1991
Grant Date -
N/A
app pub date -
Jun 1, 1989
filing date -
Jun 3, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Pressure and temperature are sensed with first and second interferometers having beam paths originating at an optical fiber located at a collimating lens focal point. One interferometer includes a deformable membrane having a deformation responsive to the sensed pressure and temperature which cause the membrane position to vary with respect to a face of a glass plate. In the second interferometer the optical path length varies as a function of the sensed temperature. The collimating lens collects optical beams derived from the first and second interferometers and supplies them to the optical fibre. In one embodiment, the interferometers are coaxial and in parallel; in a second embodiment the interferometers are in series.
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