Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1979-05-04
1980-07-01
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
73723, 128634, 128673, 128748, G01L 708, G01L 900
Patent
active
042100291
ABSTRACT:
A differential sensor unit precisely monitors ambient pressure within a confined space, such as blood pressure or intracranial pressure of a human patient, utilizing fiber optic light guides. Three light guides pass within a pneumatic line into one end of a rigid cylindrical envelope which may be inserted into a vein or artery or implanted in the skull. The other end of the envelope is bounded by a flexible membrane. Of the external ends of the guides, one faces a light source and each of the others faces a light detector. A reflective surface is attached to the internal face of the flexible membrane. Within the envelope the internal ends of the light guides face the reflective surface and are arranged to respond to movement of the flexible membrane due to differential pressure change across the membrane so that motion of the reflective surface relative to the internal ends varies the light transmitted from the first light guide to the others and consequently varies the light intensity sensed by each detector. The detectors can be arranged to actuate pressure display and pneumatic controls acting through the pneumatic line to adjust the internal pressure of the envelope to match the surrounding pressure and thereby measure that pressure.
REFERENCES:
patent: 3503116 (1970-03-01), Strack
patent: 3580082 (1971-05-01), Strack
patent: 3686958 (1972-08-01), Porter et al.
patent: 3789667 (1974-02-01), Porter et al.
Hulbert W. R.
Lad Research Industries, Inc.
Woodiel Donald O.
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