Pressure responsive encoder
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United States of America Patent
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-
Sep 24, 1991
Grant Date -
N/A
app pub date -
Feb 22, 1988
filing date -
Feb 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure responsive apparatus having an encoded disc provides preselected pressure indication. The apparatus preferably includes a pressure gauge having a Bourdon tube responsive to an external pressure. The Bourdon tube drives a conventional pointer indicator which has mounted thereto the encoded disc. Light is transmitted to the disc by means of fiber optic cables from a remotely positioned oscillator. Light if reflected by the disc at the preselected pressures and transmitted by fiber optic cables to processing circuitry that responds to reflected light signals as generated by the oscillator. To generate these light signals, light emitting diodes form a light source and the light signals are detected by means of phototransistors. For apparatus detecting two preselected pressures, there is a light source/light detector pair for each pressure. The processing circuitry responding to the outputs of the phototransistors generates visual indications of the preselected pressures.
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