Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-02-13
1992-08-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73705, 25022721, G01D 534
Patent
active
051381559
ABSTRACT:
A pressure responsive apparatus having a flow-through element provides indications of measured pressure. The apparatus preferably includes a pressure gauge having a flow-through Bourdon tube responsive to an external pressure. The flow-through Bourdon tube drives a conventional pointer indicator and further supports a reflective target that is positioned in response to pressure applied to the Bourdon tube. Light is transmitted to the target by means of fiber optic cables from a remotely positioned oscillator. Light is reflected by the target 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. A reference target is also provided along with a second light source/light detector pair. The processing circuitry responds to the outputs of the phototransistors and generates a controller output by use of a look-up table.
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Meier Harold E.
Nelms David C.
Span Instruments, Inc.
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