Photo transducer circuit for setting minimum and maximum current

Details Photo transducer circuit for setting minimum and maximum current Photo transducer circuit for setting minimum and maximum current

1983-01-05

1985-08-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250209, 250231P, 307297, 307311, G05F 156, H01J 4014

Patent

active

045380635

ABSTRACT:
A photo transducer circuit (30) selectively controls the current which is transmitted between power terminals (32, 34). A light emitter (20) transmits light to a first photo receiver (24) and a second photo receiver (26). A vane (16) is movable by a Bourdon tube (12) to permit a variable amount of light to pass from the photo emitter (20) to the photo receiver (26). The output of the photo emitter (20) is regulated by a circuit which monitors the output of the photo receiver (24). Circuitry is provided to set a minimum current flow between the power terminals (32, 34) when the vane (16) substantially blocks illumination of the photo receiver (26). Further circuitry is provided to set a maximum current flow between the power terminals (32, 34) when the vane (16) allows substantial exposure of the photo receiver (26) to the light produced by emitter (20). The current passed between the power terminals (32, 34) is proportional to the degree of blockage of the light from the emitter (20) directed toward the photo receiver (26).

REFERENCES:
patent: 3480781 (1969-11-01), Mandalakas
patent: 3675114 (1972-07-01), Nercessian
patent: 3742233 (1973-06-01), Gorgens et al.
patent: 4109147 (1978-08-01), Heske
Honeywell "Diffused Silicon .DELTA.Pl, PP/l Transmitters" 1979-FIG. 2 and accompany text 4-20 mA output.
Beckman "Model 8610 Differential Pressure Transmitter" Dwgs. 641342, 644016 and 643460 4-20 mA output.
Rosemount Dwg. 1151-135 Rev. H-"Differential Pressure Transmitter" 4-20 mA output.

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