Communications: electrical – Continuously variable indicating – Via radiant energy beam
Patent
1979-08-17
1981-07-28
Groody, James J.
Communications: electrical
Continuously variable indicating
Via radiant energy beam
250205, 250231SE, 34087002, 34087042, G08C 1936, G08C 1916
Patent
active
042813255
ABSTRACT:
A meter pulse initiator is employed to generate signals corresponding to the rotation of the rotor of a watthour meter. Infrared light emitting diodes (IREDs) receive a small steady state driving current and radiate two low intensity beams of radiation that are reflected from the surface of a rotating rotor. A creep hole in the rotor passes beneath one of the beams and transmits the low intensity radiation to an associated phototransistor. A small current is induced in the phototransistor and the current is amplified by a Darlington amplifier. The amplified current is applied to the IRED to increase the intensity of the radiation of the IRED in a positive feedback loop. Component saturation defines a peak driving current and an associated peak radiation intensity for the IRED. As the phototransistor current increases, a capacitor is charged to a threshold voltage and after the creep hole passes the IRED/phototransistor pair, the capacitor discharges. The charge/discharge cycle of the capacitor is detected by a Schmitt trigger that generates a corresponding signal to set a flip-flop. When the creep hole passes beneath the second radiation beam a second signal is generated and is applied to reset the flipflop.
REFERENCES:
patent: 3542479 (1970-11-01), Sibalis
patent: 3631250 (1971-12-01), Van Buskirk
patent: 3725665 (1973-04-01), Talmo
patent: 3755687 (1973-08-01), Garnett
patent: 3846788 (1974-11-01), Calabro et al.
patent: 3944813 (1976-03-01), Fowler
patent: 4086580 (1978-04-01), Schroeder
American Science and Engineering, Inc.
Groody James J.
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