Communications: electrical – Continuously variable indicating – Via radiant energy beam
Patent
1991-08-06
1993-08-31
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
Via radiant energy beam
34087002, 34087028, 324 96, 25023113, G08C 1916
Patent
active
052413063
ABSTRACT:
A method and system for accurate remote reading of an electricity meter including an optical detection arrangement, including a light emitter and sensor, have positioned in the light path therebetween a cutout portion of the meter shaft. Rotation of the shaft affects the amount of light passed to the sensor. Registration errors which may occur in a linear transition operating range are avoided by provision of detector threshold hysteresis. A microprocessor sets timing pulses for emitter energization, establishes a detection period of uniform length of time for each energizing pulse and produces, during each detection period, a digital signal having a logic level indicative of the presence or absence of light transmitted to said sensor, whereby a correlation between light transitions and power usage can be made. Accuracy of detection is improved under microprocessor control by introducing hysteresis in the delay between emitter energization and detection, in the voltage threshold in a comparator connected to the detection circuit, or in emitter energization driving current. The hysteresis is determined in accordance with the memorized state of the last previous detected signal.
REFERENCES:
patent: 4137451 (1979-01-01), Einolf, Jr.
patent: 4327362 (1982-04-01), Hoss
patent: 4827123 (1989-05-01), Gray
patent: 5089771 (1992-02-01), Tanguay et al.
Asman Sanford J.
Horabik Michael
Schlumberger Industries Inc.
Yusko Donald J.
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