Communications: electrical – Continuously variable indicating – With meter reading
Patent
1985-08-29
1988-01-05
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
455606, 455613, 455601, 34082572, H04Q 900, G02F 100, H04B 900
Patent
active
047179139
ABSTRACT:
A data telemetry system for process control includes a point transponder adapted to receive digitally coded infrared interrogation signals. The transponder includes a first group of positive, intrinsic, negative (PIN) diodes disposed thereon for omnidirectionally detecting interrogation signals and a second group of infrared emitting diodes for generating digitally coded signals responsive to the interrogation signals. The first group and the second group of diodes define a first array of diode nodes, each node including at least one diode from each group. A transceiver includes a generally hemispherical, omnidirectional transmitting and receiving member having a third group of infrared emitting diodes disposed thereon for generating the interrogation signals and a fourth group of PIN diodes for receiving the responsive signals from the transponder. The third and fourth groups define a second array of diode nodes, each node including at least one diode from each other. The interrogation signals received at the transponder and responsive signals received at the transceiver are formed at least in part of diffuse infrared light.
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patent: 4495655 (1985-01-01), Benson et al.
patent: 4551710 (1985-11-01), Troup et al.
"Digital Control with Infrared Light", Machine Design, Nov. 6, 1980, pp. 73-78.
Linear I.C. Handbook, by Plessey Semiconductors of Irvine, Calif., May 1982, pp. 85-87, 89-92 and 359-362.
Optodata Data Sheet, 5010 Series", by Scientific Radiation Corporation of Mountain View, Calif., 1980.
Gerasimow Alexander M.
Johnson Service Company
Shupe Larry L.
Smith Ralph E.
Weldon Ulysses
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