Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1983-04-29
1985-06-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
455612, H04B 900
Patent
active
045230994
ABSTRACT:
A monitoring system is disclosed in which fiber-optic cables are used with sensors, e.g., a temperature sensor, to transmit analog data from the sensors in binary form to a receiver. The binary information is then analyzed by a microprocessor, which is attached to the receiver, to monitor the system. The purpose of the fiber-optic cables is to ensure the isolation of the transmitted data from surrounding electrical noise and natural phenomena. That noise tends to distort the transmittal of such sensor data in prior systems which use hard wires instead of fiber-optic cables. Unlike prior systems in which a fiber-optic light source known as an "L.E.D." (light-emitting diode) is normally kept "on", the main feature of this system is that its L.E.D. is normally kept "off" and is turned "on" only when information is desired. This greatly increases the life of the L.E.D., which is important when the system is used in remote places, such as satellites, where an electrician is not available to replace a burned-out diode.
REFERENCES:
patent: 3488586 (1970-01-01), Watrous et al.
patent: 4161651 (1979-07-01), Sano et al.
patent: 4211929 (1980-07-01), Tamburelli
patent: 4215269 (1980-07-01), Kuhn
patent: 4420842 (1983-12-01), Kuhn
Holland Donald S.
Westin Edward P.
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