Multiple channel driver for fiber optic coupled sensors and swit

Details Multiple channel driver for fiber optic coupled sensors and swit Multiple channel driver for fiber optic coupled sensors and swit

1994-03-14

1996-07-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022722, 359139, B01J 134

Patent

active

055392016

ABSTRACT:
A multiple channel driver for fiber optic devices includes a source and an associated detector for each channel having processing circuitry and the power for the sources common to all channels. The system includes a master controller which has a precise time base to sequentially access each channel. The master controller is used to coordinate the multiple channels in a selected sequential manner. Synchronization of the channels avoids crosstalk since only one channel is on at a time. Power requirements are reduced since only one source is on at a time. The controller measures the background noise level, and subtracts it from the received signal. If the background noise level is too high, or the received signal too low, the master controller provides a warning. The controller also considers the signal history as an aid in locking onto signals and providing cleaner switching. For example, if a signal has been received at an initial threshold level on a channel, then the next time the channel is monitored the signal will be accepted at a lower threshold level.

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I/O: Smarter and more talkative by Peter Cleaveland I & CS-Dec., 1993.

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