PHOTOCELLS_MONITOR_DEWPOINT_ON_METALLIC_MIRROR

Published:2009/7/20 11:08:00 Author:Jessie | From:SeekIC

Two photocells in bridge circuit develop error signal for bang-bang servo that uses power flip-flop to turn heater H of metallic mirror on and off, to maintain constant-thickness film of dew or frost on mirror. Two-transistor chopper and a-c amplifier eliminate drift problems.-H. It. Farrah and P. E. Sherr, New Approach to Weather Data: Every Plane a Station, Electronics, 36:28, p 38-41.



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