Radiation thermometer electricity testing temperature between 100-500℃

Published:2011/4/27 9:14:00 Author:Nicole | Keyword: Radiation thermometer, test temperature | From:SeekIC

This radiation thermometer uses lead sulfide photosensitive resistance 61SV as infrared radiation detector. In order to avoid the surrounding radiation mixing in measured value, so the measured radiationshould bemodulated by 350Hz frequency. Adopting filter which is composed of Ge or silicon to isolate the visible radiation. When the voltage of photosensitive resistance is constant, and the temperature is in the range of 100~500℃, the singal value is changed about 1000 times. The total testing range is divided into 5 grades, using transfer switch S1 and S1' to choose. The whole amplifier circuit is divided into 4 classes. Connecting a bridge rectifier circuit to last stage negative feedback amplifier to change the AC singal into DC singal. The measured value is displayed by moving coil meter(the measuring range is 200μA).



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