Photosensitization

Published:2011/5/11 8:37:00 Author:Nicole | Keyword: photosensitization | From:SeekIC

The cadmium sulfide photocell of thyristor trigger circuit is sensitive to the flashing in dark room and it is connected to relaxation oscillator, it leads to the loudspeaker souds out alarm, its alarm frequency increases with the increasing of the light density. When it is no flashing, R2 will be lower than the threshold value after adjusting. When this circuit is used for firelight alarming, it should use cadmium selenide to replace PC1, because cadmium selenide is sensitive to near infrared ray; when this circuit is use to heat alarm, because the spectrum is further expanded to far infrared band, so it should use pbs photocell due to it is sensitive to far infrared ray.



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