Position: Index > Sensor Circuit >

Ambient-light-ignoring-sensor

2014-11-10 19:43  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


A resonance-tuned narrow-band amplifier reduces this optical object detector`s sensitivity to stray light. C1 and L1 in IC2A`s feedback loop cause tbe op amp to pass only those frequencies at or near the LED`s 5-kHz modulation rate.
Ambient-light-ignoring-sensor

IC2B`s output increases when the received signal is sufficient to drop the negative voltage across C2 below the reference set by R2.



Reprinted Url Of This Article:
http://www.next.gr/light-laser-led/light-sensing/ambient-light-ignoring-sensor-l13528.html