Hi ,
Can anyone tell me a IR sensor or a logic which gives an output voltage propotional to the intensity of the incident radiation.
My transmitter is a 940nm IR LED. And i have tried many sensors like TSOP 78xx , but here it detects the radiation. The output merely says if the IR radiation is present or absent.
The basic block is as follows :
IR Transmitter -> Sample -> IR receiver -> Signal processing
The Sample is an medium which has peak absorbance at 940nm. Hence the source is IR radiation.
I have tried some alternatives like capturing the image by digital camera.., but i would like to have a simple measurement.
regards partha