Hi All,
I have the following circuit which is detecting a 1mw 650nm laser pulse of 10Hz from a distance of 250 meters. The receiver has a red filter to reduce ambient light noise. The receiver and the laser are placed on a boundry wall outside in direct sunlight. The problem that I am having is first related to temp. currently the outside temp is 52 degrees C. afer 45 degrees the receiver has problems with latching on to the laser pulse. I changed the inductor from 1mh to 2.2mH 3 Watts and that seemed to work for temps upto 45 degrees. but at temps above that I still have problems. Also with the larger inductor I seem to have noise and range issues. i.e. the range goes down to less than 200 meters.
As I would like to extend the range to approx 700 meters. I will upgrade the transmitter to a 5mw 635nm laser so that should work in theory atleast. I need help in making certain that the receiver can cope with that
Any and all help is appreciated.