Laser detector array?

Hi ladies and gentlemen! I am looking to build a proof of concept, then a prototype on a laser detector array. I need a setup that will pick up a laser beam directed at it from up to 200M away. My idea was to use an array of photovoltaic cells hooked up in pattern. When a laser hit one or more of the cells the current would trip a relay that passed the current to a buzzer or alarm. My concern was that sunlight and ambient refection will cause false signals and trip the alarm. I am sure there is a way to set the system up so that the alarm only went off when there was a voltage spike in a single sensor, or put a variable resistor on it so that only light levels above ambient would set it off. The system will be deployed facing down towards the ground so direct sunlight should never hit the array.

I would like to start off with a single photovoltaic cell to prove that the system works and then integrate the others to form the array.

Thanks for the help!

jbaker225 years ago
Maybe the laser tag instructible would help?
iceng5 years ago
Using a pulsed laser will easily differentiate the laser from sunlight and an
AC Op-Amp for gain will work easily for your game.