Dec 9, 2015 #1 E equal 0 Joined Oct 8, 2015 Messages 58 Points 8 Hi, i am searching for a analog sensor to build a simple power meter with a µC. photodiode type or thermo type - no matter i have tried with a BPW21R, but this diode recognize difference between a 20mW and a 60mW Laserpointer. ideas
Hi, i am searching for a analog sensor to build a simple power meter with a µC. photodiode type or thermo type - no matter i have tried with a BPW21R, but this diode recognize difference between a 20mW and a 60mW Laserpointer. ideas
Dec 9, 2015 #2 diachi 0 Joined Feb 22, 2008 Messages 9,700 Points 113 Use a small thermoelectric cooler - that's what most of the DIY LPMs here use, just painted black - can't remember which paint off the top of my head. With a photodiode you need to compensate for different wavelengths, not so much with a TEC.
Use a small thermoelectric cooler - that's what most of the DIY LPMs here use, just painted black - can't remember which paint off the top of my head. With a photodiode you need to compensate for different wavelengths, not so much with a TEC.