Hi everyone,
I'm designing a laser range finder using the technique of Amplitude Modulated Continuous Wave (AMCW). The range to be mesuared is up to 15 meters. As a photoreceiver, I have the well-known BPW77N phototransistor, but I'm afraid it doesn't have the sensibility enough for detecting light from such a lonf distance. As far as I've read, I'd need an avalanche photodiode (APD) or a built in photodiode-amplifier-filter to do the job. Since these VERY high sensitive components aren't readily available to me (and they might not be cheap !!), I wanted someone to advice me.
Thanks beforehand.