Ko te taputapu he kōwae photodiode silicon avalanche me nga waeine rite e wha, me te iahiko preamplifier kua hangaia, ka taea te whakanui i te tohu ngoikore o naianei me te huri ki te whakaputanga tohu ngaohiko, me te mohio ki te "whakanui-a-hiko-tohu-tohu" te huringa huringa.