Waxay ka kooban tahay halbeeg ama labanlaabantay afar unug oo isku mid ah Si PIN photodiode oo leh wareegga hore ee cod-weyneysiinta kaas oo awood u siinaya signalka daciifka ah ee hadda jira in la kordhiyo oo loo beddelo signalka korantada si loo gaaro habka beddelka ee kor u qaadista sawirka-photoelectric-signal.