He taiaho OPO whakahuri Q-whakawhiti hiko me te punaha whakahaere ara iahiko puku i roto, 1570nm roangaru, 1~20hz (whakaritea) te reeti tukuruatanga, he taiaho iti me te maamaa ka taea te puna marama pai mo te tawhiti tawhiti. auau teitei( 20Hz ) me te hangarau whakaahuru photoelectric.