Also, their isolation is limited by the leakage currents of the semiconductor devices, and they have a high insertion loss for low level signals. 此外，其隔離受半導體器件漏流的限制，并且對低電平信號具有較高的插入損耗。
When the pest crawls through the electro-optical sensor, it will produce a high level signals and begins to count the pulse signal, the count to the pest's number can be realized. 當蟲(chóng)子通過(guò)光電傳感器時(shí)，光電傳感器輸出高電平信號對脈沖信號進(jìn)行計數，就實(shí)現了對蟲(chóng)子數量的統計。
