dark current
Technical term in physics and electronics: the small electric current that flows through a photosensitive device even when no light is present.
暗電流は、光検出器のノイズの原因の一つです。
Dark current is one of the causes of noise in photodetectors.
このセンサーは暗電流が非常に低い。
This sensor has very low dark current.
Compound of 暗 (an, 'dark') + 電流 (denryū, 'electric current'). A calque of English 'dark current'.