| 单词 | dark current |
| 释义 | > as lemmasdark current dark current n. Electronics the residual electric current flowing in a photoelectric device when there is no incident illumination. ΚΠ 1913 W. F. Schulz in Astrophysical Jrnl. 38 189 By this arrangement the ‘dark current’ could be completely neutralized. 1947 Jrnl. Optical Soc. Amer. 37 424/2 Associated with this component of the dark current is a shot noise resulting from random thermionically emitted electrons. 1989 P. Horowitz & W. Hill Art of Electronics (ed. 2) xv. 998/2 A PMT [= photomultiplier tube] that has seen the light of day, even without power applied, may require 24 hours or more to ‘cool down’ to normal dark-current levels. 2012 PC Pro July 60/1 As the current fluctuates, dark current manifests as uneven smears of colour, sometimes referred to as thermal noise. < as lemmas |
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