dark current


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dark current

n.
Unwanted current or signal in a photodetector in the absence of incident light, resulting from thermally excited electrons or leakage of current along the current path.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

dark current

n
(Electrical Engineering) the residual current produced by a photoelectric device when not illuminated
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The vast canopy of woods spread itself to the margin of the river, overhanging the water, and shadowing its dark current with a deeper hue.
Toby led us to the very edge of this, and there stood whining, looking out on the dark current beyond.
A thermoelectric cooler (TEC) cools the CCD array, reducing the dark current, improving the signal-to-noise ratio, and enhancing the dynamic range and low light level detection limit.
Dark current can be kept below 100 nA, which provides high accuracy at low light levels.
A standard part of the processing of spacecraft vidicon images is therefore to subtract this variation, called a "dark current." The change is often a small one, making little difference except to images of extremely faint features.
In a UV photodetector, large Schottky barrier height at metal semiconductor interface results in improved responsivity and improved photocurrent to dark current ratio [33, 34].
Typical responsivity is at 0.44 A/W with typical reverse dark current at 5 nA and total capacitance, typically at 25 pF.
The chip has anti-blooming protection (to prevent streaks on bright stars), high sensitivity, and low dark current, which is further reduced by a regulated, two-stage thermoelectric cooler that can bring the chip to as much as 35[degrees] C below ambient air temperature.
In addition to its large active area and high speed, the photodiode offers a low breakdown voltage between 40 to 60 V, low capacitance of typically 1.5 pF, and low dark current of typically 150 nA.
According to the company, EP reduces dark current and noise, and reduces lens shading effects to offer breakthrough low-light CMOS sensor performance that rivals CCD sensors.