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
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.
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.