Electrons released in a detector (often a CCD) by the action of the thermal energy of the body of the detector.
An omnipresent signal in a CCD that is caused by the thermal energy of the electrons being able to break away from the CCD structure and become free to move through the silicon in just the same way as electrons generated in the CCD by incident light photons.
Continuous current flowing through rods and cones in the retina. In the dark, the membrane potential is low (-30 mV); in light, membrane resistance increases, so current declines.
The electronic signal generated by the thermal characteristics of the CCD even in the absence of impinging light.
In a photodetector, the current that flows in the absence of light.
The external current that, under specified biasing conditions, flows in a photodetector when there is no incident radiation.
Thermodynamic noise in a charged coupled device.
Astronomical CCDs are so sensitive that they can detect electronic noise generated by the CCD chip itself. The amount of noise created by the CCD chip is known as Dark Current. Dark current is a function of temperature and cooling the CCD chip can remove much of the noise. However, not all noise is eliminated and so imagers rely on Dark Frames to remove much of the remaining noise.
The signal from the output of the multiplier in the absence of any input signal.
Leakage signal from a CCD sensor in the absence of incident light.
the signal charge that the pixel collects in the absence of light divided by the integration time. Dark current is temperature-sensitive and typically normalized by area (for example, picoamps divided by centimeters squared). Junction leakage current and kTC noise are the sources of dark current, which varies with time and from pixel to pixel.
the current that flows in a photo sensor when there is no incident radiation. Often temperature dependent
The current through a photodiode when a specific reverse bias voltage is applied, with no incident radiant power. Also referred to as Reverse Current.
The inherent electronic current in CCD devices. The dark current, when amplified causes noise. Noise is similar to the snowy image one might see when viewing a bad television transmission.
a.k.a. noise, dark noise. Pixels collect signal-charges in the absence of light over time, which can vary from pixel to pixel, and the result is known as dark current. PowerShot digital cameras reduce or eliminate dark current before a picture is captured.
Thermal current produced in an operating photodetector device when no optical radiation impinges on the detector.
(1) In the absence of light, charge accumulated in a well. (2) The background current that flows in a photodetector such as an image intensifier, VIDICON, or CCD. Usually it can be eliminated, when required, by cooling the photodetector's primary image pickup surface such as the photoconductor or photocathode. Also called thermally generated charge.
Is also know as Black Noise, is the signal charge the pixel develops in the absence of light. This charge is temperature sensitive, and normal in electrical image sensing devices.
The reverse current through a photo-detector with no active light input.
(1) The charge accumulated within a well, in the absence of light. (2) The background current that flows in a charge-coupled device or image intensifier of a camera system. Cooling the photodetector's primary imaging surface (i.e., the CCD's photoconductor or the image intensifier's photocathode) can reduce or eliminate dark current. Also called thermally generated charge.
The induced current that exists in a reversed biased photodiode in the absence of incident optical power. It is better understood to be caused by the shunt resistance of the photodiode. A bias voltage across the diode (and the shunt resistance) causes current to flow in the absence of light. (Shunt resistance is Rb in the illustration.)
Dark current is the constant response exhibited by a receptor of radiation during periods when it is not actively being exposed to light.