dark current


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dark current

[′därk ‚kər·ənt]
(electronics)

dark current

The current that flows in a photodetector when it is not receiving any light. It may increase as the temperature rises.
References in periodicals archive ?
According to the view that this dark current is halakhically disregarded, a person who passes in front of the sensor creates a "radiation current.
If we examine a single CCD exposure, we find that most speckles are associated with dark current (a type of signal generated by thermal electrons in the CCD chip), which increases linearly with the exposure length.
Figure 3 shows a detailed view of the readout channel, which includes a dark current cancellation circuit, switched-capacitor integrator, and sample-and-hold circuit.
Sensors not only counter etaloning, they also boast ~90% peak quantum efficiency and do not increase dark current.
Four-channel non-descanned detectors with higher sensitivity, reduced dark current, and broad spectral range allow for real-time unmixing of closely spaced probes for accurate and high-contrast spectral imaging.
This selective wavelength photodiode has very low dark current, the company says, and uses no optical filters, making it useful in color sensors, fluorescent detection, and medical diagnostics applications.
The sensors are equipped with a third generation multiplexer that reduces the dark current of the device, allowing longer integration times.
These infrared focal plane arrays (FPAs) benefit from cooling to help mitigate dark current in order to boost the signal to noise ratio (SNR) thus increasing performance and effective standoff range.
An appendix contains a MathCAD program for modeling the dark current in the HgCdTe diode for various combinations of vacancies and extrinsic dopants.
After changing all camera parameter values, the calibration process is executed with 99 percent reflectance panel and dark current image.
Designated the 11M5-LT, it exhibits superior sensitivity, dark current and noise stability.
The entrance aperture was then covered with a light-tight shield and the pulses counted for the same interval to subtract the ever-present dark current.