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Full-Text Articles in Physical Sciences and Mathematics
Nonlinear Time Dependence Of Dark Current In Charge-Coupled Devices, Justin Charles Dunlap, Erik Bodegom, Ralf Widenhorn
Nonlinear Time Dependence Of Dark Current In Charge-Coupled Devices, Justin Charles Dunlap, Erik Bodegom, Ralf Widenhorn
Physics Faculty Publications and Presentations
It is generally assumed that charge-coupled device (CCD) imagers produce a linear response of dark current versus exposure time except near saturation. We found a large number of pixels with nonlinear dark current response to exposure time to be present in two scientific CCD imagers. These pixels are found to exhibit distinguishable behavior with other analogous pixels and therefore can be characterized in groupings. Data from two Kodak CCD sensors are presented for exposure times from a few seconds up to two hours. Linear behavior is traditionally taken for granted when carrying out dark current correction and as a result, …
Computational Approach To Dark Current Spectroscopy In Ccds As Complex Systems. Ii. Numerical Analysis Of The Uniqueness Parameters Evaluation, Ionel Tunaru, Ralf Widenhorn, Dan A. Iordache, Erik Bodegom
Computational Approach To Dark Current Spectroscopy In Ccds As Complex Systems. Ii. Numerical Analysis Of The Uniqueness Parameters Evaluation, Ionel Tunaru, Ralf Widenhorn, Dan A. Iordache, Erik Bodegom
Physics Faculty Publications and Presentations
The evaluation of the uniqueness parameters of the temperature dependence in CCDs is difficult to the considerable number of input parameters and to the strongly nonlinear (exponential) theoretical relations. For this reason, the elaborated computer programs are very sensitive to the choice of the zero-order approximations of the effective (Si) energy gap, and of the weights associated to the experimentally determined dark current. The main goal of this work was to study the rather narrow stability domains of the zero-order approximations, which lead to attractors with physical meaning. It was found that the stability domains are surrounded by (usually in …
Dark Current In An Active Pixel Complementary Metal-Oxide-Semiconductor Sensor, Justin Charles Dunlap, William Christian Porter, Erik Bodegom, Ralf Widenhorn
Dark Current In An Active Pixel Complementary Metal-Oxide-Semiconductor Sensor, Justin Charles Dunlap, William Christian Porter, Erik Bodegom, Ralf Widenhorn
Physics Faculty Publications and Presentations
We present an analysis of dark current from a complementary metal?oxide?semiconductor (CMOS) active pixels sensor with global shutter. The presence of two sources of dark current, one within the collection area of the pixel and another within the sense node, present complications to correction of the dark current. The two sources are shown to generate unique and characteristic dark current behavior with respect to varying exposure time, temperature, and/or frame rate. In particular, a pixel with storage time in the sense node will show a dark current dependence on frame rate and the appearance of being a ?stuck pixel? with …