Maxwell-Boltzmann distribution depends on temperature the rate at which darkĬurrent appears in a pixel is also expected to depend on temperature.Ī dark frame (also called a dark image) is an image taken with your camera Registering the same as an electron excited by a photon. There is a distribution of energies, though, and occasionally anĮlectron will be high enough energy to jump to the conducting band in the chip, The distribution of electron thermal energies in pixelįollows a Maxwell-Boltzmann distribution in which most electrons have energyĪround $kT$, where $T$ is the temperature of the sensor and $k$ is the BoltzmannĬonstant. Recall that dark current refers to counts (electrons) generated in a pixelīecause an electron in the pixel happens to have enough energy to "break free"Īnd register as a count. Handling overscan and bias for dark framesĬombine calibrated dark images for use in later reduction stepsĬlick here to comment on this section on GitHub (opens in new tab).
Real dark current: noise and other artifacts Non-uniform sensitivity in astronomical detectors
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