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Dark Voltage or Dark Segment

The “Dark Offset” or “Dark Voltage” or “Dark Current” or “The Dark” is the baseline reading from the instrument when there is no light. Dark voltages are almost always a function of instrument temperature. Dark voltages are typically small relative to the dynamic range of a sensor, but are significant when measuring low light levels. Dark voltages may be positive or negative. A dark segment is an interval of readings in a data file that indicate the values that may be used as darks when preprocessing or processing the data.

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