Automatic calibration of electron multiplying CCDs
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United States of America Patent
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Oct 27, 2009
Grant Date -
Jul 27, 2006
app pub date -
Jan 19, 2006
filing date -
Jan 20, 2005
priority date (Note) -
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Abstract
A method of determining the gain of an electron multiplier, especially in an Electron Multiplying Charge Coupled Device (EMCCD). The electron multiplier multiplies, in use, signals received from a device, typically a CCD, comprising photodetectors. A test signal is input to the electron multiplier from the device, and the gain of the electron multiplier is determined from the output of the electron multiplier. The test signal comprises, or is derived from, electrical charge generated by the photodetectors other than as a result of the incidence of an electromagnetic signal on the photodetectors. The test signal comprises, or is derived from, dark current, or clock induced charge.
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