Method for measuring electron gain factor of charge coupled device

The invention discloses a method for measuring the electron gain factor of a charge coupled device. The method comprises the following steps: S1, acquiring and absorbing signal electrons stored on a floating grid capacitor to form reset grid weak current when a reset metal-oxide semiconductor tube of a read amplifier of the charge coupled device is conducted; S2, detecting the reset grid weak current of the reset metal-oxide semiconductor tube on the read amplifier through a nano-ammeter; S3, calculating the sum of average electrons of each pixel on the floating grid capacitor according to the reset grid weak current to detect the electron gain factor of a detected camera. By adopting the method, the problem of increase of the measuring error of the electron gain factor due to non-linear feature of the read amplifier of the charge coupled device and produced read noise is solved. The method is very suitable for measuring the electron gain factor of the charge coupled device in an electron gain calibrating process.