| 摘要 |
A system for controlling the power of a radiation source comprises a sensor FS, a feedback network FN and a radiation source power control circuit LPCC. The sensor receives a portion of a radiation beam LBP generated by a radiation source LS and provides an analogue signal AFS representative of a radiation source power. The feedback network FN is connected to the sensor FS. The radiation source power control circuit LPCC is connected to the feedback network FN and to the radiation source LS. The feedback network FN comprises a runlength compensating module RCM comprising:-a sampling module SM providing a digital signal DFS based on the analogue signal AFS,-at least one error controlling signal generator ECSG performing an amplitude compensation and providing at least one digital error controlling signal ECS to the radiation source power control circuit LPCC in order to control the power of the radiation source LS.
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