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The industrial CT is used to generate a 3D image of the inside of an object, it consists of an accelerator x-ray source, a detector array and readout electronics. A trigger module collects the position information from three decoders installed all the 3 moving axis of rotation, shift and lift, and generates trigger signal according to the predefined trigger algorithm; the decoder information is also sent to the readout electronics. The SCS (system control station) can remotely communicate with trigger module to change the working modes and parameters during the scan process. The trigger module utilizes an embedded controller board which consists of a PowerPC controller running the Linux operation system to support the TCP socket connection with SCS, and a FPGA connected to the PowerPC local bus acts as a customized peripheral to carry out the trigger logic. With different interface mezzanines and online reloadable firmware, the trigger module has great flexibility to work with different decoders, different readout electronics.
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