低能X射线工业CT小间隔信号采集系统

为克服探测器阵列获取速度慢、重建图像精度低的缺点，并能在低能X射线的小焦点/微焦点CT系统中完成对小型精密复杂器件的检测，研究了低能X射线工业CT的小间隔信号采集系统。系统选取DT公司0.2 mm像素尺寸、高集成度、扫描速度快的X-CARD 0.2-256G为探测器，Altera公司的Cyclone EP1C3T为主控芯片，Intel公司的LXT972A为以太网控制芯片。从数据传输的可靠、稳定、高效率角度出发，用模块化的方法给出了系统的硬件设计，用有限状态机技术完成了系统的逻辑单元设计，并对系统的动态范围进行了测试。测试实验结果表明，系统的动态范围大于4000，能够检测精密器件、准确迅速地完成信号的采集传输，满足实际工业CT对信号采集的要求。

Design of small interval signal acquisition system for low-energy X-ray industrial CT

In order to solve the traditional detectors’ shortcomings of low speed and weak precision, to detect small sophisticated devices, and meet the demand of reconstructed images with high spatial resolution in low-energy X-ray microfocus CT systems, a small interval signal acquisition system is proposed. The system takes X-CARD 0.2-256G as the detector, which is highly integrated with fast scanning speed and only 0.2 mm pixel size, Cyclone EP1C3T as the core logic control module, and LXT972A as the Ethernet chip. The whole hardware and logic designations are described clearly in terms of the performance of reliable, stable and high efficiency. Then the dynamic range of the system is tested. Experimental results show that the proposed system has a dynamic range larger than 4000, can collect and transport the signal quickly and accurately, and can satisfy the requirements of ICT transmission sufficiently.