Design And Implementation Of Detection-acquisition-transmission System For Industrial CT Based On USB2.0

Industrial CT (Industrial Computed Tomography) technology is known as the bestnon-destructive testing technology in industrial fields. On one hand, the CT technologyincludes deep-ray physical principles and mathematical theory. It is very necessary forresearchers of science and engineering and radiology medical background to understandand grasp the principle of CT technology. On the other hand, in microelectronics,biotechnology and other fields, object complexity and size miniaturization put forwardhigher requirements to industrial CT image resolution.For the feature of the small number of small micro-focus detector and teaching CT,the short distance of transmission, the small gap of detector, the small volume ofsubsystems and the high speed of control transmission, a test system with acquisition,transmission and integration based on the detection of small interval detector, FPGA,USB2.0bus technology was developed. First, analyzing requirements of the test system,compared to other programs I determined the design of the overall system. Then, I designthe hardware and software parts. The last part is system performance testing and resultsanalysis.Hardware is designed with a set of test boards, including integrated detection,collection and transmission. The detector chip has selected DT linear array detector chipof X-CARD series. Master FPGA collected Altera Cyclone of EP1C6T144C8N. USB2.0transmission interface chip selected Cypress’s EZ-USB FX2LP CY7C68013A. The FPGAhas controlled acquisition timing of the front-end detection, cache data and responded tothe request of the USB host through USB interface chip EZ-FX2LP of CY7C68013A, andprobed acquisition configuration parameters or bulk upload. The CY7C68013A worked inSlave FIFO mode which has made maximize use of USB bandwidth.The software is designed of FPGA digital logic, USB firmware, drivers and PCapplications from the bottom USB devices and top USB host. FPGA digital logic hasadopted top-down thinking, using Verilog HDL programming. USB firmware is based onthe preparation of Cypress provided firmware framework. The drive has used the CyrpessGPD (generic driver). The human-computer interaction process of the host side is writtenin VC++6.0development environment, using multi-threading technology tocommunicate through WIN32API function and the underlying USB driver.The debugging results of the system hardware and software show that system performance is acceptable and the system has achieved the desired goals.