The Data Acquisition And Transmission System Development Of The Micro-nano CT Area Array CCD Detector

In recent years,with the expansion of the industrial CT application range,accuracy of CT system needs to improve,especially in the biological structure,material microstructure to reach micron or nanoscale spatial resolution requirements.The high resolution Micro-nano CT is the current research hotspot.High resolution area array detector is the key component of micro nano CT system.The performance of detector directly affects the system index.In this paper,the detector with high resolution array CCD as the core component is studied.The acquisition and transmission system of the detector is developed and designed,and the hardware is made and the corresponding software is designed.The main work and innovation of this paper are as follows:Firstly,the structure and working principle of the surface area array CCD detector for low energy X ray are analyzed.The control scheme and data transmission scheme of the system are studied,and the overall scheme design is completed.Secondly,the parameters and performance of the KAF-8300 area array CCD device satisfying the design requirements are analyzed in detail.The voltage supply circuit,which takes the core of the success rate chip and the discrete device as the core,and the voltage supply circuit with the voltage following circuit and the voltage regulator chip as the core,is designed.The signal conditioning circuit is designed to match the output voltage of the KAF-8300 chip and the input voltage of the A/D chip,and the A/D is analyzed.The function and characteristics of the chip WM8214 and the design of the related circuit are completed;the configuration circuit and peripheral circuit of the FPGA chip are designed;the Camera Link interface technology is studied and the configuration circuit of the Camera Link interface is designed.The characteristics of the NI PCIE-1427 image acquisition card,the method of LabVIEW programming and the display technology of the host computer are studied.Then,according to the driving scheme and the power supply scheme,each module is tested and analyzed and optimized.The core controller of the detector system is from the EP3C5E144I7 model FPGA of ALTERA company.KAF-8300's driving voltage signal timing,A/D chip related double sampling timing and register configuration,Camera Link interface protocol driving timing.The results show that the proposed scheme meets the design requirements.On the basis of the analysis of the working principle of the X-ray detector of the scintillator fiber coupling area array CCD,the design of the detector system and the selection of the core devices are completed in this paper.The driving circuit,A/D conversion circuit,acquisition and transmission circuit,timing circuit hardware design and implementation,software programming and debugging of the area array CCD chip are completed.The experimental results show that the design scheme is reasonable and feasible.At the same time,the Camera Link interface technology and the LabVIEW host computer technology are verified,so that the design of data acquisition and transmission system is more convenient.