Design And Implementation Of High-speed CCD Signal Acquisition And Processing System

With the development of the semiconductor technology and widespread use of the data acquisition system, the requirements of which people pursue the CCD images collection system are increasing day by day. In the traditional CCD images collection system, the phenomenon that the process time of the CCD signal data limits the measurement speed of the system CCD would appear in the recognition and real time and high-speed detection of dynamic target. Adopting the FPGA+DSP Digital Signal Processor, a set of high-speed linear CCD signal acquisition systems are designed in this paper, which can recognize and process in real time the transient optical signals and be used in the study of properties of light-scattering in the rainbow of the small static and dynamic particles.Adopting the modular design, the system is divided into CCD and signal processing board. The CCD timing-driven impulse is designed by the CPLD device; the CCD integration time can be modified by the dial switch for the environment of different light intensity. Using the FPGA + DSP program, the digital signal processing board can complete the rapid collection, storage and processing of the image data by the programmability of complex logic of FPGA and the high-speed digital signal processing of DSP. The principle computer's data transmission interface adopts the program of USB interface transmission and network transmission, and gives full play the advantages of USB, including the plug-and-play, fast transmission, remote access of network transmission, and long-distance transmission. Slave FIFO asynchronous transmission control procedure is programmed on the data transmission between FPGA and USB.In this paper, the hardware circuit design and circuit board making and debug of part of the software of the linear CCD signal acquisition and processing system are finished, which can be initially used in the rainbow measurement experiment aiming at the study of the properties of small particles light-scattering in the rainbow, and can realize the real-time measurement for spatial light intensity distribution of dynamic objectives.