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为了精确获取分幅摄影机的拍摄频率和条纹摄影机的扫描速度,必须精确测量转镜在拍摄期间的速度。提出一种基于数字信号处理器(DSP)与现场可编程门阵列(FPGA)相结合的高精度数字测量方法。DSP与FPGA采用高速串行外设接口(SPI)通信,DSP根据转镜转速的变化,自动对FPGA预置适当的时间闸门,FPGA计数缓冲后将测速数据发送给DSP处理,再经DSP串行口发送给计算机进行实时显示。FPGA的逻辑单元采用32位而且预置时间闸门可变,有效防止了数据的溢出,提高了转速的范围和精度;高速DSP提高了数据处理的速度,保证了实时性。系统仿真结果和实际工程使用情况表明此设计是可行的,测速精度可达0.0001%,测速范围为3～3×108r/min。
In order to accurately obtain the shooting speed of a banner camera and the scanning speed of a streak camera, the speed of the mirror must be accurately measured during shooting. A high precision digital measurement method based on digital signal processor (DSP) and field programmable gate array (FPGA) is proposed. DSP and FPGA using high-speed serial peripheral interface (SPI) communication, DSP according to the rotary mirror speed changes automatically pre-set the appropriate FPGA gate time, the FPGA count the buffer speed measurement data sent to the DSP processing, and then by the DSP serial Port sent to the computer for real-time display. FPGA logic unit with 32-bit and preset time gate variable, effectively prevent the data overflow, improve the speed range and accuracy; high-speed DSP to improve data processing speed, to ensure real-time. The results of system simulation and practical engineering shows that this design is feasible, the speed accuracy can reach 0.0001% and the speed range can be 3 ~ 3 × 108r / min.