基于FPGA与STM32的光幕靶校验仪

Light Screen Target Calibrator Based on FPGA and STM32

摘要:

光幕靶是一种能够对弹丸飞行速度测量的仪器，对光幕靶进行检定与校准是保证其测试数据准确、可靠的必备工作，针对现阶段有关光幕靶校验测试设备中存在操作繁琐复杂、造价高、专用性不强、测量效率低等问题，设计了基于FPGA与STM32的便携式光幕靶校验仪；提出了光幕靶校验仪的总体方案，分析和设计同步检定与异步校准信号，介绍了DDS技术的原理；设计了FPGA、STM32、DA模块硬件电路与光电夹具、串口触摸屏、电池模组，完成了对应芯片与所用器件的选型；在LabVIEW平台完成对FPGA的开发，利用FPGA采用DDS技术通过DA模块实现触发信号的生成，STM32完成数据处理与数据传输，使用串口触摸屏实现人机交互功能，最终由光电夹具输出信号；实验结果表明：该光幕靶校验仪输出信号同步时间一致性误差在330 ns～370 ns之间，异步延时精确度在±0.1 μs以内，具有误差小、精度高、便携轻量等特点，满足光幕靶快速校验的应用需求，为提高光幕靶的装调精度提供技术保证。

Abstract:

Light screen target is an instrument that can measure the flight speed of projectiles. The verification and calibration of the light curtain target is a necessary work to ensure the accuracy and reliability of the test data. In response to the problems of complicated operation, high cost, weak specificity, and low measurement efficiency in the current calibration and testing equipment for light screen targets, a portable light screen target calibration instrument based on FPGA and STM32 has been designed; The overall scheme of the light screen target calibration instrument was proposed, and the synchronous and asynchronous calibration signals were analyzed and designed. The principle of DDS technology was introduced; Designed FPGA, STM32, DA module hardware circuits and optoelectronic fixtures, serial touch screen, battery module, and completed the selection of corresponding chips and devices used; The development of FPGA was completed on the LabVIEW platform, using DDS technology to generate trigger signals through the DA module. STM32 completed data processing and transmission, and a serial touch screen was used to achieve human-machine interaction. Finally, the signal was output by the photoelectric fixture; The experimental results show that the synchronization time consistency error of the output signal of the light screen target calibrator is between 330 ns and 370 ns, and the asynchronous delay accuracy is within ± 0.1 μ s. It has the characteristics of small error, high accuracy, portability and lightweight, meeting the application requirements of fast calibration of light screen targets and providing technical guarantees for improving the installation and adjustment accuracy of light screen targets.