作者：张天宇, 贾方秀, 周强, 李浩

作者单位：南京理工大学 智能弹药技术国防重点学科实验室, 江苏 南京 210094

关键词：位置敏感探测器;窄脉冲信号处理;自动增益控制电路;峰值检测电路;FPGA

摘要：

为实现对入射光斑位置坐标的精确测量，设计以FPGA为核心的二维PSD信号处理系统。针对窄脉冲激光照射下前置放大放电路，建立相应等效噪声模型，引入频率对电路输出电压噪声的影响得到提高电路分辨率措施。搭建自动增益控制电路，并结合FPGA给出的相应增益控制策略实现对幅值大动态范围变化的光电流合理放大。设计峰值脉冲检测电路实现窄脉冲信号峰值的准确测量，其测量误差小于3%。通过FPGA设计状态机实现A/D芯片模式配置和数据读取，并搭建相应坐标解算模块和串口模块，实现入射光斑坐标的解算与传输。实验表明该系统测量非线性度小于10 μm，测量精度高。

Design of two-dimensional PSD signal processing system based on FPGA
ZHANG Tianyu, JIA Fangxiu, ZHOU Qiang, LI Hao
ZNDY of Ministerial Key Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract: In order to realize the precision measurement of the incident spot coordinates,the two-dimensional PSD signal processing system based on FPGA was designed.The noise model of amplifier circuit under the narrow pulse laser irradiation was established and the effect of frequency on the output voltage noise was introduced to improve the resolution of the circuit.The large dynamic range photocurrent was amplified by the AGC circuit according to the gain control strategy and the peak value of pulse signal was detected by the peak detection circuit and the error is less than 3%.The A/D chip configuration and data reading were realized by the state machine of FPGA and the coordinate solving model and the UART model was also established to realize the solution and transmission of the incident spot coordinates. Experiment shows that nonlinearity of system is less than 10 μm.
Keywords: PSD;narrow pulse signal processing;AGC;peak detection circuit;FPGA
2019, 45(8):135-139  收稿日期: 2018-07-17;收到修改稿日期: 2018-08-21
基金项目: 国家自然科学基金（61201391）
作者简介: 张天宇(1994-),男,山东德州市人,硕士研究生,专业方向为机械电子
参考文献
[1] 黄梅珍.位置敏感探测器的研究[D].杭州:浙江大学, 2001.
[2] 段洁,孙向阳,蔡敬海,等. PSD在激光位移检测系统中的应用研究[J].红外与激光工程, 2007, 36(S1):281-284
[3] 王飞.近距离光电测距技术的研究[D].太原:中北大学, 2013.
[4] 刘振亚,高敏.全捷联激光制导弹药双透镜滚转角测量方法[J].激光与红外, 2018, 48(2):164-168
[5] 江孝国,李洪,杨兴林,等.位置敏感探测器测量电路噪声分析[J].信息与电子工程, 2010, 8(1):96-100
[6] 刘媛,赵美蓉,宋乐,等. PSD测距电路降噪方法[J].激光与红外, 2012, 42(9):1026-1030
[7] 吴丽雄,黄玉珠.改进二维光电位置传感器及线性度实验研究[J].中国测试, 2006, 32(2):142-144
[8] 杨海马,傅思勇,王建宇,等.基于FPGA的PSD多路光电数据采集系统设计[J].仪表技术与传感器, 2012(8):48-50
[9] 史狄,孙利群,章恩耀.基于TMS320F2812的二维PSD信号处理系统的设计[J].仪表技术与传感器, 2013(4):35-36,40
[10] 贾天祥,徐熙平,董文博.二维位置敏感探测器(PSD)自动测试系统[J].仪表技术与传感器, 2012(10):67-69
[11] NARAYANAN C, BUCKMAN A B,BUSH V. Noise analysis for position-sensitive detectors[J]. IEEE Trans. Instrum. Meas, 1997, 46(5):1137-1144
[12] 刘小林,王拥军.微弱红外光信号检测放大电路噪声分析及噪声匹配的研究[J].软件, 2012, 33(10):38-41
[13] 刘树棠,朱茂林,荣玫.基于运算放大器和模拟集成电路的电路设计[M].西安:西安交通大学出版社, 2009:280-281.