极紫外光子计数成像探测器采集电路的研制

发布时间：2018-05-17 05:29

本文选题：探测器 + 紫外光子　；参考：《激光与光电子学进展》2014年10期

【摘要】：为了使极紫外光子计数成像探测器能够高速采集数据并显示光子位置信息,研制了一款数据采集电路系统。分析了基于感应电荷楔条形位置灵敏阳极光子计数成像探测器的成像原理,选用符合性能要求的模数(A/D)转换芯片,在现场可编程门阵列(FPGA)主控芯片的控制下对去除峰值保持电路模块的模拟信号进行采样和转换。FPGA将接收到的数字信号处理以后通过USB数据传输系统发送给计算机,上位机软件再进行解包、计算和成像等工作,将光子的位置图像显示出来。最后对所成图像的线性度和分辨率进行鉴定。实验结果表明,该电路系统具有最高为2 MHz的采样速度和3路同步采样能力,并且在没有峰值保持电路的情况下采集到的图像仍具有很好的线性度和高达5 lp/mm的空间分辨率。能快捷准确地完成数据采集和绘图成像,满足极紫外探测器对采集电路的性能要求。
[Abstract]:A data acquisition circuit system is developed in order to collect data and display photon position information at high speed. The imaging principle of the position sensitive anode photon counting imaging detector based on the inductive charge wedge is analyzed. The A / D conversion chip which meets the performance requirements is selected. Under the control of field programmable gate array (FPGA) master control chip, the analog signal which removes the peak holding circuit module is sampled and converted. The received digital signal is processed and sent to the computer through the USB data transmission system. The upper computer software is used to unpack, calculate and image the position image of the photon. Finally, the linearity and resolution of the image are identified. The experimental results show that the circuit system has the highest sampling speed of 2 MHz and the ability of three synchronous sampling, and the obtained images still have good linearity and spatial resolution of up to 5 lp/mm without peak holding circuit. It can quickly and accurately complete the data acquisition and mapping imaging, and meet the performance requirements of the extreme ultraviolet detector for the acquisition circuit.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金(61077016)
【分类号】：P111.49

【参考文献】