高能同步辐射光源X射线位置探测器前端采集电路的研制

Research on X-ray beam position monitor front-end acquisition circuit of high energy photo source

  • 摘要: X射线位置探测器(XBPM)可用于光束线同步辐射光位置的测量,其中XBPM前端采集电路主要用于模拟信号采集与处理。为满足高能同步辐射光源(HEPS)光束线前端区对精确测量同步光位置信息的需求,研制了一款XBPM电子学模拟前端板卡(AFE),设计并实现了XBPM信号的电流电压转换、量程切换、增益控制和ADC采样等功能,并搭建实验室测试平台对XBPM-AFE进行了性能测试。测试结果表明,I/V转换模块电流输入范围为10 nA至1 mA,输入电流在三个数量级变化时,各量程段跨阻增益线性误差均保持在较低水准;四个通道之间测量结果的平均相对标准偏差小于0.46%;模数转换模块在慢采集和快采集两种模式下,分别可以准确地反映变化速度在0.1 s和1 ms以上的信号输入情况。

     

    Abstract: The X-ray beam position monitor (XBPM) can be used to measure the position of beamline synchrotron radiation light. The front-end acquisition circuit of XBPM is mainly used for analog signal acquisition and processing. To meet the demand for precise measurement of synchrotron light position information in the beamline front-end area of high energy photo source (HEPS), an XBPM electronic analog front end (AFE) board card has been developed in this paper. The functions such as current-voltage conversion, range switching, gain control and ADC sampling of XBPM signals were designed and implemented, and a laboratory test platform was built to conduct performance tests on XBPM-AFE. The test results show that the current input range of the I/V conversion module is from 10 nA to 1 mA. When the input current varies by three orders of magnitude, the linear error of the transimmer gain in each range segment remains at a relatively low level. The average relative standard deviation of the measurement results among the four channels is less than 0.46%. The analog-to-digital conversion module can accurately reflect the signal input conditions with changing speeds of over 0.1 s and 1 ms respectively in both slow acquisition and fast acquisition modes.

     

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