小型智能程控SiPM电源设计与验证  

Design and verification of small intelligent programmable SiPM power supply

作　　者：侯会良 黄跃峰[1] 程懋松[1] 戴志敏[1] HOU Huiliang;HUANG Yuefeng;CHENG Maosong;DAI Zhimin(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2020年第6期82-86,共5页Nuclear Techniques

基　　金：国家自然科学基金(No.11775290)资助。

摘　　要：硅光电倍增器(Silicon Photomultiplier,SiPM)作为一种新型光电转换器件,具有增益高(106量级)、功耗低(工作电流在μA量级)、体积小(mm量级)、工作电压低(小于100 V)等优点,相对于传统光电倍增管不受磁场影响。但SiPM存在增益受温度影响大的缺点,温度每上升10℃增益约下降5×105,对于能谱测量和辐射成像应用会产生较大影响。为此,研发了一款小型带电压补偿功能的SiPM专用高压电源模块,并使用能谱测试系统对SiPM的增益特性进行测试。通过不同温度条件下241Amγ能谱中全能峰峰位的对比,验证了电压补偿对于稳定SiPM增益的效果,从5℃到40℃最大增益漂移由补偿前的87.3%下降到了2.76%。这种增益漂移校正有助于拓宽SiPM的应用范围。[Background] As a new solid-state photosensor, silicon photomultiplier(SiPM) has high gain(106), low power consumption(supply current is several μA), small size(several square milimeters), low operating voltage(less than 100 V) and other advantages. Compared with traditional photomultiplier tube, SiPM does not affected by magnetic fields. However, there is a disadvantage that the gain of SiPM is greatly affected by temperature, the gain will decrease by about 5×105 for every 10 ℃ rise in temperature, which will have a greater impact on energy spectrum measurement and radiation imaging applications. [Purpose] This study aims to design and develop a small programmable SiPM power supply for temperature independent gain. [Methods] First of all, a high-voltage power supply module was designed for SiPM, making use of the gain regulation by voltage. Temperature sensor, DC-DC power chip, etc., were integrated into an ARM-based micro control unit(MCU) module for automatic SiPM power supply. Then the effect of voltage compensation to gain in the temperature range of 5 ℃ to 40 ℃ was verified by using digital multi-channel analyzer with comparison of the channels of full energy peak on the energy spectrum of241 Am source. [Results] The channel of full energy peak which indicates the gain of the SiPM is stable by using the voltage compensation(gain drift correction), and the maximum drift of the SiPM gain from 5 ℃ to 40 ℃ decreases from 87.3% before compensation to 2.76%. [Conclusions] Gain drift correction achieved by a small intelligent programmable SiPM power supply broadens the scope of SiPM application.

关 键 词：硅光电倍增器 增益漂移校正 Γ能谱 

分 类 号：TM914[电气工程—电力电子与电力传动]