一种热电离质谱离子化器电源的研制  

The Development of Power Supply in Thermal Ionization Mass Spectrometry Ionizer

作　　者：吴俊强 刘桂方[1] 郭冬发[1] 李伯平[1] WU Junqiang;LIU Guifang;GUO Dongfa;LI Boping(Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《世界核地质科学》2022年第3期571-577,共7页World Nuclear Geoscience

摘　　要：离子化器电源是热电离质谱仪的关键器件,其核心是在样品离子化后为实现离子推斥的目的在输出电流上悬浮高压。针对热电离质谱仪的自主研制需求,通过对Howland电流源电路进行多路并联改进,实现输出大电流的能力,利用微控制器实现电流的精密可控输出调节,采用高压隔离方式在电流上实现悬浮高压等技术研制了一种离子化器电源。经过测试,该电源输出电流可控且稳定性较好,波动较小。在自主研制的热电离质谱仪上进行系统集成测试,采用Sr标准物质进行实验得出^(88)Sr和^(86)Sr同位素比值为8.3696,相对标准偏差RSD为0.045%,与标准值的相对误差为0.064%,表明设计的离子化器电源输出稳定,可满足热电离质谱仪的需求。同时也能为热电离质谱仪的研制提供技术保障,在热电离质谱仪的设计和应用方面具有一定的参考价值。The ionizer power supply is a key device of the thermal ionization mass spectrometer,and its core lies in the suspension of high voltage on the output current for the purpose of ion repulsion after the sample is ionized.In this paper,in view of the independent development needs of thermal ionization mass spectrometer,a ionizer power supply was developed by multi-channel parallel connection of Howland current source circuit to improve the ability to output large currents,to use microcontrollers to achieve precision controllable output regulation of currents,and to achieve suspended high voltage on current by using high voltage isolation methods.After testing,the output current of this power supply is controllable and stable,and the fluctuation is small.In the self-developed thermal ionization mass spectrometer for system integration testing,the Sr standard substance was used in the experiments and the obtained ^(88)Sr and ^(86)Sr isotope ratio is 8.3696 with the relative standard deviation RSD of 0.045%,and the relative error to the standard value of 0.064%,indicating that the designed ionizer power output is stable,can meet the needs of the thermal ionization mass spectrometer.At the same time,it can also provide technical support for the development of thermal ionization mass spectrometer,and has certain reference value in the design and application of thermal ionization mass spectrometer.

关 键 词：热电离质谱仪 离子化器电源 大电流 悬浮高压 

分 类 号：O657.63[理学—分析化学]