共振激发控制技术是提高四极离子阱分辨率、灵敏度,实现其多级质谱分析的关键技术。针对质谱仪小型化趋势,提出基于现场可编程门阵列(filed-programmable gate array,FPGA)软件实现直接数字合成器(direct digital synthesizer,DDS)信号幅度调制的方法,开发出数字式共振激发控制技术,研制出结构更简单的共振激发控制系统。在对性能要求较高的电喷雾离子源-矩形离子阱质谱仪中,应用这套系统实现了单质荷比选择离子、三级质谱分析和600-2000Thomson质荷比范围的全扫描等功能。相比使用模拟技术实现幅度调制的控制单元,数字式共振激发控制单元的功耗只有其10%,系统性能也满足四极离子阱的需求。
This paper describes the method and way for traceability of chemical metrology. The efficieflt primary reference materials were prepared and the reliable analysis method -IDMS was established for transmitting quantity and traceability of chemical metrology, to introduce the results of international cooperation study.