介绍了自行研制的基于叠型场线性离子阱的便携式质谱仪结构,以及初步的应用测试.该质谱仪的质量分析器采用叠型场线性离子阱,离子源采用辉光放电电子轰击电离源和介质阻挡放电离子源.仪器重10 kg,功耗低于100 W,体积33 cm× 20 cm×20 cm,可以对气体、固体和液体进行检测.挥发性有机气体通过膜进样接口实现大气压直接进样,采用内置的辉光放电电子轰击电离源对其电离.介质阻挡放电离子源作为大气压离子源,通过非连续大气压接口实现质谱的大体积进样,及对枪击残留物DDU和去痛片等的快速检测.%The structure and application testing of a home-made portable mass spectrometer based on step-like electrode linear ion trap was introduced. The analyzer is step-like electrode linear ion trap, and the ion source is glow discharge electron impact ionization (GDEI) source and dielectric barrier discharge ionization (DBDI) source. The device is 10 kg weight,consuming less than 100 W, 33 cm in length, 20 cm in width and 20 cm in height,which can detect gas, solid and liquid. Volatile organic gases injected in the vacuum chamber from the membrane inlet interface, and ionized by GDEI. A discontinuous atmospheric pressure interface was assembled, with which atmospheric pressure ionization source was selected. By a DBDI source, the DDU and compound aminopyrine tablets was detected successfully and quickly.
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