Sample introduction device for improving detection sensitivity of ion mobility spectrometry (IMS)

The invention relates to a sample introduction device for improving detection sensitivity of ion mobility spectrometry (IMS) by improving the sample introduction efficiency of the IMS. The device comprises a sample introduction pad, a purging cavity inside the pad, a liner-containing thermal desorption chamber, an connector for the thermal desorption chamber and an ion mobility pipe, a heating rod, a temperature sensor and an external thermal insulation component. The IMS can be directly used for detection for gas phase, liquid phase or solid phase samples. The sample introduction efficiency of the sample is improved, and the sensitivity of the detected sample is improved. Compared with a traditional solenoid valve or a stepping motor sample injector, the sample introduction device has the advantages that the detection sensitivity of the IMS is greatly improved. Compared with a negative ion mode, the sensitivity for testing the TNT sample is 100 times higher, phthalic acid ester is tested in a positive ion mode, and the sensitivity for testing the dibutyl phthalate is 1000 times higher. With the designs of strict sealing structure, carrier gas preheating and the like, the detection repeatability of the tested sample is high, and qualitative and quantitative analysis test of the IMS is promoted.