Ion mobility spectrometer system

An ion mobility spectrometer system, comprising:

• a gas chromatograph configured to separate compounds and output a sample;
• a first ion mobility spectrometer and a second ion mobility spectrometer, each configured to identify ionized molecules;
• and
• a sample feed device configured to input the sample, the sample feed device comprising:
• an inner chamber;
• a first sample outlet and a second sample outlet for outputting the inputted sample to the first ion mobility spectrometer and the second ion mobility spectrometer, respectively;
• a gas inlet for inputting a sweeping gas into the sample feed device;
• a liner tube disposed in the inner chamber, the first sample outlet and the second sample outlet disposed at both ends of the liner tube, respectively;
• and
• a branch pipe disposed at a middle portion of the liner tube, the gas inlet of the sample feed device disposed at an end of the branch pipe, an output pipe of the gas chromatograph in fluid communication with the liner tube.