Gas analysis device and method for detecting sample gas

A gas analysis device, comprising:

• an ion mobility spectrometer comprising an ion mobility tube, an ion gate, a plurality of electrodes, a suppression grid, and a Faraday plate sequentially disposed in the ion mobility tube, wherein the Faraday plate is configured to receive sample ions discharged from the suppression grid, and the Faraday plate is provided with a through hole;
• a mass spectrometer;
• a gate valve disposed between the Faraday plate and an ion inlet of the mass spectrometer;
• and
• a controller configured to control an opening or closing of the gate valve to allow the sample ions discharged from the suppression grid to flow into the mass spectrometer through the through hole of the Faraday plate when the gate valve is opened;
• wherein the ion mobility spectrometer further comprises:
• an ion source configured to generate initially charged ions;
• a sample input port configured to deliver sample gas into the ion mobility tube;
• and
• an isolation mesh arranged between the ion source and the ion gate to form a charge exchange region between the ion source and the isolation mesh, and an ion enrichment chamber between the isolation mesh and the ion gate.