▎ 摘　　要

NOVELTY - The system has a purification device for removing impurities of obtained measured exhaled gas. An analyzing device uses a high-spectral imaging spectrometer (10) and a graphene sensor (12) to detect the detected exhaled gas after removing impurities in parallel to obtain a lung cancer screening result according to two detection results of parallel detection, where characteristic spectrogram is obtained corresponding to volatile organic compounds (VOCs) gas in the detected gas after removing the impurities. The analyzing device obtains concentration and component type of VOCs gas in measured exhaled gas after removing impurities based on change of graphene conductivity in the graphene sensor. USE - Exhaled gas detection system for screening lung cancer. ADVANTAGE - The system realizes pre-screening and risk assessment of lung cancer widely and conveniently, and ensures detecting VOCs in to-be-tested gas by the high spectrum imaging spectrometer and the graphene sensor in parallel to ensure accurate detection result. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an exhaled gas detection method. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of an exhaled gas detection system for screening lung cancer. Expiratory blowing nozzle (1) Connector (2) Air inlet (3) FIrst connecting pipeline (4) Filter screen (5) Air pump (6) Air inlet valve (7) Second connecting pipeline (8) Stirring fan (9) High spectrum imaging spectrometer (10) Connecting valve (11) Graphene sensor (12) Graphene resistance data processor (13) Third connection pipeline (14) Display screen (15) Exhaust valve (16) Exhaust pipeline (17) Exhaust pump (18)