Electronic nose for rapid detection

An electronic nose with a gas exchange system, comprising:

• a gas intake unit, configured to introduce an external gas;
• a detection unit, including a chamber, a circulation conduit, and a detection module, an intake port of the chamber being in fluid communication with the gas intake unit and collectively defining a gas intake channel, the circulation conduit being connected between a discharge port of the chamber and the intake port, the circulation conduit defining a circulation channel, the detection module including a gas sensor device and one or more environmental sensor devices, the gas sensor device being configured to detect gas within the chamber and generate a detection signal responsive to the gas in the chamber, and the environmental sensor devices being configured to detect one or more environmental parameters of the chamber, wherein the circulation channel is configured to deliver a circulating airflow for cleaning the chamber, and the gas intake channel is configured to deliver the external gas to be detected;
• a purification unit disposed within the chamber and positioned such that the circulating airflow passes therethrough, the purification unit including a support, a photocatalyst disposed on the support, and a light-emitting element configured to activate the photocatalyst on the support, wherein the purification unit is configured to convert the circulating airflow into a purified gas flow;
• an evacuation unit connected to the circulation conduit to guide gas from the discharge port of the chamber back to the intake port;
• and
• a control system connected to the detection module and configured to receive the detection signal generated by the detection module, the control system being further configured to obtain gas-related information associated with the external gas based on the detection signal generated in response to the external gas entering the chamber from the gas intake channel.