Electronic nose with gas exchange system

An electronic nose with a gas exchange system, comprising:

• a gas intake unit, including a filter, a first gas intake channel, and a second gas intake channel, wherein the filter is in fluid communication with the first gas intake channel;
• a detection unit, including a chamber and a detection module, wherein the chamber is in fluid communication with the first and second gas intake channels, and the detection module comprises a gas sensor device and one or more environmental sensor devices, the gas sensor device being configured to detect gas in 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 in the chamber;
• an evacuation unit connected to the chamber;
• and
• a processing unit connected to the detection module and configured to receive the detection signal generated by the detection module;
• wherein the electronic nose is configured to perform the following steps:
• Step 1:
• following each standby time period, allowing an external gas to enter the chamber via the second gas intake channel for a detection time period, wherein the detection time period is shorter than the standby time period;
• Step 2:
• repeating Step 1 until the detection signal meets a criterion;
• Step 3:
• when the criterion is met, allowing the external gas, after being filtered by the filter, to enter the chamber via the first gas intake channel continuously until the detection signal and the environmental parameters reach an equilibrium, after which the first gas intake channel is closed;
• and
• Step 4:
• allowing the external gas to enter the chamber via the second gas intake channel and obtaining gas-related information related to the external gas based on the detection signal generated based on the external gas entering the chamber from the second gas intake channel;
• wherein the criterion is that a change in the detection signal generated by the gas sensor device during the detection time period reaches a threshold.