Automatic pathogen-from-expiration detection system and method

An automatic pathogen-from-expiration detection system, comprising:

• a gas pathogen recovery unit;
• a pathogen concentration unit;
• and
• a sample detection unit,
• wherein the gas pathogen recovery unit and the pathogen concentration unit are coupled to realize continuous loading and continuous detection;
• the pathogen concentration unit comprises:
• a microchannel;
• an electrode;
• and
• a filter element,
• the microchannel comprises:
• a concentration channel;
• and
• a sample channel,
• wherein a filter element is provided between the concentration channel and the sample channel;
• the electrode comprises:
• a positive electrode;
• and
• a negative electrode,
• the positive electrode comprises several sub-positive electrodes provided in a spaced array on one side close to the concentration channel, and the negative electrode is provided on one side close to the sample channel;
• a fluctuating voltage greater than zero is applied to a single sub-positive electrode, and the voltage of the sub-positive electrode adjacent thereto alternates with the fluctuating voltage, so that a varying potential difference is formed between the adjacent sub-positive electrodes;
• fa sample formed in the gas pathogen recovery unit flows into the microchannel, and under the action of the electrode, the pathogens in the sample are regionally enriched on the positive electrode side of the concentration channel to form a concentrated sample in the concentration channel;
• and
• the sample detection unit is connected to the concentration channel for detecting pathogens in the concentrated sample.