System for monitoring environment and monitoring method based on system for monitoring environment

A system for monitoring an environment, used for monitoring concentrations of airborne contaminants in a plurality of process areas in a clean room, the system comprising an air supply device, a sampling device, an analysis device, and a control device, wherein:

• the air supply device is connected to a system sampling pipeline and configured to provide a purge gas and purge the system sampling pipeline by using the purge gas;
• the sampling device comprises the system sampling pipeline and is configured to collect environmental samples from the process areas, the environmental sample comprising air;
• the analysis device is connected to an output end of the system sampling pipeline and configured to analyze the collected environmental sample;
• and
• the control device is configured to control, in a period for a single sampling, a ratio between a time period for purging the system sampling pipeline by using the air supply device and a time period for sampling by using the sampling device to be 1:5;
• wherein the sampling device further comprises a plurality of single sampling pipelines;
• each of the process areas is connected and corresponds to one of the single sampling pipelines, and the single sampling pipelines correspondingly connected to different process areas are different:
• the sampling device further comprises a sampling valve, configured to connect or disconnect the single sampling pipelines and the system sampling pipeline;
• wherein the system further comprises a cleaning pipeline, having a first end configured to introduce a clean dry air and a second end connected to the single sampling pipeline, the sampling valve being further configured to control the single sampling pipeline to connect to the cleaning pipeline;
• and an air inlet pipeline, having one end connected to the first end of the cleaning pipeline and other end configured to introduce the clean dry air;
• the control device is further configured to control, in the period for the single sampling, a ratio between a time period for introducing the clean dry air through the air inlet pipeline and the time period for sampling by using the sampling device to be 1:5.