Electronic nose for detecting indoor air quality

Abstract

The invention discloses an electronic nose for detecting indoor air quality. The electronic nose mainly comprises a nose frame, a shell, a suction fan, HEPA (High Efficiency Particulate Air) filter paper, a nasal cavity, a gas sensor array and a processing circuit integration module thereof, a DSP (digital signal processor), a human-computer interaction interface, a harmful gas absorption and purification device and the like. The electronic nose is characterized in that indoor air to be detected is sucked into the nasal cavity by the suction fan through the HEPA filter paper to perform a full reaction with the gas sensor array; the measurement and identification of harmful gases in the air are completed inside the nasal cavity; then the harmful gas absorption and purification device is used for absorbing and purifying harmful gases with high concentration. The electronic nose has the characteristics of small size, anti-interference, quickness, accuracy, secondary pollution prevention and the like, and is suitable for detecting the harmful gases in the indoor air.

Description

technical field [0001] The invention relates to an electronic nose for indoor air quality in the field of environmental monitoring, in particular to an electronic nose for indoor harmful gas detection, identification and judgment, and alarm processing. It belongs to the field of gas monitoring and pattern recognition, and is suitable for air quality detection and purification control in relatively closed environments such as ordinary homes, studios, computer rooms, and cars. Background technique [0002] With the continuous development of industrial enterprises, various pollutants are entrained in the air to varying degrees. Usually in the open and naturally ventilated outdoors, the pollutants in the air have relatively little impact on people's health. However, with the improvement of people's living conditions, interior decoration is universal, and decoration materials such as stone, chemical wallpaper, carpets, paints, coatings, etc., are not environmentally friendly enou...

AI Technical Summary

Problems solved by technology

[0005] The existing harmful gas electronic nose has a single detection target and needs to work online. The system is huge, expensive, and the test cost is high. The application in air quality detection is still immature and needs to be further improved. An air quality monitoring system and monitoring method based on electronic nose technology, proposed to use the virtual resistance method to solve the discrete problem of metal oxide sensors, but did not consider the miniaturization of the overall structure of the electronic nose; Chinese invention patent (CN102590335A) discloses a method based on The embedded electronic nose test system and test method for surface acoustic wave (SAW) sensors have the advantage that the test and training process can be carried out directly on the embedded platform, which enhances the portability of the system, but the SAW sensor array used is not sensitive to external disturbances. It is extremely sensitive and is easily disturbed by factors such as temperature, humidity, wind speed, and pressure in the environment. The design does not make relevant compensation for it, which reduces the accuracy of the system, and the processing technology of the SAW sensor is complicated and the cost is high; Chinese invention patent (CN101226166A) published A low-power handheld electronic nose system for on-site inspection was developed, which can work independently from the computer and basically meet the requirements of on-site inspection, but its internal airflow control is complicated, and the influence of dust and other external impurities on the detection accuracy is not considered Eliminate secondary pollution of harmful gases and other issues

Images