Sensor for detecting particles in air and manufacturing method of sensor

Abstract

The invention provides a sensor for detecting particles in air and a manufacturing method of the sensor, as well as a detecting device comprising the sensor. The sensor is used for detecting particles in air, and comprises an upper part and a lower part which faces the inner side of the upper part and is fixed onto the upper part, wherein a particle screening device is arranged on the inner side of the upper part; a plurality of light source cavities and a plurality of detecting cavities are axially and symmetrically arranged on the upper part respectively; an air inlet and an air outlet which are penetrable and used for in-out of air to be tested are formed in the upper part; a circuit is formed on the inner side of the lower part; a plurality of light-emitting elements and a plurality of light-detecting elements are axially and symmetrically arranged on inner side of the lower part respectively in the range corresponding to the light source cavities and the detecting cavities; an axis is formed by the connecting line of the center of the air inlet and the center of the air outlet.

Description

technical field [0001] The invention relates to a sensor for detecting particulate matter in the air and a manufacturing method thereof, in particular to a sensor for detecting fine particulate matter in the air, such as PM2.5, and a manufacturing method thereof. Background technique [0002] With the advancement of science and technology and the improvement of living standards, people are paying more and more attention to health issues. Among them, people's awareness of pollution prevention is gradually strengthened, and people pay more and more attention to the pollution of the living environment. As a relatively serious pollution situation that cannot be ignored, air pollution has also received more and more attention. Correspondingly, sensors that can be used to detect the content of particulate matter in the air, especially fine particulate matter, such as PM2.5, are hot. [0003] At present, there are two main ways for people to obtain air quality data in the environ...

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Problems solved by technology

The second approach, that is, various commercial air inspection devices, has defects such as large volume and weight, inconvenient portability, and low detection accuracy.

[0006] The above-mentioned device solves the shortcomings of the air detection equipment in the traditional technology, such as large volume and inconvenient portability.

However, according to the structure of the above-mentioned device, it can be seen that its structure is relatively complicated, and the surfaces constituting the measurement chamber need to have a certain position and relative inclination relationship.

In addition, there are strict requirements for setting the position of the light-emitting element and photosensitive element in the measurement room, otherwise the accuracy of the measurement result will be affected

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