Double-laser head dust detection method and sensor

Abstract

The invention discloses a double-laser head dust detection method. Two laser heads are employed alternately to emit laser to one detection area, the laser scattered after being emitted to dust is captured through a photoelectric receiver, and the laser passing through the detection area is reflected to other directions except for the detection area through reflecting surfaces. The invention also discloses a double-laser head dust detection sensor, the sensor includes a box internally equipped with the corresponding laser heads and the photoelectric receiver, the number of the laser heads is two, and the number of the photoelectric receiver is one, the box is internally provided with a detection area, and the photoelectric receiver is located on one side of the detection area. The box is internally provided with a circuit board connected to the laser heads and the photoelectric receiver, and is also equipped with the reflecting surfaces. According to the double-laser head dust detection method and sensor provided by the invention, the two laser heads are used alternately, the service life of the laser head combination can reach 30 thousand to 40 thousand hours, and the lifetime is greatly improved.

Description

technical field [0001] The invention relates to the field of dust concentration detection equipment, in particular to a double laser head dust detection method and a sensor. Background technique [0002] At present, the detection of dust concentration (such as PM2.5) in the air is realized by a dust detector, and the dust detection sensor is the main component of the dust detector. The dust detection sensor is equipped with a one-to-one corresponding laser head and photoelectric receiver. The laser emitting end of the laser head faces the photoelectric receiver, and uses the light scattering method to detect the dust mass concentration in the air. However, the laser head is limited by its own structure and function, and needs to output a large amount of energy, especially under the condition of continuous work, resulting in a short service life of the laser head, which is generally between 5,000 and 10,000 hours. After damage A new laser head needs to be replaced, and the u...

AI Technical Summary

Problems solved by technology

However, the laser head is limited by its own structure and function, and needs to output a large amount of energy, especially under the condition of continuous work, resulting in a short service life of the laser head, which is generally between 5,000 and 10,000 hours. After damage A new laser head needs to be replaced, and the cost of use is relatively high

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