Air purifier, laser dust concentration sensor and detection method thereof

Abstract

The invention belongs to the field of air quality detection, and particularly relates to an air purifier, a laser dust concentration sensor and a detection method thereof. According to the laser dust concentration sensor, a correcting photosensitive part used for correction is additionally arranged at a specific position in a light trap, after incoming laser is absorbed and reflected by the interior of the light trap, intensity of light irradiated on the correcting photosensitive part is substantially weakened, and voltage output converted from output current of the correcting photosensitive part through a special pulse voltage output circuit is read as a correcting voltage. The sensor corrects a real-time pulse voltage output from a detection photosensitive part according to the correcting voltage, and dust concentration is determined with the corrected pulse voltage as a basis. The laser dust sensor has high accuracy under different temperatures through low cost and a simple technology. In the same way, the air purifier internally provided with the laser dust concentration sensor can achieve the air purification purpose better, and user experience is improved.

Description

technical field [0001] The invention belongs to the field of air quality detection, and in particular relates to an air purifier, a laser dust concentration sensor and a detection method thereof. Background technique [0002] The laser dust concentration sensor is a device that uses the MIE scattering theory to count or measure the mass concentration of suspended particles in the air. Such as figure 1 As shown, the usual way is to use an independent air duct to introduce the sampled air into the sensor, the sampled air flows directly above the detection photosensitive element 1, and then uses a monochromatic laser (executed by the laser emitting tube 2) to irradiate the sampled air, And the incident light is parallel to the detection photosensitive sensor; the laser light is converged into a small enough spot directly above the detection photosensitive sensor 1 through the lens 3, and the laser light is absorbed by an optical trap joint 4 to reduce the optical noise generat...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is at first to provide a laser dust concentration sensor, to solve the problem of inconsistent output accuracy of the existing laser dust concentration sensor under different temperature conditions, so that it can have higher accuracy

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