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Sensor and detection method for mass concentration of suspended particulate matters in air

A suspended particle, mass concentration technology, applied in the direction of suspension liquid and porous material analysis, measurement device, particle suspension analysis, etc., can solve the problems of poor accuracy, high cost, large volume, etc., to improve production efficiency and consistency , to ensure a consistent effect

Active Publication Date: 2015-11-04
南昌攀藤科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] However, the traditional sensors for detecting the mass concentration of suspended particles in the air are contradictory in terms of detection accuracy and cost. Among the traditional similar sensors for the concentration of suspended particles in the air, if a large sensor with high accuracy has high cost and large volume, And it is not conducive to large-scale automated production, and it is also not conducive to the application and popularization of particle concentration detection technology as an air quality indicator; if it is a low-cost small sensor, the accuracy is poor and the self-calibration compensation function is insufficient

Method used

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  • Sensor and detection method for mass concentration of suspended particulate matters in air
  • Sensor and detection method for mass concentration of suspended particulate matters in air
  • Sensor and detection method for mass concentration of suspended particulate matters in air

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Embodiment 1

[0049] refer to Figure 1-5 , this embodiment provides a sensor for detecting the mass concentration of suspended particulate matter in the air, including a laser generator 1, a convex lens 2, a laser seat 3, an aperture 4, a concave mirror 5, a photosensitive element 6 and an air circulation channel;

[0050] The laser generator 1 is fixed in the laser seat and emits a laser beam;

[0051] The convex lens 2 is arranged at the front end of the laser generator 1, that is, in the laser generator 1, so as to focus the laser beam emitted by the laser generator 1;

[0052] The aperture 4 is arranged on the laser seat 3;

[0053] The laser beam perpendicularly intersects the air circulation channel;

[0054] The concave mirror 5 and photosensitive element 6 are respectively arranged on both sides of the air circulation channel, and the connection line between the concave mirror 5 and the photosensitive element 6 is perpendicular to the air circulation channel and the laser beam re...

Embodiment 2

[0065] refer to Figure 6 , the present embodiment provides a method for detecting the mass concentration of suspended particulate matter in the air by using the sensor, comprising the following steps:

[0066] S10, energize the sensor; judge whether it is the first energization of the sensor; if yes, execute step S20, otherwise execute step S30; use step S10 to distinguish whether it is the first energization after the sensor assembly is completed, so as to determine The subsequent calibration process is still a daily work process. The calibration process is only performed when the sensor is powered on for the first time after the assembly is completed, and a calibration completion flag will be written in the power-down non-volatile memory inside the microprocessor after the completion of the calibration process. Every time the microprocessor finds that this flag is recorded in the memory when it is powered on, it proves that it is not the first time it is powered on;

[006...

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Abstract

The invention discloses a sensor and a detection method for mass concentration of suspended particulate matters in the air. The sensor comprises a laser generator, a convex lens, a laser device base, a lens screen, a concave lens, a photosensitive element and an air circulating passage, wherein a laser beam vertically intersects the air circulating passage; the concave lens and the photosensitive element are respectively arranged at two sides of the air circulating passage; a connection line of the concave lens and the photosensitive element respectively intersects the air circulating passage and the laser beam. According to the sensor disclosed by the invention, the consistency of optical paths is ensured through the convex lens and the laser device base which is used for limiting the installing position and the freedom degree of a laser device; meanwhile, the consistency of laser beams is increased by utilizing the lens screen, thus the accuracy of detecting the particle size of the suspended particulate matters in the air is increased, higher consistency between every two sensors can be ensured during large-scale automatic production, manual correction is not needed, and the production efficiency can be greatly increased.

Description

technical field [0001] The invention relates to a particle sensor and a method for detecting the mass concentration of suspended particulate matter in the air by using the particle sensor, in particular to a sensor and a detection method for detecting the mass concentration of suspended particulate matter in the air. Background technique [0002] At present, the sensors for detecting the mass concentration of suspended particulate matter in the air mainly use Mie [0003] (Mie) theory and its approximate conclusions. According to the approximate conclusion of the Mie theory, the incident light is irradiated on the isotropic spherical particles of the surrounding uniform medium, and the distribution of scattered light intensity at each angle is related to the intensity of the incident light, the wavelength of the incident light, the scattering angle, and the diameter of the spherical particles. A stricter correlation. [0004] The light scattering method based on this theor...

Claims

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Application Information

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IPC IPC(8): G01N15/06
Inventor 周志斌
Owner 南昌攀藤科技有限公司
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