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PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof

A sensor, calibration gas technology, applied in scientific instruments, measuring devices, suspension and porous material analysis, etc., can solve the problems of scattered light signal acquisition errors, inaccurate sensor measurement results, etc., to achieve simple application, simple structure, design reasonable effect

Inactive Publication Date: 2016-10-26
SAIC VOLKSWAGEN AUTOMOTIVE CO LTD
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Problems solved by technology

However, after long-term use, particles will accumulate inside the sensor, and even adhere to the light source, optical path and photodetector, causing errors in the collection of scattered light signals, resulting in inaccurate measurement results of the sensor

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  • PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof
  • PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof
  • PM 2.5 (particulate matter 2.5) sensor and automatic calibration method thereof

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Embodiment Construction

[0031] The above-mentioned features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

[0032] See figure 1 , figure 1 The structure of a preferred embodiment of the PM2.5 sensor of the present invention is shown. The PM2.5 sensor includes a detection gas channel 4, a calibration gas channel 5, a detection light source unit 7, a light receiving unit 9, a signal processing unit, a solenoid valve 3, an electronic valve control unit, and a detection chamber 8. The solenoid valve control unit controls the solenoid valve 3 to switch between the detection gas channel 4 and the calibration gas channel 5 . The calibration gas channel 5 filters the air to generate cl...

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Abstract

The invention discloses a PM 2.5 (particulate matter 2.5) sensor and an automatic calibration method thereof. By automatically calibrating detection results of a sensor through clean air, the error due to particulate matter accumulation is overcome and it is ensured that detection results of the sensor are highly accurate within a service cycle. A technical scheme of the invention refers to the PM 2.5 sensor, comprising a detection gas passage, a calibrating gas passage, a detection light source unit, a light receiving unit, a signal processing unit, an electromagnetic value, an electromagnetic valve unit and a detection chamber; by dividing a detection chamber intake passage into the detection gas passage and the calibrating gas passage and using outside air and filtered clean air respectively, PM 2.5 detection concentration and background concentration are obtained, thus enabling the detection centration to be calibrated with the background concentration.

Description

technical field [0001] The invention relates to the field of PM2.5 particle concentration detection in the air, in particular to a sensor for PM2.5 detection based on a light scattering method and an automatic calibration method for PM2.5 concentration using the sensor. Background technique [0002] PM2.5 refers to particulate matter with an aerodynamic equivalent diameter less than or equal to 2.5 microns in the ambient air. It has a small particle size, a large area, and strong activity. It is easy to attach toxic and harmful substances (such as heavy metals, microorganisms, etc.), and stay in the atmosphere. The time is long and the transportation distance is long, so it has a great impact on human health and the quality of the atmospheric environment. In February 2012, the Ministry of Environmental Protection of China issued the "Ambient Air Quality Standard" (GB3095-2012), which added the concentration limit of PM2.5. Therefore, it is of great significance to accuratel...

Claims

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Application Information

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IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/075
Inventor 丁雪临余召锋
Owner SAIC VOLKSWAGEN AUTOMOTIVE CO LTD
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