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Small compressed-air-based PM2.5-concentration detection device

A concentration detection and compressed air technology, applied in measurement devices, suspension and porous material analysis, particle suspension analysis, etc. The effect of cost, good real-time performance and low equipment cost

Inactive Publication Date: 2015-02-04
哈尔滨幻石科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] First, due to the use of no reference image, the measurement results rely on statistical results, and the accuracy is low;
[0007] Second, the device requires multiple targets and a laser range finder, which not only has high equipment costs, but also has cumbersome detection steps, a large amount of calculation, and unsatisfactory real-time performance;
[0008] Third, the device is not conducive to miniaturization design

Method used

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  • Small compressed-air-based PM2.5-concentration detection device

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0023] The small PM2.5 concentration detection device based on compressed air in this embodiment includes a compression chamber, a laser 1 disposed inside the compression chamber, a pinhole 2, a collimating objective lens 3, a rectangular grating 4, an imaging objective lens 5 and an image sensor 6; The laser beam emitted by the laser 1 passes through the pinhole 2 to form a point light source, and then collimated by the collimating objective lens 3 to form parallel light, which is irradiated on the rectangular grating 4, and the illuminated rectangular grating 4 is imaged to the image sensor by the imaging objective lens 5 6 surface, light path diagram as figure 1 Shown; said compression chamber is provided with an air compressor and an air extractor for adjusting the air pressure in the compression chamber.

specific Embodiment 2

[0024] The small-scale PM2.5 concentration detection device based on compressed air in this embodiment, on the basis of the specific embodiment 1, further defines that an air pump is arranged in the compression chamber. The air pump can make the gas in the compression chamber flow, which not only effectively prevents the solid particles in the compressed air from adhering to the optical elements, which will cause the visibility to decrease and affect the detection accuracy, but also can make the solid particles in the compressed air more uniform, which plays a single-shot Measures the effect of averaging multiple measurements equivalently.

specific Embodiment 3

[0025] The small-scale PM2.5 concentration detection device based on compressed air in this embodiment, on the basis of the second embodiment, further limits the number of air pumps to multiple. This design can make the flow direction of compressed air more random, and avoid the principle error caused by the one-way flow of compressed air to the measurement results.

[0026] The small-scale PM2.5 concentration detection method based on compressed air realized on the small-scale PM2.5 concentration detection device based on compressed air described in the above embodiments comprises the following steps:

[0027] Step a, use an air pump to evacuate the compression cavity, and the image sensor 6 images the rectangular grating 4 to obtain the first contrast of the rectangular grating 4;

[0028] Step b, using an air compressor to press the air to be measured into the compression cavity, and compress the air in the compression cavity to 500 standard atmospheric pressure;

[0029] ...

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Abstract

The invention discloses a small compressed-air-based PM2.5-concentration detection device belonging to the field of automatic environment monitoring, and particularly relates to a PM2.5-concentration detection device. The PM2.5-concentration detection device comprises a compression cavity, and a laser, a pinhole, a collimator objective, a rectangular optical grating, an imaging objective and an image sensor which are arranged inside the compression cavity; a laser beam emitted from the laser forms a point light source after passing through the pinhole, and the point light source forms parallel light after being collimated by the collimator objective, the parallel light irradiates the rectangular optical grating, the illuminated rectangular grating is imaged on the surface of the image sensor by means of the imaging objective; an air compressor and an air exhauster used for regulating pressure in the compression cavity are arranged outside the compression cavity. The small compressed-air-based PM2.5-concentration detection device provided by the invention is capable of realizing relatively high detection precision, low in equipment cost, simple in detection steps, small in calculated amount, good in instantaneity, and simultaneously capable of realizing compact design.

Description

technical field [0001] A small PM2.5 concentration detection device based on compressed air belongs to the field of environmental automatic monitoring, and in particular relates to a PM2.5 concentration detection device. Background technique [0002] Haze is directly related to PM2.5 particulate matter. By detecting the concentration of PM2.5, the haze weather can be quantitatively evaluated. [0003] The traditional PM2.5 detection method is to distribute smog monitors in different locations. This method has higher accuracy, but due to the complexity of the smog monitor equipment and high technical content, the detection cost also increases accordingly. [0004] Studies have shown that the concentration of PM2.5 has a linear relationship with the air visibility, so the concentration of PM2.5 can be obtained through the air visibility evaluation function. The invention patent with the application number 201410200873 "PM2.5 Concentration Detector Based on No Reference Image ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
Inventor 宁凯
Owner 哈尔滨幻石科技发展有限公司