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High-precision photoelectric dust particle detection device and detection method

A particle detection and detection method technology, which is applied in measurement devices, individual particle analysis, particle and sedimentation analysis, etc., can solve problems such as unclear judgment of pulse signals, and achieve the effect of facilitating measurement and identification, eliminating errors, and eliminating boundary effects.

Active Publication Date: 2018-06-26
NINGBO ZHONGWU DONGFANG OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

However, the light-scattering photoelectric dust particle detection devices on the market today generally have the following problems: a. When the dust edge passes through the light-sensitive area, it will be judged as dust smaller than the real thing
b. The judgment of the pulse signal is not clear

Method used

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  • High-precision photoelectric dust particle detection device and detection method
  • High-precision photoelectric dust particle detection device and detection method
  • High-precision photoelectric dust particle detection device and detection method

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Embodiment Construction

[0018] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] Such as figure 1 , 2 As shown, a high-precision photoelectric dust particle detection device includes an illumination optical path, a measuring cavity 4, an air path system arranged perpendicular to the central axis of the illumination optical path, a mirror 5 for reflecting scattered light, and a scattered light collection system and a processor, the illumination light path includes a light source 1, a first mask 2 and a first lens 3 for focusing, and the scattered light collection system includes a second lens 6, a second mask 7 and a lens for generating The photosensitive element 8 of the electric pulse, the first mask 2 and the second mask 7 are provided with a light-transmitting channel arranged in the shape of "Lv"; The photosensitive area 4.1 and the second photosensitive area 4.2, the side length of the first photosensitive area 4.1 is s...

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Abstract

The invention discloses a high-precision light-electric dust particle detection device and detection method. A lighting light path comprises a light source, a first mask film and a first lens, an emitted light collection system comprises a second lens, a second mask film and a light sensitive element, and the first mask film and the second mask film are each provided with a light-transmitting channel which is shaped like a Chinese character 'lv'; a measuring cavity comprises a first light sensitive area and a second light sensitive area which are arranged in an up and down symmetrically overlapped mode, the side length of the first light sensitive area is smaller than that of the second light sensitive area, the thickness of the first light sensitive area and the thickness of the second light sensitive area are both larger than the largest measurable particle size, and a gap d is formed between the first light sensitive area and the second light sensitive area. By means of the high-precision light-electric dust particle detection device and detection method, errors caused by the boundary effect can be effectively eliminated, higher measurement precision can be achieved through a more simple and reliable system, the cost is low, and atmosphere particles with small sizes can be detected precisely.

Description

technical field [0001] The invention relates to the technical field of dust particle detection, in particular to a high-precision photoelectric dust particle detection device and a detection method. Background technique [0002] The basic principle of photoelectric dust particle detection is that the detection photoelectricity of the optical sensor is received by the photosensitive element after being scattered by dust particles and generates a pulse signal. The pulse signal is output and amplified, and then digital signal processing is performed. By comparing with the standard particle signal, the The results are expressed with different parameters. Particles in the air scatter light when illuminated by light. Light scattering is related to factors such as particle size, light wavelength, particle refractive index, and particle absorption characteristics of light. However, in terms of scattered light intensity and particle size, the intensity of light scattered by a parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/14
Inventor 曲敬镭朱春灵张建式
Owner NINGBO ZHONGWU DONGFANG OPTOELECTRONICS TECH CO LTD
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