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Aerosol particle optical detection device

A technology of particle optics and detection devices, which is applied in the direction of measuring devices, scientific instruments, individual particle analysis, etc., can solve problems such as inability to guarantee one-to-one correspondence, monotony, and inaccurate particle size detection

Pending Publication Date: 2021-05-28
BEIJING HTNOVA DETECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The laser dust particle counter based on forward scattered light particle counting and detection can only detect and count one aerosol particle at a time. It is necessary to focus the laser to a smaller size to reduce the probability of overlapping particles and increase the upper limit of the detection concentration. After converging and focusing, single-point detection is used to detect the scattered light intensity, and the particle size is determined by the mapping curve (F-D curve) between the scattered light intensity and particle size, but the F-D curve cannot be strictly monotonous. There is no strict one-to-one correspondence between the diameters D, and there is a Mie resonance zone in the F-D curve, and the particle size detection in the resonance zone is inaccurate

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  • Aerosol particle optical detection device
  • Aerosol particle optical detection device
  • Aerosol particle optical detection device

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 1 with figure 2 As shown, an optical detection device for aerosol particles in this embodiment includes:

[0042] The light source 1 is used to emit light beams to irradiate the aerosol particles entering the detection area 13; the light source 1 can be a monochromatic semiconductor laser, LED or a broadband xenon lamp light source, etc.;

[0043] Aerosol circulation channel for scattered light detection of aerosol particles;

[0044] Digital micromirror array components for deflection modulation and convergence of light scattered by different annular apertures;

[0045] The distributed single-point detector 10 is used to receive the scattered light of the converging annular aperture and convert the light signal into an electrical signal.

[0046] Distributed single-point detectors 10 are arranged in corresponding positions according to the positions of the convergence points, and the number of detection points used is determined by the particle size ...

Embodiment 2

[0049] Such as figure 1 As shown, an optical detection device for aerosol particles in this embodiment includes:

[0050] The light source 1 is used to emit light beams to irradiate the aerosol particles entering the detection area 13; the light source 1 can be a monochromatic semiconductor laser, LED or a broadband xenon lamp light source, etc.;

[0051] Aerosol circulation channel for scattered light detection of aerosol particles;

[0052] Digital micromirror array components for deflection modulation and convergence of light scattered by different annular apertures;

[0053] The distributed single-point detector 10 is used to receive the scattered light of the converging annular aperture and convert the light signal into an electrical signal.

[0054] Distributed single-point detectors 10 are arranged in corresponding positions according to the positions of the convergence points, and the number of detection points used is determined by the particle size channels disting...

Embodiment 3

[0069] Such as figure 2 As shown, an optical detection device for aerosol particles in this embodiment includes:

[0070] The light source 1 is used to emit light beams to irradiate the aerosol particles entering the detection area 13; the light source 1 can be a monochromatic semiconductor laser, LED or a broadband xenon lamp light source, etc.;

[0071] Aerosol circulation channel for scattered light detection of aerosol particles;

[0072]Digital micromirror array components for deflection modulation and convergence of light scattered by different annular apertures;

[0073] The distributed single-point detector 10 is used to receive the scattered light of the converging annular aperture and convert the light signal into an electrical signal.

[0074] The distributed single-point detector 10 is arranged in a corresponding position according to the position of the converging point, and the number of detection points used is determined by the particle size channels disting...

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Abstract

The invention relates to an aerosol particle optical detection device. The device comprises a light source for emitting a light beam to irradiate aerosol particles entering a detection area, an aerosol circulation channel used for detecting scattered light of the aerosol particles, a digital micromirror array assembly used for deflection modulation and convergence of scattered light with different annular apertures, and a distributed single-point detector used for receiving the converged annular aperture scattered light and converting an optical signal into an electric signal. According to the device for carrying out aerosol particle light scattering counting detection through the digital micro-mirror array and the distributed single-point detectors, scattered light of particles with different particle sizes is converged into the plurality of single-point detectors through angle selection of each micro-mirror in the digital micro-mirror array; and a multi-element photoelectric detector with a large area array can be avoided, meanwhile, the collection efficiency of forward scattering light energy is improved, and an F-D curve does not need to be calibrated so that the problem of inaccurate particle size detection caused by a Mie resonance region does not exist.

Description

technical field [0001] The invention relates to the related technical field of aerosol detection, in particular to an optical detection device for aerosol particles. Background technique [0002] When light passes through an inhomogeneous medium, the scattering phenomenon that deviates from its straight-line propagation direction will occur, which is caused by the joint action of absorption, reflection, refraction, transmission and diffraction. The form of scattered light contains information such as the size, shape, structure, and composition, composition, and concentration of the scatterer. Therefore, the concentration distribution and refractive index of the particle group can be measured by using the light scattering technique, and the size distribution of the particle group can also be measured. [0003] The existing measuring devices are as follows: (1) Forward scattering laser particle size analyzer, particle size spectrometer: Laser particle size analyzer is a preci...

Claims

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Application Information

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IPC IPC(8): G01N15/10
CPCG01N15/10
Inventor 汪强钟卉袁丁吴红彦夏征
Owner BEIJING HTNOVA DETECTION TECH CO LTD