Measuring device and method of light scattering particles

A measuring device, a technology of light scattering, applied in the direction of measuring device, particle and sedimentation analysis, particle size analysis, etc., can solve problems such as multiple reflection interference

Inactive Publication Date: 2012-02-15
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the interference problem caused by multiple reflections of scattered light between the measurement area and the detector surface in the inverse Fourier transform system, and realize the simultaneous measurement of the particle size distribution and concentration of small particle size particles

Method used

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  • Measuring device and method of light scattering particles
  • Measuring device and method of light scattering particles
  • Measuring device and method of light scattering particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] like Figure 4 As shown, the divergent beam module 10 includes a laser 1, a first lens 2, a pinhole stop 3 and a second lens 4, and the laser beam output by the laser 1 passes through the first lens 2, the pinhole stop 3 and the second lens in sequence The second lens 4 expands the beam to form a convergent Gaussian beam, and the convergent Gaussian beam passes through the beam waist, that is, the center A of the beam, and becomes divergent light.

[0052] Selecting the focal lengths of the first lens 2 and the second lens 4 and adjusting their positions can form divergent light beams with different opening angles, and the pinhole diaphragm 3 acts as a spatial filter to remove stray light.

Embodiment 2

[0054] like Figure 5 As shown, the divergent beam module 10 includes a monochromatic point light source 11, a reflective paraboloid 12 and a beam limiting diaphragm 13 and a small aperture filter diaphragm 14 arranged in sequence behind the monochromatic point light source. The monochromatic light source 11 is located on the reflective paraboloid 12 At one focus of the monochromatic point light source 11, the light emitted by the monochromatic point light source 11 is reflected by the reflective parabola 12 and then converges on the other focus of the parabola to form a divergent beam. This focus is the beam center A of the divergent beam. The small hole filter diaphragm 14 is set On the beam center of the diverging beam, the beam limiting diaphragm 13 determines the opening angle of the diverging beam, and the pinhole filtering diaphragm 14 filters out stray light.

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PUM

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Abstract

The invention discloses a measuring device and a measuring method of light scattering particles. The measuring device successively comprises a divergent beam module, a measurement zone, a receiving lens, a multielement photodetector, a transmission light detector, a signal processing circuit, and an analog-to-digital converter. The method comprises the following steps that: particles in the measurement zone are illuminated by the divergent beam, the scattered light and transmission light are collected by the receiving lens simultaneously, the scattered light is projected on each detection unit of the multielement photodetector to obtain a scattered light distribution signal, the un-scattered part of the incident light is received by the transmission light detector to obtain a transmissionlight signal, the scattered light distribution signal and transmission light signal are amplified, collected and converted by the signal processing circuit and the analog-to-digital converter, and particle size distribution and concentration information are calculated according to the scattered light distribution signal and transmission light signal. According to the invention, the problem of signal interference caused by close distance between the measurement zone and the detector is solved, the lower limit of the particle measurement is lowered, and the invention can be applied in a plurality of areas of particle measurement.

Description

technical field [0001] The invention relates to a particle measuring method and device, in particular to a light scattering particle measuring device and method. It can be used in many fields involving particle measurement, such as scientific research, biomedicine, chemical energy, environmental protection, etc. Background technique [0002] In light scattering particle measurement technology, forward scattering particle measurement technology is the earliest and most mature measurement technology, based on diffraction theory or classical Mie scattering theory. The measurement device generally includes a laser (or other monochromatic light source) 1, a collimator composed of a first lens 2, a small aperture stop 3 and a second lens 4, a measurement area 5, a receiving lens 6, and a multi-element photodetector. 7. Transmitted light detector 8, signal processing circuit and analog-to-digital converter 9, such as figure 1 shown. Each detection unit of the multi-element photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N15/00
Inventor 沈建琪王华睿
Owner UNIV OF SHANGHAI FOR SCI & TECH
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