Particle field total-field measurement process and apparatus based on laser sheet optical image-forming

A technology of laser sheet light and measuring devices, which is applied in the direction of measuring devices, particle size analysis, particle and sedimentation analysis, etc., to achieve the effect of avoiding the analysis and requirements of follow-up and light scattering, avoiding interference problems, and avoiding technical and financial problems
CN1252451CInactive Publication Date: 2006-04-19UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF SCI & TECH OF CHINA
Publication Date
2006-04-19
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The present invention is whole particle field measuring method and equipment based on laminar laser imaging and features that particles in test flow field are illuminated with orthogonal laminar laser beams and two CCD cameras are used to take the particle motion locus images both in the direction perpendicular to the flow field and in the direction parallel to the flow field separately. The equivalent diameters of particles are determined via particle image distinction and statistical analysis of covered pixels, and the particle motion speeds, including magnitudes and directions, are determined via the distinction and analysis of particle motion locus image, so as to obtain the size spectrum and speed field distribution of particles in the imaging plane. The present invention needs no addition of tracing particle, and may be used widely in the two-phase and multi-phase flow field measurement in various fields.
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Description

Technical field:

[0001] The invention relates to a method and device for measuring particle size and velocity in two-phase or multiphase flow. Background technique:

[0002] Proceedings of the 15th International Conference on Fire Safety Research (15th meeting of the UJNR panel on fire research and safety, March 1-7, 2000, pp.471-481.) and Proceedings of the 8th International Conference on Liquid and Spray Systems (8thInternational Conference on Liquid and Spray Systems, Pasadena, USA, 2000, 886-892.) pointed out that although the Digital Particle Image Velocimetry (DPIV) method developed in recent years can do dynamic full-field measurement of the flow field , but because it uses the particle image cross-correlation technique to reconstruct the velocity of the flow field, it is required that the laser sheet light must be parallel to the direction of the flow field, and it is required to apply tracer particles with good followability and light scattering characteristics to t...

Claims

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