Optical vortices-based dynamic speckle test method

An optical vortex and test method technology, applied in the measurement of phase influence characteristics, etc., can solve the problems of limited amount of information, large amount of data processing, single characteristic factor of quantitative analysis, etc.

Inactive Publication Date: 2013-11-06
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0006] From the above analysis, we can see that in the existing dynamic speckle test methods, a dynamic process often needs to process hundreds of speckle images, and the amount of data processing is very large. The characte

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  • Optical vortices-based dynamic speckle test method
  • Optical vortices-based dynamic speckle test method
  • Optical vortices-based dynamic speckle test method

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[0051] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052] according to figure 1 The optical path diagram of the structural layout measurement; the selected continuous wave laser 1 is a He-Ne laser with a laser wavelength of 632.8 nm and a power of 10 mW. The laser beam emitted by the continuous wave laser 1 becomes parallel light after being collimated by the beam expander 2, and irradiates on the sample 4 to be tested, and the sample 4 to be tested is placed on the stage 3; the laser beam is scattered by the sample 4 to be tested , forming a speckle light field in the reflection area; after passing through the converging lens 5, it enters the CCD camera 6 for imaging, and then stores it in the computer 7 for processing; wherein, the sample 4 to be tested is white water-soluble paint, and the dynamic process of its natural drying is studied ; During the experiment...

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Abstract

The invention discloses an optical vortices-based dynamic speckle test method. The optical vortices-based dynamic speckle test method comprises following steps: firstly, dynamic speckle sequential images of a dynamic changing process of an object is obtained; then the dynamic speckle sequential images are converted by a Laguerre-Gauss complex filter so as to obtain an optical vortices core structure parameter distribution matrix; and at last, quantitative analysis and measurement of the dynamic changing process are realized by using two novel characteristic factors, wherein the two novel characteristic factors are dynamic vortex survival rate and in-plane average speed of survival vortex. The optical vortices-based dynamic speckle test method is capable of realizing monitoring on dynamic random processes effectively, and is suitable for rapid changing and gradual changing processes, and quasi-static processes.

Description

technical field [0001] The invention relates to a speckle test method for measuring the dynamic change process of an object. Specifically, it relates to a dynamic speckle test method that utilizes an optical vortex to realize a quantitative test on a dynamic change process of an object. Background technique [0002] When coherent light is irradiated on the surface of a rough object, the scattered light interferes with each other in the imaging space to form bright and dark spots, which are called speckle; when the tested sample changes dynamically over time, the speckle pattern also changes with time, called dynamic Speckle. The dynamic speckle test method has been widely used in the fields of medicine, biology and agricultural science, and is a research hotspot in the field of optical testing. [0003] Among the dynamic speckle testing methods, one is based on the first-order statistical properties of the speckle field. This type of method uses speckle pattern contrast a...

Claims

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Application Information

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IPC IPC(8): G01N21/45
Inventor 李新忠台玉萍杜凯王晓飞张利平李立本
Owner HENAN UNIV OF SCI & TECH
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