Dynamic speckle measurement method for particle size and concentration change of turbid medium

Abstract

The invention discloses a dynamic speckle measurement method for the particle size and concentration change of turbid medium. The invention adopts the principle that when laser irradiates on turbid medium solution with dynamic change, dynamic speckles are formed in a forward scattering field and a backward scattering field, and the speckle size and contrast value of a dynamic speckle picture is in direct proportion with the particle size in the turbid media and in inverse proportion with concentration. Therefore, the particle size and concentration change in the turbid medium can be dynamically monitored in a real time mode by calculating the change of speckle size and contrast value of a dynamic speckle picture sequence. The method is a non-invasive type detection method, has the characteristics of simple operation and wide application range, and can be widely applied in the fields of medical biology, atmospheric environmental monitoring, underwater exploration, and the like.

Description

Technical field [0001] The invention relates to a method for measuring particle size and concentration changes in turbid media by using dynamic speckle. Specifically, it involves the use of dynamic speckle to measure changes in particle size and concentration when the solution changes; this method is easy to operate and popularize, and is of great significance to medical biology, air pollution detection, and seabed detection. Background technique [0002] Turbid media refers to media with non-uniform refractive index that can cause light scattering. Biological tissues, atmosphere, and seawater contain a large number of particles, which are typical turbid media; when light is transmitted in these media, scattering and absorption will occur. Studying the optical properties of turbid media has important academic value and practical significance in the fields of medical biology, air pollution and underwater target detection, and is a research hotspot in the field of optical detection...

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Problems solved by technology

Through literature search, (authorized announcement number is CN 1234000C, and authorized announcement date is 2005.12.28) patent "measurement method of nanoparticle content in solution", provides a kind of determination method of nanoparticle content in solution, this method is suitable for Determination of the content of nanoparticles in ordinary nano-slurries, plating solutions containing nanoparticles, nano-composite coatings and other solutions, the disadvantage is that it is necessary to prepare standard solutions and make working curves, and the preparation of solutions and measurement processes are cumbersome; the patent "a flow solution concentration "real-time measuring device" (authorized announcement number is CN 1130560C, announcement date is 2003.12.10), which can measure the concentration of the flowing solution in real time, but it is necessary to intrude the optical prism below the liquid surface. This is an intrusive measurement that destroys the Measure the sample environment and limit its scope of application; patent, "a device and method for non-contact measurement of solution concentration" (publication number is CN101430275A, publication date is 2009.05.13), its applicable object is non-scattering eye aqueous humor, The scope of application is very narrow and not universal

[0003] The analysis shows that in the detection technology of particle size and concentration changes in turbid media, the main problems are: the particle size and concentration changes in turbid media solutions cannot be measured at the same time, the measuring device is complicated, and non-contact real-time measurement cannot be realized , the scope of application is too narrow, and the method is not universal

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