Laser speckle test system

A technology of laser speckle and testing system, which is applied in the testing of machine/structural components, measuring device, fluid velocity measurement, etc., can solve the problem of inappropriate nanoparticle motion measurement, etc., and achieve the effect of simple system structure

Inactive Publication Date: 2009-04-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

One of the characteristics of Rayleigh scattering is that the scattered light is very weak. A single nanoparticle cannot form a particle image. It must illuminate a large number of particles, and then the scattered light of a large number of particles can be interfered and superimposed to form a clearly visible speckle image. Theref

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  • Laser speckle test system

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Embodiment Construction

[0010] Below in conjunction with the accompanying drawings, Fe 3 o 4 - Taking water nanofluid as an example, the present invention will be further described in detail.

[0011] Referring to the accompanying drawings, the laser speckle test system for testing the speed of movement of nanoparticles in nanofluids made according to the present invention mainly consists of a high-power laser light source 1, a lens 2 and a lens 3 to form a beam expander lens group, and the nanofluid is transparent. Pipeline 4 and recording device 6 are composed. In the entire visible light band, blue-green light has the least attenuation in water, so this band is often called "underwater window". Therefore, for nanofluids with water as the base fluid, green light with a wavelength of 532nm is usually used as the irradiation light source. This paper The high-power laser source 1 in the example is an LD green semiconductor laser with a wavelength of 532nm, and the power is adjustable; the focal leng...

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Abstract

The invention discloses a laser speckle testing system used for measuring the movement velocity of nano-particles in nano-fluid. The system is characterized in that the irradiation mode of a light source and the receiving mode of a recording device are improved according to the optical character of the nano-particles. An extender lens system is used for two-dimensional expansion of laser beam to form the flowing nano-particles that are irradiated by a surface light source; the recording device is arranged on the light path which positively faces to the incident light direction at the other side of a transparent pipe of the tested nano-fluid according to the rayleigh scattering characteristic, so that the speckle image of the nano-particles is recorded clearly; the laser speckle testing system of the invention is not only used for measuring the movement of the nano-particles in the nano-fluid, but also applicable to the movement measurement of micron particles; the system has simple structure and wide range of usage, and can be widely applicable to speckle measurement of the movement velocity of fluid.

Description

a technical field [0001] The invention relates to a laser test system, in particular to a laser speckle test system for testing the moving speed of nanoparticles in nanofluid. Two background technology [0002] As early as 1977, speckle measurement technology was introduced into the field of fluid mechanics to measure the velocity of flow field, which is called laser speckle velocimetry, and gradually developed into particle image velocimetry. The application is particularly extensive. The testing principles of the laser speckle testing system and the particle image testing system are similar. They both indirectly measure the transient velocity distribution in the flow field by measuring the displacement of the tracer particles within a known short time interval. The difference is the magnitude of the tracer particle concentration. When the concentration of scattering particles is small, the distance between the particles is far away, and there will be no interference betw...

Claims

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Application Information

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IPC IPC(8): G01P5/20G01M10/00
Inventor 钱明倪晓武严琴陆建沈中华骆晓森
Owner NANJING UNIV OF SCI & TECH
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