Three-dimensional illumination method for tomographic particle image velocimetry

A particle image velocimetry, three-dimensional technology, applied in the direction of measuring device, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problem that particle image flow field measurement cannot be carried out, and achieve the elimination of central hot spot and faded edge distribution, Good stability and uniform optical density

Inactive Publication Date: 2018-07-31
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

Flow field measurement by particle image velocimetry is impossible without clear and reliable images

Method used

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  • Three-dimensional illumination method for tomographic particle image velocimetry
  • Three-dimensional illumination method for tomographic particle image velocimetry
  • Three-dimensional illumination method for tomographic particle image velocimetry

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Embodiment 1

[0051] 1), the laser used in this invention is a solid-state laser with a wavelength of 532nm. The point light source emitted by the laser is passed through a Powell prism, and the one-dimensional beam expansion becomes a sheet light source with a divergence angle of 30 degrees;

[0052] 2) Using a plano-convex cylindrical mirror with a focal length of 50mm and a diameter of 25.4mm, the divergent sheet light source is collimated into a parallel sheet light source with a length of 25mm;

[0053]3), the used prism of the present invention is that two right-angled sides are respectively 50mm, 75.8mm, and apex angle is the K9 right-angled prism of 33.4 degree, with 56.59 ° incident to the inclined-plane of prism, vertically emerge from the right-angled surface. Through the beam expander system combined with 6 prisms, the beam expands into a three-dimensional light source with a rectangular cross section and a size of 25mm*12mm.

[0054] The three-dimensional lighting method of the...

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Abstract

The invention discloses a three-dimensional lighting method for tomographic particle image velocimetry, comprising the following steps: (1) carrying out one-dimensional beam expanding of a point light source using a Powell prism to get divergent sheet light sources; (2) collimating the sheet light sources obtained in step (1) into parallel sheet light sources using a cylindrical lens; and (3) beam-expanding the parallel sheet light sources obtained in step (2) using N prisms, and calculating out the incident angle Theta<opt> of the ith prism. According to the three-dimensional lighting method for tomographic particle image velocimetry of the invention, the energy loss is small, the efficiency is high, the marking mode of the adopted Powell prism is superior to that of the cylindrical lens, center hotspot and faded marginal distribution of Gaussian beams can be eliminated, the optical density is uniform, and the stability is good.

Description

technical field [0001] The invention relates to a three-dimensional lighting method for tomographic particle image velocity measurement. Background technique [0002] Tomographic Particle Image Velocimetry (Tomographic Particle Image Velocimetry) is an advanced optical measurement technology that can quantitatively obtain the three-dimensional flow field structure, and can be used as an effective measurement method for three-dimensional complex flow fields such as turbulent flow and multi-vortex interference. Since the emergence of tomographic particle image velocimetry technology, it has received extensive attention from relevant industries in the world. Tomographic particle image velocimetry uses a three-dimensional laser beam to illuminate the tracer particles in the whole field, uses multiple cameras to record the flow field from different angles at the same time, and reconstructs the three-dimensional space particle field of the flow field by tomography . Therefore, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09G01P1/00G01P5/00
CPCG01P1/00G01P5/00G02B27/0927G02B27/0938
Inventor 宋旸张芬渠向举纪运景李振华
Owner NANJING UNIV OF SCI & TECH
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