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Flow field velocity measurement method and device based on fusion light intensity and polarization information

A technology of velocity measurement and polarization information, which is applied in the direction of fluid velocity measurement, measuring device, velocity/acceleration/shock measurement, etc., which can solve the problems of deviation of measurement results and achieve the effect of improving accuracy

Pending Publication Date: 2022-02-08
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned cross-correlation calculation using light intensity information is affected by the light intensity information, and some measurement results have large deviations

Method used

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  • Flow field velocity measurement method and device based on fusion light intensity and polarization information
  • Flow field velocity measurement method and device based on fusion light intensity and polarization information
  • Flow field velocity measurement method and device based on fusion light intensity and polarization information

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Embodiment 1

[0038] An embodiment of the present invention provides a flow field velocity measurement method based on fusion of light intensity and polarization information. The flow field is a supersonic or hypersonic flow field. This method is applied to a flow field velocity measurement system. See figure 1 A flowchart of a flow field velocity measurement method based on fusion of light intensity and polarization information is shown, the flow field velocity measurement method based on fusion of light intensity and polarization information includes the following steps:

[0039] Step S102, camera calibration is performed based on the calibration plate images of the cameras at different shooting positions.

[0040] In applications such as machine vision, image measurement, photogrammetry, and 3D reconstruction, to correct lens distortion; determine the conversion relationship between physical size and pixel; and determine the relationship between the 3D geometric position of a point on the...

Embodiment 2

[0057] This embodiment provides another flow field velocity measurement method based on fusion of light intensity and polarization information, which is implemented on the basis of the above embodiment; from the perspective of signal analysis, the more input signals, the more effective information that can be obtained The more, and the stronger the ability to overcome the error interference of a single signal. This embodiment proposes to simultaneously acquire the light intensity information and polarization information of the tracer particle scattering information, fuse the light intensity information and polarization information to replace the single light intensity information, and perform cross-correlation calculations through time-correlated fused images to solve the single light intensity problem. The lack of information in the cross-correlation calculation improves the accuracy of the velocity field measurement based on the image.

[0058] Specifically, the flow field v...

Embodiment 3

[0089] Corresponding to the above-mentioned method embodiment, the embodiment of the present invention provides a flow field velocity measurement device based on fusion of light intensity and polarization information, which is applied to the flow field velocity measurement system, see Figure 9 Shown is a schematic structural diagram of a flow field velocity measurement device based on fusion of light intensity and polarization information. The flow field velocity measurement device based on fusion of light intensity and polarization information includes:

[0090] Calibration plate image determination module 91, for camera calibration based on the calibration plate images of cameras at different shooting positions;

[0091] The wind tunnel operation module 92 is used to run the wind tunnel, adding nanoparticles to the upstream of the wind tunnel to follow the movement of the flow field;

[0092] The image acquisition module 93 is used to collect the time-correlated grayscale i...

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Abstract

The invention provides a flow field velocity measurement method and device based on fusion light intensity and polarization information. The method includes the steps of performing camera calibration based on calibration plate images of cameras at different shooting positions; operating a wind tunnel, and adding nanoparticles on the upstream of the wind tunnel to move along with the flow field; when the laser illuminates the flow field based on the working time sequence of the laser, enabling the CCD camera and the polarization camera to respectively acquire a time-dependent gray image and a time-dependent polarization image of the nanoparticles; determining a polarization result based on the polarization image; carrying out image fusion on the polarization result and the grayscale image to obtain a fused image; and calculating velocity information of the flow field based on the fused image. According to the method and device, the light intensity information and the polarization information of the scattering information of the tracer particles can be obtained at the same time, the light intensity information and the polarization information are fused to replace single light intensity information, cross-correlation calculation is carried out through the fused images related to time, the defects of the single light intensity information in cross-correlation calculation are overcome, and the precision of velocity field measurement based on the images is improved.

Description

technical field [0001] The invention relates to the technical field of wind tunnel experimental measurement and image processing, in particular to a flow field velocity measurement method and device based on fusion of light intensity and polarization information. Background technique [0002] Velocity distribution measurement of supersonic / hypersonic flow field is an important content in aerodynamic research. At present, there are a variety of supersonic / hypersonic flow field velocity measurement technologies, including Particle Image Velocimetry (PIV), hot wire anemometer, Pitot tube, Laser Doppler Velocimetry (LDV), molecular markers Velocimetry (Molecular Tagging Velocimetry, MTV) and other technologies as representatives. [0003] Among them, although the MTV and LDV methods can measure the spatial distribution of the velocity field, these methods have low spatial resolution and cannot obtain the spatial velocity distribution of the high-resolution flow field. The part...

Claims

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Application Information

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IPC IPC(8): G01M9/06G01P5/26
CPCG01M9/06G01P5/26
Inventor 何霖吴争邦陆小革韩俊豪
Owner NAT UNIV OF DEFENSE TECH