Polarization imaging based supersonic/hypersonic flow field measurement method

A polarization imaging and hypersonic technology, which is applied in the direction of measuring devices, machine/structural component testing, instruments, etc., can solve the problems of quantitative measurement error and uneven light intensity of supersonic/hypersonic flow field, and achieve good anti-interference ability , high-precision effect

Active Publication Date: 2018-10-12
NAT UNIV OF DEFENSE TECH
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for measuring supersonic / hypersonic flow field based on polarization imaging to solve the technical problem that existing NPLS technology tends to produce large errors in the quantitative measurement of supersonic / hypersonic flow field due to the inhomogeneity of light intensity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarization imaging based supersonic/hypersonic flow field measurement method
  • Polarization imaging based supersonic/hypersonic flow field measurement method
  • Polarization imaging based supersonic/hypersonic flow field measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0041] Based on the existing NPLS-based technology, the present invention comprehensively utilizes the laser scattering characteristics of nanoparticles and polarization imaging technology, and rationally adjusts the polarization state of the incident ray polarization laser and the angular position between the polarization imaging system and the scattered light, and utilizes the polarization imaging system The polarization state of the nanoparticle scattering light in the supersonic / hypersonic flow field is measured, and the relationship between the particle scattering polarization state and the flow field parameters is used to realize the visualization and fine measurement of the flow field. A...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a polarization imaging based supersonic / hypersonic flow field measurement method. The method comprises the following steps: optimizing a line-biased laser light source for incident illumination such that the polarization degree of the incident line-biased laser is within a set threshold range; adjusting the polarization direction of the incident line-biased laser and the receiving angle of a polarization imaging system so as to make a scattering signal of nanoparticles at the imaging angle of the polarization imaging system strongest; using the polarization imaging system to image the supersonic / hypersonic flow field to obtain a polarization-related result of the scattered light signal of the nanoparticles, wherein the polarization-related result includes the polarization degree, the polarization angle, and the ellipsometric angle of the scattered light of the nanoparticles; and converting the density field of the supersonic / hypersonic flow field based on the polarization information to obtain density distribution of the supersonic / hypersonic flow field. The invention utilizes the polarization parameter information of the scattering signal of the nanoparticles to realize the visualization and fine measurement of the flow field, and has good anti-interference ability and high precision.

Description

technical field [0001] The invention relates to the technical field of flow field measurement, in particular to a method for measuring a supersonic / hypersonic flow field based on polarization imaging. Background technique [0002] The fine measurement of supersonic / hypersonic flow field is an important content of supersonic and hypersonic flow mechanism research. The aerodynamic performance of high-speed aircraft and the thermal protection of the aircraft surface are closely related to the supersonic / hypersonic flow structure outside the aircraft. It is necessary to study the flow structure through experiments to provide a basis for the design of the aircraft. [0003] Existing methods for supersonic / hypersonic flow structure measurement include schlieren, shadow, interference, particle image velocity field (PIV), filtered Rayleigh scattering (FRS) and laser-induced fluorescence (PLIF) and other methods (Fan Jiechuan. Modern Mobile Display Technology [M]. Beijing: National ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 何霖
Owner NAT UNIV OF DEFENSE TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap