Chinese Science Bulletin

, Volume 55, Issue 31, pp 3545–3549

Aero-optical aberration measuring method based on NPLS and its application

  • ShiHe Yi
  • LiFeng Tian
  • YuXin Zhao
  • Lin He
  • Zhi Chen
Article Fluid Mechanics

DOI: 10.1007/s11434-010-4104-5

Cite this article as:
Yi, S., Tian, L., Zhao, Y. et al. Chin. Sci. Bull. (2010) 55: 3545. doi:10.1007/s11434-010-4104-5

Abstract

The existing methods for measuring aero-optical aberration suffer from several problems, such as low spatiotemporal resolution, sensitivity to environment, and integral effects. A new method for measuring aero-optical aberration of supersonic flow is proposed. Based on the self-developed measuring method of supersonic density field, the wavefront aberration induced by a cross-section of supersonic flow field could be measured by ray-tracing. Compared with other methods, the present one has three significant innovations: (1) high spatiotemporal resolution. Its time resolution is 6 ns, and the spatial resolution can reach up to micrometers; (2) it can avoid the integral effects and study the wavefront aberration induced by the flow field of interest locally; (3) it can also avoid the influence from the test section wall boundary layers and environmental disturbances. The present method was applied to supersonic flow around an optical bow cap. The results of high spatiotemporal resolution reveal fine wavefront structures, and show that shock waves, expansion waves and turbulent boundary layers have different impacts on the wavefront aberration.

Keywords

NPLSsupersonic flow fieldaero-optics

Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • ShiHe Yi
    • 1
  • LiFeng Tian
    • 1
  • YuXin Zhao
    • 1
  • Lin He
    • 1
  • Zhi Chen
    • 1
  1. 1.College of Aerospace and Material EngineeringNational University of Defense TechnologyChangshaChina