Computer Tomography and Hybrid Optical/Digital Methods for Aerodynamic Measurements.

Abstract

A hybrid optical/digital system has been developed to measure instantaneous, three-dimensional, density distributions in aerodynamic flows. The system uses a pulsed laser and discrete phase-step holographic interferometry, resulting in excellent phase resolution and a substantial level of automation of phase readout. The system uses reflection-, as well as transmission-, holography. Data are analyzed by computer tomography using a new algorithm (constrained iterative convolution) developed during this program. The entire system was used to study turbulent helium jets, disclosing their basic structures. Research also was conducted to develop methods for computer tomographic analysis when the optical probing rays are bent due to strong refraction, e.g., around shocks. Two iterative methods and a perturbation approach is recommended.

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Document Details

Document Type
Technical Report
Publication Date
Dec 28, 1987
Accession Number
ADA190909

Entities

People

  • C. M. Vest

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Air Platforms
  • Biomedical

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Science
  • Computers
  • Flow Visualization
  • Fluid Mechanics
  • Geometry
  • Image Processing
  • Lasers
  • Measurement
  • Military Research
  • Optical Properties
  • Optics
  • Pulsed Lasers
  • Refraction
  • Refractive Index
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Image Processing and Computer Vision.
  • Systems Analysis and Design

Technology Areas

  • Directed Energy