A MOIRE' OPTICAL SYSTEM FOR QUANTITATIVE BOUNDARY LAYER MEASUREMENTS.

Abstract

The modification of a single pass schlieren system, to obtain quantitative data (density gradient) by using Moire' patterns to measure the refractive index gradient presents a new simple and inexpensive optical system to assist in analyzing boundary layers. This paper includes a study of the effects of ruling line density and misalignment upon the measurements, and a feasibility study and verification test of the two dimensional capabilities on a cylinder. Set-up and alignment, and data reduction procedures are detailed. The system has yielded highly reproduceable results; the temperature gradient on a heated vertical flat plate was measured with an average deviation of less than 2% and less than 10% was obtained for a cylinder. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0836802

Entities

People

  • Thomas F. Hamm

Organizations

  • Air Force Institute of Technology

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Data Reduction
  • Feasibility Studies
  • Isotherms
  • Layers
  • Measurement
  • Misalignment
  • Refractive Index
  • Temperature Gradients
  • Two Dimensional
  • Verification
  • Verification Tests

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Fluid Dynamics.
  • Nanofabrication and Microfabrication.