THE INTERFEROMETRIC STRAIN GAGE

Abstract

The interferometric strain gage consists of two very shallow grooves rules on a highly polished surface. The grooves are cut with a diamond and are .00004 inches deep and .005 apart. Coherent, monochromatic light from a He-Ne gas laser incident upon these grooves will produce fringe patterns. A fringe pattern with the fringes parallel to the grooves is formed on each side of the impinging beam. The position of these patterns in space is related to the distance between the two grooves. As this distance changes, the fringes shift. Measurement of these fringe-shifts enables one to determine the local strain of the specimen.

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Document Details

Document Type
Technical Report
Publication Date
Jan 04, 1968
Accession Number
AD0701186

Entities

People

  • W. N. Sharpe Jr.

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Cameras
  • Contracts
  • Engineering
  • Films
  • Gages
  • Gas Lasers
  • Grain Size
  • Gratings (Spectra)
  • Intensity
  • Laser Beams
  • Machines
  • Materials
  • Measurement
  • Michigan
  • Monochromatic Light
  • Schematic Diagrams
  • Strain Gages

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Mechanical Engineering/Mechanics of Materials.
  • Spectroscopy.

Technology Areas

  • Directed Energy
  • Space