Attachable Interferometric Strain Gages.

Abstract

Laser based interferometry from tiny reflective indentations can be used to measure in-plane strain/displacement over a very short gage length (on the order of 100 um). If the specimen material is not reflective, then some other means of generating the interference patterns must be found. This report describes two kinds of attachable gages: plated acetate replicas of indentations and reflective foils that are indented after application. In either case, the gage is applied with the techniques used for foil resistance gages and the gage itself is very small. The manufacturing procedures are described. Keywords: Strain measurement, Interferometry, Short gage length.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1988
Accession Number
ADA192390

Entities

People

  • K. C. Wang
  • William N. Sharpe Jr.

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Electron Microscopes
  • Electron Microscopy
  • Grain Boundaries
  • High Temperature
  • Laser Beams
  • Materials
  • Measurement
  • Mechanical Properties
  • Microscopes
  • Microscopy
  • Modulus Of Elasticity
  • Physics Laboratories
  • Resistance
  • Scanning Electron Microscopes
  • Strain Gages
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy