Experimental Mechanics

, Volume 12, Issue 5, pp 216–222 | Cite as

Application of profile projectors to moiré analysis

Attachment of adjustable screen grids in the image plane of two profile projectors makes them sensitive and accurate instruments for moiré measurements in the elastic range of most materials
  • A. R. Luxmoore
Article

Abstract

Two profile projectors have been modified for moiré applications by the addition of adjustable screens which contain magnified master grids. The instruments have been examined for any errors they may introduce into the measurements and the screen adjustments have been calibrated. Their use and application are described briefly.

Keywords

Mechanical Engineer Fluid Dynamics Profile Projector Master Grid Adjustable Screen 

Notation

p

pitch of specimen grid before straining

δp

change in pitch of specimen grid

P

pitch of magnified specimen grid

P

pitch of master grid in image plane

M

basic magnification of optical system

m

change in magnification of optical system

E

mismatch strain

F

fringe spacing in image plane

e

strain in specimen

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References

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Copyright information

© Society for Experimental Mechanics, Inc. 1972

Authors and Affiliations

  • A. R. Luxmoore
    • 1
  1. 1.Department of Civil EngineeringUniversity CollegeSwanseaUK

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