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Experimental Mechanics

, Volume 23, Issue 2, pp 190–195 | Cite as

The monomode fiber—A new tool for holographic interferometry

Monomode and multimode fibers with step-index profiles are used as tools to measure surface displacement by holographic interferometry
  • J. A. Gilbert
  • T. D. Dudderar
  • M. E. Schultz
  • A. J. Boehnlein
Article

Abstract

Monomode fibers are used to minimize modal interactions which ordinarily occur during holographic deformation studies based on multimode fiber-optic access. Test results show that holograms have better diffraction efficiency than those generated using multimode fibers and that stringent requirements for vibration isolation associated with holographic testing can be somewhat relaxed.

Keywords

Mechanical Engineer Fluid Dynamics Modal Interaction Diffraction Efficiency Stringent Requirement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Symbols

a

radius of plate

aj

modal amplitude

d

displacement vector

\(\bar d_i \)

inner diameter of pipe

d0

outer diameter of pipe

\(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{\hat e} _{ i} \)

unit vector in the direction of propagation

ej

modal field

h

thickness of plate

n

fringe-order number

ncl

index of refraction of cladding

nco

index of refraction of core

r, θ,Z

cylindrical coordinates

x,y,z

Cartesian coordinates

E

Young's modulus

\(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{E} ,\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{E} _B ,\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{E} _U \)

propagation modes

L

length of pipe

MMB

coherent multimode fiber bundle

MT

applied torque

NA

numerical aperture

P

applied load

SMB

coherent monomode fiber bundle

Uθ

tangential component of displacement

V

dimensionless waveguide parameter

W

displacement component along the line of sight

βj

propagation constant

δ

core to cladding index difference

θc

critical angle

λ

wavelength

ν

Poisson's ratio

ϱ

radius of fiber core

ϕ(Z)

angle of twist

ω

angular velocity

length of fiber

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Copyright information

© Society for Experimental Mechanics, Inc. 1983

Authors and Affiliations

  • J. A. Gilbert
    • 1
  • T. D. Dudderar
    • 2
  • M. E. Schultz
    • 1
  • A. J. Boehnlein
    • 1
  1. 1.Department of Civil EngineeringUniversity of Wisconsin-MilwaukeeMilwaukee
  2. 2.Bell LaboratoriesMurray Hill

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