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Application of fiber optics to speckle metrology—a feasibility study

The application of monomode and multimode fiber optics to laser-speckle metrology is evaluated using numerical- and optical-correlation techniques

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Abstract

The development of fiber optics provides a potential means of simplifying coherent-light-metrology techniques and, simultaneously, increasing their realms of applicability by suppressing the negative effects of hostile mechanical and thermal environments. This report describes a series of experiments which explore some of the possibilities for applying fiber optics to speckle metrology, and, at the same time, demonstrates the use of both photoelectronic-numerical and conventional optical systems for recording and correlating the resulting speckle fields.

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Abbreviations

BD :

bundle diameter

CW:

continuous wave

D :

diameter of laser beam

FD :

fiber diameter

LSP:

laser-speckle photography

MMB:

coherent-multimode (fiber) bundle

NA :

numerical aperture

R :

displacement to speckle-size ratio,x/σ

S :

normalized speckle size, σ/FD

SMF:

a single-mode fiber

d :

diameter of illuminated area on test surface

l :

distance from end of SMF to illuminated area on test surface

n i :

core index of refraction

n 0 :

cladding index of refraction

x :

displacement of the test surface

z :

distance from test surface to the input end of the MMB

Δ:

index difference,n i − n 0

λ:

wavelength

σ:

objective speckle size

θ:

SMF-propagation cone angle

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Authors and Affiliations

  1. Bell Laboratories, 07974, Murray Hill, NJ

    T. D. Dudderar (Technical Staff Member)

  2. University of Wisconsin-Milwaukee, 53201, Milwaukee, WI

    J. A. Gilbert (Associate Professor of Engineering Mechanics)

  3. University of Wisconsin-Milwaukee, 53201, Milwaukee, WI

    A. J. Boehnlein (Research Assistant) & M. E. Schultz (Research Assistant)

Authors
  1. T. D. Dudderar
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  2. J. A. Gilbert
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  3. A. J. Boehnlein
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  4. M. E. Schultz
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Dudderar, T.D., Gilbert, J.A., Boehnlein, A.J. et al. Application of fiber optics to speckle metrology—a feasibility study. Experimental Mechanics 23, 289–297 (1983). https://doi.org/10.1007/BF02319255

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  • DOI: https://doi.org/10.1007/BF02319255

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