Sensitivity and optimization in the determination of deformations by holographic interferometry

The use of a fringe-counting holographic interferometric technique for measuring small superficial displacements can present difficulties in determining the measurement inaccuracy. A useful general method is given here for the analysis of errors in displacement measurements. The optimum number and t...

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Bibliographic Details
Published in:Optics and laser technology 1988-10, Vol.20 (5), p.269-273
Main Authors: Dalmases, F., Salvador, R., Buendía, M., Romero, C., Cibrían, R., Gandía, J.L.
Format: Article
Language:English
Subjects:
errors
Exact sciences and technology
fringes
holographic interferometry
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Interferometers
Optical instruments, equipment and techniques
orthodontics
Physics
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Summary:The use of a fringe-counting holographic interferometric technique for measuring small superficial displacements can present difficulties in determining the measurement inaccuracy. A useful general method is given here for the analysis of errors in displacement measurements. The optimum number and type of observation directions are determined and correspond to counting in the four semi-diagonals of the holographic plate. The technique, as applied to skull experiments, makes it possible to measure directly displacements of up to 20 μm, in the object plane parallel to the holographic plate. The associated errors range from 0.1–0.3 μm, for a counting inaccuracy of 1 8 – 1 4 of a fringe and increments of traction of 100 g to 1 kg of force.
ISSN:0030-3992
1879-2545
DOI:10.1016/0030-3992(88)90030-8