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An appraisal and developments of laser holography for interferometric engineering measurement

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thesis
posted on 22.11.2018, 12:29 by David Denby
Holography is a two-stage method of imagery in which both amplitude and phase information characterizing a wavefront are recorded, and subsequently reconstructed. Only with the advent of laser light sources in the early 1960s did the method become practical, motivating research into applications. One of these, holographic interferometry, was based on the fact that a reconstructed wavefront from a hologram could be used as a reference for interferometric comparison. This enabled interferometry to be extended to objects having scattering surfaces of any shape, and the potential of the method in engineering measurement was considered to be high. A literature survey carried out at the start of this project (1967 to 1968), and reported in Chapter 2, revealed that many potential applications in the fields of stress analysis, vibration analysis, fault detection in materials and structures, and dimensional inspection, had been proposed but were not quickly materializing. This was seen to be partly due to practical difficulties necessitating laboratory procedures, and partly due to difficulties in analysing interferograms to obtain specific measurements. Accordingly, the aims of this project were: (i) to develop apparatus and methods that would simplify and improve the practice of holographic interferometry and the interpretation of results; (ii) to investigate fringe interpretation, and to assess the accuracy and general feasibility, in relation to practical measurements of surface deformation. [Continues.]

Funding

Science Research Council.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Publisher

© David Denby

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

1973

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy at Loughborough University.

Language

en

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