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Microstructural strain analysis by high magnification moiré interferometry
Loughborough University.
Cavendish Laboratory.
Cavendish Laboratory.
Luleå tekniska universitet.
1995 (English)In: Interferometry VII: Applications, Bellingham, Wash: SPIE - International Society for Optical Engineering, 1995Conference paper, Published paper (Refereed)
Abstract [en]

A high magnification phase-stepping interferometer has been constructed which has a spatial resolution of the order of one micrometers and a sub-mm field of view. Laser illumination is delivered to the microscope head by polarization-preserving single-mode optical fibers. The head itself is a compact unit consisting of collimating optics, objective lens, CCD camera, and a separate white light source. Phase gratings are cast on the polished specimen surface by replication from a master grating, in either silicone rubber or epoxy resin. Subsequent evaporation of a thin layer of gold onto the grating increases the reflectivity and reduces the speckle noise in the images. By switching between the laser illumination and the white light unit, it is possible to view the underlying microstructure in exact registration with the measured displacement fields. The instrument is illustrated with several applications including the visualization of delamination cracks in graphite-epoxy composites and measurement of the strain-to-failure of polymer-bonded-explosives.

Place, publisher, year, edition, pages
Bellingham, Wash: SPIE - International Society for Optical Engineering, 1995.
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 2545
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-28449DOI: 10.1117/12.212633Local ID: 24099cd0-01f4-11dc-ad0a-000ea68e967bISBN: 9780819419040 (print)OAI: oai:DiVA.org:ltu-28449DiVA, id: diva2:1001646
Conference
Interferometry VII : 13/07/1995 - 14/07/1995
Note
Godkänd; 1995; 20070514 (cira)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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