Deformation measurement using high resolution Moiré photography |
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Authors: | C. Forno |
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Affiliation: | National Physical Laboratory, Teddington, Middlesex TW11 OLW, UK |
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Abstract: | By installing a slotted mask inside the lens of a 35 mm camera the response can be tuned to resolve 300 lines/mm. The camera is used to record changes in fine grid patterns applied to engineering structures and by analysing the processed negatives in a spatial filtering system, moiré fringe maps are generated representing in detail the separate x and y displacements that have occured. Measurements have been obtained from materials ranging from concrete to soft plastics and a variety of patterns is described for treating most surfaces. |
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