High-temperature digital image correlation method for full-field deformation measurement captured with filters at 2600 degree C using spraying to form speckle patterns

A method is presented for obtaining good images of a sprayed speckle pattern on specimen surfaces at high temperatures, suitable for strain measurement, by digital image correlation (DIG) using plasma spray for speckle preparation in which a bandpass filter, neutral density filters, and a linear pol...

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Bibliographic Details
Published in:Optical engineering 2014-06, Vol.53 (6), p.np-np
Main Authors: Guo, Xiang, Liang, Jin, Tang, Zhengzong, Cao, Binggang, Yu, Miao
Format: Article
Language:English
Subjects:
Correlation analysis
Deformation
Density
Digital
Speckle patterns
Sprayers
Sprays
Online Access:Get full text
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Summary:A method is presented for obtaining good images of a sprayed speckle pattern on specimen surfaces at high temperatures, suitable for strain measurement, by digital image correlation (DIG) using plasma spray for speckle preparation in which a bandpass filter, neutral density filters, and a linear polarizing filter are used to reduce intensity and noise in images. This is accomplished by speckle preparation through the use of plasma spray and suppression of black-body radiation through the use of filters. By using plasma spray for speckle preparation and the filters for image acquisition, the method was demonstrated to be capable of providing accurate DIG measurements up to 2600 degree C. The full-field stretching deformation of the specimen was determined using the DIG technique. Experimental results indicate that the proposed high-temperature DIG method is easy to implement and can be applied to practical, full-field, high-temperature deformation measurements with high accuracy.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.53.6.063101