
Proceedings Paper
A comparative study between deflectometry and shearography for detection of subsurface defectsFormat | Member Price | Non-Member Price |
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Paper Abstract
Nondestructive testing of objects is the basis for quality control in a production line. There exists a wide range of optical
and tactile methods for the detection of surface defects. For hidden defects (below the surface) different methods like Xray
or ultrasound are state of the art; also, optical methods like thermography and interferometry can be used in
combination with a load. This load can be mechanical, electrical or thermal and is used to produce a measurable signal
(deviation of the surface, thermal signature) on the surface. Typically, the surface or the surface gradient of a specimen
in a loaded and an unloaded state is measured and the two results are compared afterwards or in real time. The evaluation
of shape differences is easier than measuring absolute shapes because systematic errors (e.g. calibration) cancel
themselves out and the resolution mostly depends on the measurement system’s sensitivity.
In this paper we give an overview of the different parameters influencing the successful implementation of optical nondestructive
testing (ONdT) methods. In a second step, we compare shearography and deflectometry, identify relevant
parameters and show restrictions of both methods with regard to the systems used. We present measurements with
different methods and show how these results can be compared. We discuss the feasibility of both methods and the
applicability of the systems used in a production line with respect to parameters concerning the quality control of
produced goods.
Paper Details
Date Published: 18 August 2014
PDF: 12 pages
Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 92030C (18 August 2014); doi: 10.1117/12.2063650
Published in SPIE Proceedings Vol. 9203:
Interferometry XVII: Techniques and Analysis
Katherine Creath; Jan Burke; Joanna Schmit, Editor(s)
PDF: 12 pages
Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 92030C (18 August 2014); doi: 10.1117/12.2063650
Show Author Affiliations
Philipp Huke, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Jan Burke, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Jan Burke, Bremer Institut für angewandte Strahltechnik GmbH (Germany)
Published in SPIE Proceedings Vol. 9203:
Interferometry XVII: Techniques and Analysis
Katherine Creath; Jan Burke; Joanna Schmit, Editor(s)
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