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Nondestructive measurement of striation defect spacing using laser diffraction

Published online by Cambridge University Press:  31 January 2011

Dylan E. Haas  and
Dunbar P. Birnie III
Dylan E. Haas
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721–0012
Dunbar P. Birnie III*
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721–0012
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A simple method is presented for measuring the characteristic spacing between striation defects that sometimes develop when coatings are deposited by the spin-coating process. Striation defects, because of their substantial regularity of thickness variation, are able to diffract laser light. By measuring the diffraction angle, it is possible to determine a characteristic spacing that corresponds to the most dominant spatial frequency for the striation defects that have formed. This diffraction technique is compared with other methods for determining the average striation spacing. This noncontact characterization technique may also be applicable to other regularly or quasi-regularly spaced defect structures that appear in coatings or other materials. The limits and accuracy of this technique are discussed in detail.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3355 - 3360
Copyright
Copyright © Materials Research Society 2001

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