New speckle technique for noncontact measurement of small creep rates

Donald Dean Duncan; F. Fausten Mark; Lawrence W. Hunter

doi:10.1117/12.57679

1 July 1992 New speckle technique for noncontact measurement of small creep rates

Donald Dean Duncan, F. Fausten Mark, Lawrence W. Hunter

Author Affiliations +

Optical Engineering, Vol. 31, Issue 7, (July 1992). https://doi.org/10.1117/12.57679

Abstract

A highly sensitive method for measuring thermal expansion, mechanical strain, and creep rates has been developed. This technique is based on Yamaguchi's speckle strain gauge concept, but uses a novel data-processing approach that provides estimates of the time rate of in-plane strain. The approach is appropriate for assessing very small strain rates in hostile environments. It provides simultaneous global estimates of the strain at both small and large gauge sizes. This may be of importance in studying materials with different short- and long-range orders. General advantages of the technique are compact design, modest resolution requirements, insensitivity to surface microstructure changes (as seen with oxidation), and relative insensitivity to zero-mean noise processes such as turbulence and vibration.

Citation Download Citation

Donald Dean Duncan, F. Fausten Mark, and Lawrence W. Hunter "New speckle technique for noncontact measurement of small creep rates," Optical Engineering 31(7), (1 July 1992). https://doi.org/10.1117/12.57679

Published: 1 July 1992

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available