Strain and torque measurements on cylindrical objects using the laser speckle strain gauge

Mikael Sjoedahl; Ichirou Yamaguchi

doi:10.1117/1.600606

1 April 1996 Strain and torque measurements on cylindrical objects using the laser speckle strain gauge

Mikael Sjoedahl, Ichirou Yamaguchi

Optical Engineering, Vol. 35, Issue 4, (April 1996). https://doi.org/10.1117/1.600606

First, the theory of diffraction field speckle displacement is extended to include speckle patterns arising from a cylindrical object subject to general deformation. Second, the usefulness of the derived relations are demonstrated by measuring the axial strain component on a Teflon cylinder and torque (shear strain) on a twisted steel cylinder. We performed real-time measurement of these quantities using the setup adopted for the laser speckle strain gauge. With this equipment, we obtained resolutions of 37.5 µ strain in the axial strain measurement and of 1.8 N m in the torque measurement. Both experiments agreed within 4% with simultaneous results obtained from an electrical strain gauge and with the known applied torque.

Citation Download Citation

Mikael Sjoedahl and Ichirou Yamaguchi "Strain and torque measurements on cylindrical objects using the laser speckle strain gauge," Optical Engineering 35(4), (1 April 1996). https://doi.org/10.1117/1.600606

Published: 1 April 1996

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