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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 7 — Mar. 1, 2011
  • pp: 1014–1022

Mechanical stress measurement by an achromatic optical digital speckle pattern interferometry strain sensor with radial in-plane sensitivity: experimental comparison with electrical strain gauges

Matias R. Viotti, Armando Albertazzi G., Jr., and Walter A. Kapp  »View Author Affiliations


Applied Optics, Vol. 50, Issue 7, pp. 1014-1022 (2011)
http://dx.doi.org/10.1364/AO.50.001014


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Abstract

This paper shows the optical setup of a radial in-plane digital speckle pattern interferometer which uses an axis-symmetrical diffractive optical element (DOE) to obtain double illumination. The application of the DOE gives in-plane sensitivity which only depends on the grating period of the DOE instead of the wavelength of the laser used as illumination source. A compact optical layout was built in order to have a portable optical strain sensor with a circular measurement area of about 5 mm in diameter. In order to compare its performance with electrical strain sensors (strain gauges), mechanical loading was generated by a four-point bending device and simultaneously monitored by the optical strain sensor and by two-element strain gauge rosettes. Several mechanical stress levels were measured showing a good agreement between both sensors. Results showed that the optical sensor could measure applied mech anical strains with a mean uncertainty of about 5% and 4% for the maximum and minimum principal strains, respectively.

© 2011 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(090.1995) Holography : Digital holography
(120.6165) Instrumentation, measurement, and metrology : Speckle interferometry, metrology

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: November 23, 2010
Manuscript Accepted: January 4, 2011
Published: February 24, 2011

Citation
Matias R. Viotti, Armando Albertazzi G., Jr., and Walter A. Kapp, "Mechanical stress measurement by an achromatic optical digital speckle pattern interferometry strain sensor with radial in-plane sensitivity: experimental comparison with electrical strain gauges," Appl. Opt. 50, 1014-1022 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-7-1014

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