Strain measurement by three-dimensional electronic speckle pattern interferometry: potentials, limitations, and applications

2003 ◽  
Vol 42 (5) ◽  
pp. 1257 ◽  
Author(s):  
Andreas Ettemeyer
Keyword(s):  
Strain Measurement ◽  
Speckle Pattern ◽  
Three Dimensional ◽  
Electronic Speckle Pattern Interferometry

Electronic Speckle Pattern Interferometry of the Vibrating Larynx

1995 ◽  
Vol 104 (1) ◽  
pp. 5-12 ◽  
Author(s):  
Glendon M. Gardner ◽  
Michelle Conerty ◽  
James Castracane ◽  
Steven M. Parnes
Keyword(s):  
Real Time ◽  
Quantitative Research ◽  
Speckle Pattern ◽  
Three Dimensional ◽  
Vocal Folds ◽  
Digital Data ◽  
Electronic Speckle Pattern Interferometry ◽  
Clinical Tool ◽  
Digital Hardware ◽  
Laser Holography

Laser holography is a technique that creates a three-dimensional image of a static object. This technique can be applied to the analysis of vibrating structures. Electronic speckle pattern interferometry uses a laser for illumination of the vibrating object and solid state detectors and digital hardware technology for capturing and processing the image in real time. This was performed on a human cadaver larynx and is the first time an interferogram of vibrating vocal cords has ever been obtained. Dark and bright interference fringes are seen that represent the vibratory motion of the vocal folds. These are presented in still photos as well as real-time on videotape. This method can provide advantages over current techniques of laryngeal study: it is sensitive to motion in the vertical dimension, and the digital data can be quantitatively analyzed. Application of this technique to study the larynx should eventually be a valuable clinical tool and provide quantitative research data.

Mechanical Property Mapping Using Image Correlation and Electronic Speckle Interferometry

2004 ◽  
Vol 1-2 ◽  
pp. 147-152 ◽  
Author(s):  
Joao Quinta da Fonseca ◽  
Michael Preuss ◽  
P. Ryan ◽  
Philip J. Withers
Keyword(s):  
Tensile Test ◽  
Strain Measurement ◽  
Mechanical Test ◽  
Speckle Pattern ◽  
Measurement Techniques ◽  
Weld Line ◽  
Surface Strain ◽  
Image Correlation ◽  
Electronic Speckle Pattern Interferometry ◽  
Proof Stress

By combining modern surface strain measurement techniques with the traditional tensile test mechanical test, a method has been developed whereby the mechanical properties of a test sample with a heterogeneous microstructure such can be characterised in one test. In this paper the applicability to such a method of two such surface strain measurement techniques, image correlation (IC) and electronic speckle pattern interferometry (ESPI), is assessed. Two commercially available systems were used to monitor, simultaneously, the surface strain on tensile test specimens during testing. Measurements on homogeneous samples were compared with measurements made using strain gauges and excellent agreement was found. Elastic modulus and proof stress values measured in these standard samples showed that the uncertainty in the measurements was below 10%. The method was then applied to an inertia friction weld, whose strength varied linearly as a function of distance from the weld line. The values of proof stress obtained were compared with micro-hardness measurements.

Investigation of three-dimensional deformations of corroding natural stones using electronic speckle pattern interferometry

1990 ◽  
Author(s):  
Gerd Guelker ◽  
Olaf Haack ◽  
Klaus D. Hinsch ◽  
Claudia Hoelscher ◽  
Juergen Kuls ◽  
...  
Keyword(s):  
Speckle Pattern ◽  
Three Dimensional ◽  
Electronic Speckle Pattern Interferometry ◽  
Natural Stones

A Study on Measurement of Welding Residual Stress Using ESPI System

2006 ◽  
Vol 324-325 ◽  
pp. 859-862 ◽  
Author(s):  
Kyung Su Kim ◽  
Seung Bok Choi ◽  
Jang Hyun Lee ◽  
Seong Mo Park ◽  
Beom Il Kim ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Speckle Pattern ◽  
Three Dimensional ◽  
Welding Residual Stress ◽  
Electronic Speckle Pattern Interferometry ◽  
Fe Model ◽  
Analysis Model ◽  
Element Analysis ◽  
The Difference ◽  
Welding Procedure

In this study, an experimental method has been studied to measure the residual stresses on a specimen with I-groove weldment. The specimens were extracted from I-groove weldment which was joined by SAW (Submerged Arc Welding) with CO2 shield gas. A FEA (Finite Element Analysis) model was developed for the estimation of the residual stresses for the specimen. Measurements were carried out using ESPI(Electronic Speckle Pattern Interferometry) system which can measure the strain distribution on the surface of specimen. The residual stresses were estimated by the value of strain measured by ESPI system. Strain gages were added to evaluate the accuracy of ESPI system. In addition, a three-dimensional FE model was used to estimate the residual stresses generated by the welding procedure. A thermal elasto-plastic analysis was performed by the FEA. The stresses measured by the experiments were compared with the results of FEA. Also, discussed are the difference and agreement between the stresses obtained by experiments and FEA, respectively.

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