A combined experimental with simulation approach to calibrated 3D strain measurement using shearography

This paper is concerned with the development of a calibrated 3D shearography strain measurement instrument, calibrated iteratively, using a combined mechanical-optical model and specially designed test objects. The test objects are a cylinder loaded by internal pressure and a flat plate under axial load. Finite element models of the samples,...

Shearography technology and applications: A review

Shearography is a full-field speckle interferometric technique used to determine surface displacement derivatives. For an interferometric technique, shearography is particularly resilient to environmental disturbances and has hence become an invaluable measurement tool outside of the optics laboratory. Furthermore, the inclusion of additional...

Error analysis of 3D shearography using finite-element modelling

This paper describes the development of an opto-mechanical simulation of a complete shearography system, including the shearography instrument, the samples and the test environment. This simulation is applied to the measurement of 3D strains in engineering samples. The samples are a cylinder loaded by internal pressure and a flat plate under...

2.5D virtual reality visualisation of shearography strain data from a canvas painting

Advanced measurement techniques for the structural diagnostics of artwork are increasingly providing more complex data that needs to be conveyed to conservators in a meaningful way. Holography and speckle interferometry based sensors are commonly used for this application and of these shearography is quite suitable for measurements outside the...

Multi-sensor evaluation of a wooden panel painting using terahertz imaging and shearography

Cultural heritage objects are increasingly being investigated using advanced non-destructive optical measurement techniques. Holographic and speckle interferometry based instrumentation allow dimensional measurement of objects at the tens of nanometer scale. For the structural diagnostics of artwork, double-exposure techniques are often used to...

RF potential of a 0.18-µm CMOS logic device technology

A digital program for one-line correlation and power spectral density analysis

Usual procedures for the recording and analysis of analog data are summarized and a technique for on-line correlation and spectrum analysis by means of a small digital computer with analog input and graphic output capability is described. This technique was programmed in FORTRAN II for an SDS 920, and special emphasis was placed on ease of use...