This paper reports a new technique, namely the incremental micro-hole-drilling method
(IμHD) for mapping in-plane residual or applied stresses incrementally as a function of depth …

This paper presents the evaluation of a method to cancel rigid body displacements that can
be introduced when a hole drilling and digital speckle pattern interferometry (DSPI) …

Holographic interferometry is a typical optical method for the measurement of displacement.
However, it is the first or second derivative of displacement in many cases that is of interest …

Using laser generated speckles for displacement and strain analysis has generated a
considerable interest in recent years. In particular the branch of techniques, which is based …

The basic equations for the evaluation of surface displacement, strain and stress from
holographic interferograms are derived. The object shape and the geometry of the optical …

Hole-drilling is a widely accepted method for determining residual stresses from the
relaxation data obtained by a strain-gage rosette. Several researchers have recently …

The depth and diameter of the drilled hole are inputs to the calculation of the stress, and the
ability to control these parameters affects the overall accuracy of the technique, as …

Presently, conventional geomechanical stress measuring instruments can only provide
measurements at a single point. A fiber-optic (FO) based stress-sensor has the potential to …

Full-field optical measuring techniques are increasingly being used in industry as
development and design tools and for production inspection. Techniques such as moiré and …

Described is a technique for optically subtracting the phase terms in holographic
interferometry to yield fringe patterns showing the differences between a master object and …