KEYWORDS: Holograms, Digital holography, 3D metrology, Sensors, Holography, Beam splitters, Optical resolution, 3D image processing, Digital recording, Image processing
In this work we present an extension of the use of three different lasers and only one high resolution monochrome sensor.
Besides the advantage to obtain the 3D deformation in just two images it is now possible due the geometry of the optical
setup to obtain the strain gradients in the object. The system records two consecutive images where each one contains
three holograms in it. This configuration gives the opportunity to use long coherence length lasers which allows the
measurement of large object areas. A series of digital holographic interferograms are recorded for a particular metallic
sample during a well known mechanical deformation. From the system it is possible to obtain in just a couple of images
the orthogonal displacement components u, v and w and then the strain gradient maps. Latter gives more information
about the mechanical response for an object during a micro deformation.
In this work we present a sequential technique for temporal fringe pattern demodulation without
carrier. The technique presented here, uses a temporal frequency estimator to obtain the temporal
phase from a interferogram sequence. The restriction used to estimate the frequency is based on
second order potentials in order to obtain the temporal phase as a phase function in an space C2.
The importance of this technique to demodulate temporal fringe patterns without carrier is mainly
the simplification of experimental optical arrays in laboratory, where the experimental nature make
it difficult to introduce a carrier frequency. This work present an on development technique for
temporal demodulation, however, its projection on future work give us the possibility to obtain a
robust demodulation method for temporal interferograms. To demonstrate the performance of this
temporal fringe pattern demodulation technique, we are going to show a simulated interferogram
sequence to demodulate it with this technique.
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