Abstract This paper deals with the reconstruction of the inlet temperature profile of a melted polyethylene (PE) flowing through an extrusion die. The inverse heat transfer problem is formulated as an optimisation problem by considering both the energy and the Navier-Stokes equations. It is solved by using the conjugate gradient algorithm. Experimental results are presented and show the effect ...

A vision-based measurement system for the online inspection of automotive rubber profiles is described. The system determines a 3-D reconstruction of the rubber profile section and performs dimensional measurements. After a brief description of the whole measurement system, the main novelties are pointed out: the simple calibration procedure and the flexible tools allowing users to specify the ...

This study describes a hybrid technique for identification of buried objects. The object’s shape and electromagnetic profile are reconstructed from evaluations of electrical permittivity and conductivity. The method suggests a combination of linear sampling and optimization. Linear sampling method (LSM) is used to recover shape and metaheuristic optimizations essential to reconstruct the inside...

Motivated by the requirements of the present archaeology, we are developing an automated documentation system for archaeological classification and reconstruction of ceramics. Our system works with the profile of an archaeological fragment, which is the cross-section of the fragment in the direction of the rotational axis of symmetry. Ceramic fragments are recorded automatically by a 3D-measure...

We consider the problem of determining material loss due to corrosion in a plate. Eddy current data are collected on one side of the plate with corrosion damage occurring on the opposite side. Our work is based on linearizing the relationship between eddy current loop impedance change with the loss profile. In this context, we show that eddy current data are sufficient to uniquely determine the...

Abstract – A new and accurate refractive index profile synthesis method for optical waveguides is demonstrated using the transmitted near electric field data. This method is based on an inverse transmission line technique. From Maxwell’s equations, we derive a transmission line equivalent circuit for the refractive index profile of a cylindrical dielectric waveguide. We demonstrate how to use t...

The experimental validation of a numerical technique for temperature/strain profile reconstruction based on Brillouin optical-fibre time-domain analysis (BOTDA) sensors is presented. In this approach, we search directly for the Brillouin frequency shift profile along the fibre that matches the measured data. The algorithm is based on a harmonic expansion of the unknown profile, whose coefficien...

In digital holography (DH) the numerical reconstruction of the whole wavefront allows one to extract the wrapped phase map mod, 2 pi. It can occur that the reconstructed wrapped phase map in the image plane is undersampled because of the limited pixel size in that plane. In such a case the phase distribution cannot be retrieved correctly by the usual unwrapping procedures. We show that the use ...

Abstract—Ramp response technique in low frequency can be used for generating 3-dimensional images of radar targets (even stealthy or buried targets) so as to identify them. This technique uses the target profile function, which is defined as its transverse crosssectional area versus distance along the observing direction. For mutually orthogonal observing views, reconstructed 3D images are quit...

This article considers a hypothetical imaging device with a spinning slat collimator that measures parallel-planar-integral data from an object. This device rotates around the object 180 degrees and stops at N positions uniformly distributed over this 180 degrees. At each stop, the device spins on its own axis 180 degrees and acquires measurements at M positions uniformly distributed over this ...