University of Technology of Troyes
Troyes, France

The University of Technology of Troyes is a French university, in the Academy of Reims. The UTT is part of the network of the three universities of technology, found by the University of Technology of Compiègne. Inspired by the American University of Pennsylvania in Philadelphia, these three universities are a French mixture between the universities of this country and its schools of engineers . They are indeed organized like the universities, temples of knowledge being based on the triptych teaching-research-valorization . Their teaching model is a mix between the North-American model and the French traditions: courses choice, separation of the courses, work directed and practical work . These three universities give thus an engineering degree equivalent to the Bac+5 formations of the French Grandes Ecoles. The UTT was founded in 1994 and inaugurated by Jacques Chirac. One of the first chairman of the university has been Thierry Breton , honorary Chairman of both Thomson and France Telecom, and former finance Minister from France. Wikipedia.

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A system and method are described for identifying a photographic camera model from a photograph taking the form of an optionally TIFF-compressed image and fulfilling a relationship between the expectation and the variance of the pixels of the image. This relationship is dependent, inter alia, on two parameters, c and d, and these two parameters determine a fingerprint characterising the camera model. The system includes an image processing device that can process the photograph to estimate parameters c and d. The system also includes a device for carrying out statistical hypothesis tests on the distribution of the pixels of the photograph and a statistical analysis device for determining if the photograph was taken by the camera model by comparing the c and d parameters obtained from the photograph and the known c and d parameters of the camera model.

A method for monitoring a degradation in an on-board device of an aircraft, comprising a step of comparing an abnormality score obtained for a given flight of said aircraft with a decision threshold (S) and a step of transmitting an alert in the event of said decision threshold (S) being exceeded, said decision threshold (S) being automatically determined for a given probability of alert Pa, corresponding to the probability of an alert being transmitted during the monitoring method when said on-board device is healthy, by means of a plurality of steps, including a step of reading the antecedent of the continuous adjusted division function for the value 1Peac, said antecedent corresponding to said decision threshold (S), with Peac being the elementary probability of exceeding the threshold for confirmation per k exceedances of threshold during n consecutive flights and being a function of the probability of alert Pa.

Barchiesi D.,University of Technology of Troyes
Optics Express | Year: 2012

The inverse problem for Surface Plasmon Resonance measurements [1] on a thin layer of aluminium in the Kretschmann configuration, is solved with a Particle Swarm Optimization method. The optical indexes as well as the geometrical parameters are found for the best fit of the experimental reflection coefficient in s and p polarization, for four samples, under three theoretical hypothesis on materials: the metal layer is pure, melted with its oxyde, or coated with oxyde. The influence of the thickness of the metal layer on its optical properties is then investigated. © 2012 Optical Society of America.

Honeine P.,University of Technology of Troyes
IEEE Transactions on Pattern Analysis and Machine Intelligence | Year: 2012

Kernel principal component analysis (kernel-PCA) is an elegant nonlinear extension of one of the most used data analysis and dimensionality reduction techniques, the principal component analysis. In this paper, we propose an online algorithm for kernel-PCA. To this end, we examine a kernel-based version of Oja's rule, initially put forward to extract a linear principal axe. As with most kernel-based machines, the model order equals the number of available observations. To provide an online scheme, we propose to control the model order. We discuss theoretical results, such as an upper bound on the error of approximating the principal functions with the reduced-order model. We derive a recursive algorithm to discover the first principal axis, and extend it to multiple axes. Experimental results demonstrate the effectiveness of the proposed approach, both on synthetic data set and on images of handwritten digits, with comparison to classical kernel-PCA and iterative kernel-PCA. © 2012 IEEE.

The present disclosure relates to a method for manufacturing end microlenses of individual optical fibres which are part of a bundle or a multi-core fibre, including depositing a drop of a photopolymerisable solution on a first end of the bundle; adapting the size of the drop; applying light centred on a predetermined wavelength onto a second end of the bundle in order to selectively polymerise the drop; rinsing the first end using a methanol solution in order to obtain a network of individual optical fibres, each one of which is provided with a microlens at the first end of the multi-core fibre, the microlenses being physically separated from one another. The disclosure additionally relates to a bundle of microlensed fibres obtained by the method, as well as to the use of such a bundle, for example in medical or multiplexed imaging and/or in the coupling of optical fibres.

The invention provides a multilayer structure comprising a dielectric substrate; a sticking layer that extends over a first face of the dielectric substrate; at least one layer of precious metal placed on the sticking layer, said sticking layer comprising a derivative of an alkylsilane, the layer of precious metal being applied by evaporation or by sputtering said precious metal. The invention also provides a method of fabricating said device based either on electron beam lithography, optical lithography or nanoimprint lithography.

University of Technology of Troyes | Date: 2014-06-06

An interferometric device: includes a separator, for separating a collimated beam (F0) into first (F1) and second (F2) incident beams; at least one transducer; and a transparent optical system, including at least three planar diopters (D1, D2, D3). The the transducer is based on plasmon resonance and in contact with the diopter (D1); the diopter (D2) has a network of nanostructures; the optical system and the separator being configured such that the beam (F1) and the beam (F2) undergo total internal reflection on the diopter (D1) and on the diopter (D3), respectively, prior to interfering on the diopter (D2) by total internal reflection and to forming an interferogram in which the central fringe is located at a convergence point (ZOPD).

The invention concerns an electronic method for extracting the amplitude E_(S )and the phase _(S )of an electrical signal in a synchronous detector, the signal containing a modulated part I_(mod )of the form I_(mod)E_(S )f(t)*cos(_(S)_(R)(t)), where _(R)(t) and f(t) are two known temporal modulation functions. The method comprises the following steps: multiplying the signal by two reference signals C(t) and S(t) constructed from _(R)(t) and f(t); integrating the resulting signals over a time t_(int); determining the amplitude and phase of said signal from the quantities X and Y resulting from the previous integrations. The method is characterised in that: said electrical signal is multiplied by C(t) and S(t) that can be decomposed on the same set of frequencies as those present in I_(mod). The invention also concerns the application of the above method in interferometric circuits and the use and execution of the above method.

University of Technology of Troyes | Date: 2014-09-26

An evanescent wave microspectrometer includes a planar diopter separating two transparent media, an optical sensor with a pixel array, and disposed in the second transparent medium, and an interference device disposed such that at least a part of the interference device is in contact with evanescent waves generated at the surface of the diopter. The micro-spectrometer also includes a memory storing a map having a set of set of data grids including the optical response of said sensor for a set of quasi-monochromatic wavelengths of a calibration light source, and a calculator configured to determine the spectrum () of a test light source configured to generate evanescent waves at the surface of the diopter, on the basis of the map and the optical response of the sensor.

University of Technology of Troyes | Date: 2011-10-21

A method, device, and system for assessing the quality of balance, the device comprising a plate for receiving the feet of a subject and mounted on a plurality of pressure sensors measuring vertical forces applied to the plate, wherein the method comprises the following steps: measuring, by the pressure sensors thereof, vertical forces applied to the plate, at least before and while the subject mounts the device; calculating, according to the measured values, parameters that are relevant for the assessment, including at least one parameter relating to at least one slowdown in the rise of the values measured by the pressure sensors thereof when the subject mounts the device.

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