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Matière Molle & Verres
(122) Production(s) de l'année 2016
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New developments in ultrasound-modulated optical tomography made by heterodyne holography 
Auteur(s): Brodoline A., Donnarumma D., Gross M.
Conference: Digital Holography and Three-Dimensional Imaging 2016 (Heidelberg, DE, 2016-07-25)
Texte intégral en Openaccess : 
Ref HAL: hal-01927325_v1
DOI: 10.1364/dh.2016.dt1e.3
Exporter : BibTex | endNote
Résumé: Ultrasound-modulated optical tomography (UOT) is a technique that combines light and ultrasound able to image deep inside scattering media. A pulsed version of technique involving holography is proposed and discussed. Ultrasound-modulated optical tomography (UOT) [1] also called acousto-optic imaging [2] is a technique that combines light and ultrasound able to image deep inside scattering media. The ultimate goal of the technique is breast cancer imaging. Heterodyne holography combined with UOT is a powerful tool to detect the UOT tagged photons. Previous experiments are made with phantom samples. Since the sample does not move, the phase of the field remains correlated. Holographic detection is then efficient and shot noise sensitivity is reached [3]. To perform imaging with breast, a new setup with light and ultrasound pulses is proposed. Numerical simulations, that fits with the results of previous work, are made to extrapolate the phantom results to breast imaging with the new setup. They show that breast tumor imaging is possible. Fig. 1. Typical UOT setup (a) and pulsed modified setup to detect signal whose phase correlation is short (b). BS1, BS2: beam splitter; M: mirror; AOM1,AOM2: acousto optic modulator; PZT: piezoelectric transducer that generates the ultrasonic beam US; a: absorber imbedded in the diffusing sample; A: rectangular aperture; L: lens of focal d; C: camera; E LO , E T , E U : LO, tagged and untagged fields. Figure 1 (a) shows the heterodyne holography UOT setup of the phantom experiment [3]. The main laser beam L (frequency ω L) is split by the beam splitter BS1 into a local oscillator (LO), and a signal beam that is scattered by the diffusing sample. The sample is explored by an ultrasonic (US) beam of frequency ω US generated by a piezoelectric
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Studying open channels by digital holography
Auteur(s): Verrier N., Depreater L., Felbacq D., Gross M.
Conference: Digital Holography and Three-Dimensional Imaging 2016 (Heidelberg, DE, 2016-06-25)
Actes de conférence: Digital Holography and Three-Dimensional Imaging 2016, vol. p. (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01927313_v1
DOI: 10.1364/dh.2016.dth4c.2
Exporter : BibTex | endNote
Résumé: Open channels are peculiar incidents modes that are transmitted by a diffusing medium with high efficiency (up to 100%). Digital holography is used to analyze the correlations of the transmitted field, and to test open channel theory. Quantitative agreement is obtained.
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Rheology, microscopic dynamics and material failure in the creep of a colloidal gel
Auteur(s): Cipelletti L., Ramos L., Aime S.
Conference: Colloidal, Macromolecular & Biological Gels: Formulation, Properties & Applications (Schloss Hernstein, AT, 2016-07-10)
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Microscopic dynamics of polymer samples under tensile stress
Auteur(s): Cipelletti L.
Conférence invité: 3rd International Workshop on Nonlinear Response in Complex Matter (Primošten, HR, 2016-09-26)
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Microscopic dynamics and macroscopic rheology in a semi-crystalline polymer
Auteur(s): Cipelletti L.
Conférence invité: International Conference on Multiscale Materials Modeling (Dijon, FR, 2016-10-19)
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Scattering Techniques
Auteur(s): Cipelletti L. , Trappe Veronique, Pine D. J.
Chapître d'ouvrage: Fluids, Colloids And Soft Materials, vol. p.131-148 (2016)
Ref HAL: hal-01934656_v1
Exporter : BibTex | endNote
Résumé: Scattering techniques can average over many more particles than can direct methods and thus often provide much better quantitative measurements of the average structural and dynamical properties of materials. Scattering techniques generally work best when the wavelength of the radiation is about the same as the size of the structures that scatter the radiation. The basic principle underlying light scattering can be grasped by considering the intensity of the light scattered by two particles within the scattering volume. Dynamic light scattering (DLS) takes note of particular fact and uses the time dependence of the flickering speckles to quantitatively characterize the underlying motion of the scatterers. Scattering methods based on imaging geometries have been developed, such as Photon Correlation Imaging and Near Field Scattering. In differential dynamic microscopy (DDM), one takes again advantage of a differential algorithm.
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Recent progress in polymer and filler structure in polymer nanocomposites
Auteur(s): Oberdisse J., Baeza G., Banc A., Genix A.-C.
(Séminaires)
Northwestern Polytechnical University Xi'an (Xi'an, CN), 2016-04-04 |
