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Artykuły w czasopismach na temat "Imagerie passive – Innovation"
Broquet, Grégoire, François-Marie Bréon, Emmanuel Renault, Michael Buchwitz, Maximilian Reuter, Heinrich Bovensmann, Frédéric Chevallier, Lin Wu i Philippe Ciais. "The potential of satellite spectro-imagery for monitoring CO<sub>2</sub> emissions from large cities". Atmospheric Measurement Techniques 11, nr 2 (7.02.2018): 681–708. http://dx.doi.org/10.5194/amt-11-681-2018.
Pełny tekst źródłaLove, Mckenzie, Aiswarya Vellappally, Pierre Roy, Kate Smith, Gavin McPherson i David Gold. "Automated detection of wildlife in proximity to marine renewable energy infrastructure using machine learning of underwater imagery". Proceedings of the European Wave and Tidal Energy Conference 15 (2.09.2023). http://dx.doi.org/10.36688/ewtec-2023-623.
Pełny tekst źródłaRozprawy doktorskie na temat "Imagerie passive – Innovation"
Sivadon, Audrey. "Contributions à l’imagerie passive de la cavitation ultrasonore : formation de voies adaptatives en 3D et extension spatiale de nuages de bulles". Electronic Thesis or Diss., Lyon 1, 2022. http://www.theses.fr/2022LYO10172.
Pełny tekst źródłaPassive imaging relies on beamforming algorithms that require large aperture probes to provide good axial resolutions; however, in 3D passive imaging, the matrix probes currently marketed do not meet this constraint. Moreover, these probes have a large number of elements, which makes their use particularly unwieldy. This thesis work focuses on the study and improvement of passive cavitation imaging by addressing two aspects in particular: (i) the practical and efficient implementation of 3D passive imaging, (ii) the problem of imaging large sources such as cavitation clouds. We have combined the application of sparse methods (to reduce the number of active elements of the probe used) and the transposition from 2D to 3D of adaptive algorithms in the frequency domain. This formalism uses the robust estimation of the inter-spectral density matrix (CSM) and allowed us to implement simply and efficiently different algorithms: Delay-And-Sum (DAS), Robust-Capon-Beamformer and Pisarenko. The efficiency of these algorithms in 3D has been tested in terms of width to half height, contrast and position error, on a point source in simulations and on a point reflector in experiments. Finally, in order to address the reality of cavitation clouds, we have investigated the behavior of these reconstruction methods in the case of extended sources. Our 2D simulations show the evolution of the reconstructed images as a function of the cavitation cloud characteristics. This work provides a concrete solution for a simple implementation of 3D passive imaging as well as answers to the expectations on the localization and characterization of a cavitation cloud
Laloy-Borgna, Gabrielle. "Micro-élastographie : caractérisation mécanique de la cellule par ondes élastiques". Electronic Thesis or Diss., Lyon 1, 2023. http://www.theses.fr/2023LYO10058.
Pełny tekst źródłaDyanmic elastography is an imaging method to measure the elasticity of biological tissues in a non-invasive and quantitative way. Recently, the transposition of the technique to a small scale has been called dynamic micro-elastography and has allowed the first measurements of cellular elasticity by shear waves using an optical microscope. This thesis aims to undetstand the limits of this technique and to develop new micro-elastography methods, to test new wave sources but also potential applications of the technique. In a first step, the dispersion of shear waves was studied on gelatin phantoms. Two distinct regimes of guided elastic waves and shear waves were identified. The high-frequency limit of wave propagation was also explored, establishing the existence of a cutoff frequency which explains the absence of ultrasonic shear imaging. The same approach was then applied to visco-elastic fluids, revealing two cutoff frequencies and revisiting previous studies on rheology and wave propagation in this type of medium. Then, the initial objective being to carry out micro-elastography on single cells and the experiments previously carried out with micro-pipettes presenting certain defects, an original method of cellular micro-elastography was developed. An oscillating microbubble is used as a contactless shear wave source at 15 kHz to perform experiments on blood cells whose diameter is about 15 µm. These are the smallest objects ever explored by elastography. Larger objects, cell clusters of a few tens of thousands of cells have also been studied. Indeed, since ultrasound elastography of these tumour models of about 800 µm in diameter is impossible, optical micro-elastography is a suitable technique. These samples contain magnetic nanoparticles, so a magnetic pulse could be used as a wave source. Previously, proofs of concept on both macroscopic (in ultrasonic elastography) and microscopic (in optical micro-elastography) phantoms were conducted to validate the use of this diffuse field source. Finally, pulse wave measurements were performed on retinal arteries of about 50 µm in diameter using laser Doppler holography acquisitions performed in vivo. The application of monochromatic correlation algorithms allowed the measurement of guided wave velocities, finally revealing the existence of a second pulse wave, an antisymmetric bending wave. This guided wave, much slower than the axisymmetric pulse wave studied so far, was also observed on the carotid artery thanks to ultrafast ultrasound acquisitions
Streszczenia konferencji na temat "Imagerie passive – Innovation"
Callejero, Carlos, i Inigo Ederra. "Design of an antenna array for a passive mm-wave imager". W International Workshop on Antenna Technology: "Small Antennas, Innovative Structures and Materials" (iWAT 2010). IEEE, 2010. http://dx.doi.org/10.1109/iwat.2010.5464796.
Pełny tekst źródłaDoolittle, Daniel, Ross Eaton, Marna Parslow, Paul Donlan i Craig Jones. "Data Fusion and Visualization Approaches to Achieving a Common Operating Picture During Offshore Wind Construction and Operation Works". W Offshore Technology Conference. OTC, 2024. http://dx.doi.org/10.4043/35461-ms.
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