Generation of high-peak power, microwave ultra-short pulses (USPs) is desirable for ultra-wideband communications and remote sensing. A variety of microwave USP generators exist today, or are described in the literature, and have benefits and limitations depending on application. A new class of pulse compressors for generating USPs using electromagnetic time reversal (TR) techniques have been developed in the last decade, and are the topic of this dissertation. This dissertation presents a compact TR microwave pulse-compression cavity that has ultra-wide bandwidth (5 GHz – 18 GHz), and employs waveguide feeds for high-peak power output over the entire band. The system uses a time-reversal-based pulse compression scheme with one-bit processing (OBTR) to achieve high compression gain. Results from full-wave simulations are presented as well as measurements showing compression gain exceeding 21.2 dB, 22% efficiency, and measured instantaneous peak output powers reaching 39.2 kW. These are all record results for this type of pulse compressor. Additionally presented is new analysis of variation in compression gain due to impulse response recording time and bandwidth variation, new experimental work on the effect of mode stirrer position on compression gain, and a novel RF switch-based technique for reducing time-sidelobes while using OBTR. Finally, a new technique is presented that uses a reverberant cavity with only one feed connected to an ultra-wideband circulator (6.5 GHz to 17 GHz) to perform TRPC. Prior to this work, TRPC has only been demonstrated in electromagnetics using two or more feeds and a reverberant cavity acting as the time-reversal mirror. This new 1-port technique is demonstrated in both simulation and measurement. The proposed system achieves up to a measured 3 dB increase in compression gain and increased efficiency. Also, a novel application of the random coupling model (RCM) to calculate compression gain is presented. The cavity eigenfrequencies are modeled after eigenvalues of random matrices satisfying the Gaussian orthogonal ensembles (GOE) condition. Cavity transfer functions are generated using Monte Carlo simulations, and used to compute the compression gains for many different cavity realizations. / Doctor of Philosophy / Generation of high-peak power, microwave ultra-short pulses (USPs) is desirable for ultra-wideband communications and remote sensing. A variety of microwave USP generators exist today, or are described in the literature, and have benefits and limitations depending on application. A new class of pulse compressors for generating USPs using electromagnetic time reversal (TR) techniques have been developed in the last decade, and are the topic of this dissertation. This dissertation presents a compact TR-based microwave pulse-compression cavity that has unique features that make it optimal for high-power operations, with results from simulations as well as measurements showing improved performance over other similar cavities published in the literature with a record demonstrated peak output power of 39.2 kW. Additionally, new analysis on the operation and optimization of this cavity for increased performance is also presented. Finally, a new technique is presented that uses a cavity with only one feed that acts as both the input and output. This 1-port technique is demonstrated in both simulation and measurement. The proposed system achieves a two-times increase in compression gain over its 2-port counterpart. In conjunction with these measurements and simulations, a novel technique for predicting the performance of these cavities using Monte Carlo simulation is also presented.

Dans ce mémoire de thèse, nous présentons de nouvelles approches dans le domaine de la détection et de la localisation des défauts non-francs dans les réseaux filaires. Dans le domaine de la détection, l’idée est d’adapter le signal de test au réseau à tester, donc celui-là dépendra de la configuration du système sans devoir être prédéfini, comme c’est le cas des méthodes standard de réflectométrie. Nous prouvons que cette approche MP est plus bénéfique lorsque le système est plus complexe, c’est-à-dire lorsque sa réponse est plus riche en échos, ce qui est contraire aux méthodes existantes. L’étude de la MP est menée à travers une étude mathématique, et les résultats de simulation et d’expérimentation valident l’approche proposée. Dans le domaine de la localisation des défauts, et en se basant sur les propriétés de la DORT, nous développons une méthode distributive non-itérative capable de synthétiser des signaux de test se focalisant directement sur la position du défaut. Une étude statistique nous permet d’analyser quelques-uns des paramètres les plus influents sur la performance de la méthode, puis les résultats de simulation et expérimentaux montrent la capacité de la méthode à synthétiser des signaux se focalisant directement sur la position du défaut non-franc, sans avoir besoin d’algorithmes tératifs. / In this thesis we present new approaches in the domains of soft fault detection and location in complex wire networks, based on the properties of time reversal. When addressing the detection of soft faults, the idea is to adapt the testing signal to the network under test, instead of being predefined for all the tested networks, as opposed to standard reflectometry techniques. We prove that this approach, which we name the Matched Pulse approach (MP), is beneficial whenever the system is more complex, i.e., its response is richer in echoes, which is opposed to common understanding. The MP analysis is conducted via a formal mathematical analysis, followed by simulation and experimental results validating the proposed approach. In the domain of soft fault location, and based on the DORT (Décomposition de l’Opérateur de Retournement Temporel) properties, we derive a distributive non-iterative method able to synthesize signals that focus on the fault position. Through a statistical study we analyze some of the influencing parameters on the performance of the method, and then simulation and experimental results show that the method is able to synthesize signals directly focalizing on the soft fault position, without the need for iterations.

No description available.

Le travail mené dans cette thèse s’inscrit dans la continuité des recherches sur l’élastographie par onde de cisaillement. Après un rappel bibliographique, la présentation d’une étude expérimentale montre que la résolution en élastographie par ultrasons est du même ordre de grandeur que la résolution en échographie et que sa limite dépasse la longueur d’onde de cisaillement. L’originalité de ce travail repose sur l’utilisation d’un réseau de sources mécaniques pour la génération et le contrôle des ondes de cisaillement. Un miroir à retournement temporel de six vibreurs est d’abord mis en place. Ce dispositif montre un contrôle spatio-temporel du champ élastique dans un gel gélatine-graphite. Comparé à l’utilisation d’un seul vibreur, le réseau de sources, proposé dans ce travail, améliore de 10dB le rapport signal sur bruit. L’application de cette méthode sur un modèle du crâne humain montre la possibilité de délivrer et contrôler les ondes de cisaillement dans le cerveau par conduction osseuse. Enfin, l’application de cette méthode à l’élastographie des couches abdominales est présentée par une étude sur un modèle synthétique et in vivo sur un volontaire sain / This thesis is in line with shear-wave elastography research. After, a bibliographic review, an experimental study shows that the resolution on ultrasound elastography is of the same order of magnitude of the echography resolution and its limit exceeds the shear-wavelength. The original aspect of this work is the use of a phased array of mechanical sources to generate and control shear waves. A time reversal mirror of six shakers is set up. This device shows a space-time control of shear-wave field in gelatin-graphite phantom. Compared to the use of a single source, this phased array of shear-wave improves by 10dB the signal to noise ratio. Using this method on human skull model shows the possibility to deliver and control shear waves in brain using bone conduction. Finally, the application of this method on shear-wave elastography of abdominal layers is shown by a study on synthetic model and in vivo on a healthy volunteer

Cet ouvrage présente de nouveaux aspects de l’analogie entre temps et espace pour les ondes, à travers des concepts de contrôle temporel de la propagation des ondes, qui peuvent être interprétés comme la transposition au domaine temporel d’opérations standard du domaine spatial. Toute l’étendue de cette analogie est étudiée dans le cadre deux phénomènes ondulatoires bien connus (dans leurs versions spatiales), et dont nous montrons qu’ils sont étroitement liés : la réflexion des ondes et leur transformation par un cristal. En particulier, il est démontré expérimentalement que l’analogue temporel de la réflexion par un miroir génère une onde retournée temporellement, c’est-à-dire dont l’évolution temporelle est inversée. Une variante monofréquentielle de ce miroir temporel instantané, qui possède des liens étroits avec le concept de conjugaison de phase utilisé pour le retournement temporel d'ondes monochromatiques en optique, est également étudiée. Nous montrons que la modulation temporelle périodique du milieu mise en jeu dans ces expériences constitue l'équivalent temporel d'un cristal pour les ondes et étudions les propriétés générales des ondes dans ces milieux. Nous cherchons naturellement à sonder les limites de ces analogies spatiotemporelles, dont, de toute évidence, le principe de causalité est un élément majeur. Les phénomènes étudiés sont généraux et communs à toutes les ondes classiques, gouvernées en général par l’équation de d’Alembert ou par d’autres équations similaires. Les ondes à la surface d’un liquide sont utilisées comme système ondulatoire modèle dans nos expériences / This work presents new aspects of the analogy between time and space in wave phenomena, through new concepts of time control of wave propagation which can be interpreted as the transposition onto the time domain of standard spatial operations. The depth of this analogy is thoroughly studied in the framework of two well-known wave phenomena: reflection of waves on a mirror and their transformation by a crystal. More precisely, we experimentally demonstrate that the time analog of reflection by a mirror generates a time reverse wave that is whose time evolution is inverted. A monofrequency variant of this instantaneous time mirror, which has strong connections to the concept of wave phase conjugation used for time reversing monochromatic waves in optics, is also studied. We show that the periodic time modulation of the medium involved in the latter experiments constitutes the time equivalent of a crystal for waves and we study the general properties of waves in such media. We address of course the issue of the limits of theses space time analogies, of which, the principle of causality is evidently a major constituent. The phenomena studied here are general and apply to all classical waves (usually governed by d’Alembert’s equation or by similar ones). Waves at the surface of a liquid are used as a model wave system in our experiments / Die Universalitat der klassischen Wellenphanomenen lasst sich weitgehend durch die d’Alembertsche Struktur der Wellengleichungen beschreiben. In letzterer spielen die Zeit- und Raumvariabeln eine ahnliche Rolle. Wir betrachten in diesem Werk diese bekannte Analogie unter einem neuen Licht, indem wir neue Konzepte der Zeitkontrolle von der Wellenpropagation introduzieren, die als Transposition zum Bereich der Zeit von standarden Wellenphanomen des Raumes interpretiert werden konnen, wobei die raumliche Variation der Eigenschaften des Mediums, die sie bestimmen, durch eine zeitliche ersetzt wird. Wir bringen den experimentellen Beweis der Relevanz dieses Ansatzes, wobei wir die Wellen an der Oberflache einer Flussigkeit als Modelwellensystem verwenden und zeigen durch theoretische Erkenntnisse, dass er auf alle Wellensysteme generalisiert werden kann, die durch eine Wellengleichung beschrieben wird, deren 10 Struktur die der d’Alembertschen Gleichung ahnelt. Die ganze Reichweite dieser Analogie wird im Rahmen zweier langst bekannten Wellenphanomenen (in deren raumlichen Version), von denen wir zeigen, dass sie eng verbunden sind : die Spiegelung einer Welle und deren Umwandlung durch einen Kristal. Das Equivalent eines Spiegels fuhrt zur augenblicklichen Erscheinung aus dem gesammten Raum einer zeitumgekehrten Welle, das heist einer Wellenform, derer zeitliche Entwicklung im Vergleich zu der originellen Welle umgekehrt ist. Eine Einzelfrequenzvariante dieses augenblicklichen Zeitspiegels wird auch vorgestellt, die enge Verbindungen mit dem fur die Zeitumkehr monochromatischer Wellen angewendeten Konzept der optischen "Phase Conjugation" (Phasenkonjugierung) besitzt. Wir zeigen, dass die dazugehorige periodische Zeitmodulation des Mediums das zeitliche Equivalent eines Kristals fur die Welle bildet, und wir studieren die generellen Eigenschaften der Wellen in solchen Medien. Wir versuchen, die Grenzen dieser raumzeitlichen Analogien zu erkundigen, in derer Bestimmung selbstverstandlich das Kausalitatsprinzip eine masgebliche Rolle spielt, und die interessanten Unterschiede zwischen den vorgestellten Konzepten und deren raumlichen Pendants offenbaren / La universalidad de los fenomenos ondulatorios clasicos es ampliamente descrita por la estructura de la ecuacion de d’Alembert. En esta ecuacion, las variables espaciales y temporales desempenan un papel similar. En esa obra, revisitamos esta analogia bien conocida a traves de nuevos conceptos de control temporal de la propagacion de las ondas, quienes pueden ser interpretados como transposiciones de fenomenos espaciales estandartes al ambito temporal, en los cuales las variaciones espaciales de las propiedades del medio son reemplazadas por las correspondientes variaciones temporales. Hacemos la prueba, usando ondas a la superficie de un liquido, de la relevancia de este enfoque y mostramos teoreticamente su generalizacion a todo tipo de onda clasica, es decir gobernada por una ecuacion cuya estructura es similar a la de d’Alembert. Toda la extension de esta analogia queda estudiada en el cuadro de los dos fenomenos clasicos (en sus versiones espaciales) que son la reflexion de una onda sobre un espejo y su trasformacion en un cristal. Ademas, mostramos que los dos son intimamente relacionados. El equivalente temporal de un espejo produje instantaneamente desde el medio entero una onda retornada en el tiempo, es decir cuya evolucion temporal es invertida comparado a la onda inicial. Una variante monofrecuencial de este espejo queda estudiada tambien. Posee estrechos vinculos con el concepto de Phase Conjugation (conjugacion de fase), usado en Optica para hacer retornamiento temporal de ondas monocromaticas. Mostramos que la modulacion temporal implicada constituye el equivalente de un cristal para las ondas et estudiamos las caracteristicas generales de ondas en estos medios. Sondeamos los limites de esas analogias espaciotemporales de cuyos obviamente el principio de causalidad es un elemento mayor y que revelan diferencias interesantes entre los conceptos presentados y sus equivalentes espaciales / L’universalita dei fenomeni ondulatori classici e in larga misura descritta dalla struttura dell’equazione di d’Alembert. In quest’equazione, le variabili spaziali e temporali svolgono ruoli analoghi. Nell’opera seguente rivisitiamo questa ben nota analogia introducendo nuovi concetti sul controllo temporale della propagazione delle onde. Questi concetti possono essere interpretati come trasposizione di fenomeni ondulatori spaziali standard nell’ambito temporale, sostituendo le variazioni spaziali delle proprieta del mezzo con le variazioni temporali corrispondenti. Usando delle onde sulla superficie di un liquido come modello fisico, facciamo fede della rilevanza di quell’approccio e mostriamo teoricamente la generalizzazione a tutti i tipi di onde classiche, governate da equazioni simili a quella di d’Alembert. Questa analogia viene studiata nell’ambito di due fenomeni ondulatori ben noti (nella loro versione spaziale) : la riflessione delle onde generata da un specchio e la loro trasformazione generata da un cristallo. Mostriamo inoltre che i due concetti sono intimamente vincolati. L’equivalente temporale di un specchio porta alla generazione in tutto lo spazio di un’onda restituita nel tempo, vale a dire un’onda di cui l’evoluzione temporale e invertita in relazione all’onda originale. In questa tesi viene presentata anche una variante monofrequenziale di questo specchio temporale istantaneo che possiede legami stretti con il concetto di coniugazione di fase usato in ottica per invertire nel tempo onde monocromatiche. Mostriamo in questo lavoro che la modulazione temporale periodica del mezzo in questione costituisce, per le onde, l’equivalente temporale di un cristallo e ne studiamo le proprieta generali. In questa tesi, cerchiamo di sondare i limiti dell’analogia spaziotemporale, di cui il principio di causalita ne e l’essenziale e che rivelano differenze interessanti tra i concetti presentati e i loro equivalenti spaziali

Les travaux effectués durant cette thèse s’inscrivent dans le cadre d’une collaboration entre l’équipe CEM de l’Institut Pascal et l’équipe EDPAN du Laboratoire de Mathématiques de l’Université Blaise Pascal de Clermont-Ferrand. Nous présentons ici une étude qui, partant de l’analyse du processus de Retournement Temporel en électromagnétisme, a débouché sur le développement d’une méthode originale baptisée Linear Combination of Configuration Fields (LCCF) ou, en français, Combinaison Linéaire de Configurations de Champs. Après avoir introduit l’ensemble des outils et méthodes utilisés dans ces travaux, ce mémoire détaille le processus de Retournement Temporel de base ainsi qu’un ajout apporté à celui-ci. Par la suite, la méthode LCCF s’étant révélée applicable à plusieurs problèmes d’identification de sources en électromagnétisme, nous nous consacrons à la présentation détaillée des différentes variantes de celle-ci et nous illustrons son utilisation sur de nombreux exemples numériques. / This Ph.D thesis is the result of a collaboration between the CEM team of Pascal Institute and the EDPAN team of the Laboratory of Mathematics of the Blaise Pascal University in Clermont-Ferrand. We present here a study based on Time Reversal process in Electromagnetics. This work led to the development of a novel method called Linear Combination of Configuration Field (LCCF). This thesis first introduces the tools and the numerical methods used during this work. Then, we describe the Time Reversal process and a possible improvement to the basic technic. Afterwards, several possible applications of the LCCF method to electromagnetic source identification problems are detailed and we illustrate each of it on various numerical examples.

An investigation is presented of the behavior of time-reversal focusing in soils. Initial numerical models demonstrate time-reversal focusing to be effective in elastic media, including when a large number of scattering objects were present in the medium. When scattering objects are present, time-reversal focusing demonstrates superior focusing ability when compared to other excitation methods such as uniform excitation or time-delay focusing. Multiple experimental investigations of experimental time-reversal focusing performed in sand evaluate time-reversal focusing effectiveness when multiple near-surface scattering objects are present in the medium. Experimental results demonstrate that time-reversal focusing is effective in the experimental context as well as the numerical models. Further experiments examine time-reversal focusing in more extreme cases where the entire ballistic wave is blocked, and the only energy reaching the focus point is reflected from scattering objects in the medium. A comparison to other focusing methods demonstrates that under these conditions, most focusing attempts with traditional methods will fail completely while time-reversal focusing does not. Additional configurations of time-reversal focusing examine its effectiveness when scattering is caused by an asymmetrical surface layers. The impact of an asymmetrical or non-uniform excitation array is also examined for time-reversal focusing in the presence of scattering objects. An investigation of the effects of scattering object geometry on focusing resolution in time-reversal focusing is also presented. Scattering object field density is found to have a strong, but diminishing effect on focusing resolution as the scattering object field density increased. Loss of surface wave energy available for focusing due to mode-conversion is found to be correlated with the density of the scattering object field. The impact of the weak non-linear nature of the soil on time-reversal focusing is examined through a study of time-reversal focusing behavior for a variety of amplitudes that generate different levels of non-linearity in the soil. This study of nonlinearity is coupled with a study of the impact of noise on time-reversal focusing. It appears that both non-linearity and noise have an impact on time-reversal focusing effectiveness. Further, the loss from these mechanisms seems to be interrelated. Noise seems to enhance non-linear loss in the soil.

Through-the-wall Imaging (TWI) is crucial for various applications such as law enforcement, rescue missions and defense. TWI methods aim to provide detailed information of spaces that cannot be seen directly. Current state-of-the-art TWI systems utilise ultra-wideband (UWB) signals to simultaneously achieve wall penetration and high resolution. These TWI systems transmit signals and mathematically back-project the reflected signals received to image the scenario of interest. However, these systems are diffraction-limited and encounter problems due to multipath signals in the presence of multiple scatterers. Time reversal (TR) methods have become popular for remote sensing because they can take advantage of multipath signals to achieve superresolution (resolution that beats the diffraction limit). The Decomposition Of the Time-Reversal Operator (DORT in its French acronym) and MUltiple SIgnal Classification (MUSIC) methods are both TR techniques which involve taking the Singular Value Decomposition (SVD) of the Multistatic Data Matrix (MDM) which contains the signals received from the target(s) to be located. The DORT and MUSIC imaging methods have generated a lot of interests due to their robustness and ability to locate multiple targets. However these TR-based methods encounter problems when the targets are behind an obstruction, particularly when the properties of the obstruction is unknown as is often the case in TWI applications. This dissertation introduces a novel total sub-MDM algorithm that uses the highly acclaimed MUSIC method to image targets hidden behind an obstruction and achieve superresolution. The algorithm utilises spatio-temporal windows to divide the full-MDM into sub-MDMs. The summation of all images obtained from each sub-MDM give a clearer image of a scenario than we can obtain using the full-MDM. Furthermore, we propose a total sub-differential MDM algorithm that uses the MUSIC method to obtain images of moving targets that are hiddenbehind an obstructing material.

abstract: In the traditional setting of quantum mechanics, the Hamiltonian operator does not depend on time. While some Schrödinger equations with time-dependent Hamiltonians have been solved, explicitly solvable cases are typically scarce. This thesis is a collection of papers in which this first author along with Suslov, Suazo, and Lopez, has worked on solving a series of Schrödinger equations with a time-dependent quadratic Hamiltonian that has applications in problems of quantum electrodynamics, lasers, quantum devices such as quantum dots, and external varying fields. In particular the author discusses a new completely integrable case of the time-dependent Schrödinger equation in R^n with variable coefficients for a modified oscillator, which is dual with respect to the time inversion to a model of the quantum oscillator considered by Meiler, Cordero-Soto, and Suslov. A second pair of dual Hamiltonians is found in the momentum representation. Our examples show that in mathematical physics and quantum mechanics a change in the direction of time may require a total change of the system dynamics in order to return the system back to its original quantum state. The author also considers several models of the damped oscillators in nonrelativistic quantum mechanics in a framework of a general approach to the dynamics of the time-dependent Schrödinger equation with variable quadratic Hamiltonians. The Green functions are explicitly found in terms of elementary functions and the corresponding gauge transformations are discussed. The factorization technique is applied to the case of a shifted harmonic oscillator. The time-evolution of the expectation values of the energy related operators is determined for two models of the quantum damped oscillators under consideration. The classical equations of motion for the damped oscillations are derived for the corresponding expectation values of the position operator. Finally, the author constructs integrals of motion for several models of the quantum damped oscillators in a framework of a general approach to the time-dependent Schrödinger equation with variable quadratic Hamiltonians. An extension of the Lewis-Riesenfeld dynamical invariant is given. The time-evolution of the expectation values of the energy related positive operators is determined for the oscillators under consideration. A proof of uniqueness of the corresponding Cauchy initial value problem is discussed as an application. / Dissertation/Thesis / Ph.D. Applied Mathematics for the Life and Social Sciences 2011

Dans un grand nombre d'applications industrielles, il est nécessaire d'inspecter des structures rayonnantes à l'aide de techniques de caractérisation et de localisation de sources acoustiques instationnaires. Ces dernières décennies, plusieurs techniques d'imagerie acoustique ont été développées, reposant sur l'utilisation de mesures d'un jeu de grandeurs acoustiques (pression et/ou vitesse particulaire) sur des antennes microphoniques, structurées ou non. Le travail réalisé durant cette thèse porte plus spécifiquement sur les techniques d'imagerie instationnaires par retournement temporel. Nous nous intéressons plus particulièrement aux optimisations permettant de rendre les performances de ces techniques d'imagerie instationnaires insensibles aux conditions de mesures (environnement réverbérant et bruité). Pour cela, différentes améliorations sont proposées dans ce manuscrit, grâce à des mesures réalisées sur une antenne hémisphérique double-couche. En particulier, nous détaillerons un processus d'imagerie acoustique quantitative par retournement temporel grâce au calcul de l'intégrale de Helmholtz-Kirchhoff retournée temporellement, grâce aux mesures "double données" réalisées sur l'antenne. Ensuite, nous détaillerons les optimisations pour supprimer les effets de salle et les contributions de sources perturbatrices grâce à une méthode de séparation de champs, qui consiste à projeter les données mesurées sur la base des harmoniques sphériques puis à séparer les contributions "entrantes" et "sortantes". Pour finir, la résolution d'imagerie par retournement temporel, intrinsèquement limitée, est améliorée grâce à la définition automatique d'un puits à retournement temporel dont la formulation analytique tire partie de la structure double-couche des données mesurées. Il est essentiel de noter que ces différentes stratégies d'optimisation sont possibles grâce à l'enregistrement d'un double jeu de données (pression-pression ou pression-vitesse). La qualité de reconstruction du champ de pression par le processus d'imagerie par retournement temporel double couche complet est illustré à travers des études numériques et des études expérimentales, allant d'une configuration idéale (environnement anéchoïque et non bruité) à un cas complexe (environnement fortement réverbérant et bruité). / For many industrial applications, it is necessary to inspect radiating structures using non-stationary sources localization and characterization techniques. In the last decades, many acoustical imaging methods have been developed. These techniques are based on the measurement of a set of acoustical quantities (pressure and/or particle velocity) on structured (or not) microphones antennas. In particular, this thesis work aims at studying and optimizing non-stationary imaging methods using time reversal. More particularly, we are interested in improvements following to assess precisely the acoustic field with good performances, by making these methods performances insensitive to the measurements conditions (reverberant and noisy environment). For purpose, several improvements are proposed in this manuscript, thanks to measurements realised on a hemispherical double layer antenna. In particular, we detail a quantitative time reversal acoustical imaging process thanks to the calculation of the time reversed version of the Helmholtz-Kirchhoff integral, using the "double data" measurements realised on the antenna. Then, we will detail improvements to suppress both room effects and the perturbative sources contributions thanks to a field separation method, which consists in expanding the measured data onto spherical harmonics functions basis. Then, the "incoming" and the "outgoing" contributions are separated. Finally, the time reversal imaging resolution, intrinsically limited, is improved thanks to the automatic definition of a time reversal sink. Its analytical formulation takes advantage of double layer measurement structure. This of crucial importance to note that all these improvements take advantage from the recording of a double data set (pressure-pressure or pressure-velocity). The quality of the pressure field reconstructed using the full double layer time reversal imaging process is illustrated through numerical and experimental studies, from an idealized situation (anechoic and not noisy environments) to a hard case (highly reverberant and noisy environment).