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Littérature scientifique sur le sujet « Underwater and ultrasonic »

Auteur : Grafiati

Publié le 1 février 2025

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Articles de revues sur le sujet "Underwater and ultrasonic"

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Wu, Zheng Long, Jie Li et Zhen Yu Guan. « Feature Extraction of Underwater Target Ultrasonic Echo Based on Wavelet Transform ». Applied Mechanics and Materials 599-601 (août 2014) : 1517–22. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.1517.

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Ultrasonic detection has been widely used in underwater detectoscopes as an important method for underwater detection. Feature extraction of echo signal time-delay and amplitude is the main task of processing underwater ultrasonic signal. Underwater target ultrasonic echo signal is influenced by reverberation and noise from the sea and system itself, reverberation interference of signal background is the main difficulty for target echo detection. So we use denoising algorithm to denoise echo signal. At first this paper denoises the measured weighted background clutter data using wavelet threshold denoising method, then the paper extracts breaking points of echo signal through wavelet transform, at last the paper makes an envelope extraction using Hilbert transform combined with wavelet transform methods, and acquires the feature information of echo signal amplitude.

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Sonomatic Ltd. « Underwater ultrasonic corrosion mapping system ». NDT International 23, n^o 1 (février 1990) : 58–59. http://dx.doi.org/10.1016/0308-9126(90)91593-i.

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Sonomatic Ltd. « Underwater ultrasonic corrosion mapping system ». NDT & ; E International 23, n^o 1 (février 1990) : 58–59. http://dx.doi.org/10.1016/0963-8695(90)90857-f.

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Nagashima, Yutaka, Takakazu Ishimatsu et Jamal Tariq Mian. « AUV with Variable Vector Propeller ». Journal of Robotics and Mechatronics 12, n^o 1 (20 février 2000) : 60–65. http://dx.doi.org/10.20965/jrm.2000.p0060.

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We developed an autonomous underwater vehicle (AUV) with a distributed controller and underwater acoustic communication. It is compact and lightweight thanks to its variable vector propeller and control using sophisticated logic circuits. Control is very precise using underwater ultrasonic command signals. Experiments showed that the AUV moves along a path at the desired position and azimuth. We confirmed the feasibility of our algorithm for increasing ultrasonic communication reliability.

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Widjaja, Raden Sjarief, Dedi Budi Purwanto, Andi Trimulyono et Muhammad Nur Abdullah Hafizh. « Design of Remotely Operated Underwater Vehicle (ROUV) for Underwater Metal Detection ». Kapal : Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 21, n^o 2 (29 mai 2024) : 73–80. http://dx.doi.org/10.14710/kapal.v21i2.62767.

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The underwater surveys and inspections in Indonesia were carried out mostly by the operation of practical divers who were limited to shallow waters. The deep - sea exploration requires more advanced technology. The development of underwater technology is required to support many functions of underwater surveys and inspections. The purpose of this study was to design a Remotely Operated Underwater Vehicle (ROUV) for detecting objects with metallic materials. The ROV was designed with a Penta Tubular model and camera assistance for navigation, the JSNSR04T ultrasonic sensor to detect object distances, and the LJ12A3 inductive proximity sensor as a metal detector. ROUV rides are controlled using a keyboard with certain keywords and monitored using a smartphone. Testing the JSN-SR04T Ultrasonic sensor uses 5 variations of distance, namely 20cm, 40cm, 60cm, 80cm, and 100cm, with the detection object in the form of a plate with dimensions of 35cm x 35cm. For testing the inductive proximity sensor, the LJ12A3 type uses 3 variations of materials, namely steel plate, aluminum plates as metal objects, and PVC plates as control materials. Tests were carried out in two mediums, namely in air and underwater. Based on the results of data retrieval testing of the ultrasonic distance sensor in the air, the smallest error percentage is 0.06%, and the highest error percentage is 0.705%. In the underwater test, the error percentage was 0.49% for a distance variation of 100 cm. The ultrasonic distance sensor type JSN-SR04 cannot read distance data below 89.75 cm in water due to differences in the speed of sound propagation in different media. The Inductive Proximity Sensor can work well in air and water mediums with 100% accuracy on steel plates, aluminum plates, and PVC plates.

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Hong, Xiaobin, Liuwei Huang, Shifeng Gong et Guoquan Xiao. « Shedding Damage Detection of Metal Underwater Pipeline External Anticorrosive Coating by Ultrasonic Imaging Based on HOG + SVM ». Journal of Marine Science and Engineering 9, n^o 4 (29 mars 2021) : 364. http://dx.doi.org/10.3390/jmse9040364.

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Underwater pipelines are the channels for oil transportation in the sea. In the course of pipeline operation, leakage accidents occur from time to time for natural and man-made reasons which result in economic losses and environmental pollution. To avoid economic losses and environmental pollution, damage detection of underwater pipelines must be carried out. In this paper, based on the histogram of oriented gradient (HOG) and support vector machine (SVM), a non-contact ultrasonic imaging method is proposed to detect the shedding damage of the metal underwater pipeline external anti-corrosion layer. Firstly, the principle of acoustic scattering characteristics for detecting the metal underwater pipelines is introduced. Following this, a HOG+SVM image-extracting algorithm is used to extract the pipeline area from the underwater ultrasonic image. According to the difference of mean gray value in the horizontal direction of the pipeline project area, the shedding damage parts are identified. Subsequently, taking the metal underwater pipelines with three layers of polyethylene outer anti-corrosive coatings as the detection object, an Autonomous Surface Vehicle (ASV) for underwater pipelines defect detection is developed to verify the detection effect of the method. Finally, the underwater ultrasonic image which used to detect the metal underwater pipeline shedding damage is obtained by acoustic sensor. The results show that the shedding damage can be detected by the proposed method. With the increase of shedding damage width, the effect of pipeline defect location detection is better.

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Zhu, Jie, Jia Cheng Guo, Wei Wang et Jia You Wang. « Effect of Arc Current Ultrasonic-Frequency Pulsation on Underwater Wet Arc Welding Quality ». Advanced Materials Research 763 (septembre 2013) : 174–78. http://dx.doi.org/10.4028/www.scientific.net/amr.763.174.

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A novel process of ultrasonic-assisted underwater wet arc welding was proposed to improve the joint properties, a number of ultrasonic-assisted underwater welding experiments were then carried out, and the effects of pulse frequency on weld formation, joint hardness and microstructure were investigated. Experimental results show that the ultrasonic frequency pulsation of arc can improve weld penetration while reducing effectively the hardness of joint HAZ in the arc axial direction and refining the grain of microstructure, and the effects of which are related closely to the pulse frequency.

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Nagashima, Yutaka, Nobuyoshi Taguchi, Takakazu Ishimatsu et Hirofumi Inoue. « Development of a Compact Autonomous Underwater vehicle Using Varivec Propeller ». Journal of Robotics and Mechatronics 14, n^o 2 (20 avril 2002) : 112–17. http://dx.doi.org/10.20965/jrm.2002.p0112.

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This paper describes an autonomous underwater vehicle (AUV) with a distributed fuzzy controller and underwater acoustic communication. Our AUV is made compact and lightweight by using a Varivec propeller and compact controller with sophisticated logic circuits. The AUV is precisely controlled using underwater ultrasonic command signals and fuzzy control. The AUV is autonomously controlled using an electronic compass, collision avoidance sonar, depth sensor, and GPS receiver. Experimental results show that our AUV moved along the target path and held the desired position keeping azimuth direction and depth. We also confirmed that our algorithm to increase the reliability of ultrasonic communication worked without fail.

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SHIRAI, Kazuhiro. « Development of Underwater Ultrasonic Positioning System ». Journal of the Marine Acoustics Society of Japan 31, n^o 4 (2004) : 233–40. http://dx.doi.org/10.3135/jmasj.31.233.

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Inoue, Takeshi, et Takatoshi Nada. « Underwater low‐frequency ultrasonic wave transmitter ». Journal of the Acoustical Society of America 83, n^o 6 (juin 1988) : 2470. http://dx.doi.org/10.1121/1.396290.

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Thèses sur le sujet "Underwater and ultrasonic"

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Wylie, Stephen Robert. « An underwater ultrasonic imaging system ». Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266220.

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Salido, Monzú David, et Sánchez Oliver Roldán. « Robot Positioning System : Underwater Ultrasonic Measurement ». Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-5817.

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This document provides a description about how the problem of the detection of thecenter of a defined geometry object was solved.This named object has been placed in an experimental environment surrounded bywater to be explored using microwaves under the water, to try to find a possibletumor. The receiver antenna is fixed in the tip of the tool of an ABB robot.Due to this working method, it was necessary to locate the center of this object tomake correctly the microwave scanning turning always around the actual center. Thiswork not only consist in give a hypothetic solution to the people who gave us theresponsibility of solve their problem, it is also to actually develop a system whichcarries out the function explained before.For the task of measuring the distance between the tip of the tool where themicrowave antenna is, ultrasonic sensors has been used, as a complement of acomplete system of communication between the sensor and finally the robot handler,using Matlab as the main controller of the whole system.One of these sensors will work out of water, measuring the zone of the object which isout of the water. In the other hand, as the researching side of the thesis, a completeultrasonic sensor will be developed to work under water, and the results obtained willbe shown as the conclusion of our investigation.The document provides a description about how the hardware and software necessaryto implement the system mentioned and some equipment more which were essentialto the final implementation was developed step by step.

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Koosha, Abdolrahim. « Ultrasonic transducers for air and underwater communication ». Thesis, Kingston University, 1991. http://eprints.kingston.ac.uk/20553/.

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The performance of a novel radiator capable of producing ultrasonic waves in air and liquids has been investigated. For commercial transducers when operating in air or liquids, impedance matching is the necessary condition for maximum transfer of energy to the medium (thus no standing waves are involved). 'However, "for this radiator the formation of the mechanical standing waves on it is the key condition for directional radiation of energy into the surrounding environment. Under this condition the radiator exhibits a practical conversion of electrical energy into ultrasound. To further improve the performance of the radiator . the wavelength coincidence condition must be satisfied. This condition implies that the wavelength of the bending vibration developed on the blade to be the same as that in the medium to which it is coupled. Consequently, an end-fire radiation pattern is obtained. The theory of this when applied to water and also for a double blade configuration are presented. The main component of the radiator consists .of a cantilever blade on which a pair of piezoelectric (PZT) ceramic bars are fixed. These the so called excitation gauges, are fixed on both sides of a thin rectangular metal blade near the clamped end. When wavelength coincidence condition is fulfilled, the radiator transmits ultrasonic wave in a highly directional pattern. The direction of propagation of ultrasound is solely steered by frequency of the applied signal. System imperfections such as inter modal coupling when used underwater are considered. An analytical approach is developed to investigate the performance of the radiator for transmission of digital signals in air as well as in water. This method is used to evaluate the efficiency of the device as a suitable means for communication between divers or a diver and an underwater stationary station. Amplitude modulation of speech signals demonstrated the capabilities of a new underwater transmission. system whose narrow beam width is the condition to obtain power gain and performance. The possibility of the same system to be used as a passive sonar is also examined. Finally, simulations of the above system to be implemented in beam-forming in air and in water have been developed.

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Johansson, Patrick. « Capacitive Micromachined Ultrasonic Transducers for Underwater Applications ». Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447067.

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Capacitive micromachined ultrasonic transducers (CMUT:s) are often used in medical imaging and they show some promise as underwater transducers. This thesis collates the available information about how CMUT:s operate, their strengths and weaknesses and investigates their efficiency as an underwater transducer. The accumulated knowledge was channelled into a simulation of a CMUT as a dampened spring system done in MATLAB and Simulink. The simulation investigated the resonance frequency and bandwidth through simulation and compared the results to experimental results from literature. CMUT:s have good acoustic matching with water making them sensitive, broadband transducers when used under water. Special care must be taken when choosing the CMUT so that materials and designs can fulfil the task for which it is intended, such as the radius of the membrane, the material of the membrane, the insulating layers in or around the CMUT and the height of the air gap inside. CMUT:s are, for the transmission of sound, less capable than existing lead zirconate-titanate-transducers (PZT-transducers). This problem can be somewhat alleviated through operating the CMUT in collapse-mode but care must be taken so that the CMUT is not damaged during this operation. Simulation results and results from literature show that it is possible to simulate CMUT:s with accuracy. By simulating 10 different CMUT:s, using the geometries and material properties of experimentally tested devices and testing for resonance frequency and bandwidth the results were as follows:The average relative error of resonance frequency was found to be -14 %, if outlier results are excluded and the average relative error of bandwidth proved inaccurate at -54 %

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Moya, Jorge A. Salcedo. « Ultrasonic inspection of underwater piping system with thick coatings ». Connect to resource, 1994. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1260632892.

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Floyd, Charles Alan. « Design and implementation of a collision avoidance system for the NPS Autonomous Underwater Vehicle (AUV II) utilizing ultrasonic sensors ». Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28100.

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Anderson, Shaun David. « Space-time-frequency processing from the analysis of bistatic scattering for simple underwater targets ». Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45771.

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The development of low-frequency SONAR systems, using a network of autonomous systems in unmanned vehicles, provides a practical means for bistatic measurements (i.e. when the source and receiver are widely separated, thus allowing multiple viewpoints of a target). Furthermore, time-frequency analysis, in particular Wigner-Ville analysis, takes advantage of the evolution of the time dependent echo spectrum to differentiate a man-made target (e.g. an elastic spherical shell, or cylinder) from a natural one of the similar shape (e.g. a rock). Indeed, key energetic features of man-made objects can aid in identification and classification in the presence of clutter and noise. For example, in a fluid-loaded thin spherical shell, an energetic feature is the mid-frequency enhancement echoes (MFE) that result from antisymmetric Lamb waves propagating around the circumference of the shell, which have been shown to be an acoustic feature useful in this pursuit. This research investigates the enhancement and benefits of bistatic measurements using the Wigner-Ville analysis along with acoustic imaging methods. Additionally, the advantage of joint space-time-frequency coherent processing is investigated for optimal array processing to enhance the detection of non-stationary signals across an array. The proposed methodology is tested using both numerical simulations and experimental data for spherical shells and solid cylinders. This research was conducted as part of the Shallow Water Autonomous Mine Sensing Initiative (SWAMSI) sponsored by ONR.

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Real, Gaultier. « An ultrasonic testbench for reproducing the degradation of sonar performance in fluctuating ocean ». Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4753/document.

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Le milieu océanique est sujet à de nombreuses sources de fluctuations. Les plus importantes sont les ondes internes, très fréquentes et entrainant des fluctuations de la distribution spatiale du champ de célérité du son. En raison de la longue période de ces phénomènes comparée au temps de propagation des ondes acoustiques pour des applications sonar, le processus peut être considéré figé dans le temps pour chaque réalisation stochastique du milieu. Le développement de bancs d’essais permettant de reproduire les effets de la turbulence atmosphérique a permis des avancées considérables dans le domaine de l’optique adaptative. Nous voyons donc un fort intérêt dans la possibilité de reproduire les effets des ondes internes sur la propagation du son en environnement contrôlé. Un protocole expérimental dans une cuve d’eau est proposé: une onde ultrasonore est transmise à travers une lentille acoustique aléatoirement rugueuse, ce qui produit des distorsions du front d’onde reçu. Les fluctuations des signaux reçus sont contrôlées en modifiant les paramètres statistiques de rugosité de la lentille. Ces paramètres sont reliés à l’analyse dimensionnelle permettant de classifier les configurations étudiées selon des régimes de fluctuations et de prédire les moments statistiques du champ acoustique jusqu’à l’ordre quatre. Une excellente correspondance est observée entre notre protocole expérimental et des résultats théoriques et numériques.La dégradation des performances des techniques de détection classiques appliquées à nos données expérimentales souligne le besoin de techniques correctives. Un état de l’art des techniques existantes dans divers domaines est proposé
The ocean medium is subject to many sources of fluctuations. The most critical ones were found to be internal waves, occurring frequently and inducing fluctuations of the spatial distribution of the sound speed field. Because of the fairly long period of this phenomenon as compared to the propagation time of acoustic waves for sonar applications, the process can be considered frozen in time for each stochastic realization of the medium. The development of testbenches allowing to reproduce the effect of atmospheric turbulence on optic waves propagation under laboratory conditions lead to considerable advancements in the field of adaptive optics. We therefore see a vivid interest in being able to reproduce the effects of internal waves on sound propagation in controlled environments. An experimental protocol in a water tank is proposed: an ultrasonic wave is transmitted through a randomly rough acoustic lens, producing distortions of the received wavefront. The induced signal fluctuations are controlled by tuning the statistical parameters of the roughness of the lens. Especially, they are linked to dimensional parameters allowing to classify the configurations into regimes of fluctuations and to predict the statistical moment of the acoustic pressure up to the fourth order. A remarkable relevance of our experimental scheme is found when compared to theoretical and simulation results. The degradation of classical signal processing techniques when applied to our acquired data highlights the need for corrective detection techniques. A review of the existing techniques in other domains is proposed

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Kourchi, Hasna. « Μétaréseaux pοur la réflexiοn et la transmissiοn anοrmales de frοnts d’οnde acοustique dans l’eau ». Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH36.

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Un métaréseau est un assemblage périodique de diffuseurs conçu pour réfléchir ou réfracter une onde vers une direction anormale, non prévue par les lois de Snell-Descartes. Dans ce travail, nous avons conçu, fabriqué et caractérisé expérimentalement de tels métaréseaux pour le contrôle des ondes ultrasonores dans l’eau, en utilisant des tubes et des cylindres en laiton ainsi que des supports plastiques imprimés en 3D. Ces métaréseaux permettent de rediriger un front d'onde incident vers une direction arbitraire souhaitée, avec une efficacité élevée (proche de 100 %), aussi bien en réflexion sur une surface (comme l’interface eau/air) qu'en transmission. L’approche théorique repose sur les principes de la diffraction de Bragg et sur les interactions constructives et destructives des ondes. Les résultats de cette thèse démontrent l'efficacité des métaréseaux à induire des phénomènes acoustiques tels que la rétro-réflexion et la réponse asymétrique, grâce à l’utilisation de structures résonantes et non résonantes, validées par des simulations par éléments finis et des expérimentations. Cette recherche ouvre de nouvelles perspectives pour la manipulation des ondes acoustiques sous-marines, avec des applications potentielles dans les domaines de la détection, de l'absorption et de la réflexion des ondes en milieu marin
A metagrating is a periodic assembly of scatterers designed to reflect or refract a wave toward an anomalous direction, not predicted by Snell's law. In this work, we designed, fabricated, and experimentally characterized such metagratings for the control of ultrasonic waves in water, using brass tubes and cylinders as well as 3D-printed plastic supports. These metagratings enable the redirection of an incident wavefront to an arbitrarily desired direction with high efficiency (close to 100%), both in reflection on a surface (e.g., the water/air interface) and in transmission. The theoretical approach is based on the principles of Bragg diffraction and constructive and destructive wave interactions. The results of this thesis demonstrate the efficiency of metagratings in inducing acoustic phenomena such as retroreflection and asymmetric wave response, achieved through the use of resonant and non-resonant structures, validated by finite element simulations and experiments. This research opens new perspectives for the manipulation of underwater acoustic waves, with potential applications in the fields of wave detection, absorption, and reflection in marine environments

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Pierce, Robert S. « Signal enhancement of laser generated ultrasound for non-destructive testing ». Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/18395.

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Livres sur le sujet "Underwater and ultrasonic"

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Kucharski, William M. Underwater inspection of coastal structures using commercially available sonars. [Vicksburg, Miss : U.S. Army Engineer Waterways Experiment Station, 1990.

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Kucharski, William M. Underwater inspection of coastal structures using commercially available sonars. [Vicksburg, Miss : U.S. Army Engineer Waterways Experiment Station, 1990.

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Floyd, Charles Alan. Design and implementation of a collision avoidance system for the NPS Autonomous Underwater Vehicle (AUV II) utilizing ultrasonic sensors. Monterey, Calif : Naval Postgraduate School, 1991.

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Stroud, John Steven. Twinkling of underwater sound reflected by one realization from a Gaussian spectrum population of corrugated surfaces : Experiments and comparisons with a catastrophe theory approximation. 1995.

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Urick, Robert J. Principles of underwater sound. 3^e éd. Peninsula, 1996.

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Chapitres de livres sur le sujet "Underwater and ultrasonic"

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Ye, Jianxiong, Zhigang Li, Xingling Peng, Jinlan Zhou et Bo Guo. « Study of Ultrasonic Phased Array in Underwater Welding ». Dans Transactions on Intelligent Welding Manufacturing, 175–82. Singapore : Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7043-3_13.

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Talmant, Maryline, et Gérard Quentin. « Study of the Pseudo — Lamb Wave So Generated in Thin Cylindrical Shells Insonified by Short Ultrasonic Pulses in Water ». Dans Progress in Underwater Acoustics, 137–44. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1871-2_17.

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Voloshchenko, Vadim Yu, et Elizaveta V. Voloshchenko. « The Underwater Ultrasonic Equipment with the Nonlinear Acoustics Effect's Application ». Dans Exploration and Monitoring of the Continental Shelf Underwater Environment, 211–33. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119488309.ch7.

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Crowther, P. A., et A. Hansla. « The Lifetimes, Velocities and Probable Origin of Sonic and Ultrasonic Noise Sources on the Sea Surface ». Dans Natural Physical Sources of Underwater Sound, 379–92. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_30.

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Azcuaga, Valery F. Godínez, Jorge Salcedo et Laszlo Adler. « Ultrasonic Inspection of an Underwater Piping System Covered with Thick Coating ». Dans Review of Progress in Quantitative Nondestructive Evaluation, 1867–74. Boston, MA : Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_244.

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Chaitanya, G. M. S. K., Govind Kumar Sharma, Anish Kumar et B. Purnachandra Rao. « Development of Automated Scanners for Underwater and Under-Sodium Ultrasonic Imaging ». Dans Communications in Computer and Information Science, 109–17. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2845-8_9.

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Van Vinh, Phan, Nguyen Hoang Thoan, Nguyen Xuan Duong et Dang Duc Dung. « Fabrication of Underwater Ultrasonic Transducer by Using Lead-Free Piezoelectric Materials ». Dans Lecture Notes in Mechanical Engineering, 683–88. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99666-6_99.

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Van Buren, A. L., et J. E. Blue. « Calibration of Underwater Acoustic Transducers at NRL/USRD ». Dans Power Transducers for Sonics and Ultrasonics, 221–41. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76271-0_18.

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« Appendix : Ultrasonic Sensing Systems in the Air Medium ». Dans Digital Underwater Acoustic Communications, 255–68. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-803009-7.15001-9.

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« Ultrasonic monitoring of lab-scaled underwater landslides ». Dans Landslides and Engineered Slopes. From the Past to the Future, Two Volumes + CD-ROM, 1341–44. CRC Press, 2008. http://dx.doi.org/10.1201/9780203885284-183.

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Actes de conférences sur le sujet "Underwater and ultrasonic"

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Vishwanatha, Meghana, Karman Selvam, Nooshin Saeidi, Maik Wiemer et Harald Kuhn. « Underwater sensing applications using Capacitive Micromachined Ultrasonic Transducers (CMUTs) ». Dans 2024 IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium (UFFC-JS), 1–4. IEEE, 2024. https://doi.org/10.1109/uffc-js60046.2024.10793795.

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Li, Yujia, King Shing Lo, Dongmei Huang, Chao Lu et P. K. A. Wai. « High-sensitivity, high-speed underwater ultrasonic detection based on time-stretched self-coherent detection ». Dans CLEO : Applications and Technology, JTu2A.110. Washington, D.C. : Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jtu2a.110.

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A MHz-level underwater ultrasonic wave with the kPa-level pressure is detected by the time-stretched self-coherence system with a high speed and highly coherent swept laser, which is significant for ultrasound detection.

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Bakar, S. A. A., N. R. Ong, M. H. A. Aziz, J. B. Alcain, W. M. W. N. Haimi et Z. Sauli. « Underwater detection by using ultrasonic sensor ». Dans 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002499.

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Thakare, Dhawal R., Prabhu Rajagopal et Pierre Belanger. « Ultrasonic guided waves in bone system with degradation ». Dans 5th Pacific Rim Underwater Acoustics Conference. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000147.

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Leighton, Timothy G. « The acoustic bubble : Oceanic bubble acoustics and ultrasonic cleaning ». Dans 5th Pacific Rim Underwater Acoustics Conference. Acoustical Society of America, 2015. http://dx.doi.org/10.1121/2.0000121.

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Gerdt, David W., Martin C. Baruch et Charles M. Adkins. « Ultrasonic liquid crystal-based underwater acoustic imaging ». Dans Electronic Imaging '99, sous la direction de Ranganathan Shashidhar. SPIE, 1999. http://dx.doi.org/10.1117/12.343873.

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Norli, Petter, Emilie Vallée, Magne Aanes, Asbjørn Spilde, Henrik Duerud, Fabrice Prieur, Tore Bjåstad, Øyvind Standal et Martijn Frijlink. « Ultrasonic detection of stress corrosion cracks in gaseous atmosphere using Broadband transducers ». Dans International Conference on Underwater Acoustics. ASA, 2019. http://dx.doi.org/10.1121/2.0001334.

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SAILLANT, JF, S. TRIGER, F. AFROUKH, J. WALLACE, L. WANG, S. COCHRAN et D. CUMMING. « MOSAIC : A SCALABLE, MODULAR SYSTEM FOR UNDERWATER ULTRASONIC IMAGING ». Dans DETECTION & ; CLASSIFICATION OF UNDERWATER TARGETS 2007. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17797.

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Kleiman, Jacob, Yuri Kudryavtsev et Alexander Lugovskoy. « Underwater Stress Relief and Fatigue Improvement by Ultrasonic Peening ». Dans ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83469.

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A new ultrasonic peening instrument was developed for underwater treatment of welds and welded structures. The Ultrasonic Peening (UP) established itself as a promising process for fatigue life improvement of welded elements and structures. The beneficial effect of UP is obtained through relieving of harmful tensile residual stresses and introducing of compressive residual stresses into surface layers of materials, and through decreasing of stress concentration in weld toe zones and enhancement of mechanical properties of the surface layers of the materials. In the design of the underwater UP instrument specially selected anti-corrosion materials are used. The underwater UP instrument can be used for treatment of welds at depths up to 30 meters or, if required, with certain modifications, even deeper. Acoustic pump principle is used in the originally developed system for water cooling of the transducer. The developed UP system allows for improvement treatments at four different power levels and is using replaceable working heads that come in various configurations with variable numbers of pins, depending on the application.

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SCUDDER, LP, DA HUTCHINS et JT MOTTRAM. « THE ULTRASONIC IMPULSE RESPONSE OF UNIDIRECTIONAL CARBON FIBRE LAMINATES ». Dans Acoustics of Advanced Materials for Underwater Applications 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20599.

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