Concept
Echo sounding
Related publications (26)
Inverse Problems in Pulse-Echo Ultrasound: Exploiting Coherence for Image Enhancement and Quantitative Imaging
Whereas pulse-echo ultrasound imaging relied on focused acoustic waves since its inception, the last two decades have seen the development of techniques based on unfocused waves, including ultrafast ultrasound imaging. In large part due to the emergence of ...
EPFL2024Bed Topography Inference from Velocity Field Using Deep Learning.
Christophe Ancey, Mehrdad Kiani Oshtorjani
Measuring bathymetry has always been a major scientific and technological challenge. In this work, we used a deep learning technique for inferring bathymetry from the depth-averaged velocity field. The training of the neural network is based on 5742 labora ...
2023Combining active and passive acoustic methods to image hydraulic fracture growth in laboratory experiments
Brice Tanguy Alphonse Lecampion, Seyyedmaalek Momeni, Dong Liu
We combine active and passive acoustic measurements to improve the spatio- temporal imaging of hydraulic fracture growth performed under true triaxial confinement in the laboratory. 64 active piezo-electric transducers (54 P waves, 10 S waves) work in sour ...
IOP2021Cooperative Multi-Robot Systems for Aquatic Environmental Sensing
Bringing advantages of parallelism and robustness, distributed robotic systems have become an active subject of research since many years. Yet, the progress in that direction with Autonomous Underwater Vehicles (AUVs) has been limited. This project aims at ...
EPFL2021Directional Cross-Correlation for Improved Aberration Phase Estimation in Pulse-Echo Speed-of-Sound Imaging
Jean-Philippe Thiran, Samuel Denys Beuret, Simon Canales
There has been a recent surge in methods targeting the recovery of a speed-of-sound map from pulse-echo ultrasound measurements. We focused in this work on a particular technique and identified a drawback shared by similar methods - namely the necessity of ...
IEEE2021High-resolution underwater laser spectrometer sensing provides new insights into methane distribution at an Arctic seepage site
Methane (CH4) in marine sediments has the potential to contribute to changes in the ocean and climate system. Physical and biochemical processes that are difficult to quantify with current standard methods such as acoustic surveys and discrete sampling gov ...
Copernicus GmbH2019Remote-sensing and classification of benthic landscapes for satellite derived bathymetry
Bathymetry is a crucial variable for many researches, such as monitoring of the coral ecosystems. Traditional bathymetric measurements are made by echo-sounder, a type of sonar, measuring water depth from sea surface. Nevertheless, this acquisition process ...
2018Flow monitoring of particle-laden flows combining ultrasonic doppler and echo intensity profiling techniques
Giovanni De Cesare, Shun Nomura, Jumpei Hitomi
The methodology to reveal inner structures of turbidity currents are required. Their behaviors have important roles to affect the sedimentation or transportation of fine particles. We have proposed a novel monitoring methodology for flows containing fine p ...
2018Duct modes damping through an adjustable electroacoustic liner under grazing incidence
Hervé Lissek, Romain Boulandet, Gaël Matten
This paper deals with active sound attenuation in lined ducts with flow and its application to duct modes damping in aircraft engine nacelles. It presents an active lining concept based on an arrangement of electroacoustic absorbers flush mounted in the du ...
2018Optimal acoustic rake receiver
Martin Vetterli, Ivan Dokmanic, Robin Scheibler
An acoustic processing method for M acoustic receivers comprising the steps of: Determining a beamforming weight vector with M weights for the M acoustic receivers based on at least one the steering vector of at least one real acoustic source, on steering ...
2016