Results 31 to 40 of about 232,569 (291)

An Optical Acoustic Detection System Based on Fabry Pérot Etalon Stability Structure

Micromachines, 2021
The optical acoustic detection system based on the Fabry Pérot Etalon (FPE) with high quality–factor (High Q) and stability structure is described and tested.
Liyun Wu, Yongqiu Zheng, Chenyang Xue, Jiandong Bai, Jiamin Chen   +4 more
doaj   +1 more source

Feature Detection of Acoustically Induced Sea Surface Micro-motions with Terahertz Radar

Leida xuebao, 2023
When underwater acoustic signals propagate to the water surface, the acoustic impedance difference between water and air leads to transverse microamplitude waves on the water surface.
Bin DENG, Tao LI, Bin TANG, Jun YI, Hongqiang WANG, Qi YANG   +5 more
doaj   +1 more source

On noise treatment in radio measurements of cosmic ray air showers [PDF]

, 2010
Precise measurements of the radio emission by cosmic ray air showers require an adequate treatment of noise. Unlike to usual experiments in particle physics, where noise always adds to the signal, radio noise can in principle decrease or increase the ...
A. Chiavassa, A. Haungs, A. Horneffer, A. Saftoiu, A. Schmidt, A. Weindl, Apel, C. Grupen, C. Morello, C. Rühle, D. Fuhrmann, D. Heck, D. Huber, D. Kang, E. Cantoni, F.G. Schröder, G. Toma, G.C. Trinchero, H. Bozdog, H. Falcke, H. Gemmeke, H. Rebel, H. Schieler, H.J. Mathes, I.M. Brancus, J. Blümer, J. Kuijpers, J. Oehlschläger, J. Rautenberg, J. Wochele, J. Zabierowski, J.A. Zensus, J.C. Arteaga, J.R. Hörandel, K. Bekk, K. Daumiller, K. Link, K.-H. Kampert, L. Bähren, M. Bertaina, M. Finger, M. Ludwig, M. Melissas, M. Roth, M. Wommer, N. Palmieri, Nehls, O. Krömer, O. Sima, P. Buchholz, P. Doll, P. łuczak, P.G. Isar, P.L. Biermann, R. Engel, S. Buitink, S. Lafebre, S. Nehls, Schröder, T. Asch, T. Huege, T. Pierog, V. de Souza, W.D. Apel   +63 more
core   +2 more sources

Underwater Acoustic Detection of Ultra High Energy Neutrinos

, 2005
We investigate the acoustic detection method of 10^18-20 eV neutrinos in a Mediterranean Sea environment. The acoustic signal is re-evaluated according to dedicated cascade simulations and a complex phase dependant absorption model, and compared to ...
Aguilar, Alvarez-Muniz, Alvarez-Muniz, Anthony, Askariyan, Askariyan, Bertou, Blankenbecler, Brown, Dedenko, Feldman, Fletcher, Francois, Gandhi, Glashow, Gorham, Greisen, Greisen, Hansen, Hotta, Knudsen, Landau, Landau, Learned, Lehtinen, Liebermann, Migdal, Nagano, Smirnov, Stanev, Sulak, Urick, V. Bertin, V. Niess, Waxman, Zaptsepin   +35 more
core   +3 more sources

Acoustic Velocity Correcting Method for the Tilted Acoustic Tube in Testing of Pile by Ultrasonic Transmission

Advances in Civil Engineering, 2020
The finite element software ABAQUS was used to simulate the detection of piles by ultrasonic transmission. The influence of the tilted acoustic tube on the testing results of the pile was analyzed. The results showed that, when the pile was complete, the
Yongqiang Cui, Zhitao Ma, Yachao Yang, Daifu Song   +3 more
doaj   +1 more source

Sensing Devices for Detecting and Processing Acoustic Signals in Healthcare

Biosensors, 2022
Acoustic signals are important markers to monitor physiological and pathological conditions, e.g., heart and respiratory sounds. The employment of traditional devices, such as stethoscopes, has been progressively superseded by new miniaturized devices, usually identified as microelectromechanical systems (MEMS).
Norma Mallegni, Giovanna Molinari, Claudio Ricci, Andrea Lazzeri, Davide La Rosa, Antonino Crivello, Mario Milazzo   +6 more
openaire   +5 more sources

Coherently refreshed acoustic phonons for extended light storage [PDF]

, 2019
Acoustic waves can serve as memory for optical information, however, acoustic phonons in the GHz regime decay on the nanosecond timescale. Usually this is dominated by intrinsic acoustic loss due to inelastic scattering of the acoustic waves and thermal ...
Eggleton, B., Ma, P., Madden, S., Merklein, M., Stiller, B., Vu, K., Wolff, C.   +6 more
core   +5 more sources

An Acoustic Source Localization Method Using a Drone-Mounted Phased Microphone Array

Drones, 2021
Currently, the detection of targets using drone-mounted imaging equipment is a very useful technique and is being utilized in many areas. In this study, we focus on acoustic signal detection with a drone detecting targets where sounds occur, unlike image-
Yeong-Ju Go, Jong-Soo Choi
doaj   +1 more source

Unsupervised Spoken Term Detection with Spoken Queries by Multi-level Acoustic Patterns with Varying Model Granularity

, 2015
This paper presents a new approach for unsupervised Spoken Term Detection with spoken queries using multiple sets of acoustic patterns automatically discovered from the target corpus.
Chan, Chun-an, Chung, Cheng-Tao, Lee, Lin-shan   +2 more
core   +1 more source

Deciphering acoustic emission signals in drought stressed branches: the missing link between source and sensor [PDF]

, 2015
When drought occurs in plants, acoustic emission (AE) signals can be detected, but the actual causes of these signals are still unknown. By analyzing the waveforms of the measured signals, it should, however, be possible to trace the characteristics of ...
Hamstad, Marvin A, Sause, Markus GR, Steppe, Kathy, Vergeynst, Lidewei   +3 more
core   +3 more sources