Real-time near-field acoustic holography for continuously visualizing nonstationary acoustic fields

2010 ◽  
Vol 128 (6) ◽  
pp. 3554-3567 ◽  
Author(s):  
J.-H. Thomas ◽  
V. Grulier ◽  
S. Paillasseur ◽  
J.-C. Pascal ◽  
J.-C. Le Roux
Keyword(s):  
Real Time ◽  
Near Field ◽  
Acoustic Fields ◽  
Acoustic Holography

scholarly journals Instantaneous Bayesian regularization applied to real-time near-field acoustic holography

2017 ◽  
Vol 142 (2) ◽  
pp. 924-934 ◽  
Author(s):  
Thibaut Le Magueresse ◽  
Jean-Hugh Thomas ◽  
Jérôme Antoni ◽  
Sébastien Paillasseur
Keyword(s):  
Real Time ◽  
Near Field ◽  
Bayesian Regularization ◽  
Acoustic Holography

Bayesian regularization applied to real-time near-field acoustic holography

2014 ◽  
Vol 136 (4) ◽  
pp. 2171-2171
Author(s):  
Thibaut Le Magueresse ◽  
Jean-Hugh Thomas ◽  
Jérôme Antoni ◽  
Sébasien Paillasseur
Keyword(s):  
Real Time ◽  
Near Field ◽  
Bayesian Regularization ◽  
Acoustic Holography

Regularization for improving the deconvolution in real-time near-field acoustic holography

2011 ◽  
Vol 129 (6) ◽  
pp. 3777-3787 ◽  
Author(s):  
Sébastien Paillasseur ◽  
Jean-Hugh Thomas ◽  
Jean-Claude Pascal
Keyword(s):  
Real Time ◽  
Near Field ◽  
Acoustic Holography

Real-time Approximation of Photometric Polygonal Lights

2020 ◽  
Vol 3 (1) ◽  
pp. 1-18
Author(s):  
Christian Luksch ◽  
Lukas Prost ◽  
Michael Wimmer
Keyword(s):  
Real Time ◽  
Specular Reflection ◽  
Near Field ◽  
Measurement Data ◽  
Data Sets ◽  
Photometric Measurement ◽  
Integration Technique ◽  
Time Approximation ◽  
Light Emitter ◽  
Selection Of

We present a real-time rendering technique for photometric polygonal lights. Our method uses a numerical integration technique based on a triangulation to calculate noise-free diffuse shading. We include a dynamic point in the triangulation that provides a continuous near-field illumination resembling the shape of the light emitter and its characteristics. We evaluate the accuracy of our approach with a diverse selection of photometric measurement data sets in a comprehensive benchmark framework. Furthermore, we provide an extension for specular reflection on surfaces with arbitrary roughness that facilitates the use of existing real-time shading techniques. Our technique is easy to integrate into real-time rendering systems and extends the range of possible applications with photometric area lights.

Towards real-time fire data synthesis using numerical simulations

2021 ◽  
pp. 073490412199344
Author(s):  
Wolfram Jahn ◽  
Frane Sazunic ◽  
Carlos Sing-Long
Keyword(s):  
Real Time ◽  
Computational Fluid Dynamic ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Near Field ◽  
Computing Time ◽  
Temperature Correction ◽  
Dynamic Simulations ◽  
Conservation Of Energy ◽  
Fire Scenarios

Synthesising data from fire scenarios using fire simulations requires iterative running of these simulations. For real-time synthesising, faster-than-real-time simulations are thus necessary. In this article, different model types are assessed according to their complexity to determine the trade-off between the accuracy of the output and the required computing time. A threshold grid size for real-time computational fluid dynamic simulations is identified, and the implications of simplifying existing field fire models by turning off sub-models are assessed. In addition, a temperature correction for two zone models based on the conservation of energy of the hot layer is introduced, to account for spatial variations of temperature in the near field of the fire. The main conclusions are that real-time fire simulations with spatial resolution are possible and that it is not necessary to solve all fine-scale physics to reproduce temperature measurements accurately. There remains, however, a gap in performance between computational fluid dynamic models and zone models that must be explored to achieve faster-than-real-time fire simulations.

scholarly journals Investigation on Wireless Link for Medical Telemetry Including Impedance Matching of Implanted Antennas

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1431
Author(s):  
Ilkyu Kim ◽  
Sun-Gyu Lee ◽  
Yong-Hyun Nam ◽  
Jeong-Hae Lee
Keyword(s):  
Real Time ◽  
Human Body ◽  
Near Field ◽  
Impedance Matching ◽  
The Body ◽  
Field Pattern ◽  
Communication Link ◽  
Far Field ◽  
Antenna Coupling ◽  
Medical Telemetry

The development of biomedical devices benefits patients by offering real-time healthcare. In particular, pacemakers have gained a great deal of attention because they offer opportunities for monitoring the patient’s vitals and biological statics in real time. One of the important factors in realizing real-time body-centric sensing is to establish a robust wireless communication link among the medical devices. In this paper, radio transmission and the optimal characteristics for impedance matching the medical telemetry of an implant are investigated. For radio transmission, an integral coupling formula based on 3D vector far-field patterns was firstly applied to compute the antenna coupling between two antennas placed inside and outside of the body. The formula provides the capability for computing the antenna coupling in the near-field and far-field region. In order to include the effects of human implantation, the far-field pattern was characterized taking into account a sphere enclosing an antenna made of human tissue. Furthermore, the characteristics of impedance matching inside the human body were studied by means of inherent wave impedances of electrical and magnetic dipoles. Here, we demonstrate that the implantation of a magnetic dipole is advantageous because it provides similar impedance characteristics to those of the human body.

Real-Time Focal Spot Profiling for the Adjustment of the Focus in Near Field Recording System

2002 ◽  
Vol 41 (Part 1, No. 11A) ◽  
pp. 6380-6385
Author(s):  
Hyeong Ryeol Oh ◽  
Dae-Gap Gweon ◽  
Jun-Hee Lee ◽  
Sang-Cheon Kim ◽  
See-Hyung Lee ◽  
...  
Keyword(s):  
Real Time ◽  
Focal Spot ◽  
Near Field ◽  
Recording System ◽  
Field Recording
Sign in / Sign up

Export Citation Format

Share Document