Self focusing in inhomogeneous media with time reversal acoustic mirrors

Fink, Mathias; Prada, Claire; Wu, F.; Cassereau, Didier

doi:10.1109/ultsym.1989.67072

Cited by 267 publications

(166 citation statements)

References 5 publications

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“…As found in acoustic physics [30]- [34] and then further validated in practical underwater propagation environments [35]- [37], the energy of the TR acoustic waves from transmitters could be refocused only at the intended location with very high spatial resolution. Since TR can make full use of multi-path propagation and also requires no complicated channel processing and equalization, it was later verified and tested in wireless radio communication systems.…”

Section: A the Basic Principles Of Trmentioning

confidence: 75%

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Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Chen

Han

Yang

et al. 2014

IEEE Internet Things J.

119

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Abstract-In this paper, we present an overview of the timereversal (TR) wireless paradigm for green Internet of Things (IoT). It is shown that the TR technique is a promising technique that focuses signal waves in both time and space domains. The unique asymmetric architecture significantly reduces the cost of the terminal devices, the total number of which is expected to be very large for IoT. The focusing effect of the TR technique can harvest the energy of all the multi-paths at the receiver, which improves the energy efficiency of the wireless transmission and thus the battery life of terminal devices in IoT. Facilitated by the high-resolution spatial focusing, the TR division multiple access scheme leverages the uniqueness of the multi-path profiles in the rich-scattering environment and maps them into location-specific signatures, so that spatial multiplexing can be achieved for multiple users operating on the same spectrum. In addition, the TR system can easily support heterogeneous terminal devices by providing various quality-of-service (QoS) options through adjusting the waveform and rate backoff factor. Finally, the unique location-specific signature in TR system can provide additional physical-layer security and thus can enhance the privacy and security of customers in IoT. All the advantages show that the TR technique is a promising paradigm for IoT.Index Terms-Internet of Things (IoT), spatial focusing, temporal focusing, time reversal (TR), time-reversal division multiple access (TRDMA).

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Section: A the Basic Principles Of Trmentioning

confidence: 75%

“…Fink et al [30]- [34] found that acoustic energy can be refocused on the source with very high resolution (wavelength level). In [35]- [37], acoustics experiments in the ocean were conducted to validate the focusing effects of TR in real underwater propagation environments.…”

Section: B Temporal Focusing and Spatial Focusing Of Trmentioning

confidence: 99%

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Chen

Han

Yang

et al. 2014

IEEE Internet Things J.

119

View full text Add to dashboard Cite

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“…This study has been developed for four years in our laboratory [1,2,3,4,5,6]. During the elaboration process of titanium, metallurgical inclusion defects such as "hard-alpha" can appear.…”

Section: Basic Experimentsmentioning

confidence: 99%

Ultrasonic Inspection of Titanium Alloys with a Time Reversal Mirror

Chakroun

Miette

Fink

et al. 1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…These ideas were then further expanded by Fink (Fink et al 1989;Fink 1992Fink , 1997, who made TRI better known. The development of theoretical aspects of the method and its application in non-destructive testing were continued by Anderson et al (2009a, b) and Saenger et al (2011).…”

Section: Introductionmentioning

confidence: 99%

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

2017

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The time reversal method has become a standard technique for the location of seismic sources. It has been used both for acoustic and elastic numerical modelling and for 2D and 3D propagation models. Although there are many studies concerning its application to point sources, little so far has been done to generalise the time reversal method to the study of sequences of seismic events. The need to describe such processes better motivates the analysis presented in this paper. The synthetic time reversal imaging experiments presented in this work were conducted for sources with the same origin time as well as for the sources with a slight delay in origin time. For efficient visualisation of the seismic wave propagation and interference, a new coefficient-peak average power ratiowas introduced. The paper also presents a comparison of visualisation based on the proposed coefficient against a commonly used visualisation based on a maximum value.

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Self focusing in inhomogeneous media with time reversal acoustic mirrors

Cited by 267 publications

References 5 publications

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Time-Reversal Wireless Paradigm for Green Internet of Things: An Overview

Ultrasonic Inspection of Titanium Alloys with a Time Reversal Mirror

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

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