Wave phase conjugation of ultrasonic beams

Brysev, A. P.; Krutyanskii, L. M.; Preobrazhenskii, V.V.

doi:10.1070/pu1998v041n08abeh000429

Cited by 62 publications

(22 citation statements)

References 13 publications

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“…Considering that the acoustic properties of materials can be modulated much more effectively than the electromagnetic ones (the acoustic index modulation can reach tens of percents in magneto-acoustic crystals [16]), the proposed approach to acoustic non-reciprocity appears particularly attractive for sound and ultrasound applications. In addition, this solution opens exciting opportunities for high-power applications when translated back to the electromagnetic domain, for which conventional magnetic-based circulators cannot be applied, and the electronic modulation considered in recent papers [13,17] would fail.…”

Section: Discussionmentioning

confidence: 99%

Subwavelength ultrasonic circulator based on spatiotemporal modulation

2015

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Section: Discussionmentioning

confidence: 99%

Subwavelength ultrasonic circulator based on spatiotemporal modulation

2015

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“…The research of TR can date back to early 1970s, when phase conjugation was first observed and studied by Zeldovich et al [28]. Unlike the phase conjugation that uses an holographic or parametric pumping [29], the TR uses transducers to record the signal waves and enables signal processing on the recorded waveforms.…”

Section: A the Basic Principles Of Trmentioning

confidence: 99%

“…User estimates the symbol by the sample . Note that (29) represents the received signal when the rate backoff factor > . When < , the received waveforms of different symbols overlap with each other and give rise to the ISI.…”

Section: A Advanced Waveform Designmentioning

confidence: 99%

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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“…It appears possible only with transition to a position of the observer of laboratory system of reference, and in this sense is effect typically of a relativistic nature. As at transformation of a wave there is an inversion its wave normal, this phenomenon can be classified as specific, relativistic version of the known phenomenon of conjugation of wave front (Fisher, 1983;Brysev et al, 1998;Fink et al, 2000). But if in a basis of the processes, described in the literature, the parametrical effects put, nonlinear first of all, here conjugation of wave front is provided with the linear laws of Galilean kinematics.…”

Section: Shear Elastic Wave Refraction On a Gap Between Piezoelectricmentioning

confidence: 99%