Multi-frequency parametric phase conjugation of ultrasound beams inmagnetic ceramics

Krutyansky L.; Pernod P.; Preobrazhensky V.

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Multi-frequency parametric phase conjugation of ultrasound beams inmagnetic ceramics

机译：磁性陶瓷中超声波束的多频参量共轭

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A new operation mode of a parametric phase conjugation ofnultrasound waves above the threshold of absolute parametric instabilitynof phonons is reported. A deviation of the carrier frequency in ansequence of incident ultrasound bursts and in a proper sequence ofnelectromagnetic pumping is applied. The deviation avoids amplificationnof the reverberation noise in the active medium when the repetition timenof the conjugation is short enough to be comparable with the relaxationntime of acoustic reverberations. As a result, a decrease of repetitionntime and a correspondent increase of the average output power of a phasenconjugator becomes available. The advantage of the new operation mode isndemonstrated on an example of supercritical phase conjugation innmagnetoacoustic ceramics

机译：报道了声子绝对参数不稳定性阈值以上的超声波参数相位共轭的新操作模式。在入射超声脉冲的顺序和电磁泵浦的适当顺序中应用载波频率的偏差。当共轭的重复时间n短到足以与声学混响的弛豫时间相当时，该偏差避免了有源介质中混响噪声的放大。结果，减少了重复时间并相应地增加了相位共轭器的平均输出功率。以超临界相共轭的非声波陶瓷为例说明了新操作模式的优势

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《IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control》 |2001年第2期|p.609-612|共4页
作者
Krutyansky L.; Pernod P.; Preobrazhensky V.;
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正文语种 eng
中图分类声学工程;计量学;
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ceramics; magnetoacoustic effects; nonlinear acoustics; reverberation; ultrasonic propagation; ultrasonic relaxation; absolute parametric instability of phonons; acoustic reverberations; average output power; carrier frequency deviation; conjugation repetition tim;

机译：陶瓷;磁声效应;非线性声学;混响;超声传播;超声弛豫;声子的绝对参数不稳定性;声混响;平均输出功率;载波频率偏差;共轭重复时间;

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机译：声束参数相位共轭下声脉冲的时间结构控制
2. Estimation of dynamic parameters of overthreshold parametric phase conjugation of ultrasound in magnetostrictive ferrites according to data of quasi-static measurements [J] . A. P. Brysev, P. Pernod, V. Preobrazhensky Physics of wave phenomena . 2008,第2期

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3. A quality of parametric wave phase conjugation of ultrasound [J] . Brysev A., Klopotov R., Krutyansky L. Ultrasonics . 2002,第1a8期

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4. Optical Parametric Oscillator pumped by single-cell-SBS and two-cell-SBS phase-conjugation beam [C] . Qiang Liu, Bin Shi, Mali Gong, Conference on multiphoton absorption and nonlinear transmission processes: Materials, theory, and applications . 2003

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5. Photorefractive properties of ferroelectric materials for optical phase conjugation, two-beam coupling, and holographic storage. [D] . Sayano, Koichi. 1990

机译：铁电材料的光折变特性，用于光学相位共轭，两束耦合和全息存储。
6. A multi-frequency sparse hemispherical ultrasound phased array for microbubble-mediated transcranial therapy and simultaneous cavitation mapping [O] . Lulu Deng, Meaghan A. OReilly, Ryan M. Jones, -1

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Multi-frequency parametric phase conjugation of ultrasound beams inmagnetic ceramics

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