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24 Dec 2007

Volume 91, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 91, 261106 (2007); http://dx.doi.org/10.1063/1.2825578 (3 pages)

W. M. Zhu, T. Zhong, A. Q. Liu, X. M. Zhang, and M. Yu
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Wireless drive of piezoelectric plate by focused electric field

Satyanarayan Bhuyan and Junhui Hu

Appl. Phys. Lett. 91, 264101 (2007); http://dx.doi.org/10.1063/1.2824459 (3 pages) | Cited 2 times

Online Publication Date: 27 December 2007

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Wireless electric energy transmission to a piezoelectric plate using focused ac electric field is explored in this work. The ac electric field is focused, by using a needle ground electrode and plate-shaped live electrode to the piezoelectric plate placed in between them. The needle ground electrode enables better transmission of electric energy. When frequency of the electric field is close to mechanical resonance frequency of the piezoelectric plate operating in the thickness vibration mode, a maximum output power of 46.10 mW has been achieved with an input voltage of 150 Vrms and 2 cm electrode separation.
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77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems

Full-field imaging of nonclassical acoustic nonlinearity

Bart Sarens, Georgios Kalogiannakis, Christ Glorieux, and Danny Van Hemelrijck

Appl. Phys. Lett. 91, 264102 (2007); http://dx.doi.org/10.1063/1.2828111 (3 pages) | Cited 3 times

Online Publication Date: 27 December 2007

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The feasibility of full field shearographic detection of nonclassical acoustic nonlinearity is investigated. Traditional frequency analysis of the sinusoidally excited sample, as used in scanning techniques, turns out to be not practical due to the inherent optical detection nonlinearity of the shearography system itself. An alternative method, based on determining the asymmetry between shearographic images stroboscopically obtained for positive and negative displacements, is proposed. This approach allows us to easily and rapidly detect the tension-compression asymmetry which typically arises where nonbounded contact interface defects are present.
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43.40.Le Techniques for nondestructive evaluation and monitoring, acoustic emission
81.70.Cv Nondestructive testing: ultrasonic testing, photoacoustic testing
43.25.-x Nonlinear acoustics
43.60.Lq Acoustic imaging, displays, pattern recognition, feature extraction

Photoacoustic Doppler flow measurement in optically scattering media

Hui Fang, Konstantin Maslov, and Lihong V. Wang

Appl. Phys. Lett. 91, 264103 (2007); http://dx.doi.org/10.1063/1.2825569 (3 pages) | Cited 19 times

Online Publication Date: 28 December 2007

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We recently observed the photoacoustic Doppler effect from flowing small light-absorbing particles. Here, we apply the effect to measure blood-mimicking fluid flow in an optically scattering medium. The light scattering in the medium decreases the amplitude of the photoacoustic Doppler signal but does not affect either the magnitude or the directional discrimination of the photoacoustic Doppler shift. This technology may hold promise for a new Doppler method for measuring blood flow in microcirculation with high sensitivity.
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47.63.Cb Blood flow in cardiovascular system
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