Nonlinear sound propagation on acoustic phased array

Fujisawa, Kazuo; Asada, Akira

doi:10.1016/j.apacoust.2015.02.014

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…This acoustic technique has been reported by many previous papers for its acoustic characteristic such as high directivity with low side-lobe beam. Especially, it has been used with pulse echo method in underwater imaging [12]- [16] and underwater acoustic communication [17].…”

Section: Methodsmentioning

confidence: 99%

Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact

Fujisawa¹,

Asada²

2016

JFCMV

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A novel technique for reducing reverberation artifact in acoustic shadow imaging using nonlinear ultrasound interaction, called nonlinear acoustic shadow method, has been developed and experimentally studied. In this technique, the conventional acoustic shadow method is modified by using the secondary wave generated by nonlinear interaction of two primary sound waves emitted from parametric array. Either conventional or nonlinear acoustic shadow imaging is carried out for aluminum square cylinder and the size of the shadow is compared. The result shows that the nonlinear acoustic shadow method reduces reverberation artifact inside the square cylinder and has better accuracy in the size measurement than conventional acoustic shadow method.

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Section: Methodsmentioning

confidence: 99%

Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact

Fujisawa¹,

Asada²

2016

JFCMV

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“…17 Since then, many later works have been done for the digital beam steering for parametric loudspeakers including the digital implementation of a beam steering algorithm, active noise control system, and the introduction of pre-processing methods. [18][19][20][21] In spite of these successes of the PD model, there are some mismatches between the measured directivities and the theoretical results. Shi and Gan revisited the original theories, proposed three modified models for the directivity of the dif-ference frequency waves, and compared the numerical results with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Design of Ultrasonic Transducer for Secondary Wave Generations with High Directivity

Kim¹,

Kim²,

Ri³

2019

The International Journal of Acoustics and Vibration

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In this paper, we described a method of designing ultrasonic transducer which simultaneously radiates two finite-amplitude ultrasonic waves to produce the secondary waves with high directivity. For nonlinear effects, it is necessary that the frequencies of two primary waves are coincident with natural frequencies of the ultrasonic transducer. The main problem here is to predict the resonance frequencies of the first mode as well as higher modes. While the first resonance frequency of the transducer can be estimated easily, it is not trivial to do higher ones. When the length of transducer is much greater than its diameter, this problem is reduced to one-dimensional and higher mode frequencies are nothing but multiples of the first mode frequency. However, such a case is seldom encountered. Using the transfer matrix method, we obtained the resonance frequencies of the transducer analytically and compared these with numerical results from the simulation. The theoretical and simulation results are in good agreement with the difference of 3--6 kHz.

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“…Acoustic phased array has become a noninvasive device featuring the large acoustic energy, high signal-to-noise ratio and high azimuth resolution of acoustic sound beam. [1] It is also convenient to simultaneously generate dynamic focusing and steering beams, and this flexibility can make ultrasonic inspections rapid and cost-effective. [2] In addition, phased array has been introduced to nonlinear acoustic applications, such as harmonic imaging in medical inspection, [3] defect detection in nondestructive evaluation, [4] and underwater communications.…”

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confidence: 99%

Phased Array Beam Fields of Nonlinear Rayleigh Surface Waves

Zhang

Jeong

2016

Chinese Phys. Lett.

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This study concerns calculation of phased array beam fields of the nonlinear Rayleigh surface waves based on the integral solutions for a nonparaxial wave equation. Since the parabolic approximation model for describing the nonlinear Rayleigh waves has certain limitations in modeling the sound beam fields of phased arrays, a more general model equation and integral forms of quasilinear solutions are introduced. Some features of steered and focused beam fields radiated from a linear phased array of the second harmonic Rayleigh wave are presented.

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Nonlinear sound propagation on acoustic phased array

Cited by 8 publications

References 17 publications

Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact

Nonlinear Acoustic Shadow Method to Reduce Reverberation Artifact

Design of Ultrasonic Transducer for Secondary Wave Generations with High Directivity

Phased Array Beam Fields of Nonlinear Rayleigh Surface Waves

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