Observation of the sound field in transient radiation from a concave piston source using time-transition pattern.

Imano, Kazuhiko; Yoshida, Yasuo; Okuyama, Daitaro

doi:10.1250/ast.12.237

Cited by 5 publications

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References 4 publications

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“…It is seen from Fig. 4(a) that the wavefront of the concave transducer becomes a "plane" near the focal point while the wavefronts of the upward convex and downward convex transducers are replaced before and behind the focal point as described in an earlier study [6]. In Fig.…”

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Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging

Imano

2014

IEICE Electron. Express

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Abstract:The pulse inversion averaging (PIA) method is introduced to the shadowgraph imaging system to visualize the second-harmonic component of the ultrasonic field. The principle of the PIA method is summarized and the method is customized for observing an second-harmonic ultrasonic field. An experiment of a shadowgraph with PIA using a 1-MHz concave focused transducer is conducted to evaluate the system. The fundamental component of 1 MHz is suppressed more than 30 dB with respect to the second-harmonic component. With this system, both a normal shadowgraph image and a second-harmonic image are visualized in real time.

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confidence: 66%

Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging

Imano

2014

IEICE Electron. Express

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A simple method for generating the monopole ultrasonic pulse and its sound field

Imano

Inoue²

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)

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Abslrad -The cycloid function voltage having no resonant component is applied to the piezo-ceramic planar and concave circular transducers to generate the monopole ultrasonic pulse. On-axis pressure characteristics of two kinds of transducer are observed using monopole ultrasonic pulse. As the experimental results, 1) the sound field of monopole ultrasonic pulse is consisted of direct wave and edge wave, and these are separated in time near the transducer, 2) the monopole ultrasonic pulse from a planar transducer becomes bipolar pulse in the large distance from the transducer and 3) in case of the concave transducer, the monopole ultrasonic pulse is gradually changed to the bipolar pulse around the focus, are clearly observed. These experimental results can be explained by the interference between direct wave and edge wave using monopole ultrasonic pulse. A possibilities of the diffraction effect which dominated at the focus of wncave transducer is also suggested. lotductionThe sound field of transient radiation from a piston source has been studied theoraically using impulse response method". Recently, we have developed a simple method for and experimentally using optical" and acoustic generating the monopole ultrasonic pulse radiated from a plane circular piston transducer". Our method have the advantages which are simple and low cost technique for generating the monopole ultrasonic pulse using a conventional piezoelectric transducer without backing, matching layer or any complex electrical circuits. Monopole ultrasonic pulse is needed not only in the field such as imaging or nondestructive inspection of materials hut also in the observation of transient acoustic field". In this paper, onaxis pressure characteristics of monopole ultrasonic pulse radiated from a planar and concave transducer are investigated, The method and system are briefly explained and the experimental results will be demonstrated to clarify the usefulness of monopole ultrasonic pulse in the analysis of field components. *eolyll" 0-7803-4153-8/97/$10.00 0 1997 IEEE System and method planar or concave transducer immersed in the water tank was Fig.1 shows the experimental arrangement. The PZT excited by a cycloid function voltage v,(t) having a finite raise time I as indicated in Fig.2(a). E x -i I Ilt 2 I r Yr (n)Wavebnn ofcyebd h h n @)frsguercy specmm of u r f cycbd 6 r r h Fig2 Cycbid function (a) and its frequency specbum@).Exciting voltage v,(r) can be expressed as,

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A Basic Experimental Study for Imaging by Monopolar Pulse Radiated from Concave Polyvinylidene Fluoride (PVDF) Transducer

Ooyashiki¹,

Yoshida²,

Inoue³

et al. 2004

Jpn. J. Appl. Phys.

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Observation of the sound field in transient radiation from a concave piston source using time-transition pattern.

Abstract: Observation of the sound field in transient radiation from a concave piston source using time-transition pattern

Cited by 5 publications

References 4 publications

Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging

Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging

A simple method for generating the monopole ultrasonic pulse and its sound field

A Basic Experimental Study for Imaging by Monopolar Pulse Radiated from Concave Polyvinylidene Fluoride (PVDF) Transducer

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