A method of observing the sound field in transient radiation from a piston source.

IEICE Electron. Express

2019

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Vibration characteristics of two types of piezoelectric transducers with whole-surface electrode and a partially electrode were driven in the thickness direction in air and water acoustic loading on the acoustic radiation surface. Partial electrode transducers had an acoustic loading on the side surface, which is called "siding". Use of partial electrode transducer allowed the lateral vibration on the acoustic radiation surface to be flattened, and thickness vibration becomes almost uniform. Schlieren observation and wavenumber analysis indicate that lateral waves were identified as Lamb waves. An A1 mode Lamb wave is given as a sample to verify the usefulness of this method.

Section: Transducer With Sidingmentioning

confidence: 99%

“…For this reason, vibration of the transducer is not like piston source and vibration velocity is distributed on the surface of transducer [2,3,4,5]. As a result, the sound field is not always generated as represented by Rayleigh integral [6,7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Use of energy trapping type piezoelectric transducer to suppress lateral vibration in the transducer

IEICE Electron. Express

2019

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“…The most tentative method for observing a sound field of ultrasonic waves is to scan a miniature hydrophone in a field such as water [1]. The resulting output is directly proportional to the sound pressure of the ultrasonic wave.…”

mentioning

confidence: 99%

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

IEICE Electron. Express

2014

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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.

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

J. Acoust. Soc. Jpn. (E), J Acoust Soc Jpn E

Yoshida

Okuyama

1991

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