Ultrasonic Imaging by Impulse Ultrasound

Okuyama, Daitaro; Yoshida, Yasuo

doi:10.7567/jjaps.23s1.177

Cited by 5 publications

(1 citation statement)

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“…However, it is not simple to increase the peak power. On the other hand, as another approach to these problems, a pulse compression method has been proposed for the bulk wave devices as in the case of SAW devices [9]. In this method, the output signal is obtained by pulse compression, using the correlation of the transmitted pulse train on the receiving side.…”

Section: Introductionmentioning

confidence: 99%

Experiments on transmitting and receiving an ultrasonic pulse train with stacked piezoceramic transducers

Imano

Kawazu

Inoue

1996

Electron Comm Jpn Pt II

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In ultrasonic flaw detection and medical diagnosis, shorter pulses tend to be used for improvement of the time resolution. It is then necessary that the transmitting and receiving systems have large bandwidth. In order to obtain information from the ultrasonic wave in the propagation direction over a long distance, a pulse with high peak power needs to be used so that the SIN is enhanced. However, it is not simple to attain the requirements for both large bandwidth and high SIN. In this paper, a system is proposed in which, instead of using short pulses, the transmitted pulses are combined into a pulse train and pulse compression is carried out on the receiving side by a correlation process, so that short pulse transmission is realized effectively. First, we describe the generation of an ultrasonic pulse train using a stacked piezoceramic transducer made of several piezoceramic resonators without complex electronic circuits. We next describe the principle of the reception correlation process, using stacked transducers with the same characteristics. We fabricated stacked transducers for transmission and reception of an ultrasonic pulse train with a Barker code of length 7. Transmission and reception experiments show that both the transmission of the pulse train and the correlation process are possible. Transmission and reception experiments were carried out under different SINconditions by adding external noise to the input. When the SIN ratio of the transmitting pulse train was 0 dB, a gain of 4.6 dB was obtained. The gain margin was found to be 7.2 dB. Hence, it was demonstrated that the present method is effective under low SIN conditions. 0 1997 Scripta Technica, Inc.Electron Comm Jpn Pt 2,79( 12): 1-9, 1996

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Section: Introductionmentioning

confidence: 99%

Experiments on transmitting and receiving an ultrasonic pulse train with stacked piezoceramic transducers

Imano

Kawazu

Inoue

1996

Electron Comm Jpn Pt II

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Research of SiO2/InP structure prepared by photo-CVD

Haung

1990

JEM

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Effect of substrate temperature on the properties of SiO2/InP structure prepared by photochemical vapor deposition

Huang

1990

Journal of Applied Physics

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The InP metal-oxide-semiconductor structure using SiO2 film as an insulator was deposited by mercury-sensitized photoinduced chemical vapor deposition ultilizing a gaseous mixture of silane (SiH4 ) and nitrous oxide (N2 O) under 253.7-nm ultraviolet light irradiation. The structural and electrical properties of the deposited film were then evaluated with emphasis on the substrate temperature dependence. An increase of the substrate temperature (Tsub ) has effects of increasing the refractive index and decreasing the etching rate, oxide charge density, and interface state density. Postoxidation annealing in a N2 environment at 300 °C decreases the interface states as well as the oxide charge.

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Ultrasonic Imaging by Impulse Ultrasound

Cited by 5 publications

References 0 publications

Experiments on transmitting and receiving an ultrasonic pulse train with stacked piezoceramic transducers

Experiments on transmitting and receiving an ultrasonic pulse train with stacked piezoceramic transducers

Research of SiO2/InP structure prepared by photo-CVD

Effect of substrate temperature on the properties of SiO2/InP structure prepared by photochemical vapor deposition

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