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

Kazuhiko Imano, Hidekatsu Kawazu, Hiroshi Inoue

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    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 S/N is enhanced. However, it is not simple to attain the requirements for both large bandwidth and high S/N. 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 S/N conditions by adding external noise to the input. When the S/N 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 S/N conditions.

    Original languageEnglish
    Pages (from-to)1-9
    Number of pages9
    JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
    Volume79
    Issue number12
    DOIs
    Publication statusPublished - 1996 Jan 1

    Keywords

    • Coded ultrasonic pulse train
    • D/U ratio
    • S/N ratio
    • Stacked piezoceramic transducer

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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