Volume 27, Issue 2 (March 1999)

    Ultrasonic Signal-Transmission Techniques for Compact Microtunneling Systems

    CODEN: JTEOAD

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    Abstract

    This paper describes ultrasonic transmission techniques for sensor signals transmitted through water-filled pilot pipes for underground microtunneling systems. Underwater ultrasonic waves are used for transmitting the orientation and location signals of a remote-controlled machine. We have investigated the relationship between ultrasonic transmission loss and frequency with propagation distance in water-filled pipes. Digital signals can be transmitted at 100 bps for more than 50 m in 80-mm-diameter steel pipes by using underwater ultrasonic pulse waves above 300 kHz. A compact prototype ultrasonic transmitter and receiver were developed, making it possible to transmit and receive 8-bit signals through flowing water in the pilot pipes by processing their signal waveforms. Field trials demonstrated a range of signal transmission of pitching angle data over a 40-m distance for an actual compact microtunneling system.


    Author Information:

    Honjoh, K
    Senior engineer, Technical Assistance & Support Center, Nippon Telegraph and Telephone Corp. (NTT),

    Hoshiya, K
    Senior research engineer, Integrated Information & Energy Systems Labs., NTT, Tokyo,

    Nakano, S
    research engineer, Integrated Information & Energy Systems Labs., NTT, Tokyo,

    Kuwano, H
    Senior manager, NTT, Tokyo,


    Stock #: JTE12049J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12049J

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    Author
    Title Ultrasonic Signal-Transmission Techniques for Compact Microtunneling Systems
    Symposium , 0000-00-00
    Committee E07