Ultrasonic Signal-Transmission Techniques for Compact Microtunneling Systems

Katsuhiko Honjoh, Kunio Hoshiya, Sadahiko Nakano, Hiroki Kuwano

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)114-121
Number of pages8
JournalJournal of Testing and Evaluation
Issue number2
Publication statusPublished - 1999 Mar 1
Externally publishedYes


  • Air bubbles
  • Flow rate
  • Frequency
  • Micro-tunneling
  • Pilot pipe
  • Pulse signal
  • Soil particles
  • Ultrasonic attenuation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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