Ultrasonic Signal-Transmission Techniques for Compact Microtunneling Systems

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

Original languageEnglish
Pages (from-to)456-464
Number of pages9
JournalIEEJ Transactions on Sensors and Micromachines
Issue number9
Publication statusPublished - 1997
Externally publishedYes


  • Air bubbles
  • Microtunneling
  • Pilot pipe
  • Pulse signal
  • Soil particles
  • Ultrasonic attenuation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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