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.
| Original language | English |
|---|---|
| Pages (from-to) | 114-121 |
| Number of pages | 8 |
| Journal | Journal of Testing and Evaluation |
| Volume | 27 |
| Issue number | 2 |
| Publication status | Published - 1999 Mar 1 |
| Externally published | Yes |
Keywords
- 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