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A Preliminary Experimental Analysis of In-Pipe Image Transmission Based on Visible Light Relay Communication.

Wen Zhao1, Mitsuhiro Kamezaki2, Kaoru Yamaguchi3

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Digital image frame relay transmission (DIFRT) offers superior performance for robot inspection systems. This visible light relay communication method enables high-quality, long-range image transmission in challenging environments.

Keywords:
image qualitypipe inspectionvisible light relay communication (VLRC)

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Area of Science:

  • Robotics and Automation
  • Optical Communications
  • Infrastructure Monitoring

Background:

  • Regular inspection of underground facilities like pipelines is critical to prevent disasters.
  • Existing robot chain systems (RCS) for pipe inspection lack robust image transmission capabilities.
  • Visible light relay communication (VLRC) offers potential for stable, high-rate in-pipe data transmission and illumination.

Purpose of the Study:

  • To analyze the performance of VLRC-based image transmission for pipe inspection robots.
  • To develop and compare analog and digital image signal transmission methods for RCS.
  • To establish a high-quality, long-range, and efficient image transmission strategy for complex infrastructure inspection.

Main Methods:

  • Proposed two transmission systems: analog image signal relay transmission (AISRT) and digital image frame relay transmission (DIFRT).
  • Conducted experiments including waveform tests, bit error rate (BER) analysis, and transmission tests in different mediums (air, water).
  • Evaluated image transmission quality, reconstruction quality, and data rates.

Main Results:

  • DIFRT demonstrated superior image transmission and reconstruction quality compared to AISRT.
  • DIFRT effectively overcame signal attenuation from absorption and scattering effects.
  • DIFRT achieved stable operation at 50 kbps with low BER in both air and water environments, extending transmission range.

Conclusions:

  • DIFRT is a more effective method for high-quality, long-range image transmission in pipe inspection robots.
  • VLRC-based DIFRT provides a stable, efficient, and high-speed solution for robot communication in challenging environments.
  • This technique offers a new strategy for robotic inspection in diverse special environments like tunnels, mines, and underwater settings.