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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...

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Updated: Jun 5, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Published on: November 7, 2016

Time-division multiplexing-based BOTDA over 100 km sensing length.

Yongkang Dong1, Liang Chen, Xiaoyi Bao

  • 1Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada. aldendong@gmail.com

Optics Letters
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

We developed a long-range Brillouin optical time-domain analysis (BOTDA) system using time-division multiplexing. This method achieves high performance by measuring the entire 100 km fiber in sections.

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Signal Processing

Background:

  • Brillouin optical time-domain analysis (BOTDA) is crucial for distributed fiber sensing.
  • Achieving long-range measurements with high spatial resolution remains a challenge.
  • Existing BOTDA systems face limitations in range and performance.

Purpose of the Study:

  • To propose and demonstrate a high-performance, long-range BOTDA system.
  • To overcome the range limitations of conventional BOTDA techniques.
  • To enable precise measurements over extended fiber optic networks.

Main Methods:

  • Utilizing time-division multiplexing measurement with probe and pump pulses.
  • Dividing a 100 km sensing fiber into 11 sections for measurement.
  • Adjusting the delay time between pulses to combine section measurements.
  • Employing a gain-controlled principle for section division.

Main Results:

  • Demonstrated a high-performance and long-range BOTDA system.
  • Achieved spatial resolutions of 0.6 m at 75 km and 2 m at 100 km.
  • Successfully measured a 100 km sensing fiber by combining sectional data.

Conclusions:

  • The proposed time-division multiplexing BOTDA method enables long-range sensing.
  • The system achieves excellent spatial resolution even at the fiber's end.
  • This technique offers a promising solution for distributed fiber optic sensing applications.