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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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Related Experiment Video

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Long-Range Distributed Solar Irradiance Sensing Using Optical Fibers.

Regina Magalhães1, Luis Costa1, Sonia Martin-Lopez1

  • 1Dpto. de Electrónica, Universidad de Alcalá, 28805 Alcalá de Henares (Madrid), Spain.

Sensors (Basel, Switzerland)
|February 13, 2020
PubMed
Summary

This study introduces a novel fiber-based distributed sensor for real-time solar irradiance monitoring. The technology offers meter-scale spatial resolution over long distances, crucial for climate and solar energy applications.

Keywords:
distributed sensingoptical fiber sensorsoptical radiationoptical time domain reflectometryphotothermal effectsrayleigh scatteringsolar energysolar irradiance

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Area of Science:

  • Environmental Science
  • Optical Engineering
  • Renewable Energy Technology

Background:

  • Solar irradiance was historically assumed constant, but evidence shows significant temporal variations.
  • Accurate ground-level solar irradiance monitoring is vital for climate studies and optimizing solar energy systems.

Purpose of the Study:

  • To develop and validate a novel fiber-based distributed sensor for real-time ground solar irradiance monitoring.
  • To achieve meter-scale spatial resolution over extended distances (up to 100 km).

Main Methods:

  • Utilized a coherent phase Optical Time-Domain Reflectometry (CP-ϕOTDR) technique.
  • Employed a single optical fiber cable and interrogator unit for long-range, high-sensitivity bolometric measurements.
  • Developed a theoretical framework and validated the method using a solar simulator.

Main Results:

  • Demonstrated the capability for real-time monitoring of ground solar irradiance.
  • Achieved meter-scale spatial resolution over tens of kilometers.
  • Quantified solar irradiance with a resolution better than 0.1 W/m².

Conclusions:

  • The proposed fiber-based sensor is the first of its kind for distributed solar irradiance monitoring.
  • This technology enables precise, real-time measurement of solar irradiance over large areas.
  • The sensor has significant implications for climate change research and solar energy management.