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Related Experiment Video

Updated: Mar 12, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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An Optical Fiber Sensor and Its Application in UAVs for Current Measurements.

Felipe S Delgado1, João P Carvalho2, Thiago V N Coelho3

  • 1Electrical Circuit Department, Federal University of Juiz de Fora, Juiz de Fora 36036-330, Brazil. felipe.souza@engenharia.ufjf.br.

Sensors (Basel, Switzerland)
|November 2, 2016
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Summary
This summary is machine-generated.

This study introduces a novel optical sensor using a long-period fiber grating and magnet to measure electrical current in unmanned aerial vehicles (UAVs). The sensor effectively monitors current from 0 to 10 A, offering reliability and fast response times.

Keywords:
current sensorlong-period fiber gratingoptical fiber sensorunmanned aerial vehicle

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Area of Science:

  • Fiber optics sensors
  • Electromagnetic sensing
  • Unmanned aerial vehicle (UAV) technology

Background:

  • Accurate electrical current sensing is crucial for UAV operation and safety.
  • Existing current sensors may have limitations in UAV applications regarding size, weight, or electromagnetic interference.
  • Long-period fiber gratings (LPFGs) offer potential for novel sensing applications due to their sensitivity to physical perturbations.

Purpose of the Study:

  • To propose and experimentally validate a new optical sensor for measuring electrical current in UAVs.
  • To investigate the performance characteristics of the proposed sensor, including linearity, reliability, and response time.
  • To demonstrate the sensor's effectiveness across the UAV engine's operating current range (0-10 A).

Main Methods:

  • A novel sensor design combining a long-period fiber grating (LPFG) with a permanent neodymium magnet.
  • The sensor is integrated with a UAV engine's electrical wire.
  • The electromagnetic force generated by the current induces deformation in the LPFG, causing measurable shifts in its transmission spectrum.

Main Results:

  • The proposed LPFG-based optical sensor successfully measured electrical current in the UAV engine from 0 A to 10 A.
  • The sensor demonstrated good linearity, reliability, and response time over the tested current range.
  • The experimental results confirm the feasibility of using this sensor for effective and practical electrical current monitoring in UAVs.

Conclusions:

  • The developed optical sensor provides an effective and practical solution for electrical current measurement in UAVs.
  • The sensor's performance characteristics meet the desirable criteria for UAV applications.
  • This novel LPFG and magnet combination offers a promising approach for advanced current sensing in aerospace and other fields.