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Related Experiment Videos

Temperature-insensitive fiber Bragg grating dynamic pressure sensing system.

Tuan Guo1, Qida Zhao, Hao Zhang

  • 1Institute of Modern Optics, Nankai University, Tianjin 300071, China. guotuan2001@163.com

Optics Letters
|July 13, 2006
PubMed
Summary
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A novel fiber Bragg grating (FBG) sensor offers temperature-insensitive dynamic pressure measurement. By modulating reflection bandwidth and detecting optical power, it achieves accurate readings without complex wavelength systems.

Area of Science:

  • Optoelectronics
  • Fiber optic sensing
  • Mechanical engineering

Background:

  • Accurate dynamic pressure measurement is crucial in various industrial applications.
  • Traditional fiber Bragg grating (FBG) sensors are susceptible to temperature fluctuations, complicating measurements.
  • Existing methods often require complex and costly wavelength interrogation systems.

Purpose of the Study:

  • To propose a novel temperature-insensitive dynamic pressure measurement technique.
  • To utilize a single fiber Bragg grating (FBG) sensor for robust pressure sensing.
  • To avoid complex wavelength interrogation systems by employing optical power detection.

Main Methods:

  • A specifically designed double-hole cantilever beam was employed to induce an axial strain gradient on the FBG.

Related Experiment Videos

  • The cantilever beam modulated the reflection spectrum bandwidth of the FBG.
  • Pressure was determined by measuring the reflected optical power, bypassing wavelength analysis.

    • Main Results:

    • The proposed method demonstrated temperature-insensitive dynamic pressure measurement.
    • Bandwidth modulation proved immune to spatially uniform temperature effects.
    • The system achieved an acquisition time of up to 85 Hz.
    • Thermal fluctuation was less than 1.2% full-scale over a -10°C to 80°C range.

    Conclusions:

    • The developed FBG-based sensor provides a simple and effective solution for temperature-insensitive dynamic pressure measurement.
    • Optical power detection combined with bandwidth modulation offers an alternative to complex wavelength interrogation systems.
    • The sensor exhibits high accuracy and fast response times within a broad temperature range.