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Simultaneous distributed static and dynamic sensing based on ultra-short fiber Bragg gratings
Optics Express
|August 19, 2018
Summary
This study demonstrates distributed sensing using ultra-short fiber Bragg gratings (USFBGs) for simultaneous static temperature and dynamic vibration measurements. The novel USFBG array enables precise detection of temperature changes and nε-scale vibrations.
Area of Science:
- Optoelectronics
- Fiber optic sensing
- Materials science
Background:
- Fiber Bragg gratings (FBGs) are widely used for sensing applications.
- Existing FBG systems often require separate components for sensing and light reflection.
- There is a need for integrated sensing solutions capable of handling both static and dynamic measurements.
Purpose of the Study:
- To demonstrate distributed static and dynamic sensing using an array of ultra-short fiber Bragg gratings (USFBGs).
- To utilize USFBGs as both sensors and reflection mirrors simultaneously.
- To investigate the simultaneous application of static temperature and dynamic vibration to the USFBG array.
Main Methods:
- Fabrication and implementation of an ultra-short fiber Bragg grating (USFBG) array.
- Demodulation of strain-induced or temperature-induced wavelength shifts for static sensing.
- Analysis of phase variation between adjacent USFBG reflected pulses for dynamic sensing.
- Simultaneous application of static temperature and dynamic vibration stimuli.
Main Results:
- Successful distributed static temperature sensing within the range of 30 °C to 80 °C.
- Demonstration of dynamic sensing for nε (nano-strain) scale vibrations.
- Detection of a 12.5 kHz acoustic wave at a sampling rate of 50 kHz.
- Validation of USFBGs acting as both sensors and reflection mirrors.
Conclusions:
- The USFBG array offers a versatile platform for simultaneous distributed static and dynamic sensing.
- This technology enables high-resolution measurement of both temperature and vibration.
- USFBGs present a promising integrated solution for advanced optical sensing applications.
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