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Dynamic sensor interrogation using wavelength-swept laser with a polygon-scanner-based wavelength filter.

Yong Seok Kwon¹, Myeong Ock Ko, Mi Sun Jung

¹Department of Physics, Chungnam National University, Daejeon 305-764, Korea. kyss4133@gmail.com

Sensors (Basel, Switzerland)

|August 1, 2013

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This study presents a high-speed dynamic multiplexed fiber Bragg grating (FBG) sensor interrogation system. The novel approach achieves rapid strain measurement using a wavelength-swept laser (WSL) for advanced sensing applications.

Area of Science:

Photonics and Optical Sensing
Fiber Optic Sensors
Instrumentation and Measurement

Background:

Dynamic strain monitoring requires high-speed and sensitive interrogation systems.
Multiplexed fiber Bragg grating (FBG) sensors offer distributed sensing capabilities.
Traditional interrogation methods can be limited in speed and resolution.

Purpose of the Study:

To develop and demonstrate a high-speed dynamic multiplexed FBG sensor interrogation system.
To achieve real-time measurement of dynamic strain using a wavelength-swept laser (WSL).
To evaluate the performance of the system in terms of speed, sensitivity, and signal quality.

Main Methods:

Utilized a wavelength-swept laser (WSL) with a polygon-scanner-based filter for rapid wavelength scanning (~18 kHz).

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Employed a multiplexed array of five FBGs with distinct Bragg wavelengths.

Applied dynamic periodic strain (500 Hz to 2 kHz) to an FBG sensor mounted on a piezoelectric transducer.

Main Results:

Achieved a high-speed dynamic FBG sensor interrogation with a measuring speed of 18 kHz.
Successfully recorded fast Fourier transform (FFT) spectra of the FBGs, demonstrating good dynamic performance.
Obtained a signal-to-noise ratio (SNR) greater than 30 dB and a bandwidth of approximately 10 Hz.
Demonstrated real-time measurement of abrupt changes in periodic strain.

Conclusions:

The developed dynamic FBG sensor interrogation system, utilizing a WSL, enables high-speed and high-sensitivity real-time measurements.
The system is suitable for applications requiring rapid monitoring of dynamic strain.
The polygon-scanner-based WSL filter facilitates efficient and fast interrogation of multiplexed FBG sensors.