Multichannel High-Speed Fiber Bragg Grating Interrogation System Utilizing a Field Programmable Gate Array

Yamaguchi, Tatsuya; Shinoda, Yukitaka

doi:10.1109/lsens.2017.2782670

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…Although high-speed measurements of FBGs have been widely demonstrated in previous studies [5][6][7][8], few studies have focused on signal processing systems for real-time measurements. Thus, we developed a real-time interrogation system based on a fieldprogrammable gate array (FPGA) for high-speed digital signal processing [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

2021

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We develop a high-speed interrogation system with a wavelength-swept laser for sensing multiplexed fiber Bragg gratings (FBGs). High-speed and multipoint sensing is achieved by means of a buffered Fourier domain mode-locked (FDML) laser, a recently proposed high-speed wavelength-swept laser. This laser increases the measurement rate several times by tailoring the laser output with a buffer stage. The developed buffered FDML laser successfully achieves a measurement rate of 202.8 kHz using a general FDML laser driven at a sweep rate of 50.7 kHz. In order to detect reflection signals of FBGs at the high measurement rate, the measurement system introduces digital signal processing using a field programmable gate array (FPGA). However, FBG measurements with wavelength-swept lasers are affected by the propagation time (delay) in the optical fiber connecting from the laser to the FBG sensor, which reduces measurement accuracy. To overcome this limitation, the developed system uses a delay correction method with bidirectional sweep of the buffered FDML laser. The interrogation system with the buffered FDML laser achieves a time resolution of 4.9 µs without being affected by the delay.

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Section: Introductionmentioning

confidence: 99%

High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

2021

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“…A number of techniques were proposed for FBG measurement using spectroscopy, 10,11 laser demodulation, 12 or wavelength scanning 13–21 . Particularly, FBG Bragg wavelength shift can be measured via phase change using interferometry 22 ; this technique offers higher sensitivity than other methods.…”

Section: Introductionmentioning

confidence: 99%

Development of real‐time vibration measurement system by fiber Bragg gratings with pulse light

Yamaguchi

Sugimoto

Shinoda

2020

Elect Comm in Japan

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We developed a vibration measurement system by fiber Bragg gratings (FBGs) with a pulse light. The pulse light is produced by modulating a broadband light with an optical fiber switch at a modulation frequency of 40 kHz. This system enables to separate and detect reflection signals from multiple FBGs like a pulse train. This system achieves multipoint and real‐time vibration measurement by FBGs with a time resolution of 25 µs.

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“…The Fourier-domain mode locking (FDML) technique has recently overcome the limitations of sweep frequency, and allows high-speed operation, beyond tens of kHz [15]. Taking advantage of the FDML laser, research on high-speed FBG interrogation has demonstrated measurement rates of several tens of kHz [16]- [20]. For further improving the multiplexing capabilities, an approach based on low-reflectance FBGs has been proposed [21].…”

Section: Introductionmentioning

confidence: 99%

“…See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. FDML laser [19], [20]. The FDML laser operates with a sweep frequency of 50.7 kHz, sweep band of ∼60 nm, and output power of ∼1.4 mW.…”

Section: Introductionmentioning

confidence: 99%

Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

2019

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We develop a field-programmable gate array (FPGA)-based multichannel measurement system for sensing multiplexed fiber Bragg gratings (FBGs), using a high-speed wavelength-swept laser. The wavelength-swept laser, operated with Fourier-domain mode locking (FDML), exhibits a sweep frequency of 50.7 kHz and sweep band of ∼60 nm. A breakthrough in multichannel and real-time measurement is achieved by implementing an FPGA with unique parallel-processing circuits. This FPGA enables the implementation of a high-speed centroid-peakdetection circuit for FBG detection, which can be operated with a sampling frequency of 250 MHz. In multichannel measurement systems, the light propagating through each sensor path produces a delay, which reduces the measurement accuracy. This can be solved by implementing a delay-correction technique, which utilizes the time difference between two spectra obtained by a bidirectional scan of the FDML laser. The system is demonstrated to exhibit multichannel sensing and high measurement time resolution of 9.9 µs, without being affected by the delay.

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Multichannel High-Speed Fiber Bragg Grating Interrogation System Utilizing a Field Programmable Gate Array

Cited by 7 publications

References 17 publications

High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

High-Speed Interrogation System for Fiber Bragg Gratings With Buffered Fourier Domain Mode-Locked Laser

Development of real‐time vibration measurement system by fiber Bragg gratings with pulse light

Field-Programmable Gate Array-Based Multichannel Measurement System for Interrogating Fiber Bragg Grating Sensors

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