Simultaneous multi-point measurement of strain and temperature utilizing Fabry-Perot interferometric sensors composed of low reflective fiber Bragg gratings in a polarization-maintaining fiber

Bui, Quoc Hung; Wada, Atsushi; Fukushima, Koken; Nakaya, Koki; Soares, Manuel Guterres; Tanaka, Satoshi

doi:10.1364/oe.389844

Cited by 14 publications

(2 citation statements)

References 23 publications

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“…Fiber temperature sensors based on Bragg gratings or Brillouin have been researched widely [28][29][30][31]. However, previous research has been so far focused on the shift of the signal wavelength to present the temperature change by using the optical spectrum analyzer.…”

Section: Discussionmentioning

confidence: 99%

Numerical investigation of a real-time temperature sensor based on high-order soliton compression

et al. 2021

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Temperature sensors based on photonic crystal fibers (PCFs) have attracted considerable attentions due to their desirable advantages. However, the real-time temperature sensing in the temporal region is rarely studied. Here, an all-fiber real-time high-sensitivity temperature sensor is fabricated based on the high-order soliton compression process. A 1560 nm femtosecond fiber laser is used as the injected pulse source and the alcohol-filled silica PCF is adopted as the temperature sensitive device. Temperature sensing can be realized by detecting the peak values of temporal profiles with an oscilloscope at the change of temperature. The oscilloscope possesses faster response rate than the optical spectrum analyzer and can record the variation of the single pulse. Through numerical simulations, a real-time temperature sensor with the sensitivity of 4.91 W °C−1 is achieved at the fiber length of 21 cm. Our simulated results show that the designed temperature sensors with low cost, compact all-fiber structure and real-time response are competitive for application in temperature measurement devices.

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Section: Discussionmentioning

confidence: 99%

Numerical investigation of a real-time temperature sensor based on high-order soliton compression

et al. 2021

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“…[1][2][3][4][5] The use of light scattering, interference, modulation, and multicore fibers can improve the performance of optical fiber sensors. [6][7][8][9][10][11][12][13][14] The fiber Bragg grating (FBG) is a point-type strain and vibration optical sensor widely used in science and engineering because it is easier to manufacture and better adapts to various measurement conditions than other optical fiber sensors. 4,5 Structural health monitoring for qualitative damage assessment through acoustic imaging and high-speed measurement of vibrations exceeding several tens of kilohertz has been reported.…”

Section: Introductionmentioning

confidence: 99%

Real-time measurement system for overlapping reflection signals of fiber Bragg gratings using high-speed wavelength-swept laser

2022

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We propose a real-time measurement system that prevents overlapping reflection signals in fiber Bragg gratings (FBGs). The system combines a wavelength-swept laser using Fourier domain mode-locking (FDML) and a buffer stage with three optical paths to obtain a high-speed measurement rate of 304.2 kHz. Systems using high-speed wavelength-swept lasers are affected by the propagation time (delay) of the optical fiber. The delay causes problems such as inaccurate measurements, difficulty in distinguishing FBG reflection signals, and overlapping FBG reflection signals. To prevent these problems, we introduce a method for pulse modulation of a wavelength-swept laser by a fiber switch. This method allows for correction of delays by extracting and identifying only the reflection signal of the FBG at a specific wavelength. By identifying the reflection signals of all FBGs, the overlapping signals can be determined. Accordingly, we devise a measurement method that uses a fiber switch to shade light in the wavelength region of one FBG with overlapping signals from the wavelength-swept light of the laser. This method suppresses overlapping and allows only the reflection signal of the other FBGs to be extracted and demodulated. The proposed system uses bidirectional forward and backward scans with the wavelength-swept laser, such that the shaded FBG signals can be demodulated with either scanning direction. We demonstrate that the system using a threebuffered FDML laser can simultaneously measure the strain or vibration of FBGs installed at arbitrary distances.

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Investigating the effect of modulation depth of refractive index in cascaded FBGs for dual sensing of strain and temperature

Sahota,

Dhawan,

Gupta

2024

Opt Quant Electron

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Simultaneous multi-point measurement of strain and temperature utilizing Fabry-Perot interferometric sensors composed of low reflective fiber Bragg gratings in a polarization-maintaining fiber

Cited by 14 publications

References 23 publications

Numerical investigation of a real-time temperature sensor based on high-order soliton compression

Numerical investigation of a real-time temperature sensor based on high-order soliton compression

Real-time measurement system for overlapping reflection signals of fiber Bragg gratings using high-speed wavelength-swept laser

Investigating the effect of modulation depth of refractive index in cascaded FBGs for dual sensing of strain and temperature

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