A simple FBG sensor for strain–temperature discrimination

Parne, Saidi Reddy; Prasad, R. L. N. Sai; Gupta, D. Sen; Shankar, M. Sai; Srimannarayana, K.; Tiwari, Umesh; Mishra, Vandana

doi:10.1002/mop.25901

Cited by 10 publications

(5 citation statements)

References 22 publications

(16 reference statements)

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“…The distribution of the refractive index of the grating core characterizing the Bragg grating is a function: (2) where: no is the average value of the refractive index, neff is the amplitude of variation of the refractive index, (z) describes the grating chirp.…”

Section: Methods Of Reconstructing the Strain Distribution And Temper...mentioning

confidence: 99%

“…The processing equation of a multi-parameter sensor written in matrix form, with the sensitivities of the measured quantities determined for different wavelengths or for different modes of light, allows the measured quantities to be reconstructed by calculating the inverse sensitivity matrix, subject to the condition that the determinant of the sensitivity matrix has a value different from zero. The most common two quantities measured simultaneously are strain and temperature [1,2], refractive index and temperature [3], fluid level and temperature [4], and force and temperature [5]. The most commonly simultaneously measured three quantities are torsion, strain and temperature [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

International Journal of Electronics and Telecommunications

Detka,

Kaczmarek

2022

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This paper presents a simulation study of the simultaneous reconstruction of the non-smooth strain distribution of an optical fiber Bragg grating and its temperature, which is based on the reflection spectrum of the reflected beam of the grating. The transition matrix method was used to model the reflection spectrum of the grating, and the nonlinear Nelder-Mead optimization method was used to simultaneously reconstruct the strain distribution along the grating and its temperature. The results of simulations of simultaneous reconstruction of the strain profile and temperature indicate good accord with the strain profiles and temperature set. The reconstruction errors of the strain profiles are less than 1.2 percent and the temperature change errors are less than 0.2 percent, with a noise level of 5 percent.

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Section: Methods Of Reconstructing the Strain Distribution And Temper...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

International Journal of Electronics and Telecommunications

Detka,

Kaczmarek

2022

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“…A half-encapsulated FBG sensor is easy to fabricate, and can reduce the complexity and cost of the system. PARNE SAIDI REDDY et al [20] proposed a simple sensor using half the length of a 3-cm fiber Bragg grating embedded on a cantilever for the simultaneous measurement and discrimination of strain and temperature. When the strain is increased, the shift also increases accordingly; thereby, the reflected spectrum from the sensor shows two peaks, one remains constant, whereas the other shifts according to the applied strain.…”

Section: Introductionmentioning

confidence: 99%

Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

Li¹,

Zhang²,

Song³

et al. 2021

Optica Applicata

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A novel technology for the simultaneous and independent measurement of dual parameters is proposed and experimented. By using a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing conditions, the sensor structure is designed such that the reflective single-peak spectrum splits into a twin-peak spectrum, which makes the FBG spectrum form a natural spectral peak splitting bias. A measurement limitation exists in the FBG sensor packaging at room temperature, which can be solved by the high-temperature cured packaging method. To verify the validity of the theory and methodology, the experimental system is used. In the range from –1000 to +1000 με and from 35 to 75°C, the Bragg wavelength change is relative linear to the strain and temperature. The temperature and strain variations can be independently and simultaneously measured using the split peak, and the deviations of the FBG sensor are ±1°C and ±5 με, respectively. This single FBG sensor can realize dual-parameter measurement, which is valuable for narrow-space health monitoring.

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“…The Bragg wavelength is directly dependent on both the strain and temperature as shown in Equation (2), ∆λBλB=(α+ξ)∆T+(1−ρe)ε where ∆ T is the temperature change experienced at the FBG sensor location, α is the thermal expansion, ξ is the thermo-optic coefficient, ε is the longitudinal strain on the FBG and ρ e is the effective photo-elastic constant of the fibre core material [4]. Hence strain and/or temperature can be measured by monitoring the reflected Bragg wavelength and the strain and temperature contributions can be de-coupled from one another by using a variety of techniques [5,6]. Most FBG sensors are designed to suit interrogation devices which are widely available at low cost in the telecommunications C-Band wavelength range (1530–1565 nm) with a typical strain sensitivity of approximately 1.2 pm/microstrain (µε) and 10 pm/°C [7].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

Zhang

Davis

Chiu

et al. 2019

Sensors

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Although fibre Bragg gratings (FBGs) offer obvious potential for use in high-density, high-strain sensing applications, the adoption of this technology in the historically conservative aerospace industry has been slow. There are several contributing factors, one of which is variability in the reported performance of these sensors in harsh and fatigue prone environments. This paper reports on a comparative evaluation of the fatigue performance of FBG sensors written according to the same specifications using three different grating manufacturing processes: sensors written in stripped and re-coated fibres, sensors written during the fibre draw process and sensors written through fibre coating. Fatigue cycling of the fibres is provided by a customized electro-dynamically actuated loading assembly designed to provide high frequency and amplitude loading. Pre- and post-fatigue microscopic analysis and high-resolution transmission and reflection spectra scanning are conducted to investigate the fatigue performance of FBGs, the failure regions of fibres as well as any fatigue-related effects on the spectral profiles. It was found that because of the unique fabrication method, the sensors written through the fibre coating, also known as trans-jacket FBGs, show better fatigue performance than stripped and re-coated FBGs with greater control possible to tailor the optical reflection properties compared to gratings written in the draw tower. This emerging method for inscription of Type I gratings opens up the potential for mass production of higher reflectivity, apodised sensors with dense or complex array architectures which can be adopted as sensors for harsh environments such as in defence and aerospace industries.

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A simple FBG sensor for strain–temperature discrimination

Cited by 10 publications

References 22 publications

International Journal of Electronics and Telecommunications

International Journal of Electronics and Telecommunications

Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

Fatigue Performance of Type I Fibre Bragg Grating Strain Sensors

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