Tilted fiber Bragg grating design for a simultaneous measurement of temperature and strain

Kipriksiz, Selin Ece; Yücel, Murat

doi:10.1007/s11082-020-02609-w

Cited by 16 publications

(12 citation statements)

References 17 publications

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“…Tilted fibre Bragg gratings (TFBG) are structures with a characteristic transmission spectrum containing several dozen resonances creating a dense comb of cladding modes. Such gratings are sensitive to temperature [ 1 ], stress [ 2 ], bending [ 3 ] and external refractive index [ 4 , 5 ]. Their main application is the measurement of the surrounding refractive index (SRI) which is associated with a significant modification of the cladding mode comb.…”

Section: Introductionmentioning

confidence: 99%

Single- and Double-Comb Tilted Fibre Bragg Grating Refractive Index Demodulation Methods with Fourier Transform Pre-Processing

Cięszczyk

Skorupski

Panas

2022

Sensors

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The development of fibre optic sensors for measuring the refractive index is related to the creation of new periodic structures and demodulation algorithms for the measured spectrum. Recently, we proposed a double-comb Tilted fibre Bragg grating (DCTFBG) structure. In this article, we analyse such a structure for measuring the refractive index in comparison to a single classical structure. Increasing the number of modes causes a significant change in the Fourier spectrum of optical spectra. For the purpose of data pre-processing, we propose the Fourier Transform as a filtering method in the frequency domain. Then, we analyse separately the band-filtered optical spectra for several frequency ranges. For quantitative analysis, we use algorithms that use quantitative changes in the transmission, i.e., the method of the envelope and the length of the spectrum contour. We propose the use of the Hilbert transform as the envelope method. The second type of algorithms used are methods determining the shift of spectrum features along the wavelength axis. The method of determining the centre of gravity of the area bounded by the envelope and the maximum of the second derivative of the smoothed cumulative spectrum contour length is proposed here. Using the developed methods, the measurement resolution was achieved at the level of 2 × 10−5 refractive index unit.

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Section: Introductionmentioning

confidence: 99%

Single- and Double-Comb Tilted Fibre Bragg Grating Refractive Index Demodulation Methods with Fourier Transform Pre-Processing

Cięszczyk

Skorupski

Panas

2022

Sensors

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“…In practical application, it is a pressing problem to eliminate the cross sensitivity between temperature and strain [8][9][10]. The current solutions include reference to fiber gratings [11][12][13], the combination of different gratings [14][15][16][17][18], the fusion of fiber gratings with different cladding diameters [19][20][21], chirped fiber gratings [22], Fabry-Perot (FP)cavities [23][24][25][26], and microstructured fiber gratings [27][28][29][30]. Among these methods, referring to fiber gratings requires that the two gratings must have identical structures and parameters, raising higher requirements for fabricating.…”

Section: Introductionmentioning

confidence: 99%

A spatially non-overlapping dual-wavelength 2D FBG for the measurement of temperature and strain

Che

Wang

et al. 2022

Front. Phys.

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This work designed a dual-wavelength 2D fiber Bragg grating (FBG) engraved on the single-mode fiber to measure the temperature and strain. The FBG is composed of two sub-gratings that are not overlapped spatially at the same location of the fiber core. Experiments showed that the temperature and strain sensitivities of this grating were separately measured to be 10.64 p.m./°C and 0.882,731 p.m./μɛ at the central wavelength of 1,548 nm, and 10.74 p.m./°C and 0.916,080 p.m./μɛ at the central wavelength of 1,550 nm. These coefficients constitute a coefficient matrix that can solve the problem of cross sensitivity between temperature and strain, which has been verified by varying central wavelengths caused by the synchronous change of temperature and strain.

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“…Another method that implements the use of two gratings is that the gratings are fixed in the stretched and compressed zones of the sensor, in this case the difference in wave shifts does not depend on temperature [5,6]. There are also many techniques that do not require maintaining a special mechanical state of one of the gratings [7][8][9][10][11][12][13]. These methods use not only a shift of the grating spectrum, but also a change in the shape of this spectrum or changes in the amplitudes of parts of the spectrum.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the nonlinear dependence of the indications of a fiber Bragg grating on temperature and strain from experimental data

Shestakov

Шардаков

Yepin

et al. 2022

Frattura Ed Integrità Strutturale

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The readings of the Bragg grating are determined based on the optical radiation reflected from it. A quantitative characteristic of this radiation is the wavelength at which the maximum power of the optical signal is achieved. This characteristic is called the central wavelength of the grating. The central wavelength shift depends on temperature and strain. As a rule, a linear approximation of this dependence is used. However, from the available literature it is known that, the grating wavelength shift demonstrates a strong nonlinear dependence on temperature at 5<T<200K and a weak quadratic dependence close to room temperature. Thus far, the authors have not found studies that consider all terms in the quadratic expansion of the central wavelength of the Bragg grating as a function of temperature and strain at near-room temperatures. Our work is intended to fill this gap. The article describes an experiment in which an optical fiber with Bragg grating was subjected to loading using three different weights. A step-wise temperature change from 5 to 100 0С was realized for each weight. Based on these data, all terms of the quadratic expansion of the desired function are determined. The contribution of each term is estimated.

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Tilted fiber Bragg grating design for a simultaneous measurement of temperature and strain

Cited by 16 publications

References 17 publications

Single- and Double-Comb Tilted Fibre Bragg Grating Refractive Index Demodulation Methods with Fourier Transform Pre-Processing

Single- and Double-Comb Tilted Fibre Bragg Grating Refractive Index Demodulation Methods with Fourier Transform Pre-Processing

A spatially non-overlapping dual-wavelength 2D FBG for the measurement of temperature and strain

Estimation of the nonlinear dependence of the indications of a fiber Bragg grating on temperature and strain from experimental data

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