A Novel Simple TFBG Spectrum Demodulation Method for RI Quantification

Cięszczyk, S.; Harasim, Damian; Kisała, Piotr

doi:10.1109/lpt.2017.2768601

Cited by 30 publications

(14 citation statements)

References 12 publications

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“…Then, using calibration measurements, the relationship between the extracted parameters and the SRI is determined. Based on the literature, the existing methods of spectrum demodulation can be divided as follows: Determination of the wavelength shifts of individual cladding modes [6];Determination of the cut-off length of the cladding modes [7,8,9,10];Determination of the parameters of transmission spectrum changes in the range of cladding modes [11,12,13]. …”

Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

“…Determination of the parameters of transmission spectrum changes in the range of cladding modes [11,12,13].…”

Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

“…Recently, the use of a parameter of the spectral contour length in the spectral range of the cladding modes for the determination of the SRI has been proposed [12]. It is the simplest parameter possible, because it does not require the calculation of spectral peaks or the smoothing and averaging of filters.…”

Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

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New Parameters Extracted from Tilted Fiber Bragg Grating Spectra for the Determination of the Refractive Index and Cut-Off Wavelength

Cięszczyk

Kisała

Mroczka

2019

Sensors

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Tilted fiber Bragg grating (TFBG) is a very popular fiber optic element that is used as a sensor for various physical quantities. The calculation of the refractive index of a substance surrounding the TFBG is based on its spectrum demodulation, which consists of determining a certain parameter that is correlated with the sought quantity. The most commonly used parameter is the area created by the maxima and minima of the cladding mode resonances. In this article, we propose a new group of methods, which are based on calculating the parameters related to the spectrum differences between the local average values in the range of occurrence of the cladding modes. The basic parameter used in this group of methods is the mean absolute deviation from the local mean, which is characterized by the best linearity among the considered group of methods. The calculated parameters, in their cumulative form, can also be used to determine the cut-off wavelength, which can also indirectly indicate the refractive index value. The proposed approaches were compared, in terms of measurement resolution, to the most commonly used methods, such as the cladding modes’ envelope area and the spectral contour lengths.

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Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

“…Determination of the parameters of transmission spectrum changes in the range of cladding modes [11,12,13].…”

Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

Section: Methods For Sri Determination Based On Tfbg Spectrum Analmentioning

confidence: 99%

See 1 more Smart Citation

New Parameters Extracted from Tilted Fiber Bragg Grating Spectra for the Determination of the Refractive Index and Cut-Off Wavelength

Cięszczyk

Kisała

Mroczka

2019

Sensors

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“…This is possible, as part of the light continues to be irradiated externally, while some cladding modes return to be reflected internally towards the OF core where they are coupled [11]. Previous work that studied the TFBG sensor as a refractometer [3,12,[20][21][22], did not take this RI range into account during their analysis. In some monitoring applications [4], the TFBG sensor is defined as not able to detect the resin's RI due to the lower RI of the OF.…”

Section: Stability Of the α-Shape Modified Delaunay Demodulation Techniquementioning

confidence: 99%

Refractometric Properties of a TFBG Sensor Demodulated Using α-Shape Modified Delaunay Triangulation

Fazzi

Groves

2021

Optics

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In our previous research, a novel demodulation technique based on α-shape Delaunay triangulation (D-T) was developed to obtain the refractive index of the medium surrounding the optical fibre using the envelope of the cladding peaks from the spectrum of the tilted fibre Bragg grating (TFBG) sensor. This technique was demonstrated to be efficient, easy to implement, powerful, faster than the previous ones and applicable for real-time measurements. In this paper, a deep parametric analysis of the resolution, repeatability and accuracy of the D-T demodulation technique for a TFBG refractometer sensor is performed and presented. The spectral properties of the TFBG sensor as a refractometer are explored using the same demodulation technique. Specifically, supposing the use of the TFBG as a two-parameter optical sensor, the influence of the strain on the envelope area is analysed, and the measurement stability regarding the external RI is reported. Then, the cladding resonance peaks in the spectrum are observed experimentally as the TFBG undergoes partial immersion in a defined refractive index liquid. This last experiment allowed a better understanding the evolution of the TFBG transmission spectrum when the Bragg gratings were partially surrounded by a medium with a different RI.

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“…Fiber Bragg grating (FBG) sensors can be used to measure many physical quantities, such as strain, stress, elongation, temperature [ 1 ], and refractive index [ 2 ]. The advantage of optical method based research is the lack of influence on the tested object, the ability to perform non-invasive measurements which can be performed in a wide variety of fields such as mechanical structures diagnostics or even medicine [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Overhead Transmission Line Sag Estimation Using a Simple Optomechanical System with Chirped Fiber Bragg Gratings. Part 1: Preliminary Measurements

Wydra

Kisała

Harasim

et al. 2018

Sensors

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A method of measuring the power line wire sag using optical sensors that are insensitive to high electromagnetic fields was proposed. The advantage of this technique is that it is a non-invasive measurement of power line wire elongation using a unique optomechanical system. The proposed method replaces the sag of the power line wire with an extension of the control sample and then an expansion of the attached chirped fiber Bragg grating. This paper presents the results of the first measurements made on real aluminum-conducting steel-reinforced wire, frequently used for power line construction. It has been shown that the proper selection of the CFBG (chirped fiber Bragg grating) transducer and the appropriate choice of optical parameters of such a sensor will allow for high sensitivity of the line wire elongation and sag while reducing the sensitivity to the temperature. It has been shown that with a simple optomechanical system, a non-invasive measurement of the power line wire sag that is insensitive to temperature changes and the influence of high electromagnetic fields can be achieved.

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A Novel Simple TFBG Spectrum Demodulation Method for RI Quantification

Cited by 30 publications

References 12 publications

New Parameters Extracted from Tilted Fiber Bragg Grating Spectra for the Determination of the Refractive Index and Cut-Off Wavelength

New Parameters Extracted from Tilted Fiber Bragg Grating Spectra for the Determination of the Refractive Index and Cut-Off Wavelength

Refractometric Properties of a TFBG Sensor Demodulated Using α-Shape Modified Delaunay Triangulation

Overhead Transmission Line Sag Estimation Using a Simple Optomechanical System with Chirped Fiber Bragg Gratings. Part 1: Preliminary Measurements

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