Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators

Miguel, J. L. de; Galindo-Santos, Juan; Torres, C. Pulido de; Salgado, P. E. De Castro Faria; Velasco, Aitor V.; Corredera, Pedro

doi:10.3390/s18061895

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The spectral range of measurements with the use of matched filter systems is limited by the FWHM of the sensor and filter structures, as well as the spectral shift between them. The wavelength measurement range of commercially available interrogators is quite wide and reaches up to 100 nm [ 30 ]. In practice, the measurement of physical quantities such as temperature or strain is limited by the material properties of the optical fibers used to construct the sensor.…”

Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

“…FBG matched filter systems allow to obtain a frequency response of about 500 kHz and a wavelength resolution of 0.3 pm [ 16 ]. Commercial integrators achieve a maximum frequency of 5 kHz and typically 1 kHz [ 30 ]. In our case, as a result of repeated measurements, we achieved a relative resolution of 0.5 × 10 −3 , which in the case of a measuring range of 1.2 nm means a resolution of 0.6 pm and a temperature measurement resolution of 0.1 °C in the range from 10 °C to 120 °C.…”

Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

“…In our case, as a result of repeated measurements, we achieved a relative resolution of 0.5 × 10 −3 , which in the case of a measuring range of 1.2 nm means a resolution of 0.6 pm and a temperature measurement resolution of 0.1 °C in the range from 10 °C to 120 °C. The typical measurement resolution for a commercial interrogator is 0.5 pm [ 30 ]. Matched filter systems are also at least five times cheaper than commercially available interrogator systems.…”

Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

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Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Skorupski

Cięszczyk

Panas

et al. 2020

Sensors

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This article presents the effect of fiber Bragg gratings side lobes on interrogation systems consisting of sensor and matched filters. The conducted research shows that high-value side lobe structures applied as sensors and/or filters are characterized by some interesting properties. The paper presents both numerical analysis and experimental verification of the fiber Bragg gratings (FBG) interrogation systems with matched filters for gratings containing high side lobes. Numerical modeling of Bragg structures was performed for two different cases: uniform and inverse apodization. Modification of apodization can change the side lobe reflectance level even above levels found in uniform structures. This is a case not described in the literature, especially in terms of possible applications. Transfer characteristics, i.e., the relationship between power intensity as a function of wavelength shift, were determined. A collection of gratings with spectra corresponding to those analyzed in numerical experiments were fabricated. Next, the transfer characteristics of the interrogation systems containing real FBG were determined. The properties of the proposed systems are described. It has been shown that a significant level of sidebands, which is often the subject of many drawbacks in filtering or telecommunications systems, can be an advantage. It has been demonstrated that a high level of side lobes can be used to increase the measurement range of the FBG sensor interrogation systems. It has been determined numerically and confirmed experimentally that from the point of view of the design of sensor interrogation systems, it is beneficial to combine specific pairs of gratings: one with a spectrum characterized by a low side lobe level and a second one in which the spectrum has very high side lobes.

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Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

Section: Analysis Of the Obtained Results And Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Skorupski

Cięszczyk

Panas

et al. 2020

Sensors

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Photonic contact thermometry using silicon ring resonators and tuneable laser-based spectroscopy

Eisermann

Krenek

Winzer

et al. 2021

Tm - Technisches Messen

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Photonic sensors offer the possibility of purely optical measurement in contact thermometry. In this work, silicon-based ring resonators were used for this purpose. These can be manufactured with a high degree of reproducibility and uniformity due to the established semiconductor manufacturing process. For the precise characterisation of these photonic sensors, a measurement setup was developed which allows laser-based spectroscopy around 1550 nm and stable temperature control from 5 °C to 95 °C. This was characterised in detail and the resulting uncertainty influences of both the measuring set-up and the data processing were quantified. The determined temperature stability at 20 °C is better than 0.51 mK for the typical acquisition time of 10 s for a 100 nm spectrum. For a measurement of >24 h at 30 °C a standard deviation of 2.6 mK could be achieved. A hydrogen cyanide reference gas cell was used for traceable in-situ correction of the wavelength. The determined correction function has a typical uncertainty of 0.6 pm. The resonance peaks of the ring resonators showed a high optical quality of 157 000 in the average with a filter depth of up to 20 dB in the wavelength range from 1525 nm to 1565 nm. When comparing different methods for the determination of the central wavelength of the resonance peaks, an uncertainty of 0.3 pm could be identified. A temperature-dependent shift of the resonance peaks of approx. 72 pm/K was determined. This temperature sensitivity leads together with the analysed uncertainty contributions to a repeatability of better than 10 mK in the analysed temperature range from 10 °C to 90 °C.

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Optical Fibers in the Design and Fabrication of Smart Garments – a Review

Raji

Qin

et al. 2022

FIBRES & TEXTILES in Eastern Europe

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Several publications and even commercial products showcasing the application of optical fibers for textile goods abound in literature. Optical fibers can be employed as sensors by making use of physical principles to sense strain, temperature, and other quantities by tailoring the fiber such that the quantity to be measured alters the intensity, phase, polarisation, and wavelength of light within the fiber. However, a paper directed at the development of textile based applications or smart garments using optical fibers is lacking. This review seeks to serve as apt reference material for the development of optical fiber based textile sensors or smart garments with a focus on the application of plastic optical fibers (POFs). Highlighted are the salient material properties of POFs and their importance in delivering satisfactory sensing results. Special treatment has also been given to their proposed feasibility for embedment within weft knitted structures.

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Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators

Cited by 3 publications

References 24 publications

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Numerical and Experimental Analysis of Matched Filter Interrogation of FBG Sensors with Large Side Lobes

Photonic contact thermometry using silicon ring resonators and tuneable laser-based spectroscopy

Optical Fibers in the Design and Fabrication of Smart Garments – a Review

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