Accuracy improvement in peak positioning of spectrally distorted fiber Bragg grating sensors by Gaussian curve fitting

Lee, Hyun‐Wook; Park, Hyoung-Jun; Lee, June-Ho; Song, Minho

doi:10.1364/ao.46.002205

Cited by 39 publications

(19 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The comparison is given by the coefficient of determination or R 2 value. The Bragg peak was identified using a traditional Gaussian fitting algorithm [31]. Figure 11(a) indicates that in the first 400 hours of exposure -when the SNR is still highthe R 2 value is larger than 90%.…”

Section: A Snr Evaluation In Reactor Environmentmentioning

confidence: 99%

“…We therefore compared several common and less common algorithms to try to improve the useful sensor time. Figure 10 compares a maximum detection, a quadratic and cubic interpolation, a Gaussian fit [31], a centroid approximation and a phase [34], [35] and cross correlation [36] technique. The horizontal axis is the time given in hours while the vertical axis gives the Bragg wavelength in arbitrary units.…”

Section: B Improvement Of Sensor Useful Timementioning

confidence: 99%

See 1 more Smart Citation

Signal-to-Noise Ratio Evaluation of Fibre Bragg Gratings for Dynamic Strain Sensing at Elevated Temperatures in a Liquid Metal Environment

Pauw¹,

Lamberti

Rezayat

et al. 2015

J. Lightwave Technol.

View full text Add to dashboard Cite

Vibration measurements of the fuel assembly of a nuclear reactor are a very useful tool to determine the health and lifetime of the reactor core. The importance of these measurements is exacerbated in the new generation of heavy liquid metal reactors, where the fuel assembly is exposed to a corrosive molten metal coolant at 300 • C and where the space between the individual fuel pins is limited to a few millimeters. In this paper we consider fibre Bragg gratings as potential candidates for carrying out fuel pin vibration measurements in such an environment. We describe a dedicated method to integrate fibre Bragg gratings in a fuel pin and we subject this pin to conditions close to those encountered in a real heavy liquid metal reactor. More specifically, we report on the performance of draw tower gratings used as a vibration sensor when the fuel pins are immersed in heavy liquid metal at 300 • C for up to 700 hours. The performance evaluation is based on monitoring the signalto-noise ratio of the grating's spectral response as a function of time. We show that accurate detection of the Bragg peak becomes very challenging after 400 hours of exposure. Additionally, we succeed to extend the useful lifetime with a factor of two by using an appropriate integration of the fiber in the fuel pin and by using an alternate peak detection algorithm.

show abstract

Section: A Snr Evaluation In Reactor Environmentmentioning

confidence: 99%

Section: B Improvement Of Sensor Useful Timementioning

confidence: 99%

Signal-to-Noise Ratio Evaluation of Fibre Bragg Gratings for Dynamic Strain Sensing at Elevated Temperatures in a Liquid Metal Environment

Pauw¹,

Lamberti

Rezayat

et al. 2015

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

“…Any void or non-uniform shrinkage of the epoxy consequently induces non-uniform strain on the FBG and causes substantial distortion like occurrence of ripples in the corresponding wavelength spectra and/or broadening of FBG spectra and this leads to increased system noise and false measurements with the requirement of special techniques to demodulate the sensor signal [9]. Imperfect bonding may also affect the strain transfer characteristics from the host to the sensor.…”

Section: Introductionmentioning

confidence: 99%

Investigation on packages of fiber Bragg grating for use as embeddable strain sensor in concrete structure

Biswas

Bandyopadhyay

Kesavan

et al. 2010

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

“…From Chapter 3, a FBG sensor spectrum can be approximated as a Gaussian function [66,67]. Therefore, in this particular experiment, we applied a Gaussian curve fit to each strain related scanned traces.…”

Section: Fbg Sensor Interrogation Using Time Interval Methodsmentioning

confidence: 99%

“…3.15 will be an approximation of the wavelength domain spectrum. From here, there are several signal processing techniques to post-process the scanned spectrum in order to detect the center wavelength of optical sensors, such as: detecting the peak or maximum, the centroid approach, applying the cross-correlation method and applying polynomial or Gaussian curve fitting algorithms [66,67].…”

Section: Theoretical Analysis Of Scanning and Zero-crossing Detectionmentioning

confidence: 99%

Silicon Photonic Device for Wavelength Sensing and Monitoring

López¹,

German²

View full text Add to dashboard Cite

However, other fields of research such as optical sensor processing can benefit from silicon photonics technology, specially in sensors where the physical measurement is wavelength encoded.In this research work, we present a design and application of a thermally tuned silicon photonic device as an optical sensor interrogator.The main device is a micro-ring resonator filter of 10 µm of diameter. A photonic design toolkit was developed based on open source software from the research community. With those tools it was possible to estimate the resonance and spectral characteristics of the filter. From the obtained design parameters, a 7.8 x 3.8 mm optical chip was fabricated using standard micro-photonics techniques. In order to tune a ring resonance, Nichrome micro-heaters were fabricated on top of the device. Some fabricated devices were systematically characterized and their tuning response were determined. From measurements, vi a ring resonator with a free-spectral-range of 18.4 nm and with a bandwidth of 0.14 nm was obtained. Using just 5 mA it was possible to tune the device resonance up to 3 nm.In order to apply our device as a sensor interrogator in this research, a model of wavelength estimation using time interval between peaks measurement technique was developed and simulations were carried out to assess its performance. To test the technique, an experiment using a Fiber Bragg grating optical sensor was set, and estimations of the wavelength shift of this sensor due to axial strains yield an error within 22 pm compared to measurements from spectrum analyzer.Results from this study implies that signals from FBG sensors can be processed with good accuracy using a micro-ring device with the advantage of ts compact size, scalability and versatility. Additionally, the system also has additional applications such as processing optical wavelength shifts from integrated photonic sensors and to be able to track resonances from laser sources.

show abstract

Accuracy improvement in peak positioning of spectrally distorted fiber Bragg grating sensors by Gaussian curve fitting

Cited by 39 publications

References 6 publications

Signal-to-Noise Ratio Evaluation of Fibre Bragg Gratings for Dynamic Strain Sensing at Elevated Temperatures in a Liquid Metal Environment

Signal-to-Noise Ratio Evaluation of Fibre Bragg Gratings for Dynamic Strain Sensing at Elevated Temperatures in a Liquid Metal Environment

Investigation on packages of fiber Bragg grating for use as embeddable strain sensor in concrete structure

Silicon Photonic Device for Wavelength Sensing and Monitoring

Contact Info

Product

Resources

About