Theoretical Study and Optimization of Apodized Fiber Bragg Grating for Single and Quasi-distributed Structural Health Monitoring Applications

Dwivedi, Krishna Mohan; Trivedi, Gaurav; Khijwania, Sunil K.

doi:10.1109/radioelektronika49387.2020.9092399

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…Yet this process can be observed for specific grating lengths, and then again, by increasing the grating length even further, SLS starts to decrease again (function is periodical). We can see similar tendencies in a scientific article [16], where a higher modulation index of 4 × 10 −4 is used and well seen when the SLS function is periodical. The lowest SLS values are recorded for uniform FBG (without apodization) where they do not reach the defined threshold (20 dB); thus, we can state that it is not most suitable for FBG sensor networks and long-distance monitoring applications.…”

Section: Resultssupporting

confidence: 66%

Designing of Fiber Bragg Gratings for Long-Distance Optical Fiber Sensing Networks

Braunfelds

Haritonovs

Seņkāns

et al. 2022

Modelling and Simulation in Engineering

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Most optical sensors on the market are optical fiber Bragg grating (FBG) sensors with low reflectivity (typically 7-40%) and low side-lobe suppression (SLS) ratio (typically SLS <15 dB), which prevents these sensors from being effectively used for long-distance remote monitoring and sensor network solutions. This research is based on designing the optimal grating structure of FBG sensors and estimating their optimal apodization parameters necessary for sensor networks and long-distance monitoring solutions. Gaussian, sine, and raised sine apodizations are studied to achieve the main requirements, which are maximally high reflectivity (at least 90%) and side-lobe suppression (at least 20 dB), as well as maximally narrow bandwidth (FWHM<0.2 nm) and FBGs with uniform (without apodization). Results gathered in this research propose high-efficiency FBG grating apodizations, which can be further physically realized for optical sensor networks and long-distance (at least 40 km) monitoring solutions.

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Section: Resultssupporting

confidence: 66%

Designing of Fiber Bragg Gratings for Long-Distance Optical Fiber Sensing Networks

Braunfelds

Haritonovs

Seņkāns

et al. 2022

Modelling and Simulation in Engineering

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“…The apodization functions considered for comparison of performance evaluation are listed in this section. Apodization functions are chosen from the literature [15][16][17][18][19][20][21].…”

Section: Existing Apodization Functionsmentioning

confidence: 99%

“…Apodization is the technique that can be applied to reduce or eliminate these side lobes. Various articles [15][16][17][18][19][20][21][22][23] suggested implementing the existing functions or proposed novel apodization functions for the improvement of sensing characteristics, strain and temperature measurement, dispersion compensation, structural health monitoring, etc. In a few literatures, sensitivity enhancement has been achieved by using coating materials [24,25].…”

Section: Introductionmentioning

confidence: 99%

Novel Apodized Fiber Bragg Grating Applied for Medical Sensors: Performance Investigation

Arumugam¹,

Kumar²,

Dhanalakshmi³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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Sensors play an important role in shaping and monitoring human health. Exploration of methods to use Fiber Bragg Grating (FBG) with enhanced sensitivity has attracted great interest in the field of medical research. In this paper, a novel apodization function is proposed and performance evaluation and optimization of the same have been made. A comparison was conducted between various existing apodization functions and the proposed one based on optical characteristics and sensor parameters. The results evince the implementation of the proposed apodization function for vital sign measurement. The optical characteristics considered for evaluation are Peak Resonance Reflectivity level, Side Lobes Reflectivity level and Full Width Half Maximum (FWHM). The proposed novel apodization novel function has better FWHM, which is narrower than the FWHM of uniform FBG. Sensor characteristics like a quality parameter, detection accuracy and sensitivity also show improvement. The proposed novel apodization function is demonstrated to have a better shift in wavelength in terms of temperature and pulse measurement than the existing functions. The sensitivity of the proposed apodized function is enhanced with a Poly-dimethylsiloxane coating of varying thickness, which is 6 times and 5.14 times greater than uniform Fiber Bragg grating and FBG with the proposed novel apodization function, respectively, enhancing its utilization in the field of medicine.

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Section: Determination Of the Most Appropriate Parameters Of Fiber Br...mentioning

confidence: 99%

“…The research articles [70] and [71] report on the research wherein mathematical simulation software was used in modelling FBG gratings for sensor network solutions. The research in [70] has achieved the most appropriate grating parameters in terms of bandwidth (0.13 nm) and SLS (34 dB), but with reflectivity of just 53 %. In turn, the research in [71] has achieved the most appropriate grating parameters in terms of reflectivity (99.9 %) and SLS (95.6 dB), but with high FWHM of 0.434 nm.…”

Section: Determination Of the Most Appropriate Parameters Of Fiber Br...mentioning

confidence: 99%

Development of the Multifunctional Fiber Optical Sensing System and its Application in Monitoring Solutions

Braunfelds¹

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The number of sites and territories in Latvia and across the world that need different kinds of real-time health monitoring (roads, bridges, dams, railways, buildings, and other structures) is constantly growing. Since monitoring often should be conducted at long distances across many locations simultaneously, in corrosive environments under electromagnetic interference or in environments without power supply, FBG can be applied in such types of monitoring. The aim of the Doctoral Thesis is to integrate an optical FBG sensor network in optical fiber communication systems and to evaluate application of FBG sensors in real-time road monitoring solutions.

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Theoretical Study and Optimization of Apodized Fiber Bragg Grating for Single and Quasi-distributed Structural Health Monitoring Applications

Cited by 12 publications

References 24 publications

Designing of Fiber Bragg Gratings for Long-Distance Optical Fiber Sensing Networks

Designing of Fiber Bragg Gratings for Long-Distance Optical Fiber Sensing Networks

Novel Apodized Fiber Bragg Grating Applied for Medical Sensors: Performance Investigation

Development of the Multifunctional Fiber Optical Sensing System and its Application in Monitoring Solutions

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