Abstract
In this paper, we have proposed a Bragg grating based sensor to monitor health of civil structures at distinct temperatures. We have considered increased number of gratings with suitable refractive index to enhance sensitivity of fiber Bragg grating sensor. Analysis of Bragg wavelength with respect to load and temperature is successfully studied. The simulation results reveal that when independently strain (50 units per simulation) and temperature (25 °C) are increased uniformly, a linear shift in Bragg wavelength 0.064 and 0.347 nm is observed, respectively. Similarly, when both strain and temperature are increased (ε = 50 & T = 25 °C) concurrently, a directly proportional relation is found in Bragg wavelength (0.403 nm). The results verify the enhanced performance of as-proposed sensor, employing it could be potentially used in civil, bio-medical and military domains.
Highlights
To monitor health of massive structures/infrastructures, vibrational and environmental parameters, the fiber optic sensors are extensively used
The estimation from an Fiber bragg gratings (FBGs) might be joined with that of an alternate detecting method, for example, utilizing cross hybrid FBG/long period fiber grinding (LPG) [9], superstructure FBG [10], an inspected FBG joined with an LPG [11] and an FBG joined with a polarizationkeeping up loop mirror [12]
The fiber bragg grating sensors provides information in wavelength encoded form, i.e. when strain is applied to the fiber bragg gratings, it causes shift in the bragg wavelength of the FBG spectral
Summary
To monitor health of massive structures/infrastructures, vibrational and environmental parameters, the fiber optic sensors are extensively used. Among all the optic sensors, fiber bragg grating sensors are the best for this purpose [1]. These fiber optic sensors are normally made by distinguishing two physical parameters which have different sensitivities to temperature and strain [2], [3]. Fiber bragg gratings (FBGs) have been of awesome enthusiasm for optical detecting innovation on the grounds that they are cost-effective, compact and small in size, simple to fabricate, able to withstand with harsh conditions and their optical spectra have great linear responses as for different values of temperature and strain. The estimation from an FBG might be joined with that of an alternate detecting method, for example, utilizing cross hybrid FBG/long period fiber grinding (LPG) [9], superstructure FBG [10], an inspected FBG joined with an LPG [11] and an FBG joined with a polarizationkeeping up loop mirror [12]
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