scholarly journals Ultrafast and High Resolution Crack Detection Using Fully Distributed Chirped Fiber Bragg Grating Sensors

2016 ◽  
Author(s):  
Dejun Feng ◽  
Eamonn J. Ahmad ◽  
Chao Wang
Keyword(s):  
High Resolution ◽  
Fiber Bragg Grating ◽  
Crack Detection ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Chirped Fiber Bragg Grating

scholarly journals Shallow-Tapered Chirped Fiber Bragg Grating Sensors for Dual Refractive Index and Temperature Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3635
Author(s):  
Takhmina Ayupova ◽  
Madina Shaimerdenova ◽  
Daniele Tosi
Keyword(s):  
Refractive Index ◽  
Spectral Analysis ◽  
Fiber Bragg Grating ◽  
Thermal Characteristics ◽  
Temperature Sensing ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Thermal Changes ◽  
Chirped Fiber Bragg Grating

In this work, we present a gold-coated shallow-tapered chirped fiber Bragg grating (stCFBG) for dual refractive index (RI) and temperature sensing. The stCFBG has been fabricated on a 15-mm long chirped FBG, by tapering a 7.29-mm region with a waist of 39 μm. The spectral analysis shows two distinct regions: a pre-taper region, in which the stCFBG is RI-independent and can be used to detect thermal changes, and a post-taper region, in which the reflectivity increases significantly when the RI increments. We estimate the RI and thermal sensitivities as 382.83 dB/RIU and 9.893 pm/°C, respectively. The cross-talk values are low (−1.54 × 10−3 dB/°C and 568.1 pm/RIU), which allows an almost ideal separation between RI and thermal characteristics. The stCFBG is a compact probe, suitable for long-term and temperature-compensated biosensing and detection of chemical analytes.

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