Abstract
In this article, a method to improve refractive index (RI) sensitivity of single‐mode–no core–single‐mode fiber (SNS) sensor structure is addressed by optimization of geometric parameters of no-core fiber (NCF), which could be used to accurately measure the irreversible deformation of the battery expansion state caused by temperature change. From the perspective of temperature changing RI of the electrolyte solution, the impacts of diameter, length, and waveband on the performance of the fiber sensor have been discussed as RI measurement range is 1.340–1.390. After optimization, RI sensitivity can reach approximately 2,252.7 and 2037.3 nm/RIU with the length of 6.55 and 6.75 mm when the RI is from 1.380 to 1.390.
Highlights
Optical fiber sensor is widely applied in industry, medical treatment, energy storage, aerospace, and other fields for sensing measurement due to its anti-electromagnetic interference, small size, easy access, etc
Single-mode–multimode–single-mode fiber (SMS) structure based on multimode interference (MMI) has been used for strain (May-Arrioja et al, 2016; Zhou et al, 2008), temperature (Tripathi et al, 2009; Su et al, 2014; Han et al, 2014; Zhang et al, 2013; Li et al, 2006), humidity (An et al, 2014), and refractive index (RI) (Zhao et al, 2015; Zhang et al, 2020; Zhao et al, 2014) measurement in harsh environment
The geometric parameters of the waveguide structure based on MMI and RI measurement range have a great effect on sensing sensitivity (Qiang et al, 2011)
Summary
Optical fiber sensor is widely applied in industry, medical treatment, energy storage, aerospace, and other fields for sensing measurement due to its anti-electromagnetic interference, small size, easy access, etc. Single-mode–multimode–single-mode fiber (SMS) structure based on multimode interference (MMI) has been used for strain (May-Arrioja et al, 2016; Zhou et al, 2008), temperature (Tripathi et al, 2009; Su et al, 2014; Han et al, 2014; Zhang et al, 2013; Li et al, 2006), humidity (An et al, 2014), and RI (Zhao et al, 2015; Zhang et al, 2020; Zhao et al, 2014) measurement in harsh environment. The geometric parameters of the waveguide structure based on MMI and RI measurement range have a great effect on sensing sensitivity (Qiang et al, 2011). It illustrates again that RI sensitivity of SNS structure can be improved by optimizing NCF’s geometric parameters
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