AI Article Synopsis
- Optical fiber sensors using interferometer structures are essential for monitoring various parameters in natural environments, but high-sensitivity measurements still face challenges.
- The paper summarizes methods for enhancing sensitivity in these sensors, focusing on the derivation of sensing principles and applications.
- Using the modal coupling interferometer as an example, it discusses five key factors affecting sensitivity and reviews relevant literature on their modulation for improved performance.
Article Abstract
Optical fiber sensors based on an interferometer structure play a significant role in monitoring physical, chemical, and biological parameters in natural environments. However, sensors with high-sensitivity measurement still present their own challenges. This paper deduces and summarizes the methods of sensitivity enhancement in interferometer based fiber optical sensors, including the derivation of the sensing principles, key characteristics, and recently-reported applications.The modal coupling interferometer is taken as an example to derive the five terms related to the sensitivity: (1) the wavelength-dependent difference of phase between two modes/arms ∂ϕd/∂λ, (2) the sensor length Lw,A, (3) refractive index difference between two modes/arms Δneff,A, (4) sensing parameter dependent length change α, and (5) sensing parameter dependent refractive index change γ. The research papers in the literature that modulate these terms to enhance the sensing sensitivity are reviewed in the paper.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9002878 | PMC |
| http://dx.doi.org/10.3390/s22072506 | DOI Listing |
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