Fiber-Optic Anti-Resonance and Interference Effect Superimposed Sensor for Simultaneous Measurement of Temperature and Salinity With Low Crosstalk

Anti-resonance (AR) is a special optical resonance phenomenon developed in the past decade, which has been researched for telecommunication networks, supercontinuum lasers, and sensing due to its low loss, broad tunable range, and high sensitivity. Here, a novel seawater temperature and salinity sim...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2024, Vol.73, p.1-8
Main Authors: Zhao, Jian, Zhao, Yong, Zhang, Ya-Nan, Lv, Ri-Qing, Li, Xu-Gang, Zhang, Hua-Guang
Format: Article
Language:English
Subjects:
Algorithms
Anti-resonance
Claddings
Crosstalk
Decoupling
Ethanol
Fiber optics
fiber-optic sensor
Interference
low crosstalk
Mach–Zehnder interference
Optical fiber sensors
Optical resonance
Parameters
Polynomials
Salinity
Salinity (geophysical)
Seawater
Sensitivity
Sensors
Structural stability
superimposition effect
Temperature measurement
Temperature sensors
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Summary:Anti-resonance (AR) is a special optical resonance phenomenon developed in the past decade, which has been researched for telecommunication networks, supercontinuum lasers, and sensing due to its low loss, broad tunable range, and high sensitivity. Here, a novel seawater temperature and salinity simultaneous measurement sensor with remarkable sensitivity and low crosstalk is demonstrated using the superimposition of AR effect and Mach-Zehnder interference. The AR is excited by a temperature-sensitive material-filled hollow core tube fiber (HCTF), while the interference is formed by a single-mode fiber (SMF) with a transverse penetration channel. The simulation analysis and experimental test results indicate that the characteristic dips of AR and interference structures coexist in the spectral curve. According to the wavelength position of the characteristic dips, and combined with the polynomial surface decoupling algorithm to reduce crosstalk between measured parameters, the sensor realizes the temperature and salinity sensing with the minimum sensitivities of 1.825 nm/°C and −2.584 nm/‰, respectively. The technique uses commercial fiber-optic components to make a cost-effective all-fiber probe with compact structure, good stability, and excellent processing consistency for reliable seawater parameters' measurement.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2024.3398078