A study on evanescent wave humidity sensor based on PEG-PMMA microspheres with enhanced performance | Zendy

Yuxin Chen | Zendy; Yutong Qi | Zendy; Bao Zhu | Zendy; Xingchen Zhou | Zendy; Xuefei Xiao | Zendy; Zheyuan Gu | Zendy; Jun Qian | Zendy; Chuanyang He | Zendy; Min Lai | Zendy; Yan Ma | Zendy; Bo Liu | Zendy

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A study on evanescent wave humidity sensor based on PEG-PMMA microspheres with enhanced performance

Author(s) -

Yuxin Chen,

Yutong Qi,

Bao Zhu,

Xingchen Zhou,

Xuefei Xiao,

Zheyuan Gu,

Jun Qian,

Chuanyang He,

Min Lai,

Yan Ma,

Bo Liu

Publication year - 2025

Publication title -

ieee photonics journal

Language(s) - English

Resource type - Magazines

SCImago Journal Rank - 0.725

H-Index - 73

eISSN - 1943-0655

DOI - 10.1109/jphot.2025.3571489

Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics

In this study, we demonstrate fabrication of an evanescent wave fiber optic humidity sensor based on PEG-PMMA microsphere film as moisture-sensitive material. A three dimensional stacking structure of PEG-PMMA microspheres is formed by dip coating method on fiber core. A simultaneous fast response and recovery is optimized with equilibrium time of 13 s and 8 s between 30%RH and 80%RH, respectively. The sensor possessed a maximum sensitivity of 157.143 lux/%RH in the range of 70-80%RH and a good linear relationship between the logarithm of output optical intensity and relative humidity with a correlation coefficient of 0.998. Moreover, the sensor exhibits low hysteresis, excellent repeatability, short-term and long-term stability and electromagnetic immunity. Modulation of intensity is primarily attributed to scattering of evanescent wave on polymer microspheres in humidity sensing.

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