Relative humidity sensor based on cascaded long-period gratings with hydrogel coatings and Fourier demodulation

Xiujuan Yu; Paul Childs; Min Zhang; Yanbiao Liao; Jian Ju; Wei Jin

doi:10.1109/LPT.2009.2034620

Relative humidity sensor based on cascaded long-period gratings with hydrogel coatings and Fourier demodulation

Xiujuan Yu, Paul Childs, Min Zhang, Yanbiao Liao, Jian Ju, Wei Jin

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

30 Citations (Scopus)

Abstract

A Mach-Zehnder interferometer based on cascaded long-period gratings with a hydrogel thin-film coating is developed for monitoring the relative humidity (RH). The visibility of fringes and phase shift of the fringes are measured using Fourier analysis. The sensors show good linearity using the visibility of fringes from 60%RH to 100%RH with the ability to measure below 60% at reduced accuracy using the phase shift. An RH accuracy of 0.4% is achieved.

Original language	English
Article number	5291749
Pages (from-to)	1828-1830
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	21
Issue number	24
DOIs	https://doi.org/10.1109/LPT.2009.2034620
Publication status	Published - 1 Dec 2009

Keywords

Cascaded long-period gratings (LPGs)
Hydrogel
Optical fiber sensors
Relative humidity (RH)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

More information

10.1109/LPT.2009.2034620

Cite this

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abstract = "A Mach-Zehnder interferometer based on cascaded long-period gratings with a hydrogel thin-film coating is developed for monitoring the relative humidity (RH). The visibility of fringes and phase shift of the fringes are measured using Fourier analysis. The sensors show good linearity using the visibility of fringes from 60%RH to 100%RH with the ability to measure below 60% at reduced accuracy using the phase shift. An RH accuracy of 0.4% is achieved.",

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AU - Liao, Yanbiao

AU - Ju, Jian

AU - Jin, Wei

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AB - A Mach-Zehnder interferometer based on cascaded long-period gratings with a hydrogel thin-film coating is developed for monitoring the relative humidity (RH). The visibility of fringes and phase shift of the fringes are measured using Fourier analysis. The sensors show good linearity using the visibility of fringes from 60%RH to 100%RH with the ability to measure below 60% at reduced accuracy using the phase shift. An RH accuracy of 0.4% is achieved.

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KW - Optical fiber sensors

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JF - IEEE Photonics Technology Letters

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Relative humidity sensor based on cascaded long-period gratings with hydrogel coatings and Fourier demodulation

Abstract

Keywords

ASJC Scopus subject areas

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