Journal
SENSORS
Volume 18, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s18072029
Keywords
fiber optics sensors; relative humidity; polyvinyl alcohol; breathing test
Funding
- National Natural Science Foundation of China (NSFC) [61675137, 61425007, 61635007]
- Guangdong Natural Science Foundation [2015B010105007, 2014A030308007]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20160307143501276, JCYJ20160307143716576, JCYJ20160427104925452]
- Open Fund of the Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications (Jinan University)
- Development and Reform Commission of Shenzhen Municipality Foundation
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A surface plasmon resonance (SPR) sensor based on a side-polished single mode fiber coated with polyvinyl alcohol (PVA) is demonstrated for relative humidity (RH) sensing. The SPR sensor exhibits a resonant dip in the transmission spectrum in ambient air after PVA film coating, and the resonant wavelength shifts to longer wavelengths as the thickness of the PVA film increases. When RH changes, the resonant dip of the sensor with different film-thicknesses exhibits interesting characteristics for optical spectrum evolution. For sensors with initial wavelengths between 550 nm and 750 nm, the resonant dip shifts to longer wavelengths with increasing RH. The averaged sensitivity increases firstly and then drops, and shows a maximal sensitivity of 1.01 nm/RH%. Once the initial wavelength of the SPR sensor exceeds 850 nm, an inflection point of the resonant wavelength shift can be observed with RH increasing, and the resonant dip shifts to shorter wavelengths for RH values exceeding this point, and sensitivity as high as 4.97 nm/RH% can be obtained in the experiment. The sensor is expected to have potential applications in highly sensitive and cost effective humidity sensing.
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