Fiber loop ringdown humidity sensor

Haifa Alali; Chuji Wang

doi:10.1364/AO.55.008938

Fiber loop ringdown humidity sensor

Haifa Alali and Chuji Wang

Applied Optics
Vol. 55,
Issue 31,
pp. 8938-8945
(2016)
•https://doi.org/10.1364/AO.55.008938

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Haifa Alali and Chuji Wang, "Fiber loop ringdown humidity sensor," Appl. Opt. 55, 8938-8945 (2016)

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Related Topics
Table of Contents Category
- Fiber Optics and Optical Communications
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Fiber optics sensors (060.2370)
- Optical sensing and sensors (280.4788)

About this Article
History
- Original Manuscript: August 23, 2016
- Revised Manuscript: October 6, 2016
- Manuscript Accepted: October 6, 2016
- Published: October 28, 2016

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Abstract

An optical fiber relative humidity (RH) sensor based on the evanescent field-fiber loop ringdown (EF-FLRD) technique is demonstrated. The sensor was placed inside a chamber that provides a humidity reference and is monitored by a humidity meter. The presence of moisture in the chamber changes the refractive index of the medium; thus the ringdown time changes due to a change in the EF scattering loss induced in the sensor head. The sensor demonstrated a fast response ( $\sim 1 s$ ), high sensitivity, and excellent reproducibility and reversibly. The EF-FLRD sensor can measure RH in a wide dynamic range of 4% to 100% at a constant temperature of $20 \pm 1 ° C$ .

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Fiber Optic Sensor Type	Sensing Technique	Dynamic Range of RH (%)	Temperature (°C)	Response Time	Coating Material	References
FBG	Strain-induced Bragg wavelength	5–95	—	—	Organo-silica hybrid	[35]
	Thin-core fiber modal interferometer	20–90	—	2–10 s	Poly ( $N$ -ethyl-4-vinylpyridinium chloride) and poly(vinylsulfonic acid, sodium salt)	[50]
Optical Fiber	Localized surface plasmon resonance and lossy-mode resonance	20–70	25	2 h	Nanoparticles(NG NPs)	[51]
Plastic Optical Fiber	Ray tracing method	20–80	—	—	hydroxyethylcellulose and polymethylmethacrylate	[38]
PCF	Photonic crystal fiber interferometer	40–90	$24 \pm 1$	75 ms	Agarose film	[41]
Photonic bandgap fiber	Wavelength modulation spectroscopy technique	0–95	—	—	No coating	[52]
SMF	Telecommunications wavelength	$> 62 > 80$	$\sim 22 - 24$	—	Gelatin and polyethylene oxide films	[37]
TFBG	Intensity variation measurement	20–74	—	$< 2 s$	Polyvinyl alcohol	[36]
LPG	LPG resonance band wavelength shift	33–97	—	1 min	Polyvinyl alcohol	[39]
FBG-PCF	Transmission loss measurement	20–90	22	$< 1 s$	Agarose	[40]
SMF	Fiber Loop Ringdown	4–100	$20 \pm 1$	$\sim 1 s$	No coating	This work

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