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2017 ; 17
(4
): ä Nephropedia Template TP
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Recent Developments in Fiber Optics Humidity Sensors
#MMPMID28422074
Ascorbe J
; Corres JM
; Arregui FJ
; Matias IR
Sensors (Basel)
2017[Apr]; 17
(4
): ä PMID28422074
show ga
A wide range of applications such as health, human comfort, agriculture, food
processing and storage, and electronic manufacturing, among others, require fast
and accurate measurement of humidity. Sensors based on optical fibers present
several advantages over electronic sensors and great research efforts have been
made in recent years in this field. The present paper reports the current trends
of optical fiber humidity sensors. The evolution of optical structures developed
towards humidity sensing, as well as the novel materials used for this purpose,
will be analyzed. Well-known optical structures, such as long-period fiber
gratings or fiber Bragg gratings, are still being studied towards an enhancement
of their sensitivity. Sensors based on lossy mode resonances constitute a
platform that combines high sensitivity with low complexity, both in terms of
their fabrication process and the equipment required. Novel structures, such as
resonators, are being studied in order to improve the resolution of humidity
sensors. Moreover, recent research on polymer optical fibers suggests that the
sensitivity of this kind of sensor has not yet reached its limit. Therefore,
there is still room for improvement in terms of sensitivity and resolution.
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