Fiber-optic humidity sensor based on an air-gap long period fiber grating

Fu, Ming‐Yue; Lin, Guei-Ru; Liu, Wen‐Fung; Wu, Chia-Chun

doi:10.1007/s10043-011-0038-7

Cited by 32 publications

(18 citation statements)

References 12 publications

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“…A novel method for the fabrication of LPGs (schematized in Figure 7 ) has been developed in [ 45 ]. It combines the fiber side-polishing and fiber etching methods to create air gaps on the polished region that reach the core of the optical fiber.…”

Section: Recent Trends In Optical Fiber Humidity Sensorsmentioning

confidence: 99%

Recent Developments in Fiber Optics Humidity Sensors

Ascorbe

Corres

Arregui

et al. 2017

Sensors

201

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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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Section: Recent Trends In Optical Fiber Humidity Sensorsmentioning

confidence: 99%

Recent Developments in Fiber Optics Humidity Sensors

Ascorbe

Corres

Arregui

et al. 2017

Sensors

201

View full text Add to dashboard Cite

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“…Thus, to realize these sensors, POFs (polymer optical fibers) fabricated using PMMA have been used in various studies 33 . Additionally, a few studies have also reported the use of conventional SMF based on either tilted FBGs or long period gratings [34][35][36] . The sensors based on these studies are also highly sensitive, but they suffer from a high response time.…”

Section: Microstructured Optical Fiber Based Fabry-pérot Interferometmentioning

confidence: 99%

Microstructured optical fiber based Fabry–Pérot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring

Shrivastav

Gunawardena

Liu

et al. 2020

Sci Rep

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This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. The use of the probe for real-time breath monitoring was also successfully demonstrated. The probe possessed a maximum sensitivity of 81.05 pm/(%RH) for 90–95%RH range while the linear region of the sensor ranged from 70–95%RH. The temperature cross correlation was also experimented, and a lower influence of external temperature was observed. The probe shows an ultrafast response during human breath monitoring with a rising time and recovery time of 80 ms and 70 ms, respectively.

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“…This improves the sensitivity and selectivity of the sensor so that it is mainly sensitive to humidity changes. Other fiber coatings, which have been investigated recently were based on thin films of calcium chloride [ 106 ], poly(ethylene oxide)/cobalt chloride (PEO/CoCl 2 ) [ 107 ], diamond-like carbon [ 108 ], hydrogel [ 109 , 110 ], polyimide coating [ 111 ].…”

Section: Optical Humidity Sensorsmentioning

confidence: 99%

Toward a New Generation of Photonic Humidity Sensors

Kolpakov

Gordon

Mou

et al. 2014

Sensors

120

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This review offers new perspectives on the subject and highlights an area in need of further research. It includes an analysis of current scientific literature mainly covering the last decade and examines the trends in the development of electronic, acoustic and optical-fiber humidity sensors over this period. The major findings indicate that a new generation of sensor technology based on optical fibers is emerging. The current trends suggest that electronic humidity sensors could soon be replaced by sensors that are based on photonic structures. Recent scientific advances are expected to allow dedicated systems to avoid the relatively high price of interrogation modules that is currently a major disadvantage of fiber-based sensors.

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Fiber-optic humidity sensor based on an air-gap long period fiber grating

Cited by 32 publications

References 12 publications

Recent Developments in Fiber Optics Humidity Sensors

Recent Developments in Fiber Optics Humidity Sensors

Microstructured optical fiber based Fabry–Pérot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring

Toward a New Generation of Photonic Humidity Sensors

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