Use of polyethylene glycol coatings for optical fibre humidity sensing

Acikgoz, Sabriye; Bilen, Bükem; Demir, Mustafa M.; Menceloǵlu, Yusuf́ Z.; Skarlatos, Yani; Aktas, Gulen; Incı, Mehmet Nacı

doi:10.1007/s10043-008-0012-1

Cited by 26 publications

(22 citation statements)

References 25 publications

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“…Many of these sensing techniques involve using humidity sensitive coatings or gels on the surfaces or end faces of the optical fiber. For example, hydrogel polymers, such as polyvinyl alcohol (PVA) [15,16], polyethylene glycol [17] and Agarose [18], have been previously proposed and studied as coating materials for optical fiber based humidity sensors. Such polymer coatings have the advantage of good reproducibility and long term stability.…”

Section: Introductionmentioning

confidence: 99%

Agarose coated spherical micro resonator for humidity measurements

Mallik¹,

Liu²,

Kavungal³

et al. 2016

Opt. Express

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Abstract:A new type of fiber optic relative humidity (RH) sensor based on an agarose coated silica microsphere resonator is proposed and experimentally demonstrated. Whispering gallery modes (WGMs) in the micro resonator are excited by evanescent coupling using a tapered fiber with ~3.3 µm waist diameter. A change in the relative humidity of the surrounding the resonator air induces changes in the refractive index (RI) and thickness of the Agarose coating layer. These changes in turn lead to a spectral shift of the WGM resonances, which can be related to the RH value after a suitable calibration. Studies of the repeatability, long-term stability, measurement accuracy and temperature dependence of the proposed sensor are carried out. The RH sensitivity of the proposed sensor depends on the concentration of the agarose gel which determines the initial thickness of the deposited coating layer. Studies of the micro-resonators with coating layers fabricated from gels with three different Agarose concentrations of 0.5%, 1.125% and 2.25 wt./vol.% showed that an increase in the initial thickness of the coating material results in an increase in sensitivity but also leads to a decrease of quality factor (Q) of the micro resonator. The highest sensitivity achieved in our experiments was 518 pm/%RH in the RH range from 30% to 70%. The proposed sensor offers the advantages of a very compact form factor, low hysteresis, good repeatability, and low cross sensitivity to temperature.

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Section: Introductionmentioning

confidence: 99%

Agarose coated spherical micro resonator for humidity measurements

Mallik¹,

Liu²,

Kavungal³

et al. 2016

Opt. Express

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“…As microstrip patch antennas inherently have narrow bandwidth characteristic, there have been numerous techniques developed for bandwidth enhancement to achieve the UWB characteristics. These antennas have been discussed in the literature, for instance, squarering slot antenna [7], U-slot patch antennas [8], and E-shaped patch antenna [9,10]. Other techniques used to increase the bandwidth of antennas included partial ground plane [11,12].…”

Section: Introductionmentioning

confidence: 99%

Optical microfiber coupler based humidity sensor with a polyethylene oxide coating

Lin¹,

Wang²,

Semenova³

et al. 2014

Micro & Optical Tech Letters

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Optical microfiber couplers (MFCs) with certain geometries are sensitive to local refractive changes. By incorporating a humidity‐sensitive polyethylene oxide coating, a tapered optical MFC can work as a humidity sensor. We fabricated such a humidity sensor and demonstrated its sensing ability by monitoring spectral shifts in a wavelength domain. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:457–460, 2015

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“…PEO is another well‐known strongly hydrophilic material and it has been proved that the RI of the thin PEO layer can be modified by water vapor by a number of authors . PEO can also be easily coated on optical fibers due to its high adhesion on silica surfaces.…”

Section: Sensitive Materialsmentioning

confidence: 99%

Research Advances in Microfiber Humidity Sensors

Peng

Zhao

Chen

et al. 2018

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100

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An overview of the numerous latest research in microfiber humidity sensors is carried out with a specific focus on measurement methods, humidity sensitive materials, probe structures, and sensing properties of different sensors. First, five mainstream measurement structures, including taper, fiber grating, coupler, resonator, and interferometer are reviewed. It is concluded that these measurement structures sense the physicochemical property variations of microfibers or sensitive films and exhibit the change of optical signal when exposed to environment. Second, the basic preparation methods, humidity‐sensing properties, and their advantages and disadvantages as humidity sensitive material are addressed. Then, the advantages and disadvantages of all the above sensing structures are also discussed and compared. Finally, the main existing problems and potential solutions of microfiber humidity sensors are pointed out.

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Use of polyethylene glycol coatings for optical fibre humidity sensing

Cited by 26 publications

References 25 publications

Agarose coated spherical micro resonator for humidity measurements

Agarose coated spherical micro resonator for humidity measurements

Optical microfiber coupler based humidity sensor with a polyethylene oxide coating

Research Advances in Microfiber Humidity Sensors

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