A relative humidity sensing probe based on etched thin-core fiber coated with polyvinyl alcohol

Sun, Hao; Yang, Zaihang; Zhou, Lixin; Liu, Nan; Gang, Tingting; Qiao, Xueguang; Hu, Manli

doi:10.1016/j.optcom.2015.08.058

Cited by 22 publications

(9 citation statements)

References 10 publications

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“…Maximum wavelength shifts of 130 nm have been achieved for relative humidity values varying from 20% to 90%, which implies a sensitivity of 1.9 nm/%RH. The OFHS shows good repeatability, low hysteresis, and also it presents larger dynamic range and better sensitivity, 35% greater than the better found based on LMRs [17] and 200% greater than other devices [8,18,28].…”

Section: Discussionmentioning

confidence: 87%

“…For wavelength based techniques, transmission bands or absorption peaks in the transmission profile should be achieved in order to measure changes on the wavelength where that absorption peak is placed. Absorption peaks could be achieved using several structures, such as long period gratings [6], photonic crystal fibers [7] or interferometric structures [8]; and transmission bands could be achieved, for example, using a single mode-multimode-single mode structure [9]. Most of these structures generate an absorption peak at certain wavelength by creating a grating on the core of the optical fiber, modifying its refractive index or with interferometers.…”

Section: Introductionmentioning

confidence: 99%

“…These structures present some desirable characteristics, such as small spectral width of the attenuation band. On the other hand, the maximum wavelength shift of these devices is around 5 nm [7,8]. Another method for achieving an absorption peak is the generation of Lossy Mode Resonances (LMRs).…”

Section: Introductionmentioning

confidence: 99%

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High sensitivity humidity sensor based on cladding-etched optical fiber and lossy mode resonances

Ascorbe

Corres

Matı́as

2016

Sensors and Actuators B: Chemical

106

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In this work a high sensitivity optical fiber humidity sensor (OFHS) is presented. The configuration chosen for this purpose is a cladding-etched single mode optical fiber (CE-SMF) coated with a thin film of tin oxide (SnO2). The etching has been made using hydrofluoric acid (HF) and the coating has been fabricated by means of sputtering. Tin oxide was used to build the nano-coating which produces the Lossy Mode Resonance (LMR) and works as sensitive material. Theoretical and experimental results are shown and compared. The device was tested using a climatic chamber in order to obtain the response of the OFHS to relative humidity. Changes greater than 130 nm have been obtained for relative humidity varying from 20% to 90%, which gives a sensitivity of 1.9 nm/%RH.

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Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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High sensitivity humidity sensor based on cladding-etched optical fiber and lossy mode resonances

Ascorbe

Corres

Matı́as

2016

Sensors and Actuators B: Chemical

106

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“…Tapered or polished humidity sensor by coating sensitive films on the surface of evanescent field has shown high sensitivity, low hysteresis, acceptable repeatability and fast response and recovery time 9‐15 . Nevertheless, these sensors are susceptible to the fluctuations of light source and fiber loss 8 .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity relative humidity sensor based on SMTF structure coated with gelatin

Guo

Jia

Tang

et al. 2020

Micro & Optical Tech Letters

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A high sensitivity relative humidity sensor based on single mode tapered fiber (SMTF) structure coated with gelatin is reported. The sensing element is composed of a 12‐μm‐diameter fiber taper coated with a thickness of 26‐mm‐length gelatin layer, and is operated at a wavelength of 1550 nm. The sensor is designed based on the intermodal interference effect with high sensitivity (511.33 nW/%RH) and linear response for high RH (72‐90%RH) at 25°C. In this study, we analyzed the factors affecting sensor sensitivity and proposed the method to improve the sensitivity of the sensor. The sensor responses obviously. When the RH increased to more than 70%, the optical power boosts almost 10 000 times, which has promising potential applications as an optical switch in industrial production, food processing, and environmental early warning.

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“…One is based on using specific technologies to form porous sensing structures, such as sputtering [4], electro-spinning [5], electron evaporation [6], or layer-by-layer nano-assembly [7,8]. The other type of RH fiber optic sensors involves using humidity sensitive coatings or gels (hydrophilic materials) on the surface or end face of the optical fiber, such as polyvinyl alcohol [9,10], polyethylene glycol [11], chitosan [12,13], polyethylene oxide [14], graphene oxide [15], metallic oxide film [15,16], agar [17][18][19][20] and indium tin oxide [21,22]. This kind of polymer coatings have advantages of good performance [19], reproducibility, and long-term stability [14].…”

Section: Introductionmentioning

confidence: 99%

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

2018

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In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.Coatings 2018, 8, 453 2 of 9 and desorb water, and also to restore a fast equilibrium with atmospheric humidity. Besides that, it is extremely stable, not soluble in water and can be easily handled for device manufacture [23,31].In this work, a multimode interferometer based on a coreless fiber coated with agarose gel is proposed for the detection of RH. The sensor is easy to produce, presents good resolution, particularly for environments with values of RH higher than 60.0%RH. Sensor Fabrication and Operation Principle

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A relative humidity sensing probe based on etched thin-core fiber coated with polyvinyl alcohol

Cited by 22 publications

References 10 publications

High sensitivity humidity sensor based on cladding-etched optical fiber and lossy mode resonances

High sensitivity humidity sensor based on cladding-etched optical fiber and lossy mode resonances

High sensitivity relative humidity sensor based on SMTF structure coated with gelatin

Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

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