An evanescent-wave optical fiber relative humidity sensor with enhanced sensitivity

Khijwania, Sunil K.; Srinivasan, Kirthi L.; Singh, Jagdish P.

doi:10.1016/j.snb.2004.05.012

Cited by 175 publications

(78 citation statements)

References 7 publications

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“…This can be explained with reference to the relationship between EW penetration depth and film thickness. Optimum film thickness needs to be lower than or equal to the EW penetration depth as sensitivity decreases due to the lack of interaction between EW and the surrounding environment [16].…”

Section: Sensor Fabrication Monitoringmentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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The sensitivity of a low-cost polymeric optical fibre humidity sensor based on transmittance changes due to evanescent wave absorption is reported using test measurements in an environmental chamber and of the skin. The layer-by-layer method was used to coat 30mm of the central unclad section of a multimode polymeric optical fibre with 7 layers of a hydrophilic film consisting of bilayers of poly(allylamine hydrochloride) and SiO2 mesoporous nanoparticles. Sensor characterisation shows a decrease in light transmission as relative humidity increases as a result of refractive index changes of the coating deposited onto the optical fibre which correlates with a commercial capacitive humidity sensor. The sensitivity obtained for the sensor coated with an optimum 7 layers was approximately -3.87x10 -3 and -9.61x10 -3 in transmittance percentage per RH percentage for the range of ~10% to ~75% RH and 90% to 97% RH, respectively. In addition, a response time of 1.5s can be seen for breath monitoring with the polymeric optical fibre humidity sensor. The proof of concept measurements made on the skin indicate that this sensor has the potential to be used to monitor humidity of the skin microenvironment within a wound dressing which can be used to provide better prognosis of healing.

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Section: Sensor Fabrication Monitoringmentioning

confidence: 99%

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Gómez

Morgan

Hayes-Gill

et al. 2018

Sensors and Actuators B: Chemical

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“…Pada saat sinar cahaya menjalar pada serat optik, sebagian gelombang terserap ke dalam cladding dan energi gelombang tersebut menghilang secara eksponensial, gelombang evanescent diberikan oleh persamaan [9,10] …”

Section: Pendahuluanunclassified

Pengembangan Probe Sensor Kelembaban Serat Optik Dengan Cladding Gelatin

Maddu¹,

Modjahidin²,

Sardy³

et al. 2010

MST

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AbstrakTelah dikembangkan probe sensor kelembaban menggunakan serat optik dengan cladding gelatin. Pada probe sensor kelembaban ini, cladding asli serat optik diganti dengan lapisan gelatin sebagai cladding sensitif kelembaban. Untuk menguji respon sensor serat optik yang dibuat, dilakukan pengukuran intensitas cahaya yang ditransmisikan pada probe serat optik untuk setiap variasi perlakuan kelembaban berbeda. Respon probe sensor serat optik ini diukur dari kelembaban 42% hingga 99% RH, hasilnya memperlihatkan kurva transmisi optik berbavariasi terhadap nilai kelembaban relatif (RH). Transmisi optik di dalam probe serat optik meningkat terhadap kenaikan nilai RH pada suatu rentang panjang gelombang spesifik, yaitu pada spektrum pita hijau hingga merah (500 nm -700 nm), dengan variasi signifikan pada rentang 600 nm sampai 650 nm atau dalam pita spektrum kuning hingga merah. Panjang gelombang dimana intensitas maksimum transmisi optik terjadi pada panjang gelombang 610 nm. Dengan demikian, probe sensor kelembaban serat optik ini dapat merespon kelembaban dari 42 %R hingga 99%H dengan respon terbaik pada rentang kelembaban 60%RH hingga 72%R yang memiliki linieritas dan sensitifitas yang cukup baik. AbstractDevelopment of Fiber-Optic Humidity Sensor Probe with Gelatin Cladding. Humidity sensor based on optical fiber with gelatin cladding has been developed. In this humidity sensor probe, the origin cladding of optical fiber is replaced by gelatin coating as humidity sensitive cladding. Testing of the optical fiber sensor probe was conducted by measuring of light intensity transmitted on the optical fiber probe for each variation of different humidity treatments. Response of the optical fiber sensor probe measured from 42%RH to 99%RH, the results show an optical transmission curve varied with relative humidity (RH). Optical transmission in the optical fiber probe increase with RH value at a specific wavelength range, that is from green to red spectrum bands (500 nm -700 nm), where a significant variation from 600 nm to 650 nm in yellow to red spectrum bands. Wavelength where is a maximum intensity of optical transmission occurs at 610 nm. Therefore, the optical fiber humidity sensor probe could response humidity form 42%RH to 99%RH with the best response in humidity range of 60%RH to 72%RH that is have a good linearity and sensitivity.

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“…[2] However, potentially competent electronic based sensor as conventional technique e.g., capacitance based, wet-dry bulb and solid-state humidity sensors are also widely deployed and comprehensively practice in targeting the present of volatile organic compounds. [3][4] ZnO instead of TiO2 as a sensitive material coating to sense the present of gas in various experiment has been utilized since 1962. [5][6] This material has been synthesized in various forms, such as single crystals, sintered pellets, thick layer, a thin layer, and heterojunction.…”

Section: Introductionmentioning

confidence: 99%

Optical Sensing Performance of Multimode Polymer Optical Fiber (POF) Coated with ZnO towards Methanol Vapour

Mulyanti

Pantjawati

Hasanah

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this work, optical sensing performance of multimode polymer optical fiber coated with ZnO towards methanol vapour with different concentrations is studied. The etching process of the POF was carried out using chemical etching method. ZnO was synthesized with sol-gel method to obtain the sensitive material coating. The etched optical fiber was then dipcoated with ZnO and dried at 70oC to enhance the binding of the materials and to remove organic residue. Scanning Electron Microscope (SEM), and X-Ray poer Difraction (XRD) analyses were performed to characterize the ZnO layer. The measurements of optical performance were taken using a spectrophotometer in the optical wavelength in the range of 500-8000nm. The absorbance response of the ZnO coated etched fiber reduced proportionally, upon exposure to methanol vapour with concentration in the range of 5%-50%.

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An evanescent-wave optical fiber relative humidity sensor with enhanced sensitivity

Cited by 175 publications

References 7 publications

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Polymeric optical fibre sensor coated by SiO2 nanoparticles for humidity sensing in the skin microenvironment

Pengembangan Probe Sensor Kelembaban Serat Optik Dengan Cladding Gelatin

Optical Sensing Performance of Multimode Polymer Optical Fiber (POF) Coated with ZnO towards Methanol Vapour

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