LPG-Based PVA Coated Sensor for Relative Humidity Measurement

Venugopalan, T.; Yeo, T.L.; Sun, Tao; Grattan, K. T. V.

doi:10.1109/jsen.2008.926524

Cited by 74 publications

(15 citation statements)

References 21 publications

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“…Throughout the experiment, the temperature and relative humidity were maintained constant and recorded to be 25 ± 1 ºC and 33% ± 2% respectively. Under these conditions, prior work has shown that the impact on the resonance wavelength of the PVA coated LPG due to variations in temperature or relative humidity is insignificant [7]. Fig.…”

Section: B Lpg Coating Evaluationmentioning

confidence: 92%

“…It can be seen that the external RI value changes over the range from 1.30 to 1.45, where the resonance wavelength of the bare LPG shifts towards the shorter wavelengths, with a highest sensitivity being observed when it is approaching 1.45 (equal to the value of the cladding RI). This is because under this specific circumstance, the fibre core is effectively surrounded by an "infinite" cladding, which does not support any discrete mode and this leads to the disappearance of the resonance bands as there are no cladding modes which can be coupled to the core mode [7].…”

Section: A Long Period Gratings For Sensing Applicationsmentioning

confidence: 99%

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Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index

et al. 2013

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-Recent research has shown that the transmission spectrum of a long period grating (LPG) written into an optical fiber is sensitive to the thickness and the refractive index (RI) of a thin layer deposited on it, a concept which forms the basis of a number of optical fiber sensors. The research reported herein is focused, in particular, on sensors of this type to create a design with an optimized thickness of the deposited layers of polyvinyl alcohol (PVA) on LPGs forming the basis of a highly sensitive probe. In creating such sensors, the dip-coating technique is used to minimize deleterious effects in the attenuation bands resulting from the inhomogeneity of the coated surface. In this paper, LPGs with different coating thicknesses are uniformly coated with thin layers of PVA and submerged in oils of known RI over the range from 1.30 to 1.70, to create effective RI probes. It is observed that when the coating thickness reaches a particular value that enables a substantial redistribution of the optical power within the overlay, a maximum sensitivity of the sensor can be achieved, even when the overlay has a RI higher than that of the cladding. Permanent repository link

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Section: B Lpg Coating Evaluationmentioning

confidence: 92%

Section: A Long Period Gratings For Sensing Applicationsmentioning

confidence: 99%

Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index

et al. 2013

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“…Among the different parameters able to influence the spectral features of LPGs, the surrounding refractive index (SRI) sensitivity can be considered as a key feature enabling the use of this sensors in chemical and biological applications through the integration with functional overlays [11] [12]. Moreover, the SRI sensitivity can be optimized by acting on the thickness and optical properties of the functional overlay [10]. Several kinds of materials have been explored as coating for the development of LPG RH sensors, including polymers [9] [10], hydrogels [13], gelatine [14], cobalt chloride based materials [15] and SiO2 nanosphere [16].…”

Section: Methodsmentioning

confidence: 99%

Radiation tolerant humidity sensors based on nano-scale TiO<inf>2</inf>-coated LPGs for high-energy physics applications

Berruti

Consales

Borriello³

et al. 2014

2014 Third Mediterranean Photonics Conference

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This contribution deals with a feasibility analysis for the development of radiation tolerant fiber optic humidity sensors based on long period grating (LPG) technology to be applied in high-energy physics (HEP) experiments currently running at the European Organization for Nuclear Research (CERN). Here we propose a highsensitivity LPG sensor coated with a finely tuned titanium dioxide (TiO2) thin layer (~100 nm thick) for relative humidity (RH) monitoring in the humidity range [0-75]%RH and in the temperature range [-10°C, 25]°C. Experimental results demonstrate the very high RH sensitivities of the proposed device (up to 1.4 nm/%RH at low humidity). The TiO2-coated LPG sensor radiation tolerance is also investigated up to 1Mrad -ionizing radiation dose. Collected results demonstrate the strong potentialities of the proposed technology in light of its future exploitation in HEP applications.

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“…Different types of humidity sensors based on fiber optical sensing have been proposed, such as polymercoated Bragg grating fiber [1], long period fiber gratings (LPFG) [2], agarose-infiltrated photonic crystal fiber (PCF) interferometers [3], nonadiabatic tapered fiber coated with PDDA/Poly-R-478 film [4], U-shaped fiber coated by phenol red-doped PMMA [5], and interference structures [6]. Above all, the interference structures, particularly MZI, are more practical because of their compact structure, low cost, and easy fabrication and are widely used for temperature, strain, and refractive index measurement [7].…”

Section: Introductionmentioning

confidence: 99%

Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

Huang

Wang

2018

International Journal of Optics

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A novel humidity sensor based on Mach-Zehnder interferometer (MZI) with the single-mode fiber (SMF) coated with methylcellulose (MC) is proposed and experimentally demonstrated. The MZI consists of two waist enlarged structures. Such an all-fiber MZI incorporates an intermodal interference between the core mode and cladding modes. The MC is coated on the surface of the SMF. External humidity changes the refractive index of MC, causing the intensity changes of the interference pattern. The proposed sensor is linearly responsive to refractive humidity (RH) within the range from 45% to 85% RH, with sensitivity of 0.094 dB/%RH. Moreover the insensitivity of the fiber to the temperature makes this structure more suitable for practical measurement.

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LPG-Based PVA Coated Sensor for Relative Humidity Measurement

Cited by 74 publications

References 21 publications

Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index

Analysis of the Characteristics of PVA-Coated LPG-Based Sensors to Coating Thickness and Changes in the External Refractive Index

Radiation tolerant humidity sensors based on nano-scale TiO<inf>2</inf>-coated LPGs for high-energy physics applications

Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

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