Simultaneous Measurement of Humidity and Temperature Based on a Long-Period Fiber Grating Inscribed in Fiber Loop Mirror

Liu, Honglin; Liang, Houhui; Sun, Mingming; Ni, Kai; Jin, Yongxing

doi:10.1109/jsen.2013.2290837

Cited by 28 publications

(13 citation statements)

References 22 publications

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“…Equation (7) demonstrates that the temperature variations affect the two parameters: one is the RI of the PS film changes ( dn p dT ) and the other is temperature induced length variation ( dL dT ). Hence, the polymer properties are responsible for the temperature-induced shift of a particular peak.…”

Section: Fresnel Reflection Principlementioning

confidence: 99%

“…Most importantly, among the different types of temperature sensors, optical fiber temperature sensors have successfully replaced traditional sensors owing to their distinctive advantages, including stability, immunity to electromagnetic interference, reusability, durability against stringent environments, high sensitivity, wide dynamic range, multiplexing capability, and fast response in a non-electrical operation [3,4]. A variety of optical fibers have been utilized in the field of optical fiber temperature sensors such as fiber Bragg gratings (FBGs) [2,[4][5][6], long period gratings (LPGs) [7][8][9], hollow core fibers (HCF) [10,11], multimode interference-based optical fibers (MMF) [12], and micro-bend fibers coupled with thin films [13,14]. Despite their many advantages, these optical fiber temperature sensors have some shortcomings, including cross-sensitivity, poor repeatability, and complexity.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Temperature Sensitivity of the Fabry–Perot Interferometer Sensor with Optimization of the Coating Thickness of Polystyrene

Salunkhe

Lee

et al. 2020

Sensors

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The exploration of novel polymers for temperature sensing with high sensitivity has attracted tremendous research interest. Hence, we report a polystyrene-coated optical fiber temperature sensor with high sensitivity. To enhance the temperature sensitivity, flat, thin, smooth, and air bubble-free polystyrene was coated on the edge surface of a single-mode optical fiber, where the coating thickness was varied based on the solution concentration. Three thicknesses of the polystyrene layer were obtained as 2.0, 4.1, and 8.0 μm. The temperature sensor with 2.0 μm thick polystyrene exhibited the highest temperature sensitivity of 439.89 pm °C−1 in the temperature range of 25–100 °C. This could be attributed to the very uniform and thin coating of polystyrene, along with the reasonable coefficient of thermal expansion and thermo-optic coefficient of polystyrene. Overall, the experimental results proved the effectiveness of the proposed polystyrene-coated temperature sensor for accurate temperature measurement.

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Section: Fresnel Reflection Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Temperature Sensitivity of the Fabry–Perot Interferometer Sensor with Optimization of the Coating Thickness of Polystyrene

Salunkhe

Lee

et al. 2020

Sensors

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“…Another sensor example, described in Ref. 129, is apt to measure temperature and humidity simultaneously. It uses a fiber loop that contains a short section of HB fiber with inscribed LPFBG as shown in Fig.…”

Section: Multiparameter Sensors Based On Fiber Loopsmentioning

confidence: 99%

Multiparameter fiber-optic sensors: a review

2019

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Needs for sensor miniaturization, versatile sensing solutions, and improved measurements' performances in difficult operating environments have recently driven considerable research in optical fiber sensor for multiparameter measurements. Multiparameter sensors not only enable new sensors' functionalities, but can also improve achievable measurement performances for some frequently measured parameters considerably. This study provides a review of work in the field of miniature fiber-optic sensors that allows independent and simultaneous measurements of two or more different physical or chemical parameters. Sensor designs and corresponding signal processing schemes are reviewed and compared.

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“…Many effective techniques have been developed to realize multi-parametric measurements with fiber optic sensors. For example, simultaneous measurement of humidity and temperature has been proposed using a combination of a long period grating (LPG) inscribed in a fiber loop mirror [9], a combination of a fiber Bragg grating (FBG) and Fabry-Perot interferometer cavity [10], a FBG and photonics crystal fiber interferometer [11], a LPG partially coated with PAH/PAA poly electrolyte complexes [12], nafion-crystal violet film based optical sensor is to measurement of humidity and ammonia in air simultaneously [13], nano porous layer of alumina is also proposed for sensing of both humidity and ammonia gas [14] and many others. All the above mentioned sensing techniques rely on measurements of characteristic wavelength shifts in the spectra of the sensors influenced by the physical parameters of interest.…”

Section: Introductionmentioning

confidence: 99%

Whispering gallery mode micro resonators for multi-parameter sensing applications

Mallik¹,

Farrell²,

Ramakrishnan³

et al. 2018

Opt. Express

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A novel fiber optic sensing configuration for simultaneously measuring ammonia vapor (NH 3) concentration and relative humidity (RH) in air is proposed and experimentally demonstrated. The system comprised two silica whispering gallery mode (WGM) microsphere resonators coated with different polymer layers. One of the microspheres was dip-coated with sol gel silica polymer and another with a 0.5 % wt./vol. agarose hydrogel. WGMs in both microspheres were excited simultaneously by evanescent coupling using a single adiabatic fiber taper. The optical properties of both coating layers change due to their exposure to ammonia and water molecules in the surrounding atmosphere, resulting in the spectral shifts of the WGM resonances relevant to each of the microspheres. By measuring the relevant WGMs' spectral shifts, the NH 3 concentration in air and the RH can be determined simultaneously. The experimentally demonstrated sensitivity of the proposed sensor array to ammonia was estimated as 19.07 pm/ppm (NH 3 molecules in air) and its sensitivity to relative humidity as 1.07 pm/% RH. Detailed studies of the coatings' cross-sensitivity and temperature dependence are also presented. The proposed sensor array is compact, highly sensitive and potentially low cost.

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Simultaneous Measurement of Humidity and Temperature Based on a Long-Period Fiber Grating Inscribed in Fiber Loop Mirror

Cited by 28 publications

References 22 publications

Enhancing Temperature Sensitivity of the Fabry–Perot Interferometer Sensor with Optimization of the Coating Thickness of Polystyrene

Enhancing Temperature Sensitivity of the Fabry–Perot Interferometer Sensor with Optimization of the Coating Thickness of Polystyrene

Multiparameter fiber-optic sensors: a review

Whispering gallery mode micro resonators for multi-parameter sensing applications

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