Discriminative measurement for temperature and humidity using hollow-core Fabry-Perot interferometer

Abstract In this work, an in-fiber Fabry-Perot interferometer (FPI) is proposed and experimentally demonstrated for ambient relative humidity (RH) and temperature measurements. The FPI is manufactured from short segments of hollow-core fiber (HCF) and photonic crystal fiber (PCF). The air-cavity in the HCF segment enables a strong light-air interaction whereas the air holes of the PCF serve as vents which enable the exchange of air between the air-cavity and the surrounding medium. Our findings show that the dip intensity is solely sensitive to the change in RH with a linear sensitivity of 0.06273 dB/%RH in the range of 35–71%RH whereas the dip wavelength is solely sensitive to the ambient temperature with a linear sensitivity of 10.64 pm/°C in the range of 25–70 °C. The cross-sensitivity between the two measurands can be disregarded, therefore no sophisticated equation is required for the discriminative measurement of humidity and temperature.

[1]  Tao Zhu,et al.  Nanocomposite polyacrylamide based open cavity fiber Fabry-Perot humidity sensor. , 2012, Applied optics.

[2]  Y. Semenova,et al.  Relative Humidity Sensor Based on an Agarose-Infiltrated Photonic Crystal Fiber Interferometer , 2012, IEEE Journal of Selected Topics in Quantum Electronics.

[3]  C. R. Biazoli,et al.  Characterisation of a Nafion film by optical fibre Fabry–Perot interferometry for humidity sensing , 2014 .

[4]  Chi-En Lu,et al.  Humidity Sensors: A Review of Materials and Mechanisms , 2005 .

[5]  Xiu Min Ang,et al.  Chitosan based fiber-optic Fabry–Perot humidity sensor , 2012 .

[6]  Qiangzhou Rong,et al.  Temperature-independent hygrometry using micromachined photonic crystal fiber. , 2018, Applied optics.

[7]  Jun Zhang,et al.  High-performance fibre-optic humidity sensor based on a side-polished fibre wavelength selectively coupled with graphene oxide film , 2018 .

[8]  H. Ahmad,et al.  Highly sensitive micro-hygrometer based on microfiber knot resonator , 2019, Optics Communications.

[9]  Shangzhong Jin,et al.  Multiplexing of PVA-coated multimode-fiber taper humidity sensors , 2013 .

[10]  J. Yu,et al.  Analysis of Noise Spread in Optical DFT-S OFDM Systems , 2012, Journal of Lightwave Technology.

[11]  Jianlin Zhao,et al.  A Mach–Zehnder interferometric humidity sensor based on waist-enlarged tapers , 2014 .

[12]  Jiajun Tian,et al.  Optical Fiber Humidity Sensor Based on Water Absorption Peak Near 2-μm Waveband , 2019, IEEE Photonics Journal.

[13]  Jun Cheng.  A stepped Mach-Zehnder interferometric humidity sensor based on lateral offset fusion splicing , 2018 .

[14]  T. L. Yeo,et al.  Fibre-optic sensor technologies for humidity and moisture measurement , 2008 .

[15]  A. Peacock,et al.  Tapered silicon optical fibers. , 2010, Optics express.

[16]  Kenneth T. V. Grattan,et al.  Optical fibre-based sensor technology for humidity and moisture measurement: Review of recent progress , 2013 .

[17]  S. Yam,et al.  Refractive index sensor based on an abrupt taper Michelson interferometer in a single-mode fiber. , 2008, Optics letters.

[18]  Xueguang Qiao,et al.  A fiber-optic refractometer for humidity measurements using an in-fiber Mach–Zehnder interferometer , 2016 .

[19]  Dagong Jia,et al.  Optical Fiber Fabry–Pérot Interferometer Based on an Air Cavity for Gas Pressure Sensing , 2017, IEEE Photonics Journal.

[20]  H. Choi,et al.  All-fiber Mach-Zehnder type interferometers formed in photonic crystal fiber. , 2007, Optics express.

[21]  Changyuan Yu,et al.  A simple fiber-optic humidity sensor based on extrinsic Fabry–Perot cavity constructed by cellulose acetate butyrate film , 2013 .

[22]  S. Harun,et al.  A PMMA microfiber loop resonator based humidity sensor with ZnO nanorods coating , 2017 .

[23]  R Narayanaswamy,et al.  Highly sensitive optical humidity probe. , 2006, Talanta.

[24]  S. Pispas,et al.  Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating. , 2006, Applied optics.

[25]  Ruohui Wang,et al.  Optical fiber humidity sensor based on the direct response of the polyimide film. , 2018, Applied optics.

[26]  X. Tao,et al.  Synergetic Effects of Humidity and Temperature on PMMA Based Fiber Bragg Gratings , 2012, Journal of Lightwave Technology.

[27]  H Y Fu,et al.  Multiplexing of polarization-maintaining photonic crystal fiber based Sagnac interferometric sensors. , 2009, Optics express.

[28]  Antonio Quintela Incera,et al.  Fiber Optic Sensors in Structural Health Monitoring , 2011, Journal of Lightwave Technology.

[29]  C. Liao,et al.  Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing. , 2012, Optics express.

[30]  Yongqin Yu,et al.  High-Sensitivity Mach–Zehnder Interferometric Temperature Fiber Sensor Based on a Waist-Enlarged Fusion Bitaper , 2011, IEEE Sensors Journal.