Mach–Zehnder Photonic Crystal Interferometer in Cavity Ring-Down Loop for Curvature Measurement

Wong, Wei Chang; Chan, Chi Chiu; Gong, Huaping; Leong, K. C.

doi:10.1109/lpt.2011.2132796

Cited by 31 publications

(1 citation statement)

References 9 publications

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“…Optical fiber sensors have several advantages over other sensing concepts, including immunity to electromagnetic interference, intrinsic electrically passivity operation, high sensitivity, simple configuration and low cost, etc. In recent years, much attention has been focused on all-fiber intermodal interferometers (IMIs) and their applications as sensors for measurements of various parameters including refractive index [1]- [4], curvature [5]- [7], temperature [7], [8], strain [9], [10], displacement [11], etc. These sensors are based on the excitation of high order modes and combination them with fundamental mode to generate interference.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Strain and Temperature with Hollow Core Fiber Based Intermodal Interferometer

Dong

et al. 2013

AMM

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A hollow core fiber based all-fiber intermodal interferometer is proposed for measurement of strain and temperature. The sensing structure is simply a short segment of hollow core silica fiber being spliced between two normal single mode fibers. The fabrication process only involves a conventional fusion splicer and a mechanical fiber cleaver. Experimental results show that sensitivities of-1.21 pm/με and 21.30 pm/°C are achieved for strain and temperature measurements, respectively.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Strain and Temperature with Hollow Core Fiber Based Intermodal Interferometer

Dong

et al. 2013

AMM

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Temperature insensitive curvature sensor based on a combination interference structure and an intensity demodulation method

Zhao

Gao

Yang³

2015

Micro & Optical Tech Letters

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In this article, a sensing head consisting of fiber loop mirror inscribed with a highly Birefringence photonic crystal fiber (HiBi‐PCF) was proposed and experimentally demonstrated. The fully collapsed air holes of the PCF at the spice regions allow the coupling of PCF core and cladding modes that makes a Mach–Zehnder interferometer. The couple efficiency of the core mode to the cladding mode will be decreased as the curvature on the HiBi‐PCF part is increased. The curvature variation on the HiBi‐PCF part can be obtained by detecting the fringe visibility of the interference patterns. Experimental results show that the curvature sensor with maximal sensitivity of 10.171 dB/m−1 within a measurement range of 0–0.48 m−1 is obtained. Owing to the low thermo‐optic and thermo‐expansion coefficient of the HiBi‐PCF and with the using of intensity demodulation method, the proposed sensor can overcome the temperature and curvature cross‐sensitivity effects. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:806–809, 2015

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Terahertz refractive index sensor with high sensitivity based on two‐core photonic crystal fiber

Mishra¹,

Kumar²,

Chaudhary³

et al. 2020

Micro & Optical Tech Letters

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This article contributes a highly sensitive novel refractive index (RI) sensor based on two-core photonic crystal fiber (PCF) is proposed in the terahertz (THz) frequency regime. The sensing performance of the proposed RI sensor is based on the mode-coupling theory. Two vertical cores of the PCF divided by the central air hole, act as two separate waveguides. The analyte whose refractive index being sensed is filled in the central air hole of the PCF. A full-vector finite element method (FEM) approach is used to investigate the sensor. Numerical data reveal that the sensitivities of the proposed PCF are 672 600, 940480, 1035300, 1332200, and 1 827 300 nm/RIU for the RI sensing range of analyte from 1.30 to 1.33, 1.34 to 1.37, 1.38 to 1.40, 1.41 to 1.43, and 1.44 to 1.46, respectively. This indicates that the proposed RI sensor is highly sensitive to the refractive index of the analyte.

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Mach–Zehnder Photonic Crystal Interferometer in Cavity Ring-Down Loop for Curvature Measurement

Cited by 31 publications

References 9 publications

Simultaneous Measurement of Strain and Temperature with Hollow Core Fiber Based Intermodal Interferometer

Simultaneous Measurement of Strain and Temperature with Hollow Core Fiber Based Intermodal Interferometer

Temperature insensitive curvature sensor based on a combination interference structure and an intensity demodulation method

Terahertz refractive index sensor with high sensitivity based on two‐core photonic crystal fiber

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