Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

Ma, Zhibo; Cheng, Shaolei; Kou, Wanying; Chen, Haibin; Wang, Wei; Zhang, Xiongxing; Guo, Tongxin

doi:10.3390/s19194097

Cited by 15 publications

(6 citation statements)

References 36 publications

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“…Relative to grating sensors, EFPI sensors are simple to fabricate. 93 It has been investigated that the initial cavity length does not affect the sensitivity of EFPI sensor, 94 which helps further simplify the EFPI fabrication and ensures its quality control. For applications in RC structures, EFPI is encapsulated in the stainless-steel tube, which protects EFPI from damage during sensor installation and concrete casting.…”

Section: Discussionmentioning

confidence: 99%

Techniques of corrosion monitoring of steel rebar in reinforced concrete structures: A review

Fan

Shi

2021

Structural Health Monitoring

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Reinforcement corrosion is a major culprit that undermines the service life of reinforced concrete (RC) structures. It costs billions of dollars each year in the US alone and negatively impacts safety, reliability, resilience, and environmental performance of RC infrastructure. Corrosion monitoring of steel rebar is critical to provide early warning of deficiency, enable timely and effective maintenance strategies, and prevent catastrophes associated with premature failure of RC structures. To improve corrosion monitoring in the engineering practice, this work comprehensively reviews the state of the art of five major types of techniques, that is, electrochemical sensors, optical fiber sensors, sensors based on elastic wave methods, sensing based on electromagnetic methods, and untouched sensors. Each type of technique is systematically divided into sub-categories based on the sensing principle and key characteristics. For each sensor type, its maturity, application range, and the problems that hinder its application are discussed, aimed to provide guidance in selecting the appropriate sensors for specific engineering applications. This work concludes with an overview of opportunities and challenges, including the following six aspects for future research: spatial resolution, sensitivity, and measurement range; reliability and interpretation of the measurement; sensor selection based on three corrosion stages of steel rebar; long-term stability and service life; cost-efficiency of the sensing system; and monitoring of existing structure.

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Section: Discussionmentioning

confidence: 99%

Techniques of corrosion monitoring of steel rebar in reinforced concrete structures: A review

Fan

Shi

2021

Structural Health Monitoring

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“…The main characteristics of phase-modulated fiber optic sensors are compact size, high sensitivity, geometric versatility, and a wide range of application. Among the manifold optical fiber sensors, the Fabry–Perot interferometer, commonly formed by two parallel reflective mirrors separated by a certain distance, is one of the most widely deployed devices since it offers the potential for high sensitivity, high resolution, and fast response speed [ 29 , 30 , 31 , 32 , 33 , 34 ]. The fiber optic microcantilever sensor introduced in this paper is based on Fabry–Perot interference.…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Probe Microcantilever Sensor Based on Fabry–Perot Interferometer

Yong-zhang

Zheng

Xiao

et al. 2022

Sensors

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Optical fiber Fabry–Perot sensors have long been the focus of researchers in sensing applications because of their unique advantages, including highly effective, simple light path, low cost, compact size, and easy fabrication. Microcantilever-based devices have been extensively explored in chemical and biological fields while the interrogation methods are still a challenge. The optical fiber probe microcantilever sensor is constructed with a microcantilever beam on an optical fiber, which opens the door for highly sensitive, as well as convenient readout. In this review, we summarize a wide variety of optical fiber probe microcantilever sensors based on Fabry–Perot interferometer. The operation principle of the optical fiber probe microcantilever sensor is introduced. The fabrication methods, materials, and sensing applications of an optical fiber probe microcantilever sensor with different structures are discussed in detail. The performances of different kinds of fiber probe microcantilever sensors are compared. We also prospect the possible development direction of optical fiber microcantilever sensors.

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“…Fiber-optic strain sensors are reported in different designs and methodologies, such as fiber Bragg grating (FBG) [ 5 , 6 ], long period grating (LPG) [ 7 , 8 ], Mach–Zehnder Interferometer (MZI) [ 9 , 10 , 11 ], Michelson Interferometer (MI) [ 12 , 13 , 14 ], and FPI [ 15 , 16 ]. The FPI in fiber-optic strain sensors is most prominent, which can be realized by creating an air-gap/cavity to form two in-line reflective mirrors in an optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Strain Sensor by Utilizing a Tunable Air Reflector and the Vernier Effect

Mumtaz

Roman

Zhang

et al. 2022

Sensors

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A highly sensitive strain sensor based on tunable cascaded Fabry–Perot interferometers (FPIs) is proposed and experimentally demonstrated. Cascaded FPIs consist of a sensing FPI and a reference FPI, which effectively generate the Vernier effect (VE). The sensing FPI comprises a hollow core fiber (HCF) segment sandwiched between single-mode fibers (SMFs), and the reference FPI consists of a tunable air reflector, which is constituted by a computer-programable fiber holding block to adjust the desired cavity length. The simulation results predict the dispersion characteristics of modes carried by HCF. The sensor’s parameters are designed to correspond to a narrow bandwidth range, i.e., 1530 nm to 1610 nm. The experimental results demonstrate that the proposed sensor exhibits optimum strain sensitivity of 23.9 pm/με, 17.54 pm/με, and 14.11 pm/με cascaded with the reference FPI of 375 μm, 365 μm, and 355 μm in cavity length, which is 13.73, 10.08, and 8.10 times higher than the single sensing FPI with a strain sensitivity of 1.74 pm/με, respectively. The strain sensitivity of the sensor can be further enhanced by extending the source bandwidth. The proposed sensor exhibits ultra-low temperature sensitivity of 0.49 pm/°C for a temperature range of 25 °C to 135 °C, providing good isolation for eliminating temperature–strain cross-talk. The sensor is robust, cost-effective, easy to manufacture, repeatable, and shows a highly linear and stable response for strain sensing. Based on the sensor’s performance, it may be a good candidate for high-resolution strain sensing.

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Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

Cited by 15 publications

References 36 publications

Techniques of corrosion monitoring of steel rebar in reinforced concrete structures: A review

Techniques of corrosion monitoring of steel rebar in reinforced concrete structures: A review

Optical Fiber Probe Microcantilever Sensor Based on Fabry–Perot Interferometer

Highly Sensitive Strain Sensor by Utilizing a Tunable Air Reflector and the Vernier Effect

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