An extrinsic Fabry–Perot interferometer-based large strain sensor with high resolution

Huang, Ying; Wei, Tao; Zhou, Zhi; Zhang, Yinan; Chen, Genda; Xiao, Hai

doi:10.1088/0957-0233/21/10/105308

Cited by 58 publications

(26 citation statements)

References 17 publications

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“…Since the cavity length change of an EFPI can be typically resolved to about 1.3 nm given that the cavity length is 200 µm, the resolution of the OSA is 0.01 nm, and the resonance wavelength is 1550 nm, the theoretical strain resolution of our sensor is calculated to be 13 nε [22].…”

Section: Sensor Structure and Principlementioning

confidence: 99%

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

et al. 2018

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Abstract:A cost-effective, robust and embeddable optical interferometric strain sensor with nanoscale strain resolution is presented in this paper. The sensor consists of an optical fiber, a quartz rod with one end coated with a thin gold layer, and two metal shells employed to transfer the strain and orient and protect the optical fiber and the quartz rod. The optical fiber endface, combining with the gold-coated surface, forms an extrinsic Fabry-Perot interferometer. The sensor was firstly calibrated, and the result showed that our prototype sensor could provide a measurement resolution of 30 nano-strain (nε) and a sensitivity of 10.01 µε/µm over a range of 1000 µε. After calibration of the sensor, the shrinkage strain of a cubic brick of mortar in real time during the drying process was monitored. The strain sensor was compared with a commercial linear variable displacement transducer, and the comparison results in four weeks demonstrated that our sensor had much higher measurement resolution and gained more detailed and useful information. Due to the advantages of the extremely simple, robust and cost-effective configuration, it is believed that the sensor is significantly beneficial to practical applications, especially for structural health monitoring.

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Section: Sensor Structure and Principlementioning

confidence: 99%

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

et al. 2018

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“…By performing the Fourier transform on the recorded interferogram, the optical path difference (OPD) of each FPI can be resolved. The minimum detectable OPD change is given by 14 Δl…”

Section: Signal Processingmentioning

confidence: 99%

Simultaneous measurement of temperature and pressure with cascaded extrinsic Fabry–Perot interferometer and intrinsic Fabry–Perot interferometer sensors

et al. 2014

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Abstract. This paper presents an approach for simultaneous measurement of temperature and pressure using miniaturized fiber inline sensors. The approach utilizes the cascaded optical fiber inline intrinsic Fabry-Perot interferometer and extrinsic Fabry-Perot interferometer as temperature and pressure sensing elements, respectively. A CO 2 laser was used to create a loss between them to balance their reflection power levels. The multiplexed signals were demodulated using a Fast Fourier transform-based wavelength tracking method. Experimental results showed that the sensing system could measure temperature and pressure unambiguously in a pressure range of 0 to 6.895 × 10 5 Pa and a temperature range from 20°C to 700°C. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…These attributes have led to the successful application of optical fiber sensors in structural monitoring and machine control. 1,2 Fiber grating-based sensors, including fiber Bragg gratings (FBGs), [3][4][5] long period fiber gratings (LPFGs), 6,7 and tilted fiber Bragg gratings (TFBG), 8 have been employed as displacement measurement devices, either by direct stretch, the use of cantilever beams and similar structures, or perpendicular displacement to the sensors. Unfortunately, the abovementioned displacement sensing technologies have a major limitation that the measurement dynamic range is restricted due to the glass nature of optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed displacement fiber sensor using thin core fiber exciter

Chen

Hefferman

Wei

2015

Review of Scientific Instruments

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. (2015). Multiplexed displacement fiber sensor using thin core fiber exciter. This letter reports a multiplexed optical displacement sensor using a thin core fiber (TCF) exciter. The TCF exciter is followed by a stripped single mode optical fiber. A small section of buffer is used as the movable component along the single mode fiber. Ultra-weak cladding mode reflection (<−75 dB) was employed to probe the refractive index discontinuity between the air and buffer coating boundary. The position change of the movable buffer segment results in a delay change of the cladding mode reflection. Thus, it is a measure of the displacement of the buffer segment with respect to the glass fiber. The insertion loss of one sensor was measured to be less than 3 dB. A linear relationship was evaluated between the measurement position and absolute position of the moving actuator. Multiplexed capability was demonstrated and no cross talk was found between the sensors. C 2015 AIP Publishing LLC.[http://dx

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An extrinsic Fabry–Perot interferometer-based large strain sensor with high resolution

Cited by 58 publications

References 17 publications

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

Simultaneous measurement of temperature and pressure with cascaded extrinsic Fabry–Perot interferometer and intrinsic Fabry–Perot interferometer sensors

Multiplexed displacement fiber sensor using thin core fiber exciter

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