Temperature-independent strain sensor system using a tilted fiber Bragg grating demodulator

seungsik, kang; Kim, Se Yoon; Lee, Sang Bae; Kwon, Seo Won; Choi, Sang Sam; Lee, Byoungho

doi:10.1109/68.720294

Cited by 73 publications

(11 citation statements)

References 10 publications

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“…This means that more changes in

Δ n_{e f f}

, resulting in larger wavelength shifts and thus higher sensitivities, are achieved in the presence of Pt coating. In addition, the strain sensitivity we obtained was higher than that of the tapered SMS structure (0.7 pm/με) [22], the MZI based on polarization-maintaining PCF (1.01 pm/με) [25], and the traditional FBGs (1.4 pm/με) [26]. …”

Section: Resultsmentioning

confidence: 99%

Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

Dong

Sun

et al. 2018

Materials

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We demonstrated a fiber in-line Mach-Zehnder interferometer (MZI) coated with platinum (Pt) for the simultaneous measurement of strain and temperature. The sensor was fabricated by splicing a section of multimode fiber (MMF) between two single mode fibers (SMFs) and the Pt coating was prepared by iron sputtering technology. Fine interference fringes of over 20 dB with a compact size of 20 mm were achieved. The experimental results of the two different resonant dips showed strain sensitivities of −2.06 pm/με and −2.21 pm/με, as well as temperature sensitivities of 55.2 pm/°C and 53.4 pm/°C, respectively. Furthermore, it was found that the Pt coating can improve the strain sensitivity significantly, resulting in an increase of about 54.5%. In addition, the sensor has advantages of easy fabrication, low cost, and high sensitivity, showing great potential for the dual-parameter sensing of strain and temperature.

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“…This means that more changes in

Δ n_{e f f}

Section: Resultsmentioning

confidence: 99%

Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

Dong

Sun

et al. 2018

Materials

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“…In order to verify the effectiveness of this new type of lateral deformation monitoring system, indoor and field experiments were performed which verified the reliability of this instrument. Kang et al [25] demonstrated a new approach for the demodulation of a FBG strain sensor by combining a tilted FBG demodulator with a temper atureindependent property and a dual-head FBG sensor with a temper ature-discriminating property. This new type of technology guaranteed a stable measurement independent of temper ature perturbation with a minimum resolvable strain of 10uε and a dynamic range of 1800uε.…”

Section: A New Deflection Solution and Application Of A Fiber Bragg G...mentioning

confidence: 99%

A new deflection solution and application of a fiber Bragg grating-based inclinometer for monitoring internal displacements in slopes

Zheng

Huang

Shi

2018

Meas. Sci. Technol.

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Landslide monitoring is critical for predicting the stability of slopes to ensure the safety of life and property. Considering the potential advantages of fiber Bragg gratings (FBGs), such as immunity to electromagnetic interference, resistance to hostile environments, light weight, and high measurement precision and real time response, a self-designed, FBG-based in situ inclinometer combining a traditional inclinometer and FBG technology was designed to monitor the inner deformation of a slope. In practical landslide monitoring, the inclinometer can be regarded as a cantilever beam with one end fixed. Based on the deflection curve equation of a normal beam and the composite Simpson integral equation, a theoretical deflection equation of the FBG-based inclinometer versus longitudinal strain was established. A FBG-based inclinometer was fabricated and calibrated in the laboratory and a calibration strain sensitivity coefficient was obtained. The results of calibration tests show that the displacements measured by dial indicators are in good agreement with the theoretical displacements calculated using the proposed equation. A series of FBG-based inclinometers were installed into three vertical boreholes located at different points on the profile of an actual reinforced slope. The in situ monitoring results show that the FBG-based inclinometer can effectively capture the real-time internal displacements and potential sliding surface of the slope, proving the validity of the proposed theoretical equation as well the reliability and practicality of the proposed FBG-based inclinometer in engineering applications.

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“…A number of schemes have been proposed to overcome this limitation. Recently, several techniques have been proposed to discriminate the strain and temperature, such as Dual-wavelength superimposed FBGs [1], Fabry-Perot Cavity [2], Tilted FBG [3,4], Birefringence effect [5], Superstructure FBG [6], Hybrid FBG Long Period Fiber Grating [7], step spectrum profile FBG arrangement [8] and Single FBG [9,10]. The discrimination of the temperature and strain were carried out at room temperature and above.…”

Section: Introductionmentioning

confidence: 99%

An FBG sensor for strain and temperature discrimination at cryogenic regime

Sengupta

Shankar

Kishore

et al. 2011

Optical Sensors and Biophotonics III

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A simple technique to discriminate the Strain and Temperature with a single Fiber Bragg Grating (FBG) at cryogenic regime is presented in this paper. An uniform FBG is divided into two parts, one half is without coating (FBG1) and other half is coated with Cyno-Acrylic Adhesive (FBG2). The measured temperature and strain sensitivities of the FBG1 are 4.05x10-6/K and 2.13x10-6/µε and FBG2 are 1.39x10-5/K and 1.72x10-6/µε respectively.

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Temperature-independent strain sensor system using a tilted fiber Bragg grating demodulator

Cited by 73 publications

References 10 publications

Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

Simultaneous Strain and Temperature Sensor Based on a Fiber Mach-Zehnder Interferometer Coated with Pt by Iron Sputtering Technology

A new deflection solution and application of a fiber Bragg grating-based inclinometer for monitoring internal displacements in slopes

An FBG sensor for strain and temperature discrimination at cryogenic regime

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