A micro MMF layer embedded in LPFG for simultaneous measurement of curvature and temperature

Sun, Cuiting; Han, Zhihang; Zhang, Shuo; Duan, Shukai; Jin, Xiren; Chen, Xudong; Yao, Chong; Geng, Tao; Zhang, Zhilin; Qu, Zhongquan; Sun, Weimin; Yuan, Libo

doi:10.1016/j.yofte.2018.12.007

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…Fiber Bragg grating [8,9] (FBG) and long-period ber grating (LPFG) sensors are widely used in curvature sensing, such as sensors engraved in the center core FBG of a seven-core optical ber [10] , with a curvature sensitivity of -7.27 dB/m − 1 in the curvature range of 0 m − 1 to 1 m − 1 . The maximum sensitivity of the curvature sensor of the proposed LPFG and multi-mode ber (MMF) spliced into the LPFG-MMF-LPFG structure is -21.08 nm/m − 1 (0.246 m − 1 to 0.738 m − 1 ) [11] and the maximum temperature sensitivity of 60 pm/°C. However, the curvature measurement range of the applied encoder is small, limiting its application in a wide range of elds.…”

Section: Introductionmentioning

confidence: 99%

Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer

Chen,

Su,

Gong

et al. 2024

Appl. Phys. B

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A compact ber-optical curvature sensor based on the hollow-core ber (HCF) assisted microbubble Mach-Zehnder interferometer (HMZI) is proposed and experimentally demonstrated. Transmission spectral characteristics of the proposed curvature sensor have been investigated with a maximum intensity-interrogated sensitivity of -1.48 dB/m − 1 in a curvature range from 1.22 m − 1 to 3.46 m − 1 . The temperature-induced instability is measured below 0.30 dB in a large temperature range of 35°C to 60°C, suggesting a good temperature resistance performance. The overall sensing size is controlled to be around 600 µm. Hence, the HMZI curvature sensor has several desirable merits such as wide measurement range, temperature insensitivity, and ease of integration, which make it a promising candidate in curvature-related mechanical engineering and structural health monitoring applications.

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Section: Introductionmentioning

confidence: 99%

Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer

Chen,

Su,

Gong

et al. 2024

Appl. Phys. B

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“…Among these parameters, temperature is an essential variable that needs to be monitored in almost all manufacturing processes and laboratory experiments. A large number of fiber optic temperature sensors have been assembled using tapered fiber [ 6 ], photonic crystal fiber [ 7 ], fiber Bragg grating (FBG) [ 8 ], long-period fiber grating (LPFG) [ 9 ], and multimode interference [ 10 ]. Moreover, fiber optic interferometers such as Mach–Zehnder [ 11 ], Fabry–Pérot (FP) [ 12 ], and Sagnac [ 13 ] have also been fabricated for temperature measurement.…”

Section: Introductionmentioning

confidence: 99%

In-Line Mach–Zehnder Interferometers Based on a Capillary Hollow-Core Fiber Using Vernier Effect for a Highly Sensitive Temperature Sensor

Marrujo-García

Hernández-Romano

May-Arrioja

et al. 2021

Sensors

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In this paper, we propose a highly sensitive temperature sensor based on two cascaded Mach–Zehnder interferometers (MZIs) that work using the Vernier effect. The all-fiber MZIs were assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two sections of multimode fibers (MMFs). This cascaded configuration exhibits a temperature sensitivity of 1.964 nm/°C in a range from 10 to 70 °C, which is ~67.03 times higher than the sensitivity of the single MZI. Moreover, this device exhibits a high-temperature resolution of 0.0153 °C. A numerical analysis was carried out to estimate the devices’ temperature sensitivity and calculate the magnification of the sensitivity produced by the Vernier effect. The numerical results have an excellent agreement with the experimental results and provide a better insight into the working principle of the MZI devices. The sensor’s performance, small size, and easy fabrication make us believe that it is an attractive candidate for temperature measurement in biological applications.

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“…An alternate approach is to use different sensing mechanism for temperature and curvature. Some structures are reported, such as three-core fiber [17], two-core fibers (TCF) [18], seven-core fiber [19], LPFG [20]. However, these special fibers increases the fabrication complexity and the cost of the sensor system.…”

Section: Introductionmentioning

confidence: 99%

In-Line Hybrid Fiber Sensor for Curvature and Temperature Measurement

Cheng

Wang

et al. 2019

IEEE Photonics J.

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We proposed and demonstrated a compact inline optical fiber sensor for curvature and temperature measurement with low cross sensitivity. The device consists of a 5 mm long hollow-core fiber (HCF) spliced between two single-mode fibers. Two up-tapers were fabricated at each splicing joint forming a Mach-Zehnder Interferometer (MZI). The HCF acted as the anti-resonant reflecting optical waveguide (ARROW), giving periodic dips at resonant wavelengths in the optical transmission spectrum. The cross sensitivity of curvature and temperature problem is solved by demodulating the wavelength shift of the MZI for temperature sensing and intensity variation of ARROW dips for curvature sensing. The curvature and temperature sensitivities are experimentally measured to be −4.28 dB/m −1 and 25.76 pm/°C, respectively. The cross sensitivities for ARROW is measured to be 0.0056 m −1 /°C. The structure of the sensor is simple and compact, which can be used for structural health monitoring in a complex environment.

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A micro MMF layer embedded in LPFG for simultaneous measurement of curvature and temperature

Cited by 11 publications

References 19 publications

Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer

Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer

In-Line Mach–Zehnder Interferometers Based on a Capillary Hollow-Core Fiber Using Vernier Effect for a Highly Sensitive Temperature Sensor

In-Line Hybrid Fiber Sensor for Curvature and Temperature Measurement

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