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Instrumentation, Measurement, and Optical Sensing
Ultrasensitive liquid level sensor based on slice-shaped composite long period fiber grating
Xiren Jin
1
Zeju Rui
1
Zihang Xiang
1
Chupeng Lu
1
[ ... ]
Libo Yuan
3
Author Affiliations
Abstract
1
Key Laboratory of In-fiber Integrated Optics, Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China
2
Acoustic Science and Technology Laboratory, College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
3
Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
In this paper, a novel liquid level sensor with ultra-high sensitivity is proposed. The proposed sensor is configured by a slice-shaped composite long period fiber grating (SSC-LPFG). The SSC-LPFG is prepared by polishing two opposite sides of a composite multimode–single-mode–multimode fiber structure using a
CO
2
laser. The method improves the sensitivity of the sensor to external environment. Based on the simulation calculation, a liquid level sensor with a length of 3 mm is designed. The experimental transmission spectrum agrees well with the simulation result. The experimental results show that the sensitivity reaches 7080 pm/mm in the liquid level range of 0–1400 μm in water. The temperature sensitivity is 24.52 pm/°C in the range of 20°C–90°C. Due to the ultra-high sensitivity, good linearity, and compact structure, the SSC-LPFG has potential application in the field of high-precision liquid level measurement.
liquid level sensor
composite long period fiber grating
ultra-high sensitivity
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Chinese Optics Letters
2022, 20(1): 011202
Instrumentation, Measurement, and Optical Sensing
Highly sensitive torsion sensor based on triangular-prism-shaped long-period fiber gratings
Download:677次
Senyu Wang
1
Yiwei Ma
1
Xiaoyang Li
1
Yang Yi
1
[ ... ]
Libo Yuan
2
Author Affiliations
Abstract
1
College of Science, Harbin Engineering University, Harbin 150001, China
2
Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
We propose and investigate a compact optical fiber sensor that aims to measure the torsion in both amount and direction with high sensitivity. This sensor is configured by a triangular-prism-shaped long-period fiber grating, which is fabricated by the high frequency
CO
2
laser polished method. The unique design of the triangular-shaped structure breaks the rotational symmetry of the optical fiber and provides high sensitivity for torsion measurement. In preliminary experiments, the torsion response of the sensor achieves a good stability and linearity. The torsion sensitivity is 0.54 nm/(rad/m), which renders the proposed structure a highly sensitive torsion sensor.
long-period fiber grating
torsion sensor
CO2 laser etched method
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Chinese Optics Letters
2021, 19(4): 041202
Optical Sensing, Measurements, and Metrology
A new phase-shifted long-period fiber grating for simultaneous measurement of torsion and temperature
Download:786次
Cuiting Sun
1
Ran Wang
1
Xiren Jin
1
Zemin Wang
1
[ ... ]
Libo Yuan
3
Author Affiliations
Abstract
1
Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
2
Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
3
Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
A novel phase-shifted long-period fiber grating (PS-LPFG) for the simultaneous measurement of torsion and temperature is described and experimentally demonstrated. The PS-LPFG is fabricated by inserting a pre-twisted structure into the long-period fiber grating (LPFG) written in single-mode fiber (SMF). Experimental results show that the torsion sensitivities of the two dips are ?0.114 nm/(rad/m) and ?0.069 nm/(rad/m) in the clockwise direction, and ?0.087 nm/(rad/m) and ?0.048 nm/(rad/m) in the counterclockwise direction, respectively. The temperature sensitivities of the two dips are 0.057 nm/°C and 0.051 nm/°C, respectively. The two dips of the PS-LPFG exhibit different responses to torsion and temperature. Simultaneous measurement of torsion and temperature can be implemented using a sensor. The feasibility and stabilization of simultaneous torsion and temperature measurement have been confirmed, and hence this novel PS-LPFG demonstrates potential for fiber sensing and engineering applications.
phase-shifted long-period fiber grating
pre-twisted structure
single-mode fiber
simultaneous measurement
torsion
temperature
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Chinese Optics Letters
2020, 18(2): 021203
Fiber Optics and Optical Communications
A polarization-independent torsion sensor based on the near-helical long period fiber grating
Download:839次
Zhihang Han
1
Cuiting Sun
1
Xiren Jin
1
Hang Jiang
1
[ ... ]
Libo Yuan
3
Author Affiliations
Abstract
1
College of Science, Harbin Engineering University, Harbin 150001, China
2
School of Physics and Technology, University of Jinan, Jinan 250022, China
3
Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
A torsion sensor based on the near-helical (NH) long period fiber grating (LPFG) is fabricated by using a high frequency pulsed CO
2
laser. Each groove of the NH-LPFG is spirally written in the four sides of a single-mode fiber. The NH-LPFG has a helical periodic vertical index modulation. This is different from the screw-type index modulation of the common helical LPFGs (H-LPFGs) fabricated in a twisted fiber. The torsion and temperature characteristics of the NH-LPFG are experimentally investigated. The temperature sensitivity is about 0.0668 nm/°C. The torsion sensitivity is 0.103 nm/(rad/m) and independent of the polarization state of incident light.
060.2430
Fibers, single-mode
060.2370
Fiber optics sensors
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Chinese Optics Letters
2018, 16(10): 100601
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