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An optical fiber strain sensor by using of taper based TCF structure
摘要： We propose an optical fiber strain sensor consisting of a spliced twin-core fiber (TCF). The sensor structure has two fiber tapers, which are weak taper and T-shaped taper. The taper waist of T-shaped taper is about half-size of the weak taper, but the length of the T-shaped taper is also about half-length of the weak taper. In the sensing structure, core mode and cladding modes of the TCF are excited simultaneously. Two tapered regions around the splicing interfaces can play the roles of splitting and combining the modes in the fiber. In experiment, the proposed device has good quality interferometric spectra, and the highest extinction ratio of 20 dB is achieved. When the stress increases from 0 με to 841.5 με, different wavelength sensitivities of 3.31 pm/με and 6.11 pm/με are achieved. Different intensity sensitivities of 7.5 × 10?3 dB/με and 9.9 × 10?3 dB/με are also achieved, respectively. The sensor has shown good test stability and low temperature sensitivity, which is good for precise strain measurement in practical applications.
关键词： Twin-core fiber,Fiber design and fabrication,Fiber optical sensor
更新于2025-11-28 14:23:57
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Curvature Sensing Based On The Reflection Spectrum Of A Hybrid-Structure Fiber Sensor
摘要： curvature measurement of and Simultaneous temperature by monitoring the transmission spectrum of a hybrid-structure fiber sensor which consists of two peanut-shape structures and a FBG is proposed in this paper. Besides the transmission spectrum, reflection spectrum of this hybrid-structure sensor can also be used for the curvature measurement. Unlike the wavelength the demodulation of intensity reflection demodulation has an evident advantage that we can realize the measurement of curvature by using a relatively simple optical power meter instead of an elaborate and expensive OSA in practical application, which can reduce the cost well.
关键词： Fiber optical sensor,Fiber Bragg grating,Simultaneous measurement
更新于2025-09-16 10:30:52
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Design of terahertz spectroscopy based optical sensor for chemical detection
摘要： In this article, a new design of circular cladding with a rotated-hexacore in photonic crystal fiber (RH-CPCF) has been suggested for chemical sensing application in the THz regime. The five layers circular cladding and two layers rotated-hexacore in circular shape are designed here. All numerical results are obtained with a procedure of finite element method and perfectly match layered boundary condition in terahertz (THz) wave propagation. After the simulation result, the proposed RH-CPCF shows the high relative sensitivity is 76.44%, 77.16% and 73.20% for three chemicals such as Ethanol (n = 1.354), Benzene (n = 1.366) and Water (n = 1.330) at 1 THz. On the other hand, the low confinement losses are 2.33 × 10?03 dB/m, 3.07 × 10?06 dB/m and 2.84 × 10?02 dB/m for same in three chemicals at 1 THz. Moreover, effective area, effective mode index and total power fraction in core air holes are also briefly described here. In addition, this proposed circular photonic crystal fiber (RH-CPCF) can be used especially for chemical sensing in biomedical, industrial quality control, material research, micro-optics and many communication applications in THz technology.
关键词： Terahertz sensor,Sensitivity,Optical loss profile,Photonic crystal fiber,Optical sensor,FEM based analysis
更新于2025-09-12 10:27:22