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Fiber optic birefringence enhanced accelerometer based on polarized modal interferometer
摘要： An inline fiber optic birefringence enhanced accelerometer (FOBEA) which applies one polarizer and a ten-meter high birefringence fiber wrapped on a transducer cylinder is proposed. Birefringence of polarized modes in panda polarization maintaining fiber (PMF) is enhanced by fiber coating and cylinders of different parameters. Accelerometers with copper cylinder (FOBEA-1) and polyurethane cylinder (FOBEA-2) are fabricated, the tested average sensitivities are 1.06rad/g (20-3800 Hz) and 16.97 rad/g (20-2000 Hz). The experimental results show the birefringence gain of FOBEA-1 is in good consistent with theoretical calculation of 1.07 and an additional birefringence gain of FOBEA-2 is 5.52 because the polyurethane cylinder works as fiber coating with the thickness of 1.21 mm. Temperature crosstalk is also investigated.
关键词： Polarized modal interferometer,Fiber optic accelerometer,Sensitivity,Transducer cylinder,Birefringence gain
更新于2025-11-28 14:23:57
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Study of a large lateral core-offset in-line fiber modal interferometer for refractive index sensing
摘要： A large lateral core-offset in-line fiber modal interferometer was proposed in order to avoid the relative direction of the two core-offset joints affecting the interference performance. The RI sensing performances of the interferometers with different arm lengths were evaluated and compared with the small core-offset ones. The simulation and experimental results showed that the power remaining in the core mode decreased from 25 to 0.002% after the input light passing through the first core-offset joint as the core-offset displacement increased from 6 to 40 μm. Thus, the interference between the core mode and cladding mode within the enlarged core-offset interferometer was suppressed, and meanwhile the interference within the cladding modes was dominated. As the core-offset displacement was simply enlarged from 6 to 40 μm, the RI sensitivity was greatly improved from 43.97 to 123.40 nm/RIU. The proposed sensor is a cost-effective solution for RI sensing purpose, and exhibits the advantages of high sensitivity, simple structure and easy fabrication with only a fusion splicer.
关键词： Fiber modal interferometer,Core-offset,Optical fiber sensor,Refractive index measurement
更新于2025-09-23 15:22:29
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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) - Fiber optic planar accelerometer based on modal interferometer
摘要： A fiber optic planar accelerometer for low frequency micro-vibration detection is proposed. The measured sensitivity, resolution and directional crosstalk are 227.82 mV/g, 12.54 μg/√Hz and -45.88 dB (8-100 Hz). The temperature crosstalk is -0.5 nm/°C.
关键词： crosstalk,fiber optic accelerometer,modal interferometer
更新于2025-09-16 10:30:52
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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) - A Highly Sensitive Liquid-Level Modal Sensor Utilizing Thin-Core Fiber
摘要： An optical modal interferometer based on thin-core fiber (TCF) is proposed and demonstrated. Experimental results show that the wavelength shift sensitivity is -0.124 nm/mm within the measurement range of 15mm.
关键词： Liquid-level sensing,Thin-core fiber,Modal interferometer
更新于2025-09-16 10:30:52