Temperature independent torsion sensor using a high-birefringent Sagnac loop interferometer |
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| Authors: | Ricardo M Silva Marta S Ferreira Orlando Frazão |
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| Institution: | 1. State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang, 110819, China;2. College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China;1. Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia;2. School of Electronic and Optical Engineering, College of Microelecronics, Nanjing University of Posts and Telecommunications Xianlin Campus, 163 Xianlin Road, Qixia District, Nanjing, Jiangsu 210023, China;1. Departamento de Ingeniería Electrónica, División de Ingenierías, Campus Irapuato-Salamanca, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago Km 3.5+1.8 Km, Comunidad de Palo Blanco, Salamanca, Gto. C.P. 36885, Mexico;2. Departamento de Mecatrónica, Universidad Tecnológica de Salamanca, Av. Universidad #200, Col. Ciudad Bajio, Salamanca, Gto. C.P. 36766, Mexico;3. Departamento de Estudios Multidisciplinarios, División de Ingenierías Campus Irapuato-Salamanca, Universidad de Guanajuato, Av. Universidad S/N, Col. Yacatitas, Yuriria, Gto. C.P. 38940, Mexico |
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| Abstract: | A high-birefringent (Hi-Bi) Sagnac loop interferometer for torsion measurement is demonstrated. The sensing head is formed by a section of standard single mode fiber spliced between the output ports of a Hi-Bi coupler at 3 dB. The sensing configuration is characterized in torsion, temperature and strain. The results obtained indicate the viability of a torsion sensor independent of the temperature and strain cross-sensitivity effects. Additionally, in the proposed configuration all measurements are performed without the need of a polarization controller, a device most often required in standard Sagnac loops applied for sensing. |
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