Temperature-Independent Torsion Sensor Based on ＂Figure-of-Eight＂ Fiber Loop Mirror  

作　　者：Ricardo M. SILVA António B. Lobo RIBEIRO Orlando FRAZAO 

机构地区：[1]INESC Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal, Departamento de Fisica da Faculdade de Cidnciasda Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal [2]Faculty of Health Sciences, University Fernando Pessoa, R. Carlos da Maia 296, 4200-150 Porto, Portugal

出　　处：《Photonic Sensors》2013年第1期52-56,共5页光子传感器（英文版）

摘　　要：An interrogation sensor system combining the ＂figure-of-eight＂ fiber loop mirror using a single directional 3×3 fiber optic coupler was proposed. One fiber loop mirror was formed by inserting a length of high birefringent optical fiber at the input ports of the 3×3 coupler. Splicing the output ports of the 3×3 coupler between them created the other fiber loop mirror. The introduction of this second loop gave rise to two polarization states of light with the same frequency but different optical phase. The mechanical torsion sensing head was located at the second loop and was exhibited an average modulus torsion sensitivity of 7.9×10^-4 degree/dB. The performance of the sensor was not affected by environmental temperature variations. Keywords： Torsion sensor, fiber loop mirror, interferometer

关 键 词：Torsion sensor fiber loop mirror INTERFEROMETER 

分 类 号：TN722.32[电子电信—电路与系统] TP212[自动化与计算机技术—检测技术与自动化装置]