Novel Multi-mode Fiber Sensor by Applying Torsional angle tuning

摘要

The linear fiber sensor of torsional angle with biderectional tuning has been designed and realized by using multi-mode fiber and torsion beam. The optical power loss of the multi-mode fiber is linear to the torsional angle of the torsion beam under the torsional strain is not large. In the range between -40 and +40 , we obtained that the sensitivity of the torsional angle is 0.376dB/degree for positive torsion and -0.374dB/degree for negative torsion, respectively. The experimental results are good agreement with the theoretical analyses.