%0 Journal Article
%T Temperature-independent torsion sensor based on ˇ°figure-of-eightˇ± fiber loop mirror
%A Ricardo M. Silva
%A Ant¨®nio B. Lobo Ribeiro
%A Orlando Fraz o
%J Photonic Sensors
%@ 2190-7439
%D 2013
%I 
%R 10.1007/s13320-012-0082-3
%X An interrogation sensor system combining the ˇ°figure-of-eightˇ± fiber loop mirror using a single directional 3ˇÁ3 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 3ˇÁ3 coupler. Splicing the output ports of the 3ˇÁ3 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 7.9ˇÁ10 4 degree/dB. The performance of the sensor was not affected by environmental temperature variations.
%K Torsion sensor
%K fiber loop mirror
%K interferometer
%U http://link.springer.com/article/10.1007/s13320-012-0082-3