Abstract

Optical fiber shape sensing technology provides an excellent solution for the tracking and guiding of minimally invasive surgical instruments. However, when some large-deformed instrument operation tasks are involved, restricted by the operating environment, a significant torsion will be produced by the curved structure of the instrument, posing a threat to the accuracy of its shape reconstruction notably. In this paper we propose and experimentally illustrate a new distributed curvature and torsion measurement method based on optical frequency domain reflectometer using helical multi-core fibers. A theoretical model of total strain induced by the bending and torsion is established. Two diverse means of inverse algorithms to decouple bending and torsion are explored. The experimental results of two methods demonstrated that the torsion measurement errors are around 6.6% and 7.3%.

Separation method of bending and torsion in shape sensing based on FBG sensors array

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Opt. Express 32(5) 6929-6944 (2024)

Intensity modulated torsion sensor based on optical fiber reflective Lyot filter

Bo Huang, Xuewen Shu, and Yueqing Du
Opt. Express 25(5) 5081-5090 (2017)