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Systems and methods for stabilizing optical shape sensing

A technology for stabilizing and sensing data, applied in the direction of using optical devices, instruments for radiological diagnosis, optics, etc., can solve problems such as instability of backscattering patterns

Active Publication Date: 2018-06-19
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can also alter the backscatter pattern from the fiber and cause instability

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  • Systems and methods for stabilizing optical shape sensing
  • Systems and methods for stabilizing optical shape sensing
  • Systems and methods for stabilizing optical shape sensing

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Embodiment Construction

[0021] In accordance with the principles of the present invention, systems and methods for robust shape sensing are disclosed. Instability in shape sensing is a major problem and can arise for different reasons. A few examples of causes of unstable shape sensing may include: loss of laser alignment, phase tracking failure, loss of correlation between the reference arm and the sampling arm, motion close to the limit of the emission area, improper Proper alignment, temperature changes (ambient as well as sharp local temperatures), local pressure / stress leading to loss of original geometry of any of the cores, high twisting / winding (e.g. multiple π-turns about the axis of the fiber ), high curvature, vibration, axial tension, etc. Embodiments of the invention provide methods for detecting and correcting incorrect shapes during shape sensing. Wrong shapes can be ruled out when correction is not possible (eg due to lack of phase tracking). This embodiment overcomes the limitatio...

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Abstract

A system and method for shape sensing using an optical fiber includes collecting (610) shape data from a shape sensing fiber optic device. The shape data is inspected (620) to determine data locations that exceed an acceptable threshold based on a geometric expectation of the shape data. Rejecting (640) said shape data corresponding to said data locations exceeding an acceptable threshold. The acceptable shape data is plotted (650) to provide a stable shape sensing data set.

Description

technical field [0001] The present disclosure relates to shape sensing instruments, and more particularly to systems and methods for shape sensing optical fibers with improved stability. Background technique [0002] Fiber optic based shape sensing exploits the inherent backscatter in conventional optical fibers. The principle consists of using the characteristic Rayleigh scattering pattern to use distributed strain measurements in optical fibers. [0003] The physical length and refractive index of fibers are inherently sensitive to environmental parameters, temperature and strain, and much less sensitive to pressure, humidity, electromagnetic fields, chemical exposure, and the like. The wavelength shift Δλ or frequency shift Δv of the backscatter pattern due to temperature change ΔT or strain ε along the fiber axis is: Δλ / λ=-Δv / v=K T ΔT+K ε ε, where [0004] Temperature Coefficient K T is the coefficient of thermal expansion and thermo-optic coefficient and , wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/107G02B6/02G01B11/16
CPCA61B5/0059A61B5/055A61B5/1076A61B5/1079A61B5/7221A61B6/5247G01B11/16G01B11/18G01B11/24G01B21/04G02B6/02076
Inventor B·拉马钱德兰R·曼茨克R·陈
Owner KONINKLJIJKE PHILIPS NV