Helical-Fiber Position Detection Rope for 3D Motion and Torsion
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Solution Overview
Problem
Existing optical fiber sensors are not modularized, lack reliability as industrial products, and cannot perform torsion measurement or measure three-dimensional displacement of large-scale objects.
Innovation Solution
A distributed position detection rope comprising optical fibers, tensile strength bodies, and sheath materials, with helically wound optical elements on different axes to enable modularization and measure three-dimensional displacement and torsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fiber sensors are made modularized with helical winding structure, then mass production and reliability are improved, but device complexity increases
Solution Approach 1:
The optical fiber sensor is divided into multiple modular units, each consisting of an optical fiber and a helical winding structure. These modular units can be independently manufactured and assembled, enabling mass production while maintaining reliability. The segmentation allows for standardized manufacturing processes and quality control.
Solution Approach 2:
The optical fiber is nested within the helical winding structure, which is itself nested within a protective sheath. This nested configuration integrates multiple functions (sensing, structural support, protection) into a compact modular unit, reducing overall device complexity while enabling industrial production.
2Adaptability or versatility
If multiple optical fibers are arranged helically on different axes, then measurement of three-dimensional displacement and torsion is enabled, but device complexity increases
Solution Approach 1:
The patent transitions from single-axis optical fiber arrangement to multi-axis helical winding configuration. By arranging optical fibers helically on different axes with different winding directions, the system gains the ability to measure three-dimensional displacement and torsion simultaneously, adding measurement dimensions without proportionally increasing complexity.
Solution Approach 2:
The helical winding structure with multiple optical fibers serves multiple measurement functions simultaneously - it can detect bending, torsion, and three-dimensional displacement through a unified structure. This multi-functionality reduces the need for separate sensing elements for each measurement type, thereby limiting complexity increase.
3Measurement precision
If optical fibers are physically associated with target objects for strain measurement, then measurement precision is improved, but the system cannot measure torsion or three-dimensional displacement
Solution Approach 1:
The helical winding structure introduces dynamic response characteristics that enable the sensor to detect not only static strain but also dynamic deformations including torsion and three-dimensional displacement. The helical geometry transforms various types of mechanical deformation into measurable strain patterns in the optical fiber, expanding the measurement scope while maintaining precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate measurement of three-dimensional displacement and torsion in large-scale objects through modularized optical fiber sensors, facilitating mass production and improved sensitivity.
Implementation Method 1
basic optical elements each including an optical fiber for measuring a physical quantity
Implementation Method 2
using frequency change or phase change of Brillouin scattering or Rayleigh scattering which is backscatter light of a pulse laser beam entering the optical fibers
Implementation Method 3
using frequency change or phase change of Brillouin scattering or Rayleigh scattering which is backscatter light of a pulse laser beam entering the optical fibers
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A distributed position detection rope (100, 101) includes: basic optical elements (5) each including an optical fiber (1), tensile strength bodies (2), and a sheath material (3) and the tensile strength bodies (2); a cylindrical inner sheath layer (8b) having a first optical element (5a) formed by arranging a plurality of the basic optical elements (5) which are arranged at positions on the same circle and are helically wound at a predetermined pitch along the axial direction of the axis; and a cylindrical outer sheath layer (9) on the outer side of the inner sheath layer (8b) and having a second optical element (5b) which are arranged at positions on the same circle and are helically wound along the axial direction so as to have a placement angle different from that of the basic optical elements (5) of the first optical element (5a).