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3-D Shape-Sensing Fiber

Fiber-optic based "smart cable" sensor can precisely determine cable shape, endpoint position, and orientation
Infers the shape of a thin cable from measurements entirely restricted to its interior
Multi-core optical fiber with individual fiber cores constructed to operate in the single mode regime. These fibers are positioned close enough to generate cross-talk (mode coupling) between the cores over the length of the fiber.


Features
No line-of-sight requirement
Measures both position and orientation at any point along the cable
Is immune to many interference sources
Accommodates a range of active volumes and cable lengths
Tracks cable motion at useful rates
Is easily portable
Can potentially have a small cable diameter (for example, < 1 mm)

Applications
Shape measurement of towed acoustic arrays
Precision placement of urban transmission cables and pipelines
Advanced robotics for sensing of body and limb position
Advanced surgical techniques
Guidance for steerable drilling systems
3-D computer input
Spatial registration of sensor data
Computer input devices
Noninvasive surgery
Dynamic array beamforming
Search and rescue