Device for detecting three-dimensional shapes of elongated flexible body
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United States of America Patent
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Mar 15, 2005
Grant Date -
Aug 26, 2004
app pub date -
Feb 19, 2004
filing date -
Feb 20, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
For detecting three-dimensional shapes of an elongated flexible body, a sensor cable to be placed in a passage or channel which is formed axially and coextensively within the elongated flexible body. The sensor cable has two pairs of fiber Bragg grating strands within a tubular carrier casing. A signal light beam containing Bragg wavelength bands is projected from a light source to input same to refractive index change portions in the fiber Bragg grating strands. Reflection diffraction light signals from the refractive index change portions are received by a signal processor to measure the degree of strain at each one of the respective refractive index change portions by comparing wavelengths of the reflection diffraction light signals with reference wavelength.
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