Device for detecting three-dimensional shapes of elongated...

Details Device for detecting three-dimensional shapes of elongated... Device for detecting three-dimensional shapes of elongated...

2005-03-15

2005-03-15

Palmer, Phan T. H. (Department: 2874)

Optical waveguides

Optical waveguide sensor

C356S073100

Reexamination Certificate

active

06868195

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.

REFERENCES:
patent: 5671307 (1997-09-01), Lauzon et al.
patent: 6307988 (2001-10-01), Eggleton et al.
patent: 6625355 (2003-09-01), Wakabayashi et al.

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