Three-dimensional position measurement system
First Claim
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1. A three-dimensional position measurement system comprising:
- a connecting body including;
an cylindrical inner tube;
a tubular optical-fiber installation layer provided so as to cover an outer circumferential surface of the inner tube; and
four or more optical fibers installed helically at predetermined pitches in the optical fiber installation layer so as to be deformed in accordance with deformation of the inner tube,a hybrid backscattering measuring module and analyzer unit including;
a backscattering measuring module connected with the four or more optical fibers, the module emitting pulse laser light into the fibers and detecting Brillouin scattered light and Rayleigh scattered light in the optical fibers, to measure a frequency change of the Brillouin scattering and/or, a frequency change of Rayleigh scattering or a phase change of Rayleigh scattering for separately detecting strains and a pressure and a temperature from the frequency changes or the phase change; and
an analyzer calculating respective strain changes due to bend, stretch, and torsion, and a pressure change and/or a temperature change produced in the inner tube from the frequency change of Brillouin scattering, and/or the frequency change of Rayleigh scattering or the phase change of Rayleigh scattering measured with the scattered light measuring module, and determining a three-dimensional position at a given point of the inner tube by analyzing the calculated respective strain changes and the pressure change and/or the temperature change.
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Abstract
A plurality of optical fibers is helically embedded in tubular installation layers on the outer circumferential surface of a shaped body having a circular cross section. A three-dimensional position of the shaped body after deformed produced by bend, torsion, or stretch due to external force is measured by utilizing frequency change or phase change of pulse laser light emitted into the optical fibers caused by Brillouin scattering and/or Rayleigh scattering occurring in the optical fiber deformed in accordance with the shaped body deformation.
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Citations
12 Claims
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1. A three-dimensional position measurement system comprising:
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a connecting body including; an cylindrical inner tube; a tubular optical-fiber installation layer provided so as to cover an outer circumferential surface of the inner tube; and four or more optical fibers installed helically at predetermined pitches in the optical fiber installation layer so as to be deformed in accordance with deformation of the inner tube, a hybrid backscattering measuring module and analyzer unit including; a backscattering measuring module connected with the four or more optical fibers, the module emitting pulse laser light into the fibers and detecting Brillouin scattered light and Rayleigh scattered light in the optical fibers, to measure a frequency change of the Brillouin scattering and/or, a frequency change of Rayleigh scattering or a phase change of Rayleigh scattering for separately detecting strains and a pressure and a temperature from the frequency changes or the phase change; and an analyzer calculating respective strain changes due to bend, stretch, and torsion, and a pressure change and/or a temperature change produced in the inner tube from the frequency change of Brillouin scattering, and/or the frequency change of Rayleigh scattering or the phase change of Rayleigh scattering measured with the scattered light measuring module, and determining a three-dimensional position at a given point of the inner tube by analyzing the calculated respective strain changes and the pressure change and/or the temperature change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification