Metal Embedded Fiber Bragg Grating Sensors in Layered Manufacturing

[+] Author and Article Information
Xiaochun Li

Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706e-mail: xcli@engr.wisc.edu

Fritz Prinz

Departments of Mechanical Engineering and Materials Science and Engineering, Stanford University, California 94305-3030e-mail: fbp@cdr.stanford.edu

J. Manuf. Sci. Eng 125(3), 577-585 (Jul 23, 2003) (9 pages) doi:10.1115/1.1581889 History: Received April 01, 2002; Revised November 01, 2002; Online July 23, 2003
Copyright © 2003 by ASME
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A schematic representation of a Fiber Bragg Grating
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Explosive view of embedding sequence
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Embedded optical fiber with good bonding
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Characterization of strain response of bare FBGs
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Characterization of thermal response of bare FBGs
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Strain response of Ni-coated FBGs
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Thermal response for Ni-coated FBGs
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Two FBGs for decoupling of temperature and strain effects
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Calibration of decoupling sensor under thermal and axial strain loads (a) Under axial Stress (b) Under Thermal load
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Setup of four-point bending test and cross section of the beam
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Elastic response from embedded FBG and strain gauge
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Measured strain (corrected from the strain gauge for the FBG location) versus FBG wavelength shifts
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Wavelength shifts in response to strains in the plastic regime
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Thermal response of embedded FBG in stainless steel structure
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Residual strains monitoring by use of embedded FBG
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Path sets of the laser cladding on the stainless steel beam
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Wavelength shifts induced by residual strains during laser cladding




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