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A load cell using a fiber Bragg grating with inherent mechanical temperature compensation
Author(s) -
Nakamura Kentaro,
Matsumura Toshiyuki,
Ueha Sadayuki
Publication year - 2005
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.74
Subject(s) - fiber bragg grating , materials science , grating , optics , compensation (psychology) , finite element method , blazed grating , sensitivity (control systems) , optical fiber , load cell , structural engineering , wavelength , diffraction grating , optoelectronics , electronic engineering , engineering , physics , psychology , psychoanalysis
This study proposes a load cell that uses an optical fiber Bragg grating to meet the demands for multipoint force measurements. The load cell is based on the shift in the center wavelength of the fiber grating that occurs due to longitudinal strain. The present load cell consists of an octagonal metal frame, two resin arms fixed to the frame and an optical fiber Bragg grating bonded on the arms. Compressive vertical load applied to the frame is transformed to horizontal tensile stress that acts on the fiber grating. The frame and arms have different thermal coefficients in order to compensate for the temperature sensitivity of the fiber grating. This paper first describes the control of the sensitivity and the compensation of the temperature dependence. Second, the undesirable responses to shear and torsional forces are discussed on the basis of applying the finite element method. The performance of a prototype load cell is experimentally demonstrated and the operation principles were confirmed. Copyright © 2005 John Wiley & Sons, Ltd.