Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7455
Title: Very sensitive fiber Bragg grating accelerometer using transverse forces with an easy over-range protection and low cross axial sensitivity
Authors: Li, K
Chan, THT
Yau, MH
Nguyen, T
Thambiratnam, DP
Tam, HY 
Issue Date: 2013
Publisher: Optical Society of America
Source: Applied optics, 2013, v. 52, no. 25, p. 6401-6410 How to cite?
Journal: Applied optics 
Abstract: The first fiber Bragg grating (FBG) accelerometer using direct transverse forces is demonstrated by fixing the FBG by its two ends and placing a transversely moving inertial object at its middle. It is very sensitive because a lightly stretched FBG is more sensitive to transverse forces than axial forces. Its resonant frequency and static sensitivity are analyzed by the classic spring-mass theory, assuming the axial force changes little. The experiments show that the theory can be modified for cases where the assumption does not hold. The resonant frequency can be modified by a linear relationship experimentally achieved, and the static sensitivity by an alternative method proposed. The principles of the over-range protection and low cross axial sensitivity are achieved by limiting the movement of the FBG and were validated experimentally. The sensitivities 1.333 and 0.634 nm/g were experimentally achieved by 5.29 and 2.83 gram inertial objects at 10 Hz from 0.1 to 0.4 g (g = 9.8× m/s2), respectively, and their resonant frequencies were around 25 Hz. Their theoretical static sensitivities and resonant frequencies found by the modifications are 1.188 nm/g and 26.81 Hz for the 5.29 gram one and 0.784 nm/g and 29.04 Hz for the 2.83 gram one, respectively.
URI: http://hdl.handle.net/10397/7455
ISSN: 1559-128X
EISSN: 2155-3165
DOI: 10.1364/AO.52.006401
Appears in Collections:Journal/Magazine Article

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