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Proceedings Paper

Development of a tri-axial optical accelerometer using two DVD pick-up heads
Author(s): Chih-Liang Chu; Hong-Wei Liao
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Paper Abstract

This study develops a low-cost, highly-sensitive, three-dimensional optical accelerometer in which the seismic mass comprises four rectangular blocks attached to the ends of a cross-form aluminum structure suspended on four thin steel strips. It is shown through ANSYS finite element (FE) simulations that the thin-strip suspension system restricts the seismic mass to just three degrees of motional freedom, namely one translational motion in the vertical direction and two rotational motions. These displacements are detected using two novel optical sensors based on commercial DVD optical pick-up heads. When the accelerometer experiences a vibrational force, the relative motion between the seismic mass and the base results in a change in the distribution of the reflected light spots on the surfaces of the four-quadrant photodetectors within the two pick-up heads. The resulting changes in the output voltage signals of the two pick-up heads are then used to calculate the corresponding acceleration of the base. The experimental results indicate that the resonance frequencies of the accelerometer in the X, Y and Z-axis directions are 130.51 Hz, 130.63 Hz and 130.90 Hz, respectively. Meanwhile, the sensitivities of the accelerometer in the X, Y and Z-axis directions are 21.28 V/g, 22.94 V/g and 22.75 V/g, respectively.

Paper Details

Date Published: 31 December 2008
PDF: 6 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 713034 (31 December 2008); doi: 10.1117/12.819671
Show Author Affiliations
Chih-Liang Chu, Southern Taiwan Univ. (Taiwan)
Hong-Wei Liao, Southern Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)

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