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Proceedings Paper

Grating vibration sensor with digital direction identification
Author(s): Jingchang Zhuge; Zhoumo Zeng; Shuqing Li; Yu Zhang; Xianglin Zhan
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Paper Abstract

In this paper, a new method of direction identification in digital signal processing for seismic wave is introduced. Traditional direction identification method is replaced by a new digital direction identification method without making use of direction identification circuit. For judging whether the direction of vibration changes or not, the relative differences of the amplitude ratio and frequency change of Moire fringe signals at the turning points are two main determining conditions. According to the characteristics of current Moire fringe signals, we can predict the range of relative differences of the amplitude ratio and frequency change of Moire fringe signals at the next turning point. If the Moire fringe signals satisfy any one of two conditions, the possibility of vibration direction changed is extremely large. In order to avoid misinformation, the determination of vibration direction will be made after the confirmation process. Once the change of vibration direction is determined, the turning point will be picked out accurately. Experiments result shows that the solution has advantages of high resolution, high precision, wide dynamic range and low error.

Paper Details

Date Published: 14 November 2007
PDF: 6 pages
Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 672248 (14 November 2007); doi: 10.1117/12.783650
Show Author Affiliations
Jingchang Zhuge, Tianjin Univ. (China)
Tianjin Univ. of Science and Technology (China)
Zhoumo Zeng, Tianjin Univ. (China)
Shuqing Li, Tianjin Univ. of Science and Technology (China)
Yu Zhang, Tianjin Univ. (China)
Xianglin Zhan, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 6722:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies

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