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Proceedings Paper

Measurement of machinery vibration using laser mode split technology
Author(s): Shulian Zhang; Lijing Wu; Yan Li; Zhibeng Deng; Chengyun Yin
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Paper Abstract

A novel method of measuring machinery vibration linear or angular is presented. A piece of quartz crystal wedge is put in a HeNe laser cavity, which results in laser mode (frequency) splitting. One mode is split into two frequencies. The difference between the two frequencies, beat frequency, is dependent on the thickness of the wedge in the intracavity laser beam. When the wedge is vibrated, its thickness in the intracavity laser beam is changed, which leads to beat-frequency changing. The variation of beat-frequency represents the amplitude of vibration. Each instantaneous value of the beat-frequency is directly proportional to the displacement of the wedge. A transducer of frequency versus voltage is used to transfer the beat-frequency into a voltage signal which is similar to that capacitance transducers have.

Paper Details

Date Published: 3 January 1996
PDF: 4 pages
Proc. SPIE 2594, Self-Calibrated Intelligent Optical Sensors and Systems, (3 January 1996); doi: 10.1117/12.229242
Show Author Affiliations
Shulian Zhang, Tsinghua Univ. (China)
Lijing Wu, Tsinghua Univ. (China)
Yan Li, Tsinghua Univ. (China)
Zhibeng Deng, Tsinghua Univ. (China)
Chengyun Yin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 2594:
Self-Calibrated Intelligent Optical Sensors and Systems
Anbo Wang, Editor(s)

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