3 January 1996 Measurement of machinery vibration using laser mode split technology
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shulian Zhang, Shulian Zhang, Lijing Wu, Lijing Wu, Yan Li, Yan Li, Zhibeng Deng, Zhibeng Deng, Chengyun Yin, Chengyun Yin, "Measurement of machinery vibration using laser mode split technology", Proc. SPIE 2594, Self-Calibrated Intelligent Optical Sensors and Systems, (3 January 1996); doi: 10.1117/12.229242; https://doi.org/10.1117/12.229242


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