Vibration measurement system of dual-path detection based on Michelson interferometer

Jing Liang; Jun Zhu; Chao Jiang; Fei Ai; Miaomiao Shi; Bo Zhang; Benli Yu

doi:10.1117/12.838119

23 November 2009 Vibration measurement system of dual-path detection based on Michelson interferometer

Jing Liang, Jun Zhu, Chao Jiang, Fei Ai, Miaomiao Shi, Bo Zhang, Benli Yu

Proceedings Volume 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 75081A (2009) https://doi.org/10.1117/12.838119
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

Based on the Michelson interferometer, we use the circulator to realize the dual-path detection of the vibration signal, which reduce the intensity noise caused by laser source. Reflectors are connected to the terminal of the signal arm and reference arm respectively. The phase generated carrier (PGC) technology should use piezoelectric ceramic (PZT) to generate carrier signal with high frequency in traditional demodulation techniques. Whereas the PZT is sensitive to the external environment changing, so accuracy of vibration measurement will fall down, in order to solve this problem the fiber waveguide modulator was used in the system instead of PZT. Then we use arctangent algorithm instead of PGC algorithm to demodulate the signals, which could greatly simplify the algorithm. The output of the signals are input into the computer through the data acquisition card and then demodulated by arctangent algorithm compiled by Labview. Theoretical analysis and experimental prove the phase orthogonality of the two output signals, the amplitude and frequency of the vibration signal can be detected at the same time. The Experiment results indicate that the system can demodulate the vibration signal accurately.

Citation Download Citation

Jing Liang, Jun Zhu, Chao Jiang, Fei Ai, Miaomiao Shi, Bo Zhang, and Benli Yu "Vibration measurement system of dual-path detection based on Michelson interferometer", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 75081A (23 November 2009); https://doi.org/10.1117/12.838119

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