Reprint of: Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration |
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Institution: | 1. Department of Mechanical Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata 992-8510, Japan;2. Karlsruhe Institute of Technology, Institute of Microstructure Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;1. Institute for Materials Research, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;2. NICHe, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;3. Institute of Physics AS CR, Cukrovarnicka 10, Prague 6, 16200, Czech Republic;4. C&A Corporation, 6-6-40 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;1. Wroclaw University of Technology, ul. Z. Janiszewskiego 11/17, PL-50372 Wroclaw, Poland;2. Institute of Electron Technology, Al. Lotników 32/46, PL-02668 Warszawa, Poland |
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Abstract: | Laser Doppler vibrometers (LDVs) are now well-established as an effective non-contact alternative to traditional contacting transducers. Despite 30 years of successful applications, however, very little attention has been given to sensitivity to vibration of the instrument itself. In this paper, the sensitivity to instrument vibration is confirmed before development theoretically and experimentally of a practical scheme to enable correction of measurements for arbitrary instrument vibration. The scheme requires a pair of correction sensors with appropriate orientation and relative location, while using frequency domain processing to accommodate inter-channel time delay and signal integrations. Error reductions in excess of 30 dB are delivered in laboratory tests with simultaneous instrument and target vibration over a broad frequency range. Ultimately, application to measurement on a vehicle simulator experiencing high levels of vibration demonstrates the practical nature of the correction technique and its robustness in a challenging measurement environment. |
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Keywords: | Laser Doppler vibrometry Non-contact surface vibration measurement Correction for instrument vibration Measurement uncertainty |
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