On the development and characterisation of a synchronised-scanning laser doppler vibrome-ter system

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Conference Proceeding
25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, 2018, 5 pp. 2876 - 2883
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© 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved. Laser Doppler vibrometry (LDV) is now a well-established technique for the non-contact measurement of surface vibration at a point of interest. LDV exhibits numerous benefits over traditional contacting transducers but care must be taken with data interpretation in various scenarios of particular interest. In this paper, the development of a synchronised-scanning LDV system for measurements directly from rotating structures will be described in detail. While still employing the now traditional pair of orthogonally oriented scanning mirrors for laser beam orientation manipulation, this system, for the first time, makes use of hardware-based National Instruments LabVIEW RealTime/FPGA technology to achieve the desired mirror drive signals yielding excellent performance with little loss of flexibility. Characterisation of the performance of the system from a frequency-dependent standpoint will be set-out. Ultimately, manipulation of the generated signals to counter mirror inertia related challenges in maintaining the probe laser beam at the desired position/profile is considered. A number of practically realisable synchronised-scanning profiles will be described on a simplified laboratory set-up with initial interrogation of the resulting measured vibration velocity signals ultimately being made.
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