HALKON, B.J. and ROTHBERG, S., 2017. Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration. Optics and Lasers in Engineering, 91, pp. 16-23.
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.
This paper is in closed access until November 2017.