Five-axis scanning laser vibrometry for three-dimensional measurements of non-planar surfaces

Abstract

A novel system for directing the beam of a single-point laser Doppler vibrometer (LDV) to measure three-dimensional velocity components of non-planar targets has been developed. A description of this measurement system is presented, along with a discussion of relative merits as compared with conventional scanning LDV systems. Two data sets are presented. In the first, sample measurements of a bulk solid are compared with an analytic model as verification of the measurement technique. In the second, measurements of the surface of sand over a buried anti-tank landmine are presented as a demonstration of the full capability of the system.