2134/14047 Steve Rothberg Steve Rothberg Mario Tirabassi Mario Tirabassi Development of a scanning head for laser Doppler vibrometry (LDV) using dual optical wedges Loughborough University 2014 untagged Mechanical Engineering not elsewhere classified 2014-01-29 09:52:28 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Development_of_a_scanning_head_for_laser_Doppler_vibrometry_LDV_using_dual_optical_wedges/9564584 A new laser Doppler vibrometry scanning head is proposed based on a pair of rotating optical wedges. A comprehensive mathematical model is developed and used to demonstrate how the wedges can be configured to scan point-by-point, in a line, in a circle, and in a combination of the two such that a straight line scan could be performed on a structure during rotation. Inevitable misalignments are incorporated into the model and considered quantitatively for the circular tracking application. Certain advantages are apparent over systems based on dual mirrors and a Dove prism in terms of lower apparent velocities at low rotation orders. A scanning head design for the circular tracking application is presented, together with experimental data showing good agreement between predicted and measured apparent velocities caused by misalignments.