An automatic position calibration method for the scanning laser Doppler vibrometer

When using a scanning Doppler laser vibrometer (SLDV) an important amount of user interaction is required to perform a calibration between the required scanning mirror angles and the coordinates of the grid points which are to be measured. Apart from the possibility of leading to incorrect (or inaccurate) laser beam positioning, the user interaction is a problem when the SLDV is used in-line (for instance as a quality control tool in the production process). In this paper, a method is developed to perform the position calibration in a fully automatic manner. The method is validated with the aid of two SLDV measurement examples: a sheet with a rectangular mesh, and an electronic circuit board.