LASER MEASUREMENT SYSTEM FOR DYNAMIC STRUCTURAL ANALYSIS

摘要

A laser vibrational measurement system (5) to point a laser beam (14) at a specific point (11) on a vibrating structure (12) to extract the vibrational velocity at that point uses a laser velocimeter (10) having a beam (14) that is controlled by a computer (18), having stored within, a geometry file (19) of coordinates for points (11) on the structure (12). The computer (18) maps each of the structure points (11a - 11n) within the geometry file (19) to a set of horizontal and vertical deflection angles and the corresponding control signals necessary to point the laser beam (14) at each particular geometry point (11) of interest on the structure (12). In one alternative form, a single laser beam (14) is aimed at a point (11) and the line-of-sight velocity data extracted is corrected to yield velocity data which is along an axis (Z) outward normal to the structure surface at the point (11). In a second alternative, multiple laser beams (120, 122, 124) or a single laser beam from multiple positions is aimed at a test point (11) and the line-of-sight velocity data extracted is corrected to yield velocities along three axes (X, Y, Z) of an orthogonal coordinate system, and thus, three-dimensional vibrational data. The extracted vibrational data is then further processed and displayed in a humanly perceptible form.