A photogrammetry-based experimental modal analysis method by tracking visible laser spots

A photogrammetry-based experimental modal analysis (EMA) method is developed, where a single-point laser shines a laser beam to a surface of a test object and an exterior feature is added to the test object in the form of a high-contrast laser spot. A three-dimensional kinematic model is developed to derive the kinematic relation between the laser spot and its associated image target on an image plane of a camera. A point-tracking technique is...