High-sensitivity laser-based detection of lamb waves using photo-EMF sensors

摘要

In this paper we describe the use of a compensated reference beam interferometer with photo-emf detection for the measurement of laser-generated Lamb waves. We will show that a photo-emf receiver can detect Lamb waves with adequate sensitivity and wide field of view, without the requirement for path-length stabilization or post-processing electronics. In addition, a photo-emf receiver can be configured to measure both in-plane and out-of-plane motion, using a single probe beam.