title: Optical dynamic deformation measurements at translucent materials.
abstract: Due to their high stiffness-to-weight ratio, glass fiber-reinforced polymers are an attractive material for rotors, e.g., in the aerospace industry. A fundamental understanding of the material behavior requires non-contact, in-situ dynamic deformation measurements. The high surface speeds and particularly the translucence of the material limit the usability of conventional optical measurement techniques. We demonstrate that the laser Doppler distance sensor provides a powerful and reliable tool for monitoring radial expansion at fast rotating translucent materials. We find that backscattering in material volume does not lead to secondary signals as surface scattering results in degradation of the measurement volume inside the translucent medium. This ensures that the acquired signal contains information of the rotor surface only, as long as the sample surface is rough enough. Dynamic deformation measurements of fast-rotating fiber-reinforced polymer composite rotors with surface speeds of more than 300 m/s underline the potential of the laser Doppler sensor.
authors: Katrin
authors: K
authors: Philipp
authors: Nektarios
authors: N
authors: Koukourakis
authors: Robert
authors: R
authors: Kuschmierz
authors: Christoph
authors: C
authors: Leithold
authors: Andreas
authors: A
authors: Fischer
authors: Jürgen
authors: J
authors: Czarske
mesh_terms: D005898:Glass; D008422:Materials Testing; D055620:Optical Phenomena; D011108:Polymers; D012399:Rotation; D013499:Surface Properties
chemical_list: D011108:Polymers; C009753:fiberglass