Blum Thomas E, van Wijk Kasper, Pouet Bruno, Wartelle Alexis
Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA.
Rev Sci Instrum. 2010 Jul;81(7):073101. doi: 10.1063/1.3455213.
The in-plane component of the wavefield provides valuable information about media properties from seismology to nondestructive testing. A new compact scanning laser ultrasonic interferometer collects light scattered away from the angle of incidence to provide the absolute ultrasonic displacement for both the out-of-plane and an in-plane components. This new system is tested by measuring the radial and vertical polarization of a Rayleigh wave in an aluminum half-space. The estimated amplitude ratio of the horizontal and vertical displacement agrees well with the theoretical value. The phase difference exhibits a small bias between the two components due to a slightly different frequency response between the two processing channels of the prototype electronic circuitry.
