Multicomponent wavefield characterization with a novel scanning laser interferometer.
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.
Blum
Thomas E
TE
Department of Geosciences, Boise State University, 1910 University Drive, Boise, Idaho 83725, USA. tblum@cgiss.boisestate.edu
van Wijk
Kasper
K
Pouet
Bruno
B
Wartelle
Alexis
A
D002138:Calibration; D004553:Electric Conductivity; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods*; D007834:Lasers; D014159:Transducers; D014465:Ultrasonics