ABSTRACT A technique has been demonstrated which measures the optical absorption coefficient in weakly to moderately absorbing homogeneous isotropic elastic plates. This technique involves generating plate waves with a pulsed Nd:YAG laser and then detecting the disturbances in the acoustic far field where the majority of the acoustic energy has been coupled into the first symmetric, so, and antisymmetric, ao, plate modes. The optical absorption coefficient is determined by comparing the experimental and theoretical expression for the ratio of the integrated power spectra of the so and ao modes.
1997 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 44:902-908
© 1997 by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.