A transient grating laser ultrasonic method known as real-time impulsive stimulated thermal scattering is used to excite and monitor Lamb acoustic waveguide modes in free-standing thin polyimide films which are known to have transverse isotropic symmetry. The dispersion of these Lamb modes is used to accurately evaluate both the in and out-of-plane elastic moduli.
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Rogers et al. (1994) studied this question.
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