We use laser doppler vibrometry (LDV) to evaluate the contribution of acoustic energy to surface topography and dynamic motion as well as to visualize the operation of our acoustofluidics device. Our devices are evaluated using a full-field scanning microscope-based vibrometer (MSA-600 X/U, Polytec GmbH, Germany) and software (PSV, Polytec GmbH, Germany) that enables us to measure sub-nanometer displacement of our PDMS-embedded IDT's as a function of modulation across frequency and amplitude parameters. To record acoustic displacement maps, we use an opaque device that is suspended on an observation stage such that only the edges of the SAW wafer are in contact with the mount. We then obtain scans of at least one full IDT finger-pair along with the region where the T-junction of our microfluidics channels reside using combinations of frequency and applied voltages. These bandwidth scans allowed us to identify potential resonance frequencies of our devices (10 kHz, 20 kHz, 30 kHz, 5 MHz, 21 MHz, and 36 MHz) at a range of applied voltages (0.5, 1, and 1.5 Vp-p).