Fig. 3: Measuring the stress in a drum head.
From: Non-destructive mapping of stress and strain in soft thin films through sound waves
a Photograph of the experimental set up. A real-time Optical Coherence Tomography image is displayed in the monitor. b Dispersion relations measured in the dry (upper) and damp (lower) states. Markers, experiment. Dashed curves, theory. c Stresses and strains measured in the dry and damp states. Error bars are the standard deviations over five measurements.
