A method for obtaining C‐scan images is reported by using a Lamb wave device with two arched interdigital transducers, in which the phase difference between an input signal as a reference and a delayed signal reflected at a sample surface or inside a test sample is detected as a function of the position. The transducers are used as a sound beam radiator or a detector at a liquid–solid interface. Acoustic imaging results are satisfactory in measuring the stress fields in ceramic samples.