Directivity of photoacoustically generated ultrasound from a thin tube embedded in the soft phantom

Abstract Our previous study has revealed that acoustic resonances have non-negligible effects on photoacoustic signals for a liquid sample confined in thin tube. In this paper, we present numerical and experimental studies the of tube hardness directivity generated signal. A glass capillary silicone 1 mm diameter were tested using pulsed light 637 nm wavelength. Black ink was as material. capillary, resonance modes efficiently excited, clear observed signals. On other hand, little stimulated silicon because impedance matching between surrounding media, which resulted weak confinement waves. The results suggest possibility characterization physical properties tubes.