This study investigates the development and optimization of a novel photoacoustic microscopy (PAM) system incorporating a micro-ring resonator (MRR) for advanced ultrasound detection. PAM is a powerful imaging technique recognized for its ability to visualize optical absorption contrast in biological tissues without the need for contrast agents, enabling high-resolution imaging with lateral resolution determined solely by the optical diffraction limit. The primary aim of this research was to construct and refine a device capable of capturing photoacoustic signals generated by a pulsed laser and analyzing these signals to detect the Doppler effect in fluids, potentially facilitating non-invasive measurements of blood flow velocities within complex vascular networks.