Terahertz (THz) radiation, with unique properties and wide - ranging applications, hinges on efficient sources and detectors for further development. Research on THz array detectors for low - repetition - frequency, high - pulse - energy sources is in its infancy. This paper presents a THz optoacoustic array detector. It has high response speed and sensitivity, enabling 3D THz spot scanning and imaging. Size - reduction of the piezoelectric probe crystal improves resolution, parallel scanning boosts efficiency, and it's highly scalable for real - time imaging.