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The interaction between supersonic freestreams and rectangular cavity geometries often induces complex acoustic resonance modes that can adversely affect structural integrity and operational performance in aviation systems. Traditional methods for measuring these resonance phenomena, such as pressure transducers or microphones, are inherently invasive and provide limited spatial resolution, posing challenges in studying the dynamic and transient nature of acoustic waves. This research aims to address these limitations by developing a non-invasive measurement technique utilizing shadowgraph imaging in a cavity with optically clear sidewalls. Shadowgraph visualization highlights pressure gradients, enabling real-time imaging of acoustic waves and resonance patterns without obstructing the test region. Through advanced data processing techniques applied to shadowgraph video, this study proposes a novel approach to capturing and analyzing acoustic resonance modes under supersonic conditions. The findings have potential applications in optimizing aerodynamic designs, mitigating resonance-related structural impacts, and enhancing the understanding of fluid-structure interactions in high-speed flows.