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As an important component in photoacoustic spectroscopy gas detection systems, the performance of the photoacoustic cavity directly affects the sensitivity and resolution of the system. Based on a study of photoacoustic cavity performance, a new type of arched photoacoustic cavity is proposed. Finite element simulation software is used for modeling. By comparing the influences of the position and radius of the central sphere, the length and radius of the resonant cavity, and the radius of the buffer chamber on the performance of the ph