Acousto-optic sensing provides an alternative approach to traditional microphone arrays by shedding light on the interaction of light with an acoustic field. Sound field reconstruction is a fascinating and advanced technique used in acousto-optics sensing. Current challenges in sound-field reconstruction methods pertain to scenarios in which the sound source is located within the reconstruction area, known as the exterior problem. Existing reconstruction algorithms, primarily designed for interior scenarios, often exhibit suboptimal performance when applied to exterior cases. This paper introduces a novel technique for exterior sound-field reconstruction. The proposed method leverages concentric circle sampling and a two-dimensional exterior sound-field reconstruction approach based on circular harmonic extensions. To evaluate the efficacy of this approach, both numerical simulations and practical experiments are conducted. The results highlight the superior accuracy of the proposed method when compared to conventional reconstruction methods, all while utilizing a minimal amount of measured projection data.

翻译：声光传感通过揭示光与声场的相互作用，为传统麦克风阵列提供了一种替代方案。声场重建是声光传感领域中一项引人入胜且先进的技术。当前声场重建方法面临的挑战主要在于声源位于重建区域内部的场景，即外部问题。现有的重建算法主要针对内部场景设计，在应用于外部情况时往往表现欠佳。本文提出了一种用于外部声场重建的新技术。该方法利用同心圆采样以及一种基于圆谐展开的二维外部声场重建方法。为评估该方法的有效性，我们同时进行了数值模拟和实际实验。结果表明，与传统的重建方法相比，所提方法在仅使用少量测量投影数据的情况下，仍展现出更高的精度。