Visibility high-precision measurement has a wide range of applications in the field of aviation and navigation. This paper proposes and designs a visibility measuring system based on a multi-reflection cell. In terms of the definition of the meteorological optical range (MOR), this system calculates the distance at which the beam is attenuated to 5% by means of multiple reflections with a long propagation distance, so as to obtain accurate atmospheric visibility. Different from the short-distance ring-down cavity with a length of 0.5 m, the length of the multi-reflection cell of this system can reach more than 10 m. Compared with the traditional transmissive method, the calculation results are more in line with the real situation of the atmospheric environment because the atmospheric non-uniformity and inversion parameters are considered. Experiments show that this method has better robustness and can stably measure atmospheric visibility under the condition of limited equipment space with an error of 5%.

能见度高精度测量在航空、航海领域有着广泛的应用。本文提出并设计了一种基于多重反射池的能见度测量系统。该系统根据气象光学范围（MOR）的定义，通过长传播距离的多次反射计算光束衰减到5%的距离，从而获得准确的大气能见度。与长度为0.5 m的短距离衰荡腔不同，该系统的多重反射池的长度可以达到10 m以上。与传统透射法相比，由于考虑了大气不均匀性和反演参数，计算结果更符合大气环境的真实情况。实验表明，该方法具有较好的鲁棒性，能够在设备空间有限的情况下稳定测量大气能见度，误差在5%以内。