为了研究水下气泡的粒径、速度和浓度特性,提出基于高速电荷耦合器件(CCD)的气泡照明和三维摄影光学系统.采用532 nm半导体激光器，基于伽利略结构用三个柱面镜设计了厚度1.5 mm，宽度44 mm的片光源。设计物像距530 mm,放大率为0.4，1，2.5倍(×)的摄影光学系统,每组均由共用前组镜和会聚镜组成，中间以平行光中继。通过同步移动片光源和共用前组镜实现60 mm×40 mm视场内二维高速成像和纵向5 mm扫描，具有结构简单、性能可靠的特点。对设计结果进行评价，0.4，1，2.5×成像光学系统在0.707ω，50 lp/mm时调制传递函数值分别为0.58，0.55和0.38，能够分辨粒径范围为10～450 μm的气泡。

For the purpose of study on diameter, velocity and concentration of air bubbles in water, an optical system of illumination and 3D photography based on high-speed imaging charge-coupled device is proposed. Based on Galileo structure with three cylindrical lens and semiconductor laser of wavelength 532 nm, a light sheet with thickness of 1.5 mm and width of 44 mm is designed. Three groups of imaging lens with magnification of 0.4×， 1× and 2.5×, having a uniform conjugate distance of 530 mm are designed. Each group relayed by collimated light includes frontal lens and focusing lens. A simple and reliable structure of 2D high-speed photography for the area of 60 mm×40 mm and 1D scan with length of 5 mm along the optical axis, is achieved by moving light sheet and frontal lens synchronously. The imaging quality of the optical system with magnification of 0.4×, 1× and 2.5× is evaluated, it shows that the modulation transfer function of 0.707ω has reached 0.58, 0.55 and 0.38 respectively at the spatial frequency of 50 lp/mm, as well as the diameter resolution of air bubbles in water has been from 10 μm to 450 μm.