Design of high-speed photography optical system for air bubbles in water

被引：0
|
作者：
Xie, Zhengmao [1 ,2 ]
Gao, Limin [1 ]
He, Junhua [1 ]
机构：
[1] Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an
[2] Graduate University of Chinese Academy of Sciences
来源：
Guangxue Xuebao/Acta Optica Sinica | 2012年 / 32卷 / 04期
关键词：
Air bubbles in water; High-speed photography; Light sheet; Oceanic optics; Optical design;
D O I：
10.3788/AOS201232.0422002
中图分类号：
学科分类号：
摘要：
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.
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