Acta Optica Sinica, Volume. 32, Issue 4, 422002(2012)
Design of High-Speed Photography Optical System for Air Bubbles in Water
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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Xie Zhengmao, Gao Limin, He Junhua. Design of High-Speed Photography Optical System for Air Bubbles in Water[J]. Acta Optica Sinica, 2012, 32(4): 422002
Category: Optical Design and Fabrication
Received: Aug. 30, 2011
Accepted: --
Published Online: Mar. 30, 2012
The Author Email: Zhengmao Xie (minrycn@163.com)