Optimum design and error analysis of a monocular stereoscopic sensor used in three-dimensional particle image velocimetry

Li Yan; Fajie Duan; Liang Hu

doi:10.1117/12.694433

10 June 2006 Optimum design and error analysis of a monocular stereoscopic sensor used in three-dimensional particle image velocimetry

Li Yan, Fajie Duan, Liang Hu

Author Affiliations +

Proceedings Volume 6344, Advanced Laser Technologies 2005; 634430 (2006) https://doi.org/10.1117/12.694433
Event: Advanced Laser Technologies 2005, 2005, Tianjin, China

Abstract

Particle image velocimetry (PIV) is the newest entrant to the field of fluid flow measurement and provides instantaneous velocity fields over global domains. A monocular stereoscopic sensor is designed according to the characteristics of a 3D-PIV system. It includes only one CCD camera and two groups of symmetry mirrors. A measured particle in the flow field is mapped to the CCD image surface from two angular directions and each directed-picture occupies half the image surface. Imaging procedure is decomposed to illustrate the principle of the monocular stereoscopic sensor. It is proved that folding optical path enables the possibility of miniaturized sensor design. A perspective transformation model and a geometric error model are presented for analysis and design of stereoscopic PIV system. The relationship between sensor performance and its geometric parameters is discussed in detail. These parameters contain the angle between two mirrors in the same group, the angle and distance between mirrors in each group, the distance between mirrors and camera and so on. Enough theoretical research is made for the optimum design of the stereovision system. In addition, measuring accuracy is also related to the position of the particle, especially in both x and z direction. Simulation results indicate that out-of-plane errors are higher than in-plane errors in most area.

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Li Yan, Fajie Duan, and Liang Hu "Optimum design and error analysis of a monocular stereoscopic sensor used in three-dimensional particle image velocimetry", Proc. SPIE 6344, Advanced Laser Technologies 2005, 634430 (10 June 2006); https://doi.org/10.1117/12.694433

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KEYWORDS

Sensors

Mirrors

Cameras

Error analysis

Particles

CCD cameras

3D image processing

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