Fringe projection technique for the instantaneous three-dimensional shape measurement of fin

Ming Jiang; Xiaoyuan He

doi:10.1117/12.839316

25 August 2009 Fringe projection technique for the instantaneous three-dimensional shape measurement of fin

Ming Jiang, Xiaoyuan He

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73754Q (2009) https://doi.org/10.1117/12.839316
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Tail fin is an important part of the fish to produce thrust in swimming. A three-dimensional (3D) analysis is necessary to understanding the function of tail fin. A precise test method for 3D tail fin profile is critical to study the tail fin kinematics. This paper describes the 3D shape measurement of swimming fish fin by a non-contact optical method based on the fringe projection technique. Sinusoidal fringes are projected onto fish during steady swimming by a slide projector. It will produce the deformed fringe patterns containing 3D information. These time-sequence deformed fringe pattern images are captured by a high speed camera (1000 frames per second). By 2D Fourier transform, filter, inverse Fourier transform and unwrap phases in 3D phase space frame-by-frame, the instantaneous 3D shape is obtained and the continuous variety profiles of tail fin are reconstructed. This paper displays parting the profiles in a quarter of a beat cycle, the steady swimming speed with 0.5Ls^-1(where the L is fish body length). The present study provides a new method to quantify the analysis of kinematic characteristic of the tail fin during steady swimming.

Citation Download Citation

Ming Jiang and Xiaoyuan He "Fringe projection technique for the instantaneous three-dimensional shape measurement of fin", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754Q (25 August 2009); https://doi.org/10.1117/12.839316

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KEYWORDS

3D metrology

Fourier transforms

High speed cameras

Kinematics

Fringe analysis

Projection systems

Imaging systems

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