Measuring the camber deformation of a dragonfly wing using projected comb fringe

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Abstract
The camber deformations of the flapping insect wing provide important information for lift force analysis. Recent measurements are nearly all based on the hypothesis of the rigid wing, neglecting the camber deformation. In this article, a measurement system based on fringe pattern projection is introduced. Projected comb fringes, whose intensity function is near a comb function, were used instead of conventional sine fringes because of their high intensity and sharpness, allowing us to take the distorted fringes on the transparent dragonfly wing easily. The camber deformation and torsion angle of a flapping dragonfly wing can be measured without hypothesizing that the wing is a rigid plate. The experimental result shows that the camber deformation is different during upstroke and downstroke. It is very important for the explanation of the lift force.