Shape and Deformation Measurement of Free Flying Birds in Flapping Flight

Abstract

This paper describes a new approach for wing shape determination of free fly-ing birds during flapping flight. The optical based measurement method called "image pattern correlation technique" (IPCT) is described as well as modifications of this technique in order to measure wing surfaces formed by feathers. Further-more a newly developed camera driving system is introduced, which enables a movement of the surface measurement system synchronized with a bird. The ap-plication of this system to free flying barn owls is described together with high resolution surface results, obtained during free flapping flight of the bird.