Three-dimensional optical high-resolution profiler with a large observation field: foot arch behavior under low static charge studies.
Our aim is to describe a method for detecting small deformations from a three-dimensional (3D) shape of large lateral dimensions. For this purpose the measurement method is based on the simultaneous utilization of several 3D optical systems and the phase-shifting technique. In this way, the following problems appear: optical distortion due to the large field observed, nonlinear phase-to-height conversion, conversion of image coordinates into object coordinates for each 3D optical system, and coordinate unification of all optical systems. The resolution is 50 microm with a field of view of 320 mm x 150 mm. We used this system to study the 3D human foot arch deformation under low loads in vivo. First results indicate the hysteresis behavior of the human foot under a low load (50 to 450 N).
Meneses
Jaime
J
Grupo de Optica, Escuela de Fisica, Universidad Industrial de Santander, Bucaramanga, Colombia.
Gharbi
Tijani
T
Cornu
Jean Yves
JY
D001696:Biomechanical Phenomena; D005528:Foot / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D055095:Optics and Photonics; D016474:Weight-Bearing