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 μm with a field of view of 320 mm × 150 mm. We used this system to study the 3D human foot arch deformation under low loads <i>in vivo</i>. First results indicate the hysteresis behavior of the human foot under a low load (50 to 450 N).
© 2002 Optical Society of America
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
Jaime Meneses, Tijani Gharbi, and Jean Yves Cornu, "Three-Dimensional Optical High-Resolution Profiler with a Large Observation Field: Foot Arch Behavior under Low Static Charge Studies," Appl. Opt. 41, 5267-5274 (2002)