Angle dynamic measurements of body joints have become an important parameter to know for sportsmen, physicians and analysts of rehabilitation processes. The development of devices that allows those measurements turns out to be a hard work for biomedical engineers because during the acquisition process the mechanical system usually affects the natural joints movements. Digital goniometers have b...

A method to introduce optical fibers technology to physics and engineering students is presented. As the attenuation in an optical fiber depends on several factors including macro bending, an optical fiber angle sensor has been developed. The method used to increase the sensibility of the sensor consisted on side polishing the optical fiber. In the near future is expected to integrate this sens...

A directional data set of bare soil and alfalfa acquired using the Swiss Field Goniometer during the DAIS Experiment 1999 (DAISEX’99) campaign is preprocessed and analyzed for its quality. Two different normalization methods to derive anisotropy factors are tested and discussed. The possible effect of varying reflectances on the retrieval of vegetation parameters due to changing sun and viewing...

This paper exposes the experimental evaluation of a new technique for the estimation of the instantaneous helical axis of movement of human anatomical joints. The measurement technique, using a six degrees of freedom spatial electro-goniometer, is tested onto a simple revolute joint and onto a subject’s knee. A motion capture system with active optical markers is used at the same time in order ...

An experimental determination on powder mixtures of SiC-3C and 6H polytypes using an X-ray goniometer system showed the possibility of quantitative determination of polytype fraction directly from peak intensities. In combination with calculated X-ray intensities of 15R and 4H polytype, the method yields a simple equation system for the relative quantities of SiC polytypes 15R, 6H, 4H and 3C in...

The Bidirectional Reflectance Distribution Function (BRDF) is an inherent property of natural and manmade materials. Its effects depend on the illumination/observation geometry and wavelengths and are apparent in groundbased, airborne and spaceborne imagery. The BRDF is a fundamental quantity from which all other illumination/reflection configurations can be derived. Calibration and validation ...