Mechanical Mechanical Position Trackers Background Mechanical position trackers, also known as goniometers or exoskeletons, measure a person's limb positions via mechanical linkages. The exoskeleton must be physically attached to the user. It can be body-based, in which the entire system is attached to the user, and they are free to move around. Measurements are usually of joint angles or lengths between structures, and are taken with potentiometers or LVDT's.
Some systems also use resistive films or fiber optics.
Advantages No shadowing problem. EXOS Inc. This is actually an SGI page, but has a link to the EXOS home page which I was unable to access. The DHM has 20 DOF of the fingers accomplished through mechanical linkages. The PAM is an arm mounted exoskeleton used to record and capture human arm motions. No other information was available.