NON-CONTACT CAPACITANCE SENSOR SYSTEM FOR INTELLIGENT PROSTHESIS

摘要

A non-contact capacitance sensor system for an intelligent prosthesis includes a front measuring end (1), a signal acquisition unit (2) and a signal processing unit (3). The front measuring end (1) is composed of capacitance electrode plates (4) arranged in a prosthesis receiving cavity. The capacitance electrode plates (4) are located between the prosthesis receiving cavity (5) and a lining (6) and are not in contact with the skin. Each capacitance electrode plate (4) is coupled to a human body (7) to form a capacitor. The signal acquisition unit (2) comprises a CTD module (8) and a control module (9). The CTD module (8) measures an electric capacity by measuring the ratio between the discharge time of the capacitor to be measured and the discharge time of a reference capacitor. The signal processing unit (3) is composed of a filtering module (10) and a communication module (11). The non-contact capacitance sensor system is good in signal repeatability, unaffected by sweat on the skin, high in wearing stability, and low in cost. The non-contact capacitance sensor system can adapt to various types of disabled and amputated lower limbs and various lengths of disabled limbs and can be widely applied to the intelligent prosthesis control field.