Capacitive pressure distribution measuring mat

摘要

In order to reduce disturbing influences in the case of capacitive pressure distribution measuring mats and in order to achieve an increase in the measuring sensor density which is made possible as a result in each case one network having two diodes and one resistor are fitted on each of the rows of a capacitor matrix on the side of the measuring mat from which the measured voltage is directed away. Furthermore, an impedance converter and a further resistor are fitted on the measuring mat. As a result of the impedance conversion of the measured signal which can be achieved in this way and the control of the rows by low-resistance DC voltage sources, disturbances which are caused by the intrinsic capacitance of the connecting leads are prevented. Rows which are not addressed can be connected to a fixed potential by means of this arrangement which prevents adjacent rows influencing the respective measuring row. Surface voltages on the loaded side of the measuring mat are reduced by the use of conductive silicon-rubber strips. These strips act as capacitor plates which are conductively connected to one another in the form of columns. The measuring mat is screened by a conductive silicon-rubber film.