One-directional position-sensitive force transducer based on EMFi

The paper describes a one-directional position-sensitive force transducer based on polypropylene electret film (EMFi). While the voltage amplifier had relatively low input impedance, the dynamic response of the transducer in the dilatation phase (recovering of micropores) was four times more intensive than during compression. Software tools for an application of the sensor for recording and comparing human touching patterns were designed. The preliminary test was done with eight subjects using the prototype of the pressure sensitive lock (PSL). Some individuals can use the high security level and could control touching behavior rapidly and accurately within as little as 1 week. The model of the position-sensitive force transducer and preliminary evaluation of the PSL are considered in detail.