Digital Tactile Sensor
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
A digital tactile sensor consists of a piezoelectric transducer that utilizes the resonant frequency to measure the load applied to the system. As shown in Fig. 1, the sensor 10 consists of a piezoelectric bilayered structure 12 which flexes in response to an applied AC voltage (not shown) having a typical frequency of the order of 20 kHz when its length is 1 cm. A block 14 of rigid material is glued to the piezoelectric structure 12 so that the block makes a vibrating motion relative to the surface 16 of the substrate 18, as shown in Fig. 2. Both the block 14 and the surface 16 must have a flatness in which the roughness is less than 1 m inch.