Surface Acoustic Wave-Based Flexible Piezocomposite Strain Sensor

A surface acoustic wave (SAW), device composed of polymer and ceramic fillers, exhibiting high piezoelectricity flexibility, has a wide range sensing applications in the aerospace field. The demand for flexible SAW sensors been gradually increasing due to their small size, wireless capability, low fabrication cost, fast response time. This paper discusses structural, thermal, electrical properties developed sensor, based on different micro- nano-fillers, such as lead zirconate titanate (PZT), calcium copper (CCTO), carbon nanotubes (CNTs), along with polyvinylidene fluoride (PVDF) matrix. piezocomposite substrate sensor is fabricated using hot press, while interdigital transducers (IDTs) are deposited through 3D printing. piezoelectric also enhanced non-contact corona poling technique under electric field align dipoles. Results show that passive strain can measure mechanical strains by examining frequency shifts detected signals.