Used as bonding layer between PVDF film and backing material

epoxy will influence characteristics of transducer. EPO-TEK 301 epoxy is used to bond 52 μm-thick PVDF film with copper as backing material.Piezoelectric properties of original PVDF films and transducers are measured by impedance analyzer and in pulseecho test. The measurement results are compared with simulation ones obtained by KLM model. It is shown that both the results are consistent. It is demonstrated that with increase of thickness of bonding layer

sensitivity and center frequency of transducer will be reduced

therefore

it is necessary to control thickness of bonding layer reasonably while designing and fabricating PVDF transducer.