Transparent glass-windowed ultrasound transducers

Glass windowed ultrasound transducers have several potential uses ranging from multi-modal research (ultrasound and optics) to industrial application in oil and gas or chemistry. In our work here we compare four different designs for transparent glass windowed ultrasound transducers. Each design was characterised using field scanning, radiation force measurements, frequency sensitivity measurement and FEM simulations. Field scans showed that small variations in design can greatly affect the size and location of the acoustic focus. The results coincided with those seen in the simulations. Radiation force measurements showed that the devices were able to easily exceed acoustic powers of 10 W, with efficiencies of up to 40%. Isostatic simulations shows that the design also affects the physical strength of the devices. Current designs were able to withstand between 300 and 700 psi on the front surface. The devices were cost effective due to the minimal amount of materials necessary and the simple fabrication process. More work needs to be done to improve the power output and stress handling capabilities.