Diffusion Layer Ultrasonic Transducer

By diffusing copper into the surface of conductive cadmium sulfide single-crystal samples, thin piezo-electrically active layers have been formed. Such diffusion layers have been shown to act as ultrasonic transducers with operating frequencies well above 100 Mc. Short delay lines with less than 30 dB of insertion loss at 175 Mc have been made using such diffusion layer transducers.