Ultrasonic transducer for multi-frequency, multi-layer test head can transmit different frequencies and receive frequency selectively over wide band with higher sensitivity than conventional arrangements

摘要

The arrangement has at least two oscillation layers arranged one after the other in the radiation direction and which can be driven individually or as a group (G1,G2). At least two groups can be operated at different frequencies and at least one group can be operated as a transmitter and at least one group as a receiver. The group operated as a transmitter is different from the group operated as a receiver.