After the 1960s, measuring instruments began to develop in the direction of precision, miniaturization, in order to improve the accuracy of differential pressure meters, force balance differential pressure transmitters and capacitive differential pressure transmitters appeared; The underwater ultras

Ultrasonic transducers are also called for ultrasonic probes. Ultrasonic transducers have piezoelectric, magnetostrictive, and electromagnetic types. By the detection technology, piezoelectric type is mainly used.Due to their different structures, the transducer is divided into a straight probe, an