What is the difference between an ultrasonic transducer and underwater acoustic transducer?

What is the difference between an ultrasonic transducer and underwater acoustic transducer?

Speaking of ultrasonic sensors, underwater sonar sensors are often cited. Many people think that these two types of sensors are one type of transducer. What is the difference between these two types of transducer?

The underwater acoustic transducer directly detects and recognizes objects in the water and the contours of the bottom. The underwater sonar sensor sends out a sound wave signal, which will be reflected back when it encounters an object, and its distance and position are calculated based on the reflection time and wave pattern. Sonar sensors are mainly used to detect organisms, such as detecting which organisms are on the bottom of the water, and how big the organisms are. I often ask that the device you hear about water monsters is a sonar sensor.

Ultrasound has a great ability to penetrate liquids and solids, especially in opaque solids, where it can penetrate to a depth of tens of meters. When the ultrasonic wave hits the impurity or the interface, it will produce a significant reflection to form an echo, and it can produce a doppler effect when it hits a moving object. Piezoelectric Ultrasonic transducer are sensors developed using the characteristics of ultrasonic waves. In industry, the typical applications of ultrasonic are non-destructive testing of metals and ultrasonic thickness measurement. The application of ultrasonic sensors in medicine is mainly to diagnose diseases,distance measurement, and it has become an indispensable diagnostic method in clinical medicine.