Ultrasonic machine ultrasonic is characterized by the easy formation of a thin beam, and can be scattered by fairly small obstacles, ultrasonic machine including back (reverse) scattering. By shooting the thin beam straight ahead and swinging it up and down, you can search for obstacles ahead. By means of electronics, it is easy to measure the rotation time of reflected or backscattered waves, and the position of obstacles in front can be determined with the known speed of sound. When the obstacle is large enough, the ultrasonic machine can show the shape of the obstacle by the distribution of the echo moving with the acoustic beam. Compared with smaller obstacles, people are looking for ways to judge the characteristics of obstacles such as size, shape and inclusion. For non-uniform transparent materials, we often use optical methods to detect; For opaque materials, ordinary optical methods are not possible. Sound waves, including ultrasound, can penetrate any medium, whether it be gas, liquid, or solid, and whether it be light or not, varying only in the depth of penetration. Because of the same principle of the ultrasonic machine, it is easy to achieve not only narrow beam, but also focus the beam, as people usually focus light. In the focal or focal area, the intensity can be high enough to produce some intense effects. Ultrasonic machine in industry subdivided categories are: acoustic welding machine, ultrasonic cleaning machine, ultrasonic lace machine, ultrasonic mask machine, ultrasonic instrument welding machine, ultrasonic flow meter, ultrasonic flaw detector, ultrasonic cleaning machine, etc..