超声波与次声波的现代应用（Modern applications of ultrasonic and infrasonic waves）.doc

超声波与次声波的现代应用（Modern applications of ultrasonic and infrasonic waves） Ultrasonic and acoustic wave and other modern applications Ultrasonic technology is a physical, electronic, machinery and materials science as the foundation of general technology. Ultrasonic technology is through ultrasonic generation and transmission and reception The physical process and complete. Ultrasonic wave has the bunching, orientation and reflection and transmission characteristics. According to the ultrasonic vibration radiation of different sizes can be divided into: 1, the application of power ultrasonic changes of objects or objects called power ultrasound, for example: have enough energy in the liquid, can produce cavitation In the cleaning, emulsification. 2, get some information obtained by ultrasonic, ultrasonic detection of communications applications, said, for example, the object thickness by ultrasonic pulse reflection in the medium Said ultrasonic thickness measurement. Ultrasonic cleaning and its application: An ultrasonic cleaning principle Ultrasonic cleaning is a physical cleaning, the cleaning fluid into the slot, the effect of ultrasonic in the groove. The ultrasonic vibration wave and acoustic wave is a dense, in In the process of communication, medium pressure alternation. In the negative zone, tear force in the liquid, and the formation of a vacuum bubble. When the pressure reaches a certain value, The rapid growth of the bubble, in positive pressure area due to bubble burst, closed extrusion pressure. At this time, to generate a strong shock wave interaction between liquid. Although the displacement, speed Are very small, but the acceleration is very large, the partial pressure of up to several thousand atmospheres, this is called cavitation. Two factors affecting the cleaning effect 1, and the relationship between frequency: generally the lower the frequency of the cavitation effect is more obvious, but the noise is relatively high, relatively smooth surface objec