Discussion on ultrasonic wave of ultrasonic extractor from different angles

In terms of frequency range, ultrasound refers to the sound whose frequency is higher than that of audible sound According to the statistical law of human ear, in acoustics, the upper limit of audible frequency is 2 × 104hz So generally speaking, ultrasound is a sound wave with a frequency higher than 20kHz To be more specific, ultrasound with frequency higher than 108hz is called ultra ultrasound In particular, the 108-1012hz frequency band is also called microwave ultrasound because it corresponds to the microwave frequency band in the electromagnetic spectrum In terms of power range of ultrasonic extractor, the continuous wave ultrasound is generally in the range of milliwatts to tens of kilowatts Pulse wave ultrasound can be expanded to a fraction of milliwatts to a few megawatts Accordingly, from the point of view of sound intensity, the upper limit of focused continuous wave ultrasound in liquid is about tens of kilowatts per square centimeter due to the limitation of cavitation, while the center of focused pulse ultrasound in focal spot is even tens of megawatts per square centimeter It is obvious that the research of ultrasonic includes a wide range of contents from linear to nonlinear acoustics From the point of view of propagation medium, ultrasound can effectively propagate in gas, liquid, solid, solid melt and other substances In these media, ultrasonic waves of different frequency, power and intensity have their unique propagation characteristics and effects, so they also have their corresponding research content and wide application Main features of ultrasonic extractor: 1 Intelligent touch screen display 2 Microcomputer automatic ultrasonic control, which can store working data 3 Real time display of dynamic ultrasonic curve 4 Data protection, password protection can be set for the program