The principle of the ultrasonic pulse echo method is to use the propagation and reflection characteristics of ultrasonic waves in materials to detect defects or detection objects in materials.
1. Principle:
Ultrasonic pulse echo method is a non-destructive testing technology that uses the propagation and reflection characteristics of ultrasonic waves in materials to detect defects or detection objects in materials. This technology usually uses an ultrasonic probe to emit short pulses of ultrasonic waves to the surface of the material. When the ultrasonic waves propagate to different media areas in the material, reflection, scattering, and transmission will occur.
The ultrasonic probe receives the reflected ultrasonic signal and converts it into an electrical signal. The electrical signal can be recorded and analyzed to confirm the type and location of defects present. This technology is widely used and can be used for defect detection and location of different materials such as metals, ceramics, composite materials, etc.
2. Introduction to ultrasonic waves:
Ultrasound waves are part of sound waves. They are sound waves that are inaudible to the human ear and have a frequency higher than 20KHZ. They are the same as sound waves, that is, They are all produced by material vibration and can only propagate in the medium.
At the same time, it also exists widely in nature. Many animals can emit and receive ultrasonic waves, among which bats are the most prominent. They can use weak ultrasonic echoes to fly in the dark and catch food.
The role of ultrasonic waves:
1. Ultrasonic inspection
The wavelength of ultrasonic waves is shorter than that of ordinary sound waves, has good directionality, and can penetrate opacity Substance, this property has been widely used in ultrasonic flaw detection, thickness measurement, distance measurement, remote control and ultrasonic imaging technology.
2. Ultrasonic treatment
Using the mechanical effect, cavitation, thermal effect and chemical effect of ultrasound, ultrasonic welding, drilling, solid crushing, emulsification, degassing, Dust removal, pot scale removal, cleaning, sterilization, promotion of chemical reactions and biological research, etc., have been widely used in various sectors such as industry, mining, agriculture, and medical care.
3. Ultrasonic cleaning
The principle of ultrasonic cleaning is that the high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and spreads to the medium. The ultrasonic waves in the cleaning solvent radiate forward in alternating density and density in the cleaning liquid, causing the liquid to flow and generate tens of thousands of tiny bubbles. The tiny bubbles (cavitation nuclei) existing in the liquid vibrate under the action of the sound field.