The principle of ultrasonic
2017/4/17 view:
1. Ultrasonic refers to.
Human ear can hear the sound wave frequency of 20 ~ 20000 hz, when the sound wave vibration frequency is greater than 20000 hz, the human ear cannot hear.Ultrasonic because its cut-off frequency is equal to the upper limit of human auditory about the name.Therefore, we called the acoustic frequency is higher than 20000 Hertz "ultrasonic".
2. Ultrasound is a kind of mechanical wave, mechanical vibration and wave is the physical basis of ultrasonic flaw detection.
The main
Ultrasound in, applications have a lot of fish.Barrier can be used in the distance, speed, test, cleaning, welding, gravel, sterilization, inspect the defects of metal products, welding aluminum metal, wash his clothes, and on the glass drilling, as well as looking for vessels sank...And so on.
Transmission characteristics
The wavelength of ultrasound is relatively shorter than sound, usually a lot of obstacles will be larger than the wavelength of ultrasonic, ultrasonic diffraction capability is not strong, so under the condition of invariable in medium density, ultrasound can consistent along the direction of wave propagation along a straight line, the wavelength of ultrasound is relatively shorter, point-blank ability is better.
Power characteristics
When sound in air, promote the particles in the air for reciprocating vibration particles do work.Acoustic power is said acoustic speed doing work quantities.Under the same intensity, the higher the frequency of the sound waves, it has the greater the power, so ultrasonic compared to the sound waves, ultrasonic power is much bigger than sound waves.
cavitation
As the liquid crack spread of ultrasound in liquid, the liquid molecular energy transfer by ultrasonic, with energy, molecular interaction and produce a lot of bubbles, the bubbles formed the premise condition of cavitation, energy accumulation to a certain degree of the whole liquid and spend an enormous energy bubble burst, cavitation is often used for ultrasonic cleaning machine, and small ultrasonic cleaning machines and the principle of the application.
Human ear can hear the sound wave frequency of 20 ~ 20000 hz, when the sound wave vibration frequency is greater than 20000 hz, the human ear cannot hear.Ultrasonic because its cut-off frequency is equal to the upper limit of human auditory about the name.Therefore, we called the acoustic frequency is higher than 20000 Hertz "ultrasonic".
2. Ultrasound is a kind of mechanical wave, mechanical vibration and wave is the physical basis of ultrasonic flaw detection.
The main
Ultrasound in, applications have a lot of fish.Barrier can be used in the distance, speed, test, cleaning, welding, gravel, sterilization, inspect the defects of metal products, welding aluminum metal, wash his clothes, and on the glass drilling, as well as looking for vessels sank...And so on.
Transmission characteristics
The wavelength of ultrasound is relatively shorter than sound, usually a lot of obstacles will be larger than the wavelength of ultrasonic, ultrasonic diffraction capability is not strong, so under the condition of invariable in medium density, ultrasound can consistent along the direction of wave propagation along a straight line, the wavelength of ultrasound is relatively shorter, point-blank ability is better.
Power characteristics
When sound in air, promote the particles in the air for reciprocating vibration particles do work.Acoustic power is said acoustic speed doing work quantities.Under the same intensity, the higher the frequency of the sound waves, it has the greater the power, so ultrasonic compared to the sound waves, ultrasonic power is much bigger than sound waves.
cavitation
As the liquid crack spread of ultrasound in liquid, the liquid molecular energy transfer by ultrasonic, with energy, molecular interaction and produce a lot of bubbles, the bubbles formed the premise condition of cavitation, energy accumulation to a certain degree of the whole liquid and spend an enormous energy bubble burst, cavitation is often used for ultrasonic cleaning machine, and small ultrasonic cleaning machines and the principle of the application.
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