HOW TO DETERMINE HOW MANY KHZ ULTRASOUND WAVES ARE USED IN A PRODUCT?

Use an oscilloscope to measure its frequency.

Generally, ultrasonic frequencies range from 20 to 40 kHz.

This refers to the frequency, how many waves (or the number of changes it repeats) it contains per second. Ultrasonic equipment generally uses ultrasonic frequencies of 20kHz, 25kHz, 28kHz, 33kHz, 40kHz, 60kHz, 80kHz, 100kHz or above, which have not been widely used.

Ultrasound features.

1) When ultrasonic waves are propagating, the wavelength is short, the directionality is strong, and the energy is easy to concentrate.

2) Ultrasonic waves can propagate in a variety of different media and can travel long enough distances.

3) The interaction between ultrasound and the sound medium is moderate, and it is easy to carry information about the state of the sound medium to diagnose or have an effect on the sound medium.

4) Ultrasonic waves can be effectively propagated in gases, liquids, solids, solid melts and other media.

5) Ultrasound can transfer energy.

6) Ultrasonic waves produce reflection, interference, superposition and resonance.

The frequency of ultrasonic testing generally refers to the frequency of ultrasonic probes, the selection principle is that the higher the sensitivity requirements, the higher the frequency, the more common probe frequency of ordinary metal workpieces is, for special workpieces such as castings, coarser grains of materials, the frequency is slightly lower, such as 2MHz or lower, some sensitivity requirements can be selected above 5MHz frequency, but the higher the frequency, the greater the attenuation.

Some instruments will have a filter frequency range, which can be adjusted appropriately according to the selected probe frequency (some instruments automatically match the filter frequency based on the input probe frequency).

The professional technicians of the bank to answer, usually, after a probe is done, it is necessary to test its parameters, including frequency, resistance, capacitance, etc., because these main parameters are related to the debugging and matching of the power supply, according to a certain frequency design of the transducer or probe, the actual frequency may not be set to be consistent, at this time it is necessary to measure the parameters, meet the design requirements for qualified, the difference is too large can not be used, need to be adjusted. For example, our factory designs a 20k probe, which needs to ensure that the error is within the range, and those that exceed this range are unqualified products and cannot be used.

As long as JY-J301 is used, a total of 15 parameters can be detected.

The content comes from the user: Ruipeng Industry.

Selection of ultrasound frequency.

1. Ultrasonic principle:

Ultrasonic cleaning is based on cavitation, i.e. numerous air bubbles in the cleaning solution form quickly and implode quickly. The resulting impact peels off the dirt on the inner surface of the workpiece that is immersed in the cleaning fluid. As the frequency of ultrasonic increases, the number of bubbles increases and the blasting impact weakens, so high-frequency ultrasound is particularly suitable for cleaning small particles of dirt without damaging the surface of the workpiece.

Bubbles are created by applying high-frequency (ultrasonic frequency) high-intensity sound waves to a liquid. Therefore, any ultrasonic cleaning system must have three basic components: a tank for the cleaning liquid, a transducer that converts electrical energy into mechanical energy, and an ultrasonic generator that generates a high-frequency electrical signal.

2. Transducers and generators.

The most important part of an ultrasonic cleaning system is the transducer. There are two types of transducers, one is a magnetic transducer, which is made of nickel or nickel alloy; A piezoelectric transducer made of lead zirconate titanate or other ceramics.

When an electrical material is placed in a power plant with a varying voltage, it deforms, which is known as the "piezoelectric effect". Comparatively speaking, magnetic transducers are made of materials that will deform in a changing magnetic field.

Regardless of the type of transducer used, it is usually the most basic factor in the intensity of the cavitation effect. Ultrasound, like other sound waves, is a series of pressure points, i.e., a wave that alternates compression and expansion. If the sound energy is strong enough, the liquid is pushed away during the expansion phase of the wave, resulting in bubbles; During the compression phase of the wave, these bubbles burst or implode in the liquid, creating a very effective impact force that is particularly suitable for cleaning.

This process is called cavitation. In fact, in some developed countries such as Europe, America and Japan, high-frequency (

Hertz. Hertz.

Correct answer: B

Sound waves with a frequency destruction rate of less than 20 Hz (Hz) are called infrasound. Grip hall ultrasound is a sound wave with a frequency higher than 20,000 Hz.

The frequency range of ultrasound is 20 20000 Hz.

Ultrasound is a mechanical wave with an extremely short wavelength, mostly shorter than 2 cm (centimeter) in air. It needs to rely on a medium for propagation and cannot exist in a vacuum, such as space. It travels farther in water than in the air, but because of its short wavelength, it is very easy to lose and scatter in the air, and it is not as long as audible sound and infrasound waves, but the short wavelength is easier to obtain anisotropic sound energy, which can be used for cleaning, gravel, sterilization and disinfection.

The word "super" in ultrasound comes from the fact that the lower bound of its frequency band exceeds human hearing, but if it is analyzed by the wavelength angle, the wavelength of ultrasound is actually shorter. Scientists call the distance between two crests or troughs of a wave next to each other wavelength wavelength, and the wavelength of mechanical waves that our human ears can hear is 2 cm 20 m (2 cm 20 m).

Therefore, we call mechanical waves with a wavelength shorter than 2 cm "ultrasound". However, in practical applications, mechanical waves with a wavelength below (above 10,000 Hz) can be regarded as ultrasonic research. Ultrasound, which is commonly used for medical diagnosis, has a wavelength of 10 m to 350 m.

Ultrasonic is a kind of sound wave with a frequency higher than 20,000 Hz, which has good directionality, strong penetrating ability, easy to obtain more concentrated sound energy, and has a long propagation distance in water, which can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, sterilization and disinfection, etc. There are many applications in medicine, military, industry, and agriculture. Ultrasound gets its name from the fact that the lower limit of its frequency is greater than the upper limit of a person's hearing.

Theoretical studies show that under the condition of the same amplitude, the energy of an object vibrating is proportional to the vibration frequency, and when the ultrasonic wave propagates in the medium, the frequency of the medium particle vibration is very high, so the energy is very large in the dry winter of northern China.

If the ultrasonic wave is passed into the water tank, the violent vibration will break the water in the tank into many small droplets, and then use a small fan to blow the droplets into the room, which can increase the humidity of the indoor air, which is the principle of ultrasonic humidifier.

Ultrasonic refers to vibration frequencies greater than 20,000 Hz, and the number of vibrations per second (frequency) is very high, exceeding the general upper limit of human hearing (20,000 Hz), and people call this inaudible sound wave ultrasound. Ultrasound and audible sound are essentially the same, they all have in common a mechanical vibration mode, usually in the form of longitudinal waves in the elastic medium will propagate, is a form of energy propagation, the difference is that the ultrasonic frequency is high, the wavelength is short, and it has good beam and directionality along the straight line propagation at a certain distance, and the frequency range used in abdominal ultrasound imaging is between 2 5 megahz, and it is commonly used as 3 megahz (1 vibration per second is 1hz, 1 megahz = 10 6hz, That is, 1 million vibrations per second, the frequency of audible waves is between 16 and 20,000 Hz).

The range of human hearing is between 20-20,000 Hz, and those below 20 Hz are called infrasound, and those above 20,000 Hz are called ultrasound.

above 20,000 Hz.

Scientists call the number of vibrations per second the frequency of sound, and it is measured in hertz (Hz). The frequency of sound waves that our human ears can hear is 20Hz-20000Hz. Therefore, we call sound waves with frequencies higher than 20,000 Hz "ultrasound".

Ultrasound waves commonly used for medical diagnosis have frequencies ranging from 1 MHz to 30 MHz.

Ultrasonic has good directionality, strong penetrating ability, easy to obtain concentrated sound energy, and has a long propagation distance in water, which can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, sterilization and disinfection, etc. There are many applications in medicine, military, industry, and agriculture. Ultrasound gets its name from the fact that the lower limit of its frequency is greater than the upper limit of a person's hearing.

The specific subdivision is: 20Hz below infrasound, 20Hz 20kHz, is audible sound. 20kHz 500MHz is ultrasound, and more than 500MHz is ultrasonic.

More than 20,000Hz is ultrasound, and less than 20Hz is infrasound. (The hearing range of the human ear is less than 20,000Hz and greater than 20Hz.)

Shenzhen Weitu Technology Co., Ltd.--Specializing in the production of ultrasonic generators, new products on the market, factory direct sales.

The most advanced stepless frequency modulation ultrasonic power supply. 13kHz 75kHz adjustable, so that the output is better matched and more efficient.