Expository text of ultrasound and infrasound, the frequency range of infrasound and ultrasound respe

Ultrasound: 1Ultrasonic welding.

2.Ultrasonic nebulization.

3.Ultrasonic drilling.

4.Ultrasound dispersion.

5.Ultrasonic cutting.

6.Ultrasonic electric cremation combined processing.

7.Ultrasonic cleaning.

The application of infrasound began in the 50s of the 20th century and has gradually been widely valued by people. The application prospects of infrasound waves are roughly as follows:

1) By studying the characteristics and mechanisms of infrasound generated by natural phenomena, we will study and understand the characteristics and laws of these natural phenomena in a more in-depth manner. For example, the infrasound waves generated by the aurora can be used to study the laws of aurora activity. �

2) Using the infrasound wave generated by the received sound source, the location, size and other characteristics of the sound source can be detected. For example, the relevant parameters of these infrasound sources can be detected by receiving infrasound waves generated by nuclear **, rocket launches, or typhoons. �

3) **Natural disaster events. Many catastrophic natural phenomena, such as volcanic eruptions, tornadoes, thunderstorms, typhoons, etc., may radiate infrasound waves before they occur, and it is possible for people to use these precursor phenomena to ** and predict the occurrence of these catastrophic natural events. �

4) When infrasound waves propagate in the atmosphere, they are easily affected by the atmospheric medium, which is closely related to factors such as wind and temperature distribution in the atmosphere. Therefore, the properties and laws of some large-scale meteorology can be detected by measuring the propagation characteristics of natural or artificially generated infrasound waves in the atmosphere. The advantage of this approach is that it allows for continuous detection and monitoring of a large area of the atmosphere.

5) Detect these activity characteristics by measuring the results of the interaction of infrasound waves with other fluctuations in the atmosphere. For example, in the ionosphere, the action of infrasound waves causes the propagation of radio waves to be disturbed by travel, and the law of ionospheric disturbance can be further revealed by measuring the characteristics of infrasound waves. �

6) Not only are humans and other creatures capable of certain responses to infrasound waves, but some of their (or their) organs also emit faint infrasound waves. Therefore, the properties of these infrasound waves can be measured to understand the activity of the corresponding organs of the human body or other living organisms.

Resources.

I would like to add to the upper position: ultrasonic splash is greater than 20,000 decibels, and infrasound splash is less than 20 decibels

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Focused ultrasound technology, providing has...

1. The frequency range of ultrasonic is higher than 20000Hz, infrasound.

The frequency range is below 20Hz.

2. The characteristics of ultrasound: good directionality and strong penetrating ability.

3. The use of ultrasound: (1) ultrasonic flaw detection, thickness measurement, ranging, medical diagnosis and imaging. (2) Ultrasonic treatment, such as processing, cleaning, welding, emulsifying, crushing, degassing, seed treatment, etc.

4. Characteristics of infrasound waves: (1) attenuation during propagation, longer wavelength, and can bypass obstacles. (2) The propagation distance is long, and the powerful infrasonic wave is very destructive.

5. The use of infrasound waves: detection of nuclear **.

6. The harm of infrasound: (1) It is very destructive to the building, and can crack the building and even make the building swing. (2) It is harmful to the human body, when people are in a 2 10Hz infrasonic environment, they will produce symptoms such as blindness, nausea, and nervousness.

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1. Ultrasound.

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.

2. Infrasound.

Sound waves with a frequency of less than 20 Hz (Hertz) are called infrasound. Infrasound waves are not easily attenuated and are not easily absorbed by water and air. Infrasound waves, on the other hand, tend to have a very long wavelength, so they can diffract around some large obstacles.

Some infrasound waves can circle the Earth for 2 to 3 cycles. Due to the similarity or even the same vibration frequency as the vibration frequency of human organs, infrasound waves of certain frequencies are easy to resonate with human organs, which is very harmful to the human body and can cause death when dangerous.

1. Characteristics of ultrasound.

1. When ultrasonic waves are propagating, they have strong directionality and are easy to concentrate energy.

2. Ultrasonic waves can propagate in a variety of different media, and can propagate long enough.

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. Ultrasonic can transmit strong energy.

6. Ultrasonic waves will produce reflection, interference, superposition and resonance phenomena.

Second, the characteristics of infrasound.

1. Wide, far-reaching, able to bypass obstacles and spread far.

2. The frequency of the sound wave of infrasound is low, below 20Hz, but the wavelength is very long, and the propagation distance is also very far. It travels farther than normal sound, light, and radio waves.

First, the application of ultrasound.

1. Ultrasonic mite removal.

Researchers have found that the auditory nervous system of mites is very fragile and very sensitive to specific frequencies of ultrasound. This new type of mite removal product adopts modern microelectronic technology means, directly uses special frequency ultrasound to act on the auditory nervous system of mites, so that its physiological system is disordered, irritability, loss of appetite, and finally dying gradually.

2. Ultrasonic degreasing.

The degreasing process of placing the parts adhered to the oil stain in the degreasing solution and making the degreasing process under the action of an ultrasonic field of a certain frequency is called ultrasonic degreasing. The introduction of ultrasonic waves can enhance the degreasing process, shorten the degreasing time, improve the quality of degreasing, and reduce the consumption of chemicals. In particular, it has a significant degreasing effect on complex shape parts, small precision parts, parts with difficult dirt removal on the surface and parts made of insulating materials, which can save time-consuming manual labor and prevent damage to parts.

Second, the application of infrasound.

1. By measuring the characteristics of the faint infrasound emitted by certain organs of human and other organisms, we can understand the activities of the corresponding organs of the human body or other organisms. For example, people have developed "infrasonic diagnosis and treatment instruments" that can check whether human organs are working properly.

2. The application of infrasound in the military, using the strong penetration of infrasound to create the best that can penetrate tanks and armored vehicles. Infrasound**, generally only harms people, will not cause environmental pollution.

Encyclopedia - Ultrasound.

The hearing range of the human ear is between 20 Hz and 20,000 Hz, and the sound beyond this range is inaudible to the human ear, so people call the sound above 20,000 Hz ultrasound and the sound below 20 Hz infrasound

So the answer is: sound with a frequency higher than 20000Hz; Sound with frequencies below 20Hz