Where is ultrasound used and what is it? What are the areas where it is used?

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Ultrasound is a special type of sound wave, which means that it exceeds the upper limit of the sound that a person can hear, and it is used in many fields.

Sound waves that vibrate more than 200,000 times per second and are not felt by the human ear are called ultrasounds. Ultrasound, like a normal sound, can travel in one direction and is able to pass through objects, and when it encounters an obstacle, it will emit an echo, and different obstacles will emit different echoes.

Based on this characteristic, ultrasound has gained a wide range of applications, most commonly known in the medical field.

1. Application in the medical field.

In medicine, ultrasound can be used to detect the body. After the ultrasonic waves enter the human body, because there are many interfaces inside the human body, the ultrasonic waves will produce reflection, refraction, scattering and other phenomena when they enter the human tissues, and a part of the ultrasonic waves will return to the detector and appear on the screen after a series of processing.

In addition, people also use ultrasound to break the liquid medicine used for asthma into very fine mist droplets, so that the liquid medicine is easier to enter the deep part of the trachea, the efficacy is greatly improved, and it is easier to be absorbed by the human body.

2. Application in the field of food.

Through ultrasound, the packaged cans can be sterilized, and under the action of ultrasound, the bacteria will be "dismembered" because they cannot withstand the strong vibration. The use of ultrasound to treat the wine allows the wine to age quickly.

Freshly salted pork is treated with ultrasonic, and after ultrasonic treatment, it can be marinated for one hour to achieve a fermentation effect of about 15 days.

3. Application in the field of agriculture.

Ultrasonic treatment can improve the germination rate and harvest of seeds, because during the propagation of ultrasonic waves, due to the molecular vibration of the medium, the chemical reaction or the arrangement of the molecules changes, resulting in changes in the properties of some substances.

Ultrasound is sound waves with frequencies higher than 20,000 Hz. Which fields: Ultrasonic is used in the measurement and inspection of various physical and chemical parameters, such as ultrasonic flaw detection, ultrasonic leak detection, ultrasonic ranging, etc.

It can also use high-intensity ultrasonic waves to change the properties and state of substances, such as ultrasonic drilling, ultrasonic cleaning, ultrasonic welding, ultrasonic crushing, etc. Due to its high intensity and high power, this ultrasound is also known as power ultrasonic.

Ultrasound is a type of sound that is not heard by the human ear. Ultrasound is widely used in many fields, such as in medicine, ultrasound can be used to examine the body. On board it is also possible to use ultrasound to detect submarines, torpedoes, schools of fish, and much more.

This refers to sound waves with frequencies higher than 20,000 hertz. It can be applied to physical and chemical aspects. Ultrasonic flaw detection, ultrasonic leak detection, ultrasonic ranging, ultrasonic drilling, ultrasonic cleaning, ultrasonic welding, can achieve a particularly wide range of functions.

1) Engineering applications: underwater positioning and communication, underground resource exploration, etc.

2) Biological applications: shearing macromolecules, bioengineering and seed treatment, etc.

3) Diagnostics applications: A, B, M, D, double power and color ultrasound, etc.

4) ** Applications: physiotherapy, cancer treatment, surgery, extracorporeal lithotripsy, dentistry, etc.

Use of ultrasound: Ultrasound testing.

Sonication. The mechanical, cavitation, thermal and chemical effects of ultrasonic can be used for ultrasonic welding, drilling, solid crushing, emulsification, degassing, dust removal, descaling, cleaning, sterilization, promoting chemical reactions and biological research, etc., which have been widely used in various departments such as industry and mining, agriculture and medical treatment.

Basic research. Ultrasound can also be used for radar detection. Cleaning delicate items, such as clocks and watches, can use ultrasound to break up gallstones in the patient's body, and ultrasound can also be used to measure distance.

Infrasound applications. The main aspects are as follows:

1 Study the characteristics and production mechanism of natural infrasound, ** natural disaster events For example, the infrasound waves produced by the friction between typhoons and waves, because it propagates much faster than the movement speed of typhoons, therefore, people use an instrument called "jellyfish ears" to monitor the infrasound waves emitted by storms, which can be alerted before the arrival of storms Using similar methods, natural disasters such as volcanic eruptions and thunderstorms can also be predicted

2 By measuring the propagation characteristics of natural or man-made infrasound in the atmosphere, the nature and law of certain large-scale meteorological processes such as sandstorms, tornadoes and disturbance of electromagnetic waves in the atmosphere can be detected

3 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

4 The application of infrasound in the military, using the strong penetration of infrasound to create a ** that can penetrate tanks and armored vehicles, infrasound ** - generally only harms personnel and will not cause environmental pollution.

Ultrasonic characteristics: high frequency, harmless to the human body, large amount of information, but weak penetration.

Infrasonic characteristics: It is easy to cause resonance of organs in the human body, cause damage to the human body, and has strong penetrating power.

Note: Neither ultrasound nor infrasound can be heard by the human ear.

1. Ultrasonic humidifier: ultrasonic waves pass into the water tank, and 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 indoor air humidity.

2. Ultrasonic ranging: ultrasonic waves have strong directionality and are easy to reflect when encountering obstacles, so the ultrasonic locator can detect the position of submarines, fish schools and the depth of the ocean.

3. Ultrasonic scaling: The high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation through the transducer, and then propagated to the medium, destroying the insoluble dirt and dispersing it in the cleaning solution.

Extended Information: Ultrasound waves travel much more energy than audible sound. Because when the sound wave reaches a substance, the molecules in the substance also vibrate due to the action of the sound wave, and the frequency of the vibration is the same as the frequency of the sound wave, so the molecular vibration frequency determines the speed of the molecular vibration, and the higher the frequency, the greater the speed.

In addition to the mass of the molecule, the energy is also proportional to the square of the vibration speed of the molecule, and the vibration speed is related to the frequency of the molecule's vibration, so the higher the frequency of the sound wave, that is, the higher the energy obtained by the substance molecule. The frequency of ultrasound waves can be much higher than that of sound waves, so ultrasound can cause more energy to be obtained by the molecules of matter. This shows that the ultrasound itself can supply a large enough amount of energy to the substance.

Pulse reflection ultrasonic tester.

Type A pulse reflection ultrasonic tester for the inspection of forged steel and thick steel plates.

Breakthroughs have been made in the main properties such as sensitivity, resolution and amplifier linearity by using ultrasonic detectors, and the detection of welded joints has been well solved.

Large-scale production products such as boards and sticks have developed automatic detection systems, equipped with automatic alarms, records and other devices, and developed B-type displays and C-type displays.

Digital ultrasonic instruments, time-of-flight ultrasonic testing, ultrasonic phased array technology.

In terms of testing materials, metal materials and non-metallic materials, manufacturing processes, castings, welded parts, adhesive parts, composite components, etc., can be plates, bars, pipes, etc. from the shape of the detection object, and the thickness is as small as a few millimeters and as large as a few meters, which can be both near-surface defects and internal defects.

1. Using the mechanical action and cavitation of ultrasonic, ultrasonic welding, drilling, solid crushing, emulsification, degassing, degreasing, descaling, cleaning, sterilization, etc., have been applied in various departments such as industry and mining, agriculture and medical care.

2. The ultrasonic application principle of cleaning is the short-wave signal sent by the ultrasonic generator, which is converted into short-wave mechanical waves by the transducer and propagated to the medium. When the group particles are wrapped in oil and adhere to the surface of the cleaning parts, the oil is emulsified, and the solid particles are separated, so as to achieve the purpose of purifying the surface of the cleaning parts.

3. In the dry winter of northern China, if the ultrasonic wave is passed into the water tank, the mechanical wave 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 indoor air humidity, which is the principle of ultrasonic humidifier. For diseases such as pharyngitis, tracheitis, etc., it is difficult to use the blood flow to make the drug reach the diseased part, and the principle of humidifier is used to atomize the liquid medicine and let the patient inhale, which can improve the efficacy. In the case of high power, the huge energy of ultrasound can also make the stones in the human body broken under the action of mechanical waves, so as to alleviate the pain and achieve the best purpose.

Ultrasound is used in medicine to sterilize and disinfect items.

It 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 is a kind of sound wave with a frequency higher than 20,000 Hz (hertz), it has good directionality, strong reflection ability, easy to obtain more concentrated sound energy, and travels farther in water than in the air.

Sound waves are the propagating form of the state (or energy) of the mechanical vibration of an object. 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.