Ultrasonic effect is widely used in practice, mainly in the following aspects:
① Ultrasonic examination
Ultrasonic wave has shorter wavelength than ordinary sound wave, better directivity and can penetrate opaque substances. This characteristic has been widely used in ultrasonic flaw detection, thickness measurement, distance measurement, remote control and ultrasonic imaging technology. Ultrasonic imaging is a technology that uses ultrasonic waves to present the internal image of opaque objects. The ultrasonic wave emitted by the transducer is focused on the opaque sample through the acoustic lens, and the ultrasonic wave emitted by the sample carries the information of the irradiated part (such as the ability of reflecting, absorbing and scattering sound waves), and is concentrated on the piezoelectric receiver through the acoustic lens, and the obtained electric signal is input into the amplifier, and the image of the opaque sample can be displayed on the fluorescent screen by using the scanning system. The device above is called an ultrasonic microscope. Ultrasonic imaging technology has been widely used in medical examination. It is used to test large-scale integrated circuits in the manufacture of microelectronic devices, and to display the regions and grain boundaries of different components in alloys in materials science. Acoustic holography is an acoustic imaging technology that records and reproduces the stereoscopic image of opaque objects by using the interference principle of ultrasonic waves. Its principle is basically the same as that of light wave holography, but the recording means are different (see holography). The two transducers placed in the liquid are excited by the same ultrasonic signal source, and they respectively emit two coherent ultrasonic waves: one beam becomes an object wave after passing through the studied object, and the other beam is used as a reference wave. Acoustic hologram is formed by the coherent superposition of object wave and reference wave on liquid surface. The acoustic hologram is irradiated with a laser beam, and the reconstructed image of the object is obtained by using the diffraction effect produced when the laser is reflected on the acoustic hologram. Usually, real-time observation is done by a camera and a TV set.
② Ultrasonic therapy
Ultrasonic welding, drilling, solid crushing, emulsification, degassing, dust removal, cleaning, sterilization, promoting chemical reaction and biological research can be carried out by using the mechanical action, cavitation, thermal effect and chemical effect of ultrasound, which has been widely used in various departments such as industry, mining, agriculture and medical treatment.
③ Basic research
After the ultrasonic wave acts on the medium, the acoustic relaxation process occurs in the medium. The acoustic relaxation process is accompanied by the transport process of energy between molecular degrees, which is macroscopically manifested as the absorption of sound waves (see sound waves). The characteristics and structure of matter can be explored through the law that matter absorbs ultrasonic waves, which constitutes the branch of acoustics of molecular acoustics. The wavelength of ordinary sound wave is larger than the atomic spacing in solid, and under this condition, solid can be regarded as a continuous medium. However, for ultrasonic waves with a frequency above 10 12 Hz, its wavelength can be comparable to the atomic spacing in solids, so solids must be regarded as a lattice structure with spatial periodicity. The energy of lattice vibration is quantized and called phonon (see solid state physics). The effect of ultrasound on solids can be attributed to the interaction between ultrasound and thermal phonons, electrons, photons and various quasi-particles. The generation, detection and propagation of ultrasonic waves in solid and the study of sound phenomena in quantum liquid-liquid helium constitute a new field of modern acoustics.
Sound wave belongs to one of the categories of sound and belongs to mechanical wave. Sound wave refers to a kind of longitudinal wave that can be felt by human ears, and its frequency range is 16Hz-20KHz. When the frequency of sound wave is lower than 20Hz, it is called infrasound, and when it is higher than 20 Hz, it is called ultrasonic wave.
Ultrasonic wave has the following characteristics:
1) Ultrasonic wave can propagate effectively in gas, liquid, solid, solid melt and other media.
2) Ultrasonic waves can transmit strong energy.
3) Ultrasonic waves will produce reflection, interference, superposition and * * * vibration.
4) When ultrasonic wave propagates in liquid medium, it can produce strong impact and cavitation on the interface.
Ultrasound is a member of the sound wave family. Sound wave is the propagation form of mechanical vibration state (or energy) of an object. The so-called vibration refers to the back and forth movement of the particles of a substance near its equilibrium position. For example, after the drum surface is hit, it focuses on vibration, which propagates in all directions through the air medium. This is the sound wave.
Ultrasonic wave refers to the sound wave with vibration frequency above 20KHz, which people can't hear or feel in the natural environment.
The concept of ultrasonic therapy:
Ultrasound therapeutics is an important part of ultrasound medicine. Ultrasonic energy is applied to the diseased part of human body during ultrasonic treatment, so as to achieve the purpose of treating diseases and promoting physical rehabilitation.
In the world, ultrasound is widely used in diagnostics, therapeutics, engineering, biology and other fields. Saifurui's home ultrasonic therapy machine belongs to the application category of ultrasonic therapy.
(1) engineering application >>
What are the common applications of ultrasonic technology?
The 1 dental cleaners in hospitals and dental clinics are all ultrasonic dental cleaners. Ultrasonic toothbrush is also developed according to ultrasonic cleaning technology.
Ultrasonic cleaning machine, used to clean glass and jewelry.
Three-dimensional ultrasound
It can be used for distance measurement, speed measurement, cleaning, welding, gravel and so on. It has many applications in medicine, military, industry and agriculture.
Application of ultrasonic wave
The application of ultrasonic mainly includes the following aspects:
1. Ultrasonic inspection. Ultrasonic wave has shorter wavelength than ordinary sound wave, better directivity and can penetrate opaque substances. This characteristic has been widely used in ultrasonic flaw detection, thickness measurement, distance measurement, remote control and ultrasonic imaging technology. Ultrasonic imaging is a technology that uses ultrasonic waves to present the internal image of opaque objects. The ultrasonic wave emitted by the transducer is focused on the opaque sample through the acoustic lens, and the ultrasonic wave emitted by the sample carries the information of the irradiated part (such as the ability of reflecting, absorbing and scattering sound waves), and is concentrated on the piezoelectric receiver through the acoustic lens, and the obtained electric signal is input into the amplifier, and the image of the opaque sample can be displayed on the fluorescent screen by using the scanning system. The device above is called an ultrasonic microscope. Ultrasonic imaging technology has been widely used in medical examination. It is used to test large-scale integrated circuits in the manufacture of microelectronic devices, and to display the regions and grain boundaries of different components in alloys in materials science. Acoustic holography is an acoustic imaging technology that records and reproduces the stereoscopic image of opaque objects by using the interference principle of ultrasonic waves. Its principle is basically the same as that of light wave holography, but the recording means are different (see holography). The two transducers placed in the liquid are excited by the same ultrasonic signal source, and they respectively emit two coherent ultrasonic waves: one beam becomes an object wave after passing through the studied object, and the other beam is used as a reference wave. Acoustic hologram is formed by the coherent superposition of object wave and reference wave on liquid surface. The acoustic hologram is irradiated with a laser beam, and the reconstructed image of the object is obtained by using the diffraction effect produced when the laser is reflected on the acoustic hologram. Usually, real-time observation is done by a camera and a TV set.
2. Ultrasonic therapy. Ultrasonic welding, drilling, solid crushing, emulsification, degassing, dust removal, cleaning, sterilization, promoting chemical reaction and biological research can be carried out by using the mechanical action, cavitation, thermal effect and chemical effect of ultrasound, which has been widely used in various departments such as industry, mining, agriculture and medical treatment.
3. Basic research. After the ultrasonic wave acts on the medium, the acoustic relaxation process occurs in the medium. The acoustic relaxation process is accompanied by the transport process of energy between molecular degrees, which is macroscopically manifested as the absorption of sound waves (see sound waves). The characteristics and structure of matter can be explored through the law that matter absorbs ultrasonic waves, which constitutes the branch of acoustics of molecular acoustics. The wavelength of ordinary sound wave is larger than the atomic spacing in solid, and under this condition, solid can be regarded as a continuous medium. However, for ultrasonic waves with a frequency above 10 12 Hz, its wavelength can be comparable to the atomic spacing in solids, so solids must be regarded as a lattice structure with spatial periodicity. The energy of lattice vibration is quantized and called phonon (see solid state physics). The effect of ultrasound on solids can be attributed to the interaction between ultrasound and thermal phonons, electrons, photons and various quasi-particles. The generation, measurement and propagation of ultrasonic waves in solids and the study of sound phenomena in quantum liquid-liquid helium constitute a new field of modern acoustics-
What are the applications of ultrasound?
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Ultrasonic wave:
Ultrasound therapeutics is an important part of ultrasound medicine. Ultrasonic energy is applied to the diseased part of human body during ultrasonic treatment, so as to achieve the purpose of treating diseases and promoting physical rehabilitation.
In the world, ultrasound is widely used in diagnostics, therapeutics, engineering, biology and other fields. Saifurui's home ultrasonic therapy machine belongs to the application category of ultrasonic therapy.
(1) engineering applications: underwater positioning and communication, underground resource exploration, etc.
(2) Biological applications: shearing macromolecules, bioengineering and seed treatment.
(3) Diagnostic applications: type A, type B, type M, type D, dual-function and color Doppler ultrasound, etc.
(4) Therapeutic application: physiotherapy, cancer treatment, surgery, extracorporeal lithotripsy, dentistry, etc.
Characteristics of ultrasonic wave:
1. When ultrasonic wave propagates, it has strong directivity and easy energy concentration.
2. Ultrasonic waves can propagate in different media and far enough.
3. The interaction between ultrasonic wave and sound transmission medium is moderate, and it is easy to carry the information of sound transmission medium state (diagnosis or function of sound transmission medium). (treatment)
Ultrasonic wave is a waveform, which can be used as a carrier or medium for detecting and loading information (such as B-ultrasound for diagnosis); At the same time, ultrasound is a form of energy. When its intensity exceeds a certain value, it can affect, change or even destroy the state, nature and structure of the medium that propagates ultrasonic waves (used for treatment).
The development history of ultrasound;
First, internationally:
/kloc-from the end of 0/9 to the beginning of the 20th century, after the piezoelectric effect and anti-piezoelectric effect in physics were discovered, people solved the method of using electronic technology to generate ultrasonic waves, which quickly opened a historical chapter in the development and popularization of ultrasonic technology.
1922, the first invention patent of ultrasonic therapy appeared in Germany.
1939 published a literature report on the clinical effect of ultrasonic therapy.
In the late 1940s, ultrasonic therapy rose in Europe and America. It was not until the first international conference on medical ultrasound held in 1949 that papers on ultrasound therapy were exchanged, which laid the foundation for the development of ultrasound therapy. 1956 many papers were published in the second international congress of ultrasound medicine, and ultrasound therapy has entered a practical and mature stage.
Second, the domestic side:
In China, the field of ultrasound therapy started late, and only a few hospitals carried out ultrasound therapy in the early 1950s. From 65438 to 0950, the ultrasonic therapeutic machine with the frequency of 800KHz was first used in Beijing to treat various diseases, and it was gradually popularized in the 1950s, with domestic instruments. The published literature report began at 1957. In the 1970s, various types of ultrasonic therapeutic instruments appeared in China, and ultrasonic therapy was popularized in major hospitals all over the country.
Over the past 40 years, major hospitals in China have accumulated a considerable amount of information and rich clinical experience. Especially in the early 1980s, ultrasonic extracorporeal mechanical wave lithotripsy (ESWL) and ultrasonic surgery appeared, which was a major breakthrough in the treatment history of lithiasis. Now it has been popularized and applied internationally. High intensity focused ultrasound noninvasive surgery makes ultrasound therapy occupy an important position in contemporary medical technology. In 2 1 century (HIFU), focused ultrasound surgery is regarded as the latest technology for treating tumors in 2 1 century.
Mechanism of ultrasonic treatment;
Gallbladder 1. Mechanical effect: the effect produced when ultrasonic wave propagates in medium. (The propagation of ultrasonic wave in medium is a mechanical effect produced by reflection) It can cause some reactions in the body. Ultrasonic vibration can cause the movement of substances in tissues and cells. Due to the subtlety of ultrasonic waves, cytoplasm flows, cells vibrate, rotate and rub, thus producing the function of cells, which is called "internal". This is the unique feature of ultrasonic therapy, which can change the permeability of cell membrane and the diffusion process of semi-permeable membrane, promote metabolism, accelerate blood and lymphatic circulation and improve cell ischemia. Changing the internal structure of cells leads to changes in the function of cells and softens the extension of hard connective tissue.
The mechanical action of ultrasound can soften tissues, enhance infiltration, improve metabolism, promote blood circulation, * * * nervous system and cell function, so it has unique therapeutic significance of ultrasound.
2. Warm effect: human tissues have a relatively large absorption capacity of ultrasonic energy, so when ultrasonic waves propagate in human tissues, their energy is continuously absorbed by the tissues and becomes heat, resulting in the temperature rise of the tissues themselves.
The process of heat production is not only the transformation of mechanical energy into thermal energy ... >; & gt
What's the use of ultrasound?
(1) engineering applications: underwater positioning and communication, underground resource exploration, etc. (2) Biological applications: shearing macromolecules, bioengineering and treating seeds.
(3) Diagnostic applications: type A, type B, type M, type D, dual-function and color Doppler ultrasound, etc.
(4) Therapeutic application: physiotherapy, cancer treatment, surgery, extracorporeal lithotripsy, dentistry, etc.
What is ultrasound? What are the main applications of ultrasound?
Ultrasound can be used in many places, such as cleaning, welding, ranging, imaging, obstacle avoidance and so on. . . . . . .
What are the characteristics of ultrasound? What are the main applications of ultrasound?
Ultrasonic cleaning is a physical method, which induces ultrasonic vibration in cleaning to accelerate and strengthen the cleaning effect. Ultrasonic cleaning is mainly due to ultrasonic cavitation, and the high pressure and high temperature shock wave generated by bubble explosion reduces the adhesion between dirt and the parts to be cleaned, resulting in the destruction and separation of dirt; At the same time, the vibration of bubbles can scrub the surface of the object to be cleaned, and bubbles can also drill people into vibration and make the pollution layer fall off. When some solid surfaces are attached by oil stains, the oil stains are emulsified by ultrasonic waves and quickly separated from the surfaces of the cleaned parts. Ultrasonic cavitation will produce high velocity gradient and sound flow on the surface of the cleaned parts, which can further weaken or remove boundary layer pollution. At the same time, ultrasonic vibration will also cause strong vibration of medium particles, so that the surface of the cleaned parts will be strongly impacted and the dirt will leave the surface quickly.
Ultrasonic cleaning has the characteristics of environmental protection, water saving, time saving, high efficiency, low cost and low corrosion, and has broad development and application prospects.