Where is ultrasound used?

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.

The main applications of ultrasound in medicine are: ultrasonic examination, sterilization and disinfection, atomization of liquid medicine, stone crushing, etc.

1. Ultrasonography: mainly two-dimensional and three-dimensional ultrasonography, Doppler ultrasonography, contrast-enhanced ultrasound, etc. It can examine organs and blood vessels, and diagnose whether there are diseased organs through the characteristics reflected by the instrument, combined with anatomical knowledge, pathological changes, etc.

2. Sterilization and disinfection: ultrasonic cleaning and sterilization can be carried out through the mechanical, cavitation, thermal and chemical effects of ultrasonic.

3. Nebulization of liquid medicine: such as laryngitis, tracheitis and other diseases, it is difficult to use blood flow to send drugs to the lesions, so the principle of ultrasonic humidifier can be used to atomize the liquid medicine to let patients inhale and improve the efficacy.

4. Stone crushing: The huge energy of ultrasound can be used to break the stones in the body due to violent vibration, so that they can be excreted with urine, so as to alleviate the pain and achieve the purpose of the first grade.

Ultrasonic characteristics:

Compared with audible sound waves, ultrasonic waves have the following characteristics due to their high frequency and short wavelength:

1. Good directionality.

Due to the high frequency and short wavelength of ultrasound, the diffraction phenomenon is not significant, so the propagation direction of ultrasonic waves is good, and it is easy to obtain directional and concentrated ultrasonic beams. This feature of ultrasound is not only convenient for directional emission to seek targets, but also convenient for focusing to obtain large sound intensity.

3. Strong penetration.

The experiment points out that the attenuation of ultrasonic wave in gas is very strong, but the attenuation in liquid and solid is very small, and the absorption coefficient of the medium increases with the increase of the frequency of the wave, so when the frequency of ultrasonic wave increases, the penetration ability will decrease.

4. Cause cavitation.

When ultrasonic waves propagate in liquids, because ultrasonic waves are dense vibration waves like sound waves, in the process of propagation, the liquid is sometimes stretched and sometimes pressed. Liquids can withstand pressure, but their ability to withstand tensile forces is poor.

When the wave intensity of the ultrasonic wave is strong enough, the liquid cannot withstand the tensile force and breaks (especially where there are impurities and bubbles), resulting in a cavity close to vacuum or containing a small amount of gas.

The applications of ultrasonic are: ultrasonic treatment, ultrasonic inspection, ultrasonic cleaning, ultrasonic humidifier, ultrasonic degreasing, ultrasonic medical examination, ultrasonic industry automation control, etc. Ultrasonic sizzle wave is a mechanical wave with a very short wavelength, generally shorter than 2 cm in air.

It must rely on a medium for propagation and cannot exist in a vacuum. It travels farther in water than in air, but because of its short wavelength, it is extremely easy to lose and scatter in air.

The propagation laws of ultrasonic waves such as reflection, refraction, diffraction, and scattering in the medium are not fundamentally different from the laws of infrasound and audible sound waves. But the wavelength of ultrasound is very short, only a few centimeters, or even thousandths of a millimeter.

Ultrasound can improve the permeability of biofilms, and the permeability of cell membranes to potassium and calcium ions changes strongly after ultrasound. Thus enhancing the biofilm diffusion process, promoting the exchange of substances, accelerating metabolism, and improving tissue nutrition.

Ultrasonic characteristics: 1. When ultrasonic waves are propagating, the wavelength is short and anisotropic. 2. Ultrasonic waves can propagate in different media of various slag shoots, and can propagate far enough. 3. Ultrasonic waves will produce reflection, interference and superposition.