What is the main working medium of a high power infrasonic generator

Classified in the way of infrasound wave generation, infrasound** can be roughly divided into the following types: (Air explosion infrasound** is to control the sudden release of compressed air, high-pressure steam or high-pressure gas in a pulsed manner, and use the high-speed exhaust gas to stimulate the low-frequency vibration of the surrounding medium to form the required infrasound wave.) This kind of infrasound device has developed rapidly in recent years due to its small size, low frequency and easy control.

But secondly, the sound wave intensity is low, so it is effective to use it at close range. (Explosive infrasound is the use of strong infrasound waves, which can also be called infrasound bombs.) **About 50% of the energy released forms a shock wave, which attenuates and then produces an infrasonic wave.

At present, the new type of infrasound bomb is an improvement of the existing fuel-air bomb, so that the original can only form one cloud mass into several cloud masses, and can be detonated many times in a row. As long as the number of clouds and the detonation interval are controlled, the infrasound waves of the required frequency can be obtained. (Tubular infrasound** is constructed and works much like the flute in a musical instrument, when the vibration of the air column in the pipe is the same as the natural frequency of the tube itself, it can produce strong infrasound waves.)

A piston is attached to one end of the tube, driven by an electric motor or excited by an air flow, and when the wavelength of the vibration frequency of 1 4 is equal to the length of the tube, the strongest infrasonic wave can be obtained. But to produce infrasound, the tube must be long enough. (Loudspeaker infrasound** works similarly to a loudspeaker.)

A special vibrating diaphragm is used, and the vibration of the diaphragm can produce infrasound waves of a certain frequency. However, in order to produce infrasonic waves of a certain intensity, in addition to requiring a higher amplitude, the area of the diaphragm must be large enough, and its circumference must be roughly equivalent to the wavelength of infrasound. (Frequency differential beat infrasound** is to use two sound wave generators with different frequencies to work at the same time, and use the difference in their frequencies to obtain the required low-frequency infrasound waves.)

One of the methods is to use piezoelectric crystals to generate two beams of ultrasonic waves with slightly different frequencies, which act to produce high-frequency and low-frequency sound waves, the high-frequency sound waves are the sum of the two frequencies, and the low-frequency sound waves are the difference between the two frequencies, the high-frequency sound waves are quickly attenuated in the air, and the low-frequency sound waves (infrasound waves) go directly to the target. This method has a high energy conversion rate and can be made into a small **. In order to be effective, the existing ones need to further increase the intensity of infrasound waves and better solve the problems of directional focusing and miniaturization.

Sound waves, as the name suggests, are destructive by the impact of sound** (vibration frequency 20), i.e. air vibration. Therefore, the working medium should be air.

It is a sound wave that is less than 20 Hz and cannot cause human hearing. It travels at the same speed as sound waves. In many natural phenomena, such as **, typhoons, tsunamis, volcanic eruptions and other processes, infrasound waves are generated.

Anthropogenic infrasound sources also occur when nuclear** and jet aircraft are flying, as well as when moving vehicles and ships and compressors are running. All motion sickness and seasickness are also affected by infrasound waves when the car or ship is running. Infrasound waves can also be used to monitor and detect changes in the atmosphere.

Scientific studies have shown that noise pollution has a great impact on people's psychology and physiology. Therefore, in the decoration of the room, do not ignore the prevention and control of indoor and outdoor noise pollution.

Infrasound is characterized by wide range, long propagation, and strong penetration, and scientists use it to study typhoons, study atmospheric structure, etc., and militarily can use infrasound to reconnoiter nuclear explosions in the atmosphere.