What is Infrasound?

Infrasound is sound with a frequency below 20 Hz. Infrasound is the science that studies the generation, propagation, and reception of infrasound waves in media, and their effects and applications. Infrasound waves exist widely in nature and human activities. It is through the destruction caused by infrasound that people gradually understand its magical power. In 1883, the Crato volcano erupted in Indonesia. A huge eruption caused a powerful infrasound wave. Three weeks on Earth, the infrasound wave was detected at an observation station tens of thousands of kilometers away from the volcano.

The effects of turbulence will cause the attenuation of infrasound waves, but their effects are small and usually negligible. Because the frequency of infrasound is low, the atmosphere

As early as during World War I, the Germans launched a warship to patrol the sea. Basically, a patrol was only a few weeks. There was an accident. When the base talked to the warship, no one came to answer and answer. This caused the base to worry, so it sent dozens of small submarines to inspect it. When these small submarines reached the patrol waters of the warships, they found the sea calm and calm, but when they boarded the warships, they found the bodies of the seamen, all of them lying on the deck, with extremely painful expressions on their faces and no body on their bodies. Any scars, so they took the corpse back to dissect, and found that the internal organs of the dead seafarer were all broken.

Decades later, physicists discovered the true culpritinfrasound waves. At the time of the incident, a strong earthquake occurred on the bottom of the sea. Because the hearing range of the human ear was between 20Hz and 20000Hz, infrasound waves generated by the earthquake could not be heard. The destructive power of the seafarers shattered the internal organs of the seafarers and killed them. ^[1]

Submarine storms, volcanic eruptions, large meteorite landings, tsunamis, lightning flashes, waves hitting shores, underwater vortices, air turbulence, tornadoes, magnetic storms, aurora, etc. may all be accompanied by infrasound waves; artillery launches in human activities, Missile flying, nuclear explosions, ship navigation, car galloping, high-rise buildings and bridges swaying, even blowers, mixers, and loudspeakers can generate infrasound waves. ^[1]

Atmospheric temperature density and

The infrasound has a low frequency, a long wavelength, and a long distance. Infrasound has a slow energy loss during the propagation process, and high-energy infrasound has great destructive power. ^[1]

There are two main types of infrasound weapons developed: one is a neurotype infrasound weapon, whose oscillation frequency is the same as that of the human brain;

Before the Second World War, infrasound had been used to detect the position of artillery. However, it was not until the 1950s that other aspects of its application began to be noticed. Its application prospects are very broad and can be roughly divided into the following Aspects:

1. By studying the characteristics and mechanism of infrasound waves generated by natural phenomena, we can better understand the characteristics and laws of these phenomena. For example, people use the characteristics of measuring infrasound waves generated by aurora to study the laws of aurora movement.

2. Use the received infrasound waves from the measured sound source to detect its position, size, and other characteristics. For example, by receiving infrasound waves generated by nuclear explosions, rockets firing artillery or typhoons to detect relevant parameters of these infrasound sources.

3 Predict natural catastrophic events. Many catastrophic phenomena, such as volcanic eruptions, tornadoes, and thunderstorms, may radiate infrasound waves before they occur. Therefore, it is possible to use these precursor phenomena to predict disaster events.

4 When infrasound propagates in the atmosphere, it is easily affected by atmospheric media. It is closely related to atmospheric wind and temperature distribution. Therefore, by measuring the propagation characteristics of natural or artificial infrasound waves in the atmosphere, the nature and regularity of certain large-scale meteorology can be detected. The advantage of this method is that it can continuously detect and monitor a large area of the atmosphere.

5. These activity characteristics are detected by measuring the interaction of infrasound waves with other fluctuations in the atmosphere. For example, in the ionosphere, the effect of infrasound waves causes the wave propagation to be disturbed progressively. The characteristics of infrasound waves can be further revealed by measuring the characteristics of infrasound waves. Similarly, by measuring the effects of sound waves, gravity waves, or other waves, you can study the laws of these waves.

6. Not only can people and other organisms have some kind of response to infrasound, but some of their organs also emit weak infrasounds, so the characteristics of these infrasound waves can be used to understand the activities of the corresponding organs of the human body or other organisms Happening.

7. Infrasound weapon is a kind of weapon device driven by a high-energy amplifier to drive a special speaker to emit low-frequency sound waves with a high power of less than 20 Hz, that is, infrasound waves. Generally, it is composed of infrasound wave generator, power device and control system. ^[1]

The content of Baidu Encyclopedia is edited by netizens. If you find your entry is inaccurate or incomplete, you are welcome to use my entry editing service (free of charge) to participate in the correction. Go Now >>