Does sonar use ultrasound or infrasound?

Ultrasound, ultrasonic waves encounter many objects (such as the bottom of the sea, hulls, etc.) will return along the original route, be received by the receiver, and can be used for radar bats also use ultrasound!

Infrasound, which is sound at a lower frequency than what the human ear can hear, is harmful to the human body because its frequency is the same as that of some human organs, which resonates with those organs and can cause problems in those organs

Popular science] inaudible sounds - infrasound and ultrasound.

Sonar is divided into active sonar and passive sonar. Active sonar evolved from a simple echo detection instrument, which actively emits ultrasonic waves, and then collects echoes for calculation, which is suitable for detecting icebergs, reefs, shipwrecks, sea depths, fish, mines, and hidden submarines with engines turned off; Passive sonar, on the other hand, evolved from a simple hydrophone, which listens to the noise emitted by the target and determines the location and certain characteristics of the target, which is especially suitable for submarines that cannot make sound to expose themselves and want to detect the activities of enemy ships.

Sonar is made by people taking advantage of the advantages of ultrasound with good directionality and strong penetration.

1. When ultrasonic waves are propagating, they have strong directionality and are easy to concentrate energy.

2. Ultrasonic waves can propagate in a variety of different media, and can propagate long enough.

3. The interaction between ultrasound and the sound transmission medium is moderate, and it is easy to carry information about the state of the sound transmission medium.

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Sonar uses ultrasound. Sonar is one of the applications of ultrasound, which uses the characteristics of strong directionality and long propagation distance of ultrasonic waves for distance measurement.

The sound frequency of ultrasound is higher than 20000Hz, which has a wide range of applications in modern life, while the sound of infrasound waves is harmful to the human body.

Due to the short range of other detection methods, the penetration ability of light in the water is very limited, and even in the clearest seawater, people can only see objects within tens of meters to tens of meters; Electromagnetic waves also decay too quickly in water, and the shorter the wavelength, the greater the loss, even if high-power low-frequency electromagnetic waves are used, the rough space can only propagate a few tens of meters.

However, the attenuation of sound waves propagating in the water is much smaller, in the deep-sea channel, a bomb of a few kilograms, 20,000 kilometers away can also receive a signal, low-frequency sound waves can also penetrate the seabed thousands of meters of the formation, and get the information in the formation. No more effective means of measuring and observing in water than sound waves has been found.