Recently, scientists in the United States used graphene as a material to create ultra-thin ultrasonic transmitters and receivers. The system gives humans the bat-like ability to accurately sense and measure the distance and speed of things around the body with sound.
Bats and some sea animals can use high-frequency sound for echo positioning or information exchange. They can transmit the ultrasound generated from the larynx through the mouth or nose and use the returned sound waves to orient and determine the position, size, and movement of nearby objects. However, due to physiological conditions and technical limitations, humans have not been able to fully utilize this skill. Humans can hear sounds in the frequency range of 20 to 20,000 hertz, while bats can hear sounds in the frequency range of 9,000 to 200,000 hertz.
According to the University of California, Berkeley's official website reported on the 7th, the school physicist Alex Settle monolayer of graphene as a diaphragm, prepared to significantly expand the human hearing ability of the system. The system consists of an ultrasonic transmitter and a receiver. The receiver can sense the lower limit of the sound frequency range well below 20 Hz and the upper limit exceeds 500,000 Hz. Researchers use the system to successfully capture the sounds of bat tweets that humans can not hear because of their high frequency and turn them into sounds that humans can hear.
Zhou Qin, a member of the research team, said: "Graphene films have a very wide range of sound-frequency perceptions and can generate intense pulsations that allow them to measure distances more accurately than with traditional methods."
Professor Michel Yeltseff, a bat expert at the University of California, Berkeley, says graphene enables researchers to feel a steady, steady sound over a wide range of frequencies. This system is of great importance for the study of auditory signals in the high frequency band and enables humans to study the auditory impulses used by bats in more detail.
Settle pointed out that hi-fi enthusiasts will also enjoy the joy of graphene speakers and headphones. This system will provide them with a more comfortable listening experience. With the development of graphene technology, it will be a breeze to make more devices based on graphene.
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To continuously get rid of the limits of their own organs and to perceive and recognize the world in a more rich and accurate way is an important direction for technological development such as telescopes, sonars, thermometers and the like. The advent of the Internet of Things era provides us with more technical choices and financial support for the expansion of our perception. The universal material of graphene has naturally become an important direction. This study may make "auditory" another area overturned by new technologies and reshape the headphone and speaker market. The future of the technology will be more widely used, when we immersed in pleasant music, in the depths of the sea, the submarine sonar is also more insightful.
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