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MSU student makes flag to loudspeaker

MSU student makes flag to loudspeaker
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Christian Boas
If you like to listen to music, you might soon hear it sound out of the most inconspicuous objects. The invention of Nelson Sepulveda and his team at Michigan State University make this possible. The researchers had already presented a very thin computer keyboard. Now they have recognized that this technology is also suitable for playing sounds and music.

    “This is the first energy to convert, ultra-fast, flexible, scalable, and bidirectional. This means that it can convert mechanical energy into electrical energy and electrical energy into mechanical energy, “explains Sepulveda. The technology behind this is called ferroelectret nanogenerator or FENG.

forms of energy
While in the computer keyboard the mechanical energy has been converted into electrical energy in the form of the finger pressure, the vibrations of the sound waves are generated by the microphone, which become electrical energy. The loudspeaker works exactly the opposite way and is first supplied with electrical energy – through an iPad and an amplifier, music has been “pumped” into a piece of fabric, in which case a flag “pumped” – and then converted into mechanical energy in the form of sound waves.

Sepulveda and his colleague Wei Li can well imagine that one day foldable loudspeakers will be used instead of large boxes, which are simply glued to the wall as required.

    “Or imagine a newspaper where the individual pages are microphones and loudspeakers. You could have a language-driven newspaper talking to you. The device is so sensitive to vibrations that it intercepts the frequency components of the voice, “says Sepulveda.

Base material for the FENG is a silicon wafer, which is provided with various thin layers of environmentally friendly substances, including silver, polyamide and polypropylene ferroelectret. Ions are added to each layer so that the device contains charged particles. Electrical energy is generated when the device is compressed by human movements or mechanical energy.

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