Acoustic Energy Harvesting

Hello there,

For my dissertation I chose the topic Acoustic Energy Harvesting, and through my research I encountered a person whom has become my friend and partnership for future projects. He is a Sweddish engineer and a Youtuber, he shares his insight about science on his videos, check him out, all his videos are very interesting. The first video he made upon Acoustic Energy Harvesting inspired and fortified my research on this subject:

I contacted him via Youtube messages and I asked him if he could make another video in which the acoustic energy is harvested in a capacitor through a circuit, using a rectifier. He answered with a positive response, and a few days later he uploaded the video:

He inspired to write about the methodology of acoustic energy harvesting. This topic has hooked me and I love to learn more and more, I am eager to delve into AEH for life time.

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A microphone makes use of soundwaves to generate electrical signal; the soundwaves flow through the capsule and move the diaphragm by vibration, affecting as well the coil, causing a magnetic field. This produces a current in the coil through electromagnetic induction (in the case of dynamic microphones). Here is when the sound is converted into electricity, generating a low amount of power. To even the low power generated, the microphone is an amplified using a wide assorted of devices, as preamps, interfaces, among others. Depending on the inhabiting elements within the capsule, the microphone will respond dissimilar to frequencies to the audio spectrum. Conversely the speaker works reversing the microphone’s principle. When an AC signal is applied to the voice coil of a speaker, the induced magnetic field causes the coil to be repelled by the magnet as it moves, moving the cone, membrane and the coil. This movement alters the air molecules creating soundwaves. By reversing the setup of the speaker, the microphone’s principle arises, however it is admitted that the amount of voltage generated is very small; microphones are sensitive transducers composed by fragile elements, not suitable for the purpose in mind, since the level pressure at they would be expose would break them. Speakers can be recycled for the hypothetical prototype since they are rough and they may be found in an assorted range of characteristics.

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