by A new breakthrough in sensor technology could potentially save millions of batteries and reduce waste. Researchers led by Marc Serra-Garcia and ETH geophysics professor Johan Robertsson have developed a mechanical sensor that operates without the need for an external power source. The sensor harnesses the vibrational energy present in sound waves to generate a small electrical pulse, which can be used to activate electronic devices. This innovation has the potential to revolutionize various industries, from infrastructure monitoring to medical devices.
Traditionally, sensors used in infrastructure monitoring or medical devices rely on batteries for power. Once these batteries are depleted, they are often discarded, contributing to the global waste problem. According to an EU study, it is estimated that by 2025, approximately 78 million batteries will be discarded daily. The new sound-powered sensor offers a sustainable alternative, eliminating the need for frequent battery replacements.
The sensor operates purely based on mechanical vibrations induced by. When specific words or tones are spoken or generated, the sensor detects the corresponding sound waves and vibrates in response. This vibrational energy is then converted into a tiny electrical pulse, which can be utilized to switch on electronic devices that have been switched off.
The researchers have already patented a prototype of the sensor, which is capable of distinguishing between the spoken words “three” and “four”. By measuring the differences in sound energy that resonates with the sensor, it can determine which word was spoken. This demonstrates the sensor’s ability to recognize specific commands and trigger corresponding actions. The researchers aim to further develop the sensor to distinguish between up to twelve different words and commands.
Compared to the initial prototype, newer versions of the sensor are significantly smaller, approximately the size of a thumbnail. The researchers continue to work on miniaturizing the sensor further. What sets this sensor apart is its structure rather than the materials used. It is classified as a metamaterial, comprising multiple identical or similarly structured plates connected through tiny bars that act as springs. The unique design of these microstructured plates determines whether a particular sound source will set the sensor in motion.
The potential applications for these battery-free sensors are vast. They could be used for earthquake or building monitoring, detecting sound patterns that indicate structural damage. Additionally, they could be employed in monitoring decommissioned oil wells to identify gas leaks by detecting specific sound signatures. By eliminating the need for constant electricity consumption, these mechanical sensors offer a cost-effective and low-maintenance solution.
One of the noteworthy features of these sound-powered sensors is their sustainability. The sensors are made purely of silicone, containing no toxic heavy metals or rare earth elements found in traditional electronic sensors. This makes them environmentally friendly and reduces the environmental impact associated with sensor production and disposal.
The development of these sound-powered sensors shows great promise in reducing battery waste and improving the efficiency of various industries. By harnessing the vibrational energy of sound waves, these sensors can operate without the need for batteries, providing a sustainable and cost-effective alternative. As the technology continues to advance, these sensors could revolutionize infrastructure monitoring, medical devices, and other fields, contributing to a greener and more sustainable future.
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1. Source: Coherent Market Insights, Public sources, Desk research
2. We have leveraged AI tools to mine information and compile it
