A Non-Battery Vibration Chip That Can Run For Months Without Battery Replacement

A Non-Battery Vibration Chip That Can Run For Months Without Battery Replacement

A non-battery vibration chip that can run for months without battery replacement would be a boon to industrial maintenance teams who have to change hundreds of wireless sensors throughout their facilities.non-battery vibration chip The new MIT-developed chip harvests power from multiple sources, including heat and vibration, to keep circuits running. Unlike other chips, which require separate controls for each energy source, the new device can combine control circuitry for all of them on a single chip.

The key to the chip is that it runs in two different modes -- minimum-energy and minimum-power.non-battery vibration chip When the chip has access to battery power, it operates in minimum-energy mode to maximise its efficiency. When the battery runs out of juice, however, it switches over to minimum-power mode. In this state, the chip consumes a tiny amount of energy -- about half a nanoWatt, or a billion times less than the power consumption of a smartphone during a call.

Many industrial maintenance departments use vibration analysis to identify and isolate the root cause of anomalous machinery behavior, but the granularity of vibration data limits how quickly problems can be pinpointed.non-battery vibration chip This can lead to a delay in isolating the issue and dispatching the right resources to fix it. A new sensor that is capable of continuously sampling vibration data in real time could help to resolve these issues faster and more effectively.

Currently, MEMS-based accelerometers are the most common vibration sensor technology for industrial applications. These devices are lithographically fabricated and allow the integration of the sensor engine with supporting electronics on a single chip, which saves space and reduces cost. They also deliver very high levels of accuracy and reliability.

While MEMS-based vibration sensors are the industry standard for industrial applications, they have a number of drawbacks. For example, they tend to have a narrow frequency response. In addition, they are usually tuned to the main frequency of an external excitation, which limits their ability to harvest energy from ambient vibrations. A new technology, called a two-degree-of-freedom (2DoF) velocity-amplified electromagnetic (EM) vibration energy harvester, has been developed to address this issue.

The 2DoF EM-VEH harvester is built around a sealed cavity containing a sample of gas molecules that is heated by a thermopile and bracketed by thermal sensors. When the device is subjected to vibration, the molecules are accelerated so that their distribution becomes asymmetric. This changes the distribution of temperature across the asymmetric gas mass, which in turn changes the amplitude of the sensor output. This amplification can be used to generate a tiny electrical pulse, which is used to activate the sensor. A simple circuit then converts the pulse to an acceleration signal. The sensor can then be used to monitor a rotating machine for abnormal vibration behavior. The sensor can be used to detect vibration in a wide range of industries, from mining and aerospace to manufacturing, transport and energy.

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