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MEMS chip enables battery-free sensors

12/7/2011 11:38 PM EST
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madog
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re: MEMS chip enables battery-free sensors
madog   12/9/2011 4:55:21 PM
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Unless the heart patient leads a highly sedentary life style

Tim W
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re: MEMS chip enables battery-free sensors
Tim W   12/8/2011 9:59:17 PM
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The application is usually referred to as Tire Pressure Monitoring System (TPMS), and the sensors are secured to the wheel, with a counterweight on the opposite side, and a nice, sturdy zip tie around the whole works, to make sure it stays in place (if the adhesive fails!) My personal favorite for the system was an RFID-type of system that used an evacuated cavity which would deform according to the pressure in the tire, thus changing its' resonant frequency. A transmitter in the wheel well supplied the stimulus, and the re-radiated frequency was proportional to the pressure. Simple, and no batteries.

dieseltaylor
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re: MEMS chip enables battery-free sensors
dieseltaylor   12/8/2011 9:03:31 PM
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One of the long term problems for embedding into tyres is the machinery necessary to do it in existence? RFID tags have been in existence for decades and are only now appearing in manufactured tyres. Pirelli promised a piezo tyre which should have launched last year but I have heard and seen nothing of it. I note the article says car tyres and does this mean that truck tyres are more of a problem? Distance to transmit, more rigidity in the tyre, ability to survive recapping. Tyres are a complex world so I would be not surprised to see 5-10 years before this may become commercial.

Peter Clarke
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re: MEMS chip enables battery-free sensors
Peter Clarke   12/8/2011 6:12:34 PM
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@globalfish. This MEMS chip has been optimized for the thump-thump-thump of a tire going round at 100s of revs per minute....so no! My understanding is that there are many different types of pace maker and modes of operation and energy requirements but it should be possible to find some form of energy scavanging principle that can help. But you might want batteries, at least as a back up.

globalfish
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re: MEMS chip enables battery-free sensors
globalfish   12/8/2011 5:21:42 PM
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Is it possible to this MEMES chip in medical electronic application? such as pacemaker (no need to change batteries).

prabhakar_deosthali
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re: MEMS chip enables battery-free sensors
prabhakar_deosthali   12/8/2011 7:13:29 AM
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This is really a good development. Energy harvesting techniques are really useful for such applications where micro power is required. Supplying such a power through conventional batteries will sometimes be bulky. Moreover the natural drain from the battery will be much more than the actual circuit operating requirement. In times to come more and more such energy harvesting applications especially in standalone systems such as Automotive or mobile devices will become feasible.

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