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Materials & Assembly
Smart Paint Detects Microscopic Cracks
2/13/2012

Changes in conductivity in highly aligned carbon nanotubes could help a new paint detect cracks in structures like the foundation of wind turbines, such as this one in Romania's Tihuta Pass.   (Source: Rsocol/Wikipedia Commons)
Changes in conductivity in highly aligned carbon nanotubes could help a new paint detect cracks in structures like the foundation of wind turbines, such as this one in Romania's Tihuta Pass.
(Source: Rsocol/Wikipedia Commons)

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Rob Spiegel
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Re: Self-charging batteries
Rob Spiegel   2/16/2012 1:30:36 PM
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That makes sense, using it on the stove, Ann. Is that your sole source of heat? If so, does the fan distribute throughout the house or just the room with the stove?

Ann R. Thryft
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Re: Smart Paint Detects Microscopic Cracks
Ann R. Thryft   2/16/2012 1:19:42 PM
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I'm with you--I like finding out about technologies that can be used for other applications. In this case, what I've learned about aerospace composites, specifically carbon fiber types, makes me hesitate to think this one can be applied to them, since fault detection seems so different with them.


vimalkumarp
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Smart Paint Detects Microscopic Cracks
vimalkumarp   2/16/2012 1:06:17 PM
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yes i agree with you that it is a different set. But i was just trying to explore the possibilities of this smart paint in SHM applications, Thanks for the clear analysis and inputs

Ann R. Thryft
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Re: Smart Paint Detects Microscopic Cracks
Ann R. Thryft   2/16/2012 12:51:47 PM
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vimalkumarp, that's an interesting observation. It may be possible to adapt this paint to detection of cracks in aircraft. However, I'd guess that it's a different problem set with a different solution. That's seems to be true in the case of composite fault detection as I've reported on here:

http://www.designnews.com/author.asp?section_id=1392&doc_id=238056

http://www.designnews.com/document.asp?doc_id=236816

http://www.designnews.com/author.asp?section_id=1386&doc_id=236236


Ann R. Thryft
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Re: Self-charging batteries
Ann R. Thryft   2/16/2012 12:50:15 PM
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Thanks, Rob. I have heard about the ones that work by harvesting energy from body movement and/or heat. Somehow that seems easier to immediately grasp than the ones that get charged by ambient vibrations. This article made the ambient vibrations method clear: it's piezoelectric, which makes total sense, and I should have guessed that. On top of my wood stove is a piezoelectric fan that creates electricity from the stove's heat and redistributes that heat faster throughout the room. The efficiency increase actually saves me a bit on firewood.


vimalkumarp
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Smart Paint Detects Microscopic Cracks
vimalkumarp   2/16/2012 5:27:13 AM
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This smart paint can be of great use in SHM ( Structural Health Monitoring) systems that can be implemented on aircrafts and other aerospcae structures. Smart paint with the WSN ( wireless Sensor Network ) can improve the maintenance operation and will be a boon to the aircraft industry

 

Rob Spiegel
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Re: Self-charging batteries
Rob Spiegel   2/15/2012 3:40:53 PM
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Here's an article about these batteries that get charged by ambient vibrations:

http://www.technewsdaily.com/3083-new-battery-charges-itself-from-vibrations.html

I first learned about them while doing a story on remote sensors. Self-charging batteries are also being developed for medical applications for devices that are put into people's bodies. Those are chaged based on the temperature difference between the human body and the world outside.

Ann R. Thryft
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Re: Self-charging batteries
Ann R. Thryft   2/15/2012 3:19:24 PM
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I know next to nothing about how these self-charging batteries work, or what the actual energy harvesting techniques involve. I'd love to know more. It sounds like yet more sci-fi comes true.


Rob Spiegel
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Re: Self-charging batteries
Rob Spiegel   2/15/2012 2:49:28 PM
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Yes, I was very surprised to learn that batteries could be charged by slight ambient vibration -- such as a truck going by on a nearby freeway, or cars traveling over a bridge. I would imagine this is possible in part because the sensors require very little energy.

Ann R. Thryft
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Re: Self-charging batteries
Ann R. Thryft   2/15/2012 12:17:53 PM
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Rob, self-charging batteries on remote sensors makes a lot of sense, thanks for the input. I think what we're also seeing in this case, as well as the ones you describe, is more attention being paid to designing total systems that are simpler and more self-sustaining. Totally cool! And green without any "washing."


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