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Posted by Mitch Berkson on January 9, 2006, 1:46 pm
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B1ackwater wrote:
>
> First, does anyone know what that plastic is that they make
> those condensation-resistant bathroom mirrors out of ? If
> I put the Sharp sensors behind a thin sheet of that ... no
> more condensation problems. (power-consumption IS an issue
> here so heated optical windows are out of the question)
Maybe this stuff is ready. From http://web.mit.edu/newsoffice/2005/fog.html
"Foggy windows and lenses are a nuisance, and in the case of automobile
windows, can pose a driving hazard. Now, MIT scientists may have found a
permanent solution to the problem. The team has developed a unique polymer
coating--made of silica nanoparticles--that they say can create surfaces
that never fog.
The transparent coating can be applied to eyeglasses, camera lenses, ski
goggles ?K even bathroom mirrors, they say. The new coating was described
Aug. 29 at the national meeting of the American Chemical Society."
Mitch
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Posted by B1ackwater on January 9, 2006, 2:50 pm
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On Mon, 9 Jan 2006 13:46:43 -0500, "Mitch Berkson"
>B1ackwater wrote:
>>
>> First, does anyone know what that plastic is that they make
>> those condensation-resistant bathroom mirrors out of ? If
>> I put the Sharp sensors behind a thin sheet of that ... no
>> more condensation problems. (power-consumption IS an issue
>> here so heated optical windows are out of the question)
>
>Maybe this stuff is ready. From http://web.mit.edu/newsoffice/2005/fog.html
>
>"Foggy windows and lenses are a nuisance, and in the case of automobile
>windows, can pose a driving hazard. Now, MIT scientists may have found a
>permanent solution to the problem. The team has developed a unique polymer
>coating--made of silica nanoparticles--that they say can create surfaces
>that never fog.
>The transparent coating can be applied to eyeglasses, camera lenses, ski
>goggles ?K even bathroom mirrors, they say. The new coating was described
>Aug. 29 at the national meeting of the American Chemical Society."
I'd heard about that ... but they don't exactly have
tubes of the stuff down at K-Mart yet.
There was another approach, I believe using flourine
gas applied to the surface of the plastic. Not really
a do-it-yourself kind of thing however. Both techiques
creat a hydrophobic nano-roughened surface that H2O
doesn't properly 'fit' into.
They were *supposed* to have diamond coatings by now
also for eyeglasses and such - created by decomposing
methane and H2 at certain temperatures and pressures.
Deposited thin, flat diamond 'flakes' on any surface.
Might not work on plastic lenses though because the
underlying substrate is STILL soft and subject to
macroscopic gouges by sand and such. Kinda like
putting tinfoil over jello - yea, the metal is a lot
harder than the jello but you can still scoop out a
chunk of the rasperry/lime right through the foil
using a spoon.
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Posted by Larry on January 9, 2006, 2:53 pm
Please log in for more thread options Hello B1ackwater,
Please check out PSR-1 at www.eutectos.com. and let me know what you
think.
As in most Sonars, there is a dead zone, which in this case (gain and
pulse width dependent) can be as low as 8 inches. Current
implementation provides 1" resolution, which could be reduced to
perhaps 1/4 inch. Hardware supports it, but firmware would need to be
changed. Can you tell me more about your requirement both technically,
application wise and what the potential volume may be? We might be able
to help, and would like too.
Regards,
Larry
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Posted by Mitch Berkson on January 9, 2006, 6:27 pm
Please log in for more thread options Larry wrote:
>
> Please check out PSR-1 at www.eutectos.com. and let me know what you
> think.
>
> As in most Sonars, there is a dead zone, which in this case (gain and
> pulse width dependent) can be as low as 8 inches. Current
> implementation provides 1" resolution, which could be reduced to
> perhaps 1/4 inch. Hardware supports it, but firmware would need to be
> changed. Can you tell me more about your requirement both technically,
> application wise and what the potential volume may be? We might be
> able to help, and would like too.
From the title and his original post, isn't it clear that he wants a
WEATHERPROOF sensor? Yours isn't and neither are other offerings in the
<$100 price range. I think there would be many people thrilled to know
about a WEATHERPROOF distance sensor for less than $100. For starters, this
would mean that it would work when wet.
Also, the Devantech or the new (see other thread) MaxSonar-EZ1 are about
half the price of the PSR-1. Is there an advantage of yours over those
offerings?
Mitch
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Posted by Larry on January 10, 2006, 2:26 am
Please log in for more thread options Providing a waterproof sensor is no problem accept packaging increases
cost, size and flexibility. Putting the sensor in a plastic or metal
box that fits your specific platform is the best bet. Put a couple of
o-rings around the transducer and mount the sensor through a close
fitting hole in the box. Then ...
Have you tried putting a latex finger-cott over the sensor head? The
thin membrane will be acoustically transparent. One way I've used to
protect the transducers is as follows:
1) partially inflate a balloon. 2) apply a thin film of super-glue,
silicone RTV or epoxy around the side of the transducer. 3) press the
balloon against the face of the transducer so that the balloon deforms
over the sides of the transducer. 4) hold until adhesive cures. 5) cut
away excess balloon material.
Stay dry,
Larry
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> First, does anyone know what that plastic is that they make
> those condensation-resistant bathroom mirrors out of ? If
> I put the Sharp sensors behind a thin sheet of that ... no
> more condensation problems. (power-consumption IS an issue
> here so heated optical windows are out of the question)