From: Alfio Puglisi (puglisi@arcetri.astro.it)
Date: Fri Sep 03 2004 - 12:52:47 MDT
On Fri, 3 Sep 2004, Mike wrote:
>http://projects.star.t.u-tokyo.ac.jp:/projects/MEDIA/xv/oc.html
>
>http://projects.star.t.u-tokyo.ac.jp:/projects/MEDIA/xv/images/oc-okugai
>3.mpg
>
>
>It's been done with clothing in Japan.
If I understand correctly, this is a much simpler: it's a photograph pf
the background project on a reflective piece of clothing. Really cool to
see, but useless for invisibility.
Alfio
>
>> -----Original Message-----
>> From: owner-sl4@sl4.org [mailto:owner-sl4@sl4.org] On Behalf
>> Of Eugen Leitl
>> Sent: Friday, September 03, 2004 5:44 AM
>> To: sl4@sl4.org
>> Subject: Re: Book Review "Nano" No spoilers
>>
>>
>> On Fri, Sep 03, 2004 at 03:58:06AM -0700, Thomas Buckner wrote:
>> >
>> > --- Keith Henson <hkhenson@rogers.com> wrote:
>> >
>> >
>> > > In another place Marlow describes an invisible
>> > > aircraft, one that has light
>> > > emitters on it that make the surface of the
>> > > aircraft look like the
>> > > background and the story line makes use of the
>> > > invisible properties of the
>> > > aircraft. It is reasonable to assume that we
>> > > could eventually have
>> > > aircraft surfaces that can display the view
>> > > blocked by the aircraft. But
>> > > if you think about it, to do this you have to
>> > > know exactly what direction
>> > > you want to fool someone. Otherwise, you don't
>> > > know what background to
>> > > present. This is applying pre high school
>> > > geometry and a bit of logic.
>>
>> You have to fake the wavefront in the VIS wavelenght range,
>> which asks for phased array optics and
>> sensors, and a computer to drive them.
>>
>> All of this is not very difficult with bulk nanoelectronics.
>>
>> This will work in VIS, but it will be impossible to
>> sustainably prevent a huge emission in far IR.
>>
>> Can you dissipate the power anisotropically, anyone knows?
>>
>> > This has been done, primitively. Some WW2
>> > antisubmarine aircraft had rows of light bulbs on
>> > the leading edge of the wings which caused the
>> > aircraft to blend into the background light of
>> > the sky until it was too close for the sub to
>> > dive. It did work.
>>
>> --
>> Eugen* Leitl leitl
>> ______________________________________________________________
>> ICBM: 48.07078, 11.61144 http://www.leitl.org
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>>
>
>
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