Oh, I understand. The original question
was what Cyberguys level gadgets could
do in terms of seeing bad wiring inside a
wall.
If cost is no object, one can of course
do more. A lot more.
Devices operating in the 1THz range
can see people inside their house.
Through walls. There were discussions
about the legal implications of all this
several years ago.
-- Bob
On Thu, Jan 28, 2010 at 9:04 PM, Michael Mol <mikemol at gmail.com> wrote:
> On 1/28/2010 8:48 PM, Bob Kline wrote:
> > How cool was the room?
>
> Thermostat is normally 72F, but that's in another room. I'm in the room
> with the servers, which is usually about five higher.
>
> >
> > You seen to have a short sleve
> > shirt on, but I think I can see the
> > back of a chair, walls in the the
> > background. Is it a big room?
>
> I wear short-sleeves year-round, primarily because of the higher
> temperatures in the vicinity of my workstation. That was actually taken
> in Dec of 2007, I think. (The date is off on Flickr, but that's because
> the source is a BMP, and the timestamp was screwed up due to a few
> workstation migrations.)
>
> Room is about 750 ft^2, or about 6000ft^3.
>
> >
> > Jet gets to the fact that because
> > you stand out some the room might
> > be large, and-or cool
>
> I don't think you understand how far-IR temperature monitoring works.
> If you'd like, I can delve into a discussion of microbolometers and
> measurement adjustments stemming from surface emissivity, ambient
> temperature and ambient humidity values.
>
> There's more at work than just the wavelength of quanta, there's also
> intensity of emissions, considerations of atmospheric absorption and
> considerations of ambient temperatures reflecting off of other surfaces.
>
> What it boils down to is that in practical conditions, I can (and do,
> for use cases such as those that that software was written for) measure
> surface temperatures to within 0.01C.
>
> Don't forget I also control the palettization -- the conversion of raw
> temperature numbers to RGB pixels, which goes towards making differences
> "stand out."
>
> >
> > -- Bob
> >
> >
> > On Thu, Jan 28, 2010 at 8:18 PM, Michael Mol <mikemol at gmail.com
> > <mailto:mikemol at gmail.com>> wrote:
> >
> > On Thu, Jan 28, 2010 at 8:02 PM, Bob Kline <bob.kline at gmail.com
> > <mailto:bob.kline at gmail.com>> wrote:
> > > On Thu, Jan 28, 2010 at 6:03 PM, Michael Mol <mikemol at gmail.com
> > <mailto:mikemol at gmail.com>> wrote:
> > >>
> > >>
> > >> The chief problem with "darkvision" as it applies to passive
> > near-IR is
> > >> that there is a lot of ambient near-IR radiation that's not
> > related to
> > >> warm bodies.
> > >>
> > >> In short, your warm body radiation in the near-IR will be there,
> but
> > >> largely drowned out by the ambient near-IR radiation.**
> > >
> > > The peak wavelength for a human body
> > > thermal spectrum is 10 microns - in the so
> > > called long-wave infrared range. You shine
> > > if you're standing out in the snow, but the
> > > human body is not really very hot. About
> > > the same as your house interior, which is
> > > that temperature, by design. So you don't
> > > stand out much.
> > > See http://en.wikipedia.org/wiki/Infrared
> > > -- Bob
> >
> >
> http://www.flickr.com/photos/28208534@N07/3681419505/in/set-72157620862996406/
> >
> > I don't?
> >
> > What kind of image is this? i.e., how
> > is it corrected?
> >
> >
> >
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