Because the glass envelope is opaqe to IR, you will only
read the envelope temperature and NOT the target inside.

For proof of this, just look at a near IR image of a house. The
windows always show up as dark even though the inside air and
objects are much hotter. Same thing for a human face with eyeglasses.
Eyeballs don't register because the glass lenses block the IR from the
eyes.

robertf wrote:
>
> I wonder how they correct for
> emmisivity(sp)? Has anyone
> tried doing an accuracy test
> for something like a Kanthal
> furnace?
> What's the max temp on this? I
> have a need to read a target
> that is inside a (glass)clear
> envelope ( also hot) will it
> read the envelope or the
> target?
>
> tia-rf
>
> ----- Original Message -----
> From: M. Adam Davis
> <adavis@UBASICS.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, January 03,
> 2001 12:10 PM
> Subject: Re: [OT]: handy
> gadget
>
> > Apparently it's good for
> Christmas gifts... ;-)
> >
> > I can see myself using it to
> check the temperature on a
> thermister to help
> > calibrate it, rather than
> securing the thermister and
> another sensor to a
> > block of metal and waiting
> for both their temperatures to
> stabilize...
> >
> > -Adam
> >
> > Roman Black wrote:
> > >
> > > Yes. Wondering if many
> people use them, and
> > > maybe hoping for some tips
> re what it's good
> > > for. :o)
> > > -Roman
> > >
> > > Eisermann, Phil [Ridg/CO]
> wrote:
> > > >
> > > > We've got one of those
> in our test lab. We use it to
> measure heat rise on
> > > > threaded steel pipe (its
> difficult to get a
> thermocouple in there). Are
> you
> > > > asking out of curiosity?
> > > >
> > > > -----Original
> Message-----
> > >
> > > > Hi, anyone here got a
> non-contact infrared
> > > > (emissive) thermomter? I
> got one for xmas and
> > > > it's great. You can
> point it at any chip,
> > > > heatsink, power resistor
> etc and it tells you
> > > > in less than a second
> how hot it is.
> > > >
> > > > Not super-accurate, but
> it's within a degree
> > > > at most of the temps I
> measure. Great for
> > > > checking temp rise in
> the motors and drivers
> > > > I'm working on.
> > > > :o)
> > >
> > > --
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