--- Vasile Surducan <piclist9@gmail.com> wrote:

> On 4/5/07, John Chung <kravnus@yahoo.com> wrote:
> > Can anyone recommend some IR modules? It should
> not
> > cost too much. USD 30.00 at max. Range of
> measurement
> > would be 10C to 300C.
> 
> " and must measure at a critical distance range of 1
> inch"
> 
> You didn't define which is the target surface,
> because if it's a 1x1mm
> iron piece,
> most of the commercial infrared modules will not be
> able to sense it
> even from 1 inch distance.
> 
> Let's think and talk  like engineers and not like
> accountants...
> I'll try to explain you why is improbable to find
> such device at $30.
> 
> 1. Because the measurement range is below and above
> the possible
> ambiant temperature, so definitely it needs an
> internal temperature
> reference (like a peltier) somewhere below the 10C,
> and this a
> critical moisturing point (around 8C).
> 2. Because at 1 inch distance and 300C, everything
> will be melted
> including the software you're writting
> 
> and so on...
> :)
> -- 
Thanks for the correction. I like to build an IR
thermometer for some projects. One of the possible
case scenario is to actually measure a small spot like
a soldering iron. The spot would be the tip of the
iron. I do have a IR thermometer which can read the
temperature of the tip after SOME adjustment. It is
getting annoying to say the least. So to measure the
tip I thought of a IR thermometer with a better
fixture and possible getting a better reading of the
tip. I do know of the thermal control solder iron but
currently I am messing with the idea of just
identifying the temperature of the tip. I have thought
of other possible solutions but it requires me to
actually heat up the element to get the current
temperature at the tip.... I could wind some coil to
the iron to gain the overall temperature of the
iron..... 300c at one inch for the tip should not harm
it since it pretty much localize. Yes I do know of the
diameter that the IR gun can measure at a given
range.......

I hope that my new explanation would help clarify my
needs. :)

John


 
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