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'IR Thermometer plans or sensors'
1999\03\31@003536 by Jon Petty

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Hi everyone

I have been trying to get info on IR temperature sensors. I have received
great explanations of the technology, but I am trying to find out how to build
my own.

Someone thought they saw plans in a magazine for building a IR thermometer,
has anybody seen the ad or know where I can get an explanation of the parts
required and some sample diagrams for building one?

Any help appreciated.

I found some remote IR temp sensors for industrial application with a 4-20ma
output, but they are $140. Thats way to much. I am looking to spend about $10
for production (if the project makes it) and more of course for prototyping.

Thanks again

JOn

1999\03\31@021340 by Gerhard Fiedler

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At 00:20 03/31/99 -0500, Jon Petty wrote:
>I have been trying to get info on IR temperature sensors. I have received
>great explanations of the technology, but I am trying to find out how to build
>my own.

since you want to measure the temp of a spot, you need some kind of optics.
that's not infinitely complicated or expensive, but you've got to be
remotely familiar with the laws of simple refraction and it is some
mechanical work.

then you find either a thermopile (for slow measurements) and use a
standard thermocouple measurement setup (opamp to amplify the voltage and
some means to correct for the cold junction temp).

or find a photodiode (for faster measurements, with an appreciable
sensitivity in the range between 2 and 10um -- the longer the wavelengths
in the range, the better) and use it with a simple opamp circuit to start
with (anode to ground, cathode to inv input, resistor between inv input and
output, noninv input to ground). this opamp output goes into an adc input.

that's the very basic, and it will yield some measurable results. the
precision is another question, though...

ge

1999\03\31@134857 by Reginald Neale

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Jon said:

>I found some remote IR temp sensors for industrial application with a 4-20ma
>output, but they are $140. Thats way to much. I am looking to spend about $10
>for production (if the project makes it) and more of course for prototyping.
>

Jon:

For those who do have more to spend, $99 USD will buy you an entire
self-contained non-contact IR thermometer with digital readout from
Cole-Parmer. For $149 USD it comes with a built-in laser aimer. Part
#KD-39640-10. I haven't used one but it looks neat.

Reg Neale

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