Hi Vitaliy:

I measured part temperatures some decades ago by using a Barnes Engineering IR 
thermometer.  It came with a microscope and read the temperature at a point 
source.  But you only get correct readings if the emissivity of the object is 
100%, i.e, if it's black.  So shiny things like metal transistor packages need 
to be painted flat black or you need to know what emissivity number to dial 
into the Barnes instrument.

I think you can now buy a reasonably low cost thermopile type IR thermometer 
that has a narrow (maybe 10 deg) look angle (most of them are 1:1 angle types) 
that could be rigged up to do a similar thing.  Remember that the single pixel 
will report the integral temperature of what it's seeing so you want it seeing 
only the hot part and not  any background that's cooler.

There are also some line and small number of pixel (maybe 64) imaging chips 
commonly used for robots and it may be that the view angle for one of these 
pixels would be small enough to be useful.

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com

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