[Amps] IR thermometer results

[Larry Benko]

  I just did the test several people had hypothesized about in the past 
few days and the test was done with 2 different IR thermometers.

1.)  Thermometer was aimed at a black anodized aluminum heat sink at 18 
deg. C

2.)  A 1/2 diameter 100 deg. C air stream was directed across the air 
gap between the thermometer and the heat sink about 1-2" in front of the 
thermometer.  The air stream did not heat the heat sink or the 
thermometer directly.

3.) The temperature measured by the thermometer rose about 1-2 deg. C.

One thermometer was a close focus thermometer with the distance from the 
thermometer to the heat sink of about 1.5" and the other was a more 
standard IR thermometer with the distance of about 12".  This test shows 
that the actual air temperature between the thermometer and the object 
being measured has very little effect.

73,
Larry, W0QE