27
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Chapter 4 Maintenance and Service
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Q:
Why can't I measure the temperature of a
gas, vapor, or flame?
A:
Since gases, vapors, and flames are
transparent to infrared radiation, their
temperatures cannot be measured in this
way.
Q:
Why can't I measure temperature through
rain or fog?
A:
Since rain and fog reflect and absorb infrared
radiation, accurate measurement through
them is impossible.
Q:
Doesn't the measurement distance affect the
resulting measured value for temperature?
A:
Air hardly absorbs at all infrared radiation of
the wavelengths (8 to 16
μ
m) used by this
device for temperature measurement.
Therefore accurate temperature measurement
is possible, irrespective of the measurement
distance.
