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Chapter 4 Maintenance and Service
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4.2 Questions and Answers about
Measurement
Q:
Why can't I measure the temperature on the
other side of a glass pane?
A:
Normal glass absorbs infrared radiation of the
wavelength (8 to 16
μ
m) which this device
uses for temperature measurement.
Therefore this device cannot measure the
temperature of an object on the other side of
a glass sheet, but instead measures the
temperature of the glass sheet itself.
Q:
Light is shining on an object. Why can't I
measure its temperature accurately?
A:
Since fluorescent light includes almost no
infrared radiation, it has almost no effect
upon normal temperature measurement.
However sunlight and incandescent lights
emit radiation which includes substantial
amounts of the infrared radiation used by this
device for temperature measurement, and
accordingly may produce significant
measurement discrepancies.
