Accuracy
Higher
resolution infrared cameras are quite compelling, producing
sharp images with excellent detail. Even more important,
however, is the dramatic improvement in overall accuracy
in certain situations. This
is because higher resolution normally results in smaller
IFOV (instantaneous field of view) and smaller measurement
spot size.
When comparing different infrared
cameras having the same field of view, the measurement spot
size decreases with increasing camera resolution. Consequently,
the highest resolution cameras have the smallest measurement
spot. |
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In
some circumstances, the degree of measurement inaccuracy due
to the use of lower resolution infrared cameras can be quite
large and could cause Thermographers to overlook potential problems.
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In order to achieve accurate temperature
measurement, the measurement spot size must be small enough so that
there are no significant temperature variations on the object. In
other words, the temperature of the object over the measurement
spot must be uniform.
The example to the right illustrates
the error that’s caused when different resolution infrared
cameras are used to measure the temperature of a small electrical
connection
at a distance with a cold sky as background. The
degree of inaccuracy is quite large and could cause the thermographer
to overlook potential problems.
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Calculate
Your Camera's Measurement Spot Size.
Our Spot
Size Calculator helps determine measurement spot size
for different
camera specifications and viewing situations.
Download
it FREE now! |
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As illustrated in the
thermal images above, it would be unwise to use a low resolution
camera for measuring the temperature of small objects at
a distance. For accurate measurements in such situations,
high resolution cameras produce the best accuracy and reduce
the likelihood of overlooking potential problems.
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