5. Techniques of Infrared
rmometer
The
9
5.1 Field of View (FOV) ratio
= Distance to Diameter (DS) ratio
The field of view is the angle of vision at which the
instrument operates , and is determined by the optics
of the unit. The FOV is the ratio of the distance from the
target to the target diameter. The smaller the target , the
i
m e
closer you should be to it . When the target dia et r s
small, it is important to bring the thermome ter closer to the
t
targe to insur t hat on y the target i s measured,e xcluding
l
e
the surroundings.
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