Datasheet

-56-
IFOV (Instantaneous Field of View) is the smallest detail within the FOV that can be
detected or seen at a set distance, the unit is rad. The formula is this:
IFOV = (Pixel Size) / (Lens focal length);
D:S
theoretical
(= 1/ IFOV
theoretical
) is the calculated spot size based on the pixel size of the
Thermal Imager detector array and lens focal length.
Horizontal FOV is 21°, Vertical FOV is 21°, the IFOV is 34um/7.5mm = 4.53mrad;
D:S
theoretical
(= 1/ IFOV
theoretical
) = 220:1
D:S
measure
(= 1/ IFOV
measure
) is the spot size needed to provide an accurate temperature
measure. Typically, D:S
measure
is 2 to 3 times smaller than D:S
theoretical
, which means the
temperature measurement area of the target need to be 2 to 3 times larger than that
determined by the calculated theoretical D:S.