ThermoView
®
TV40 Series
Users Manual, Rev. 1.1, Apr 2019
18
2.2 Optical Specifications
The following optical specification is based on the theoretical calculated spot size derived on the pitch of the camera
detector array and the lens focal length. Typically, for accurate temperature measurements, the target area needs
to be larger than that determined by the calculated theoretical spot sizes, which corresponds to 3 x 3 pixels.
For more technical information on the add-on lenses, see section 7.1
2.2.1 Standard Lens
Field of View (FOV)
34° x 25.5° (horizontal x vertical)
Instantaneous Field of View (IFOV)
1.9 mrad (1 pixel)
Measurement Field of View (MFOV)
5.6 mrad (3 x 3 pixel)
Focus Range (infrared)
152 m
m to ∞ (0.5 ft to ∞)
Focus, fixed (visible)
600 mm (1.96 ft)
Table 2-1: Spot Sizes for Standard Lens
Measuring distance
Thermal image (H x V)
Minimum detectable spot size
(1 pixel)
Minimum measurement area
(3 x 3 pixel)
0.3 m (1 ft)
0.183 x 0.136 m (0.6 x 0.5 ft)
0.6 mm (1.9 mil)
1.7 mm (1.9 mil)
0.5 m (1.6 ft)
0.306 x 0.226 m (1 x 0.7 ft)
0.9 mm (3 mil)
2.8 mm (8.9 mil)
1.0 m (3.3 ft)
0.611 x 0.453 m (2 x 1.5 ft)
1.9 mm (6.1 mil)
5.6 mm (18.4 mil)
5.0 m (16 ft)
3.06 x 2.26 m (9.8 x 7.2 ft)
9.3 mm (29.7 mil)
27.8 mm (89 mil)
10 m (33 ft)
6.11 x 4.53 m (20.2 x 14.9 ft)
18.5 mm (61.2 mil)
55.6 mm (183.6 mil)
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