Fluke Cv400 Clirvu Application Note Thermal Imaging FOV Explained

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Fluke IR Window eld of view

75 mm (3 in)

window

73.66 cm (29 in)

22.1 cm

(8.7 in)

3 inch IR Window FOV with Standard Lens

30.48 cm

(12 in)

50 mm (2 in)

window

38.1 cm (15 in)

19.76 cm

(7.78 in)

3 inch IR Window FOV with Standard Lens

30.48 cm

(12 in)

100 mm (4 in)

window

96.52 cm (38 in)

24.2 cm

(9.53 in)

4 inch IR Window FOV with Standard Lens

30.48 cm

(12 in)

These Field of View (FOV) calculations are based on best practices used during infrared inspections and serve as a guide when

choosing IR Window sizes and locations.

Please note that the illustrations represent achievable FOV at a distance of 30.48 cm (12 in) to target. Additional FOV

calculations at various distances to target are given in the tables below. Actual FOV can vary based upon equipment layout

(phase barriers, internal compartments, etc.). Be sure to verify IR Window position before drilling holes for installation.

For illustration purposes, only horizontal FOV is shown. Adjusting the position of the thermal imager allows the overall

FOV to be achieved in all directions—360 degrees.

All calculations based on Fluke Ti32 Thermal Imager with standard lens (23° x 17°).

IR window

size Distance to target

15.24 cm

(6 in)

30.48 cm

(12 in)

45.72 cm

(18 in)

60.96 cm

(24 in)

100 mm (4 inch) 53.34 cm

(21 in)

96.52 cm

(38 in)

139.7 cm

(55 in)

182.88 cm

(72 in)

75 mm (3 inch) 40.64 cm

(16 in)

73.66 cm

(29 in)

109.22 cm

(43 in)

142.24 cm

(56 in)

50 mm (2 inch) 20.32 cm

(8 in)

38.1 cm

(15 in)

53.34 cm

(21 in)

68.58 cm

(27 in)

©2011 Fluke Corporation. Specifications subject to change without notice. Printed in U.S.A. 9/2011 4080700A F-EN-N

Modification of this document is not permitted without written permission from Fluke Corporation.

A maximum attainable FOV (roughly 6xD) can be achieved by positioning

a thermal imager at extreme angles. These angles require that the view

through the thermal imager include seeing both through the IR Window

(inside the enclosure) and beyond the IR Window (outside the enclosure).

Such positioning does not expose the entire surface of the camera lens to

the target being measured and when combined with the steep viewing

angle, slightly less accurate results should be expected.

Wide-angle lenses

Compared to a standard lens (23° x 17°) a wide-angle lens (46° x 34°)

offers a larger FOV when positioned perpendicular to the IR Window, as

shown. However, the size of the wide-angle lens itself limits the ability

to position the thermal imager at much of an angle. This means that the

achievable FOV with a wide-angle lens, obtained by angling the ther-

mal imager, is actually less than that of the standard lens. This can vary

based on camera model.

Calculations based on Fluke Ti32 with wide-angle lens (46° x 34°)

75 mm (3 in)

window

63.75 cm (25.1 in)

40.89 cm

(16.1 in)

3 inch IR Window FOV with wide angle Lens

30.48 cm

(12 in)

75 mm (3 in) wide-angle lenses

Distance to target 30.48 cm (12 in)

FOV 63.75 cm (25.1 in)

For more information on Fluke IR Windows,

call 1-800-760-4523 or visit www.fluke.com/irwindows

Extreme angles