FLIR i3 User Manual

some of it arrives at the other surface, through which most of it escapes; part of it is
reflected back again. Although the progressive reflections become weaker and
weaker they must all be added up when the total emittance of the plate is sought.
When the resulting geometrical series is summed, the effective emissivity of a semi-
transparent plate is obtained as:
When the plate becomes opaque this formula is reduced to the single formula:
This last relation is a particularly convenient one, because it is often easier to measure
reflectance than to measure emissivity directly.
142 Publ. No. T559580 Rev. a486 – ENGLISH (EN) – November 17, 2010
22 – Theory of thermography

FLIR i3 Specifications

General

Infrared Resolution	60 x 60 pixels
Thermal Sensitivity	< 0.15°C
Temperature Range	-20°C to +250°C
Field of View	12.5° x 12.5°
Focus	Fixed
Battery Life	5 hours
Operating Temperature	-10°C to +50°C
Storage Temperature	-40°C to +70°C
Display	2.8 in color LCD
Weight	0.34 kg