FLIR
LEPTON® Engineering Datasheet
The information contained herein does not contain technology as defined by the EAR, 15 CFR 772, is publicly available,
and therefore, not subject to EAR. NSR (6/14/2018).
Information on this page is subject to change without notice.
Lepton Engineering Datasheet, Document Number: 500-0659-00-09 Rev: 203
33
The radiometric accuracy of the Lepton camera module depends primarily on the ambient and scene
temperature. The size, distance, and emissivity of the target are also factors. Extreme humidity, high
concentrations of certain gases such as CO
2
, and nearby extremely hot or cold objects may also affect
measurements and should be avoided during module tests.
When measured against a 1” blackbody at 25cm,
corrected for target emissivity, and at thermal equilibrium under typical room conditions, the typical accuracy of
the Lepton module in high gain mode is per
Table 4- Radiometric Accuracy over Conditions, High Gain
T Ambient
0°C
30°C 60°C
T Scene
10°C
±7°C ±7°C ±8°C
50°C
±6°C ±5°C ±5°C
100°C ±6°C ±5°C ±4°C
When the Lepton module is integrated into a system, there are additional error sources that must be considered.
Heat from nearby components such as electronic devices, motors and solenoids, and even heat from an
operator’s hand, may directly or indirectly increase the radiation falling on the sensor. Variable heat so
urces
should be avoided. It is important that the heat presented to the Lepton module from surrounding electronics
and other sources be consistent and symmetric about the Lepton module to make compensation effective. The
correction parameters are scalar values and cannot accommodate dynamic or gradient effects. In addition, when
a protective window is required, reductions of the amount of scene radiation from the window as well as direct
emissions and reflections from it, will alter the received radiation. The Lepton module provides methods to
correct for these effects.
When the Lepton camera module is used in a device with a protective window and surrounding heat sources, the
radiometric temperature reading can be improved by performing a gain and offset correction for best accuracy.
The gain and offset values are input as window transmission and window temperature parameters though the CCI
interface. After performing a recalibration at room temperature against two reference blackbodies and
programming these two parameters, the typical accuracy in high gain mode can be according to
