1.1 - Calibration of Infrared Cameras with Microbolometers
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings IRS² 2015
- I1 - Calibration and Accuracy
- H. Budzier, G. Gerlach - Technische Universität Dresden (Germany)
- 889 - 894
A description will be given of the calibration process for accurate measurement of temperature in uncooled infrared cameras on the basis of microbolometer arrays. Calibration is used to calculate a temperature-proportional output signal (IR image) from the measurement signal (raw image) taking into account all technical and physical properties of the IR camera. The individual steps of the calibration are shown by way of example. After commissioning of the IR camera first all defective pixels are detected. Then the balance of the pixel characteristic curves (correction of the nonuniformity) is carried out using two-point correction. In microbolometers that are not temperaturestabilized, the dependence of the sensor parameters of the temperature sensor must also be considered. Ambient temperature changes are compensated for by shutter correction. The final stage involves radiometric calibration, which establishes the relationship between pixel voltage and target object temperature.