2.4 - Precise IR-Based Temperature Measuring- a Case Study for the Automatic Health Monitoring of Dairy Cows
- SENSOR+TEST Conferences 2011
2011-06-07 - 2011-06-09
- Proceedings IRS² 2011
- I2 - IR Arrays & lmaging
- W. Wirthgen, S. Zisper - Fraunhofer Institute (IVI), Dresden (Germany), S. Geidel, U. Franze - Hochschule für Technik und Wirtschaft, Dresden (Germany)
- 51 - 56
The modern livestock farming requires novel systems for an automatic health monitoring of animals like dairy cows. Infrared thermography (IRT) has been suggested for veterinary diagnostic, but due to the lack of a reliable precise temperature measurement under operating farming conditions and personal expense analysis the veterinary IRT diagnostic is rarely used in practice.
Starting from the requirements of a maximal temperature measurement uncertainty of ± 0.3 K (DIN12470-5, medical infrared thermometers) the IRT measurement uncertainty is calculated according to the modeling procedure given by the DIN1319 for different measurement configurations (referenced/ unreferenced, different object emissivity, etc.). A combination of a radiant temperature correction (with reference bodies and environment conditions measurement), an additional model based correction of influence factors as well as an automatic segmentation of the temperature corrected images as a basis of a proper calculation of “diagnostic” temperature values (temperatures of selected anatomic objects of the animal) are suggested and applied successfully for the analysis of more than 500 dairy cows.