D3.1 - Rapid measurement of the Size-of-Source Effect by using an Iris aperture
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Lectures
- Chapter
- D3 - IR and Temperature Measurement
- Author(s)
- M. Mendez, R. Schmoll, A. Kroll - University of Kassel, Kassel (Germany)
- Pages
- 196 - 197
- DOI
- 10.5162/SMSI2025/D3.1
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
The source size effect (SSE) is a systematic error in thermography cameras, where the measured radiance temperature varies with object size. The SSE is measured by capturing deviations in the camera’s response across defined object sizes. These methods must ensure that the calculated differences are distinguishable from of measurement uncertainty and that any thermal effects unrelated to the measurement process are minimized. This often requires considerable effort, especially when the number of points to collect increases. This paper proposes an alternative method using an iris aperture for continuous SSE measurement, which yields results comparable to those of the conventional discrete method, while providing three times more data points and reducing measurement time by 98 %.