D1.3 - A gonioreflectometer for the measurement of bidirectional reflectance distribution functions in the thermal infrared
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Lectures
- Chapter
- D1 - IR Sensing
- Author(s)
- H. Noori, K. Ma, R. Schmoll, A. Kroll - University of Kassel, Kassel (Germany)
- Pages
- 183 - 184
- DOI
- 10.5162/SMSI2025/D1.3
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
An in-plane-gonioreflectometer was developed to measure bidirectional reflection distribution functions (BRDF) for opaque surface materials. The emissivity can be determined by integrating the BRDF over the hemisphere for surfaces with diffuse scattering properties. A gonioreflectometer generally consists of a radiation source, a detector and some robotics to vary radiation and viewing angles. An integrating sphere operating in a broadband infrared wavelength was selected as radiation source. An LWIR and an MWIR thermal imaging camera were selected as detectors. The gonioreflectometer and the results of the first measurements are presented here.