Creation of a Lambertian Microwave Surface for Retrieving the Downwelling Contribution in Ground-Based Radiometric Measurements
| Autor: | Bruno Courtemanche, Benoit Montpetit, Alain Royer, Alexandre Roy |
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| Rok vydání: | 2015 |
| Předmět: |
Radiometer
Materials science business.industry Geotechnical Engineering and Engineering Geology Physics::Geophysics Lambertian reflectance Ray tracing (physics) Optics Downwelling Computer Science::Computer Vision and Pattern Recognition Emissivity Radiative transfer Astrophysics::Earth and Planetary Astrophysics Bidirectional reflectance distribution function Electrical and Electronic Engineering business Microwave Remote sensing |
| Zdroj: | IEEE Geoscience and Remote Sensing Letters. 12:462-466 |
| ISSN: | 1558-0571 1545-598X |
| DOI: | 10.1109/lgrs.2014.2346138 |
| Popis: | Downwelling radiative fluxes from inhomogeneous environments are not easy to quantify from the total measured signal contribution. We propose the use of a Lambertian reflector to assess this issue. Using ray tracing to extrapolate the bidirectional reflectance distribution function of a surface with high reflectivity in the microwave spectrum, we characterized a surface that acts as a near-Lambertian reflector at 37 GHz. After implementing such a plate using molded aluminum and getting its emissivity, we validated its Lambertian reflectance properties based on microwave surface-based radiometer measurements. This analysis also gives guidelines on how to make a Lambertian surface for different wavelengths in the microwave spectrum. Field experiments show the usefulness of such a Lambertian plate to estimate the downwelling contribution in ground-based radiometric measurements. |
| Databáze: | OpenAIRE |
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