Jacob, Karl; Schroder, Arne; von Werra, Leandro; Reinhard, Florian; Raisin, Philippe; Murk, Axel (2019). Radiometric Characterization of a Water-Based Conical Blackbody Calibration Target for Millimeter-Wave Remote Sensing. IEEE journal of selected topics in applied earth observations and remote sensing, 12(6), pp. 1688-1696. IEEE 10.1109/JSTARS.2019.2913729
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In this paper, we present the design and radiometriccharacterization of a water-based conical blackbody calibrationtarget to be applied as a precise reference source in laboratoriesand for the accurate calibration of ground-based microwave in-struments. The concept of aqueous blackbody targets circumventsthe conflict between the electromagnetic and thermal propertiesof traditional calibration target designs. The temperature control-lable target consists of a conical low loss plastic shell, which hasbeen manufactured using a stereolithography three-dimensionalprinter to define the water–air interface. An advanced exponentialprofile of the shell is used to compensate the comparatively high re-fractive index of water and to obtain a high emissivity. Simulationsand active measurements of the coherent backscattering S11havebeen performed verifying its excellent electromagnetic properties.Furthermore, radiometric measurements at 110 GHz demonstratethe outstanding thermal performance at various target tempera-tures between 10 and 60 °C. The differences between the bright-ness temperature and the water temperature are measured to beless than 40 mK and therefore significantly smaller in comparisonto traditional calibration targets. In addition, the measured base-line ripples in the spectra caused by the water-based calibrationtarget are small compared to established blackbody concepts.Index Terms—Blackbody targets, calibration, electromagneticdesign, microwave absorbers, microwave radiometry, remotesensing, three-dimensional (3-D) printing.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Applied Physics 08 Faculty of Science > Institute of Applied Physics > Microwaves |
UniBE Contributor: |
Jacob, Karl Friedrich, Murk, Axel |
Subjects: |
600 Technology > 620 Engineering |
ISSN: |
1939-1404 |
Publisher: |
IEEE |
Language: |
English |
Submitter: |
Simone Corry |
Date Deposited: |
29 Aug 2019 15:39 |
Last Modified: |
05 Dec 2022 15:30 |
Publisher DOI: |
10.1109/JSTARS.2019.2913729 |
BORIS DOI: |
10.7892/boris.132676 |
URI: |
https://boris.unibe.ch/id/eprint/132676 |
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