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24 January 2019 Initial progress toward planar integrate, low-cost water vapour radiometers
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Proceedings Volume 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems; 110430T (2019) https://doi.org/10.1117/12.2501944
Event: Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 2018, Skukuza, South Africa
Abstract
Astronomical, astrometric and geodetic observations by mm-Wave Very Long Baseline Interferometry (VLBI) are adversely affected by precipitable water vapour (PWV) in the troposphere. Current water vapour radiometers (WVRs), such as that deployed at the Large Millimeter Telescope (LMT) site, are difficult to install and maintain, and are prohibitively expensive for surveying promising new sites for telescopes or for wide-spread deployment for a priori calibration. We report here on initial progress towards a Planar Integrated Low-Cost H2O Atmospheric Radiometric Detector (PILCHARD), which aims to reduce the cost of 22 GHz WVRs for site surveys, whilst eliminating the need for moving antennas. It is found that the required tip curve can be generated by a static antenna using multiple pencil beams from a multi-feed, non-traditional offset reflector, while the necessary system receiver temperature is easily achievable using planar integrated off-the-shelf components alone.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tinus Stander, William Cerfonteyn, Roger Deane, Dirk de Villiers, Khadija El Bouchefry, Daniel Ferrusca, Stan Kurtz, Gordon MacLeod, and Shaunel Walker "Initial progress toward planar integrate, low-cost water vapour radiometers", Proc. SPIE 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 110430T (24 January 2019); https://doi.org/10.1117/12.2501944
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