Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics, and will give delegates an opportunity to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please join us at the conference and take advantage of this opportunity to learn and engage with your peers in industry and the academic community.
PO131: How repeatable are ground based lidar calibrations in accordance with the IEC 61400-50-2?
Richard Fruehmann, Engineer, DNV
Abstract
One of the challenges in calibrating a lidar according to the IEC standard (IEC 61400-50-2), is that the measurements take place in the field and the measurand (the wind speed) as well as other environmental conditions are not under our control. Accordingly, duration, measurement data base, and environmental conditions vary for each calibration, and these can impact the resulting uncertainties obtained. In 2024, DNV installed a reference lidar at their lidar calibration test site in Janneby for lidar-to-lidar calibrations in parallel with the standard lidar-to-mast calibrations. This has now collected an exceptionally long verification dataset with parallel lidar and met mast data. This paper investigates how the choice of calibration period (time-of-year, duration, database completion) impact the resulting uncertainties, to answer the question, "how repeatable is a lidar verification in the free field?" The scatter in the results of multiple evaluations of this single lidar unit are compared with the scatter in the results of different units tested over the course of the year. This shows to what level the uncertainties obtained using the IEC calibration method can be attributed to the individual unit, and how much may be ascribed to the method itself.
No recording available for this poster.
