Preface

Julian Gröbner, Guest editor and chairman of the NEWRAD scientific committee Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC) Dorfstrasse 33 7260 Davos Dorf, Switzerland The 14 th International Conference on New Developments and Applications in Optical Radiometry (NEWRAD 2021) was organised by the National Institute for Standards and Technology (NIST), Boulder, United States and held online from 21 to 24 June 2021. Due to the COVID pandemic the original venue at Boulder in June 2020 had to be postponed and changed to a virtual event with a novel schedule consisting of pre-recorded talks and live sessions with the presenters to interact with conference attendees. The event was very well attended, notwithstanding the global participation with corresponding challenging time zones of the participants. A total of 274 registrations were received, with typically more than 100 attendees joining the online sessions. The NEWRAD scientific Committee would like to thank John Lehman and the whole local organising team for organising and holding this excellent event in the frame of these challenging conditions. 142 presentations were submitted, of which 48 were selected for oral talks, while the remaining submissions were presented as posters. Julian Gröbner, Guest editor and chairman of the NEWRAD scientific committee this title available in this pdf.