Preprints
https://doi.org/10.5194/amt-2021-30
https://doi.org/10.5194/amt-2021-30

  15 Feb 2021

15 Feb 2021

Review status: this preprint is currently under review for the journal AMT.

Polarization lidar for detecting dust orientation: System design and calibration

Alexandra Tsekeri1, Vassilis Amiridis1, Alexandros Louridas2, George Georgoussis2, Volker Freudenthaler3, Spiros Metallinos1, George Doxastakis2, Josef Gasteiger4, Nikolaos Siomos1, Peristera Paschou1, Thanasis Georgiou1, George Tsaknakis2, Christos Evangelatos2, and Ioannis Binietoglou5 Alexandra Tsekeri et al.
  • 1Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece
  • 2Raymetrics S.A., Athens, Greece
  • 3Fakultät für Physik, Meteorologisches Institut, Ludwig-Maximilians-Universität, Munich, Germany
  • 4University of Vienna, Faculty of Physics, Vienna, Austria
  • 5National Institute of R&D for Optoelectronics, Magurele, Romania

Abstract. Dust orientation is an ongoing investigation in recent years. Its potential proof will be a paradigm shift for dust remote sensing, invalidating the currently used simplifications of randomly-oriented particles. Vertically-resolved measurements of dust orientation can be acquired with a polarization lidar designed to target the off-diagonal elements of the backscatter matrix which are non-zero only when the particles are oriented. Building on previous studies, we constructed a lidar system emitting linearly- and elliptically-polarized light at 1064 nm and detecting the linear and circular polarization of the backscattered light. Its measurements provide direct flags of dust orientation, as well as more detailed information of the particle microphysics. The system also employs the capability to acquire measurements at varying viewing angles. Moreover, in order to achieve good signal-to-noise-ratio in short measurement times the system is equipped with two laser sources emitting in interleaved fashion, and two telescopes for detecting the backscattered light from both lasers. Herein we provide a description of the optical and mechanical parts of this new lidar system, the scientific and technical objectives of its design, and the calibration methodologies tailored for the measurements of oriented dust particles. We also provide the first measurements of the system.

Alexandra Tsekeri et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Needs more data', Anonymous Referee #1, 02 Mar 2021
  • RC2: 'Promising instrument, deserves a better presentation', Anonymous Referee #2, 08 Mar 2021

Alexandra Tsekeri et al.

Alexandra Tsekeri et al.

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Short summary
Dust orientation in the Earth's atmosphere is an ongoing investigation in recent years, and its potential proof will be a paradigm shift for dust remote sensing. We have designed and developed a polarization lidar that provides direct measurements of dust orientation, as well as more detailed information of the particle microphysics. We provide a description of its design as well as its first measurements.