Fabry-Pérot optical filter assembly: a candidate for the Mie/ Rayleigh separator in EarthCARE

Abstract

This paper describes the development, characterisation and environmental testing of a high performance state-of-the-art optical filter for separating the Mie and Rayleigh backscatter signals for the ATLID LIDAR of the EarthCARE mission. The filter assembly utilises capacitance stabilised Fabry-Pérot étalon technology to provide high resolution optical filtering of the LIDAR signal, efficiently separating the two critical backscatter components from the atmosphere. The paper describes the development of the filter assembly and its subsequent performance testing. The filter has demonstrated state-of-the-art optical performance. Additionally, one of the étalons has been taken through complete environmental testing for space applications.

Theoretical description of improving measurement accuracy for incoherence Mie Doppler wind lidar

“…The lidar has been proved to be an effective apparatus to fulfill this data measurement requirement for high accuracy and spatial resolution. [3][4][5][6] The Doppler wind lidar (DWL) systems fall into two categories according to operating modes: coherent (or heterodyne [7,8] ) detection system and direct detection (or incoherent [9][10][11] ) system. There are usually two leading kinds of incoherent DWL measurement mechanisms.…”

Fitting operate mode for incoherent Mie Doppler wind lidar

“…For the aerosols backscatter dependence of the coherent DWL systems, it is limited to the lower troposphere. For incoherent detection technique can be extended to the Raleigh backscatter from air molecules for the whole atmosphere wind observation [7][8][9], more advances and discussions have been concentrated on it over the past decade [10][11][12]. The main kind of incoherent DWL system is utilizing the double-edge technique based on the Fabry-Perot interferometer (FPI) [13][14][15][16].…”