20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Specification and Performance Studies in Near UV of HSRL Receivers for Atmospheric Monitoring in Ultra High Energy Cosmic Ray Observatories

Not scheduled
Dauphine (Alpes Congrès - Alpexpo)

Dauphine

Alpes Congrès - Alpexpo

Poster Astroparticle Physics

Speaker

Mrs Angelika Georgakopoulou (NTUA)

Description

A High Spectral Resolution Lidar (HSRL) design study, which will lead to a prototype, is being developed for atmospheric monitoring in Ultra High Energy Cosmic Ray Observatories aiming to improve the accuracy of the measurement of the differential scattering coefficients of the aerosol and clouds in near UV region. The specification studies of the candidate Fabry-Perot receivers for the aerosol and molecular channel compatible with a pulsed SLM Nd:YAG laser at 355 nm are presented in this work. The etalon plates have to meet the required performances, by means of parallelism and RMS flatness finesse over their reflective surfaces. Applying our recently developed method, we present the experimental measurements obtained for the aerosol channel in recording fringe patterns by using multi or single isotopic light sources in near UV region. The results can lead us to conclusions concerning the achievement of the required finesse. From preliminary results obtained in prototype etalon plates which have been already coated, by means of the divergence in their parallelism, will lead us to estimate the distortion on both substrates caused by the stresses developed by the deposited thin film layers. Finally, a feasibility study to use the Fizeau type interferometer as an alternative-more accurate performance study method is also described.

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