Separation of Rayleigh and aerosol scattering using pure rotational Raman scattering

• Autores: Dale Simonich, B. R. Clemesha
• Localización: Óptica pura y aplicada, ISSN-e 2171-8814, Vol. 41, Nº. 2 (JUN), 2008 (Ejemplar dedicado a: IV Workshop LIDAR measur. in Latinamerica), págs. 155-158
• Idioma: inglés
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• Resumen

  • In the absence of aerosol scattering, lidar measurements of the Rayleigh backscattering coefficient can be used to determine atmospheric density profiles. Such density profiles can then be transformed into temperature profiles via the assumption of hydrostatic equilibrium and the perfect gas law. In the presence of aerosols, however, simple elastic scattering measurements are unable to differentiate between the Rayleigh and aerosol components, making it impossible to determine temperature profiles. It is possible to overcome this problem by determining atmospheric density from the rotational Raman scattering from atmospheric nitrogen and oxygen, which is unaffected by the aerosol scattering. This paper describes a lidar receiver designed to implement this technique, making it possible to determine both the atmospheric temperature profile and the aerosol backscattering from a single lidar measurement.