Leeuw, G. de
Technisch Physische Dienst TNO - TH TNO Fysisch en Elektronisch Laboratorium
|Source:||Meynart, R.Neeck, S.P.Shimoda, H.Lurie, J.B.Aten, M.L., Sensors, Systems and Next-Generation Satellites VII, 8-10 September 2003, Barcelona, Spain, 86-95|
|Proceedings of SPIE|
Physics · Detection · Earth observation · Imaging spectrometer · Air quality · Algorithms · Atmospheric aerosols · Earth atmosphere · Health care · Information retrieval · Light polarization · Mathematical models · Optical sensors · Optimization · Spectrometers · Remote sensing
At present there is an increasing interest in remote sensing of aerosols from space because of the large impact of aerosols on climate, earth observation and health. TNO has performed a study aimed at improving aerosol characterisation using a space based instrument and state-of-the-art aerosol retrieval algorithms, based on requirements for up-to-date regional and global aerosol transport models. The study has resulted in instrument specifications and a concept design for aerosol detection from space. Based on the study the main requirements for a dedicated aerosol spectrometer are: a spectral range from 330-1000 nm with a spectral resolution from 2 nm (UV) to > 30 nm (NIR), observation in at least 3 polarisation directions (Stokes parameters) over a field of view (FOV) in swath direction of > 114 degrees and observation in at least 3 viewing directions (backwards, nadir, forward). The spectrometer design is a prism imaging spectrometer using a single detector array to measure the complete spectra for 2 polarisation directions. In this way the requirements for each viewing direction can be met with only 2 detector arrays. The system has a modular set-up, which makes the implementation of, for example, a change in the number of observation directions very simple. The basic requirements to discriminate between aerosol types are currently only met POLDER, that combines multiple view angles with polarisation. The DARE concept shows an attractive potential for the development of next generation aerosol sensors.