التفاصيل البيبلوغرافية
| العنوان: |
Laboratory polarization nephelometer for measurements of optical properties of aerosols. |
| المؤلفون: |
D Daugeron, B Renard, P Personne, G Brun, M Andr |
| المصدر: |
Measurement Science & Technology; Mar2007, Vol. 18 Issue 3, p632-638, 7p |
| مصطلحات موضوعية: |
SCIENTIFIC apparatus & instruments, AEROSOLS, OPTICS, POLARIZATION (Nuclear physics) |
| مستخلص: |
Polarization measurements are a powerful tool for better documentation of a variety of liquid and solid particles found in the Earth's atmosphere. Because the solid particles have a non-symmetrical shape, which thereby prevents modelling calculations, it is necessary to build a database of the scattering properties of irregular solid particles in order to interpret the results of remote sensing measurements from aircraft, balloon and satellite. A new laboratory polarization nephelometer was built for this purpose. The particles are levitated by continuous airflow, and are illuminated by a laser at a wavelength of 802 nm. Two avalanche photodiode sensors are used for recording the components of the scattered light perpendicular and parallel to the scattering plane. Detector amplifiers allow light-power detection from a few microwatts down to a few picowatts. Measurements with liquid droplets, made for scattering angles in the 20°-160° range, are in agreement with theoretical calculations, showing that the instrument works well. The first results obtained for irregular solid particles are also presented. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
