Global rainbow thermometry (GRT) measures the mean size and temperature of an ensemble of spray droplets. The domain of validity of the Airy theory for this technique is established through comparison with Lorenz-Mie theory. The temperature derivation from the inflection points of the Airy rainbow pattern appears to be independent of the type of spray dispersion. Measurements in a water spray are reported. The mean diameter obtained from the rainbow pattern lies between the arithmetic and the Sauter mean diameters measured by phase Doppler anemometry. The temperature measurement by GRT is shown to be accurate within a few degrees Celsius.
© 2003 Optical Society of America
(010.1110) Atmospheric and oceanic optics : Aerosols
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(120.6780) Instrumentation, measurement, and metrology : Temperature
(290.0290) Scattering : Scattering
Jeronimus Petrus Antonius Johannes van Beeck, Thomas Grosges, and Maria Grazia De Giorgi, "Global Rainbow Thermometry Assessed by Airy and Lorenz-Mie Theories and Compared with Phase Doppler Anemometry," Appl. Opt. 42, 4016-4022 (2003)