Geometric Parameter Determination by Ray Tracing of a Radiation-Absorbing Cavity Painted with Specular Ink

The measurement of total solar irradiance onboard satellites allowed obtaining more accurate data due to atmospheric absence. The instruments used in these measurements are electrical substitution radiometers, which use cavity-type sensors. This work shows the ideal geometric parameters for these se...

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Bibliographic Details
Published in:Brazilian journal of physics 2022-06, Vol.52 (3), Article 103
Main Authors: Berni, Luiz Angelo, Irita, Ricardo Toshiyuki, Vilela, Waldeir Amaral
Format: Article
Language:English
Subjects:
Cylinders
Diameters
General and Applied Physics
Irradiance
Parameters
Physics
Physics and Astronomy
Ray tracing
Sensors
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Summary:The measurement of total solar irradiance onboard satellites allowed obtaining more accurate data due to atmospheric absence. The instruments used in these measurements are electrical substitution radiometers, which use cavity-type sensors. This work shows the ideal geometric parameters for these sensors considering a paint with specular characteristics. The study was carried out using non-sequential ray tracing for a cone and for a cone-cylinder cavity. The best results were obtained for a cone length to diameter ratio of 1.5 whereas for a cylinder, a reduction of up to 80% could be obtained.
ISSN:0103-9733
1678-4448
DOI:10.1007/s13538-022-01105-8