Abstract
This paper puts forward the design, construction and testing of a new automatic system for angular-response measurement and calibration in radiometric instruments. Its main characteristics include precision, speed, resolution, noise immunity, easy programming and operation. The developed system calculates the cosine error of the radiometer under test by means of a virtual instrument, from the measures it takes and through a mathematical procedure, thus allowing correcting the radiometer with the aim of preventing cosine error in its measurements.
Highlights
This paper puts forward the design, construction and testing of a new automatic system for angular-response measurement and calibration in radiometric instruments
The Lambert Law states that the lighting produced on a given surface by a punctual light source is proportional to the cosine of the angle of incidence
Radiometer maximum response is obtained when solar irradiance falls perpendicularly on the radiometer sensor surface, while its minimum response is obtained when the sun is on the horizon
Summary
This paper puts forward the design, construction and testing of a new automatic system for angular-response measurement and calibration in radiometric instruments. Reference [12] presents a different method for cosine-error measurement in a radiometric instrument by means of measurements from two broadband instruments aimed at studying the angular response of a Brewer spectroradiometer: one for global and the other for diffuse irradiance measurement. To determine the angular response of a given radiometric instrument, different trials and tests must be completed both in lab and in the study field [18,19]. Technique), in its headquarters in El Arenosillo (Mazagón, Huelva, Spain) This system was successfully tested first in an international campaign on intercomparison in 2007 for the measurement and calibration of 22 radiometric instruments from different countries [20]. This paper includes an appendix and an acknowledgment section
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