http://hdl.handle.net/10174/14421 2026-04-10T03:46:55Z http://hdl.handle.net/10174/32577 Title: System for simultaneously calibrating two or more solar radiation measuring pyranometers Authors: Canhoto, Paulo Abstract: System for calibrate two or more pyranometers that measure solar radiation, comprising an electronic data processor configured for generating a mean calibration constant of the pyranometers, by carrying out the steps of: installing a reference pyrheliometer with known calibration constant RDIR placed proximal to the pyranometers to be calibrated; acquiring measurements of direct normal irradiance; recording the average values VDIR×CZA, VDIF(i) with i = 1, ..., NDIF and VGBL(j) with j = 1, ..., NGBL at a same and synchronized averaging rate; fit a linear function in the form Y = M×X + B to the data points defined by X(i,j)_k = VDIF(i)_k/VGBL(j)_k and Y(i,j)_k = VDIR×CZA_k/VGBL(j)_k with k = 1,...,NREC; calculating a calibration constants of the i-th pyranometer measuring diffuse irradiance through RDIF(i,j) = -RDIR/M and of the j-th pyranometer measuring the global irradiance (1b) through RGBL(j,i) = RDIR/B; calculating a mean calibration constant for the i-th pyranometer measuring diffuse irradiance through RDIF(i) = (1/NGBL)×sum_j=1^NGBL (RDIF(I, j)), and a mean calibration constant for the j-th pyranometer measuring global irradiance through RGBL(j) = (1/NDIF)×sum_i=1^NDIF (RGBL(j,i)). 2022-09-06T23:00:00Z