Solar irradiance measurements by means of optical fibers and silicon detectors

A. Corrons; A. Pons

doi:10.1364/AO.18.002902

Applied Optics
Vol. 18,
Issue 16,
pp. 2902-2904
(1979)
•https://doi.org/10.1364/AO.18.002902

Solar irradiance measurements by means of optical fibers and silicon detectors

A. Corrons and A. Pons

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A. Corrons and A. Pons, "Solar irradiance measurements by means of optical fibers and silicon detectors," Appl. Opt. 18, 2902-2904 (1979)

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Abstract

An experimental system has been constructed for the continuous measurement of solar irradiance using silicon diode detectors not directly exposed to solar radiation. The received incident solar radiation is conducted from the roof of the building to the detectors by an optical fiber. An electronic computer receives the signal and processes it, introducing the necessary corrections to calculate the total solar irradiance in W m⁻². The system measures with a proved accuracy to better than 3%.

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α	Cosα	Measurement value	Difference (%)
+80	0.1736	0.1696	−2.3
+70	0.3420	0.3435	+0.4
+60	0.5000	0.4986	−0.3
+50	0.6428	0.6413	−0.2
+40	0.7660	0.7690	+0.4
+30	0.8660	0.8712	+0.6
+20	0.9397	0.9456	+0.6
+10	0.9848	0.9918	+0.7
0	1	1	0.0
−10	0.9848	0.9891	+0.4
−20	0.9397	0.9484	+0.9
−30	0.8660	0.8712	+0.6
−40	0.7660	0.7663	+0.1
−50	0.6428	0.6446	+0.2
−60	0.5000	0.5011	+0.2
−70	0.3420	0.3451	40.9
−80	0.1736	0.1706	−1.7

Zenith angle of sun	Radiometers W m⁻²	Thermopile pyrheliometer W m⁻²	Difference (%)
80.7	460	461	−0.1
77.0	516	526	−1.9
69.5	638	636	+0.3
65.7	664	667	−0.4
61.9	753	751	+0.3
54.3	759	758	+0.1
50.5	816	817	−0.1
46.8	849	853	−0.4
39.7	851	867	−1.9
36.4	855	865	−1.2
30.3	814	835	−2.6
25.8	778	802	−3.0
24.3	776	802	−3.4
23.7	788	805	−2.0

α	Cosα	Measurement value	Difference (%)
+80	0.1736	0.1696	−2.3
+70	0.3420	0.3435	+0.4
+60	0.5000	0.4986	−0.3
+50	0.6428	0.6413	−0.2
+40	0.7660	0.7690	+0.4
+30	0.8660	0.8712	+0.6
+20	0.9397	0.9456	+0.6
+10	0.9848	0.9918	+0.7
0	1	1	0.0
−10	0.9848	0.9891	+0.4
−20	0.9397	0.9484	+0.9
−30	0.8660	0.8712	+0.6
−40	0.7660	0.7663	+0.1
−50	0.6428	0.6446	+0.2
−60	0.5000	0.5011	+0.2
−70	0.3420	0.3451	40.9
−80	0.1736	0.1706	−1.7

Zenith angle of sun	Radiometers W m⁻²	Thermopile pyrheliometer W m⁻²	Difference (%)
80.7	460	461	−0.1
77.0	516	526	−1.9
69.5	638	636	+0.3
65.7	664	667	−0.4
61.9	753	751	+0.3
54.3	759	758	+0.1
50.5	816	817	−0.1
46.8	849	853	−0.4
39.7	851	867	−1.9
36.4	855	865	−1.2
30.3	814	835	−2.6
25.8	778	802	−3.0
24.3	776	802	−3.4
23.7	788	805	−2.0

Abstract

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Equations (3)

Applied Optics