Multiwavelength sun-photometers for accurate measurements of atmospheric extinction in the visible and near-IR spectral range

Claudio Tomasi; Franco Prodi; Monica Sentimenti; Giulio Cesari

doi:10.1364/AO.22.000622

Applied Optics
Vol. 22,
Issue 4,
pp. 622-630
(1983)
•https://doi.org/10.1364/AO.22.000622

Multiwavelength sun-photometers for accurate measurements of atmospheric extinction in the visible and near-IR spectral range

Claudio Tomasi, Franco Prodi, Monica Sentimenti, and Giulio Cesari

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Claudio Tomasi, Franco Prodi, Monica Sentimenti, and Giulio Cesari, "Multiwavelength sun-photometers for accurate measurements of atmospheric extinction in the visible and near-IR spectral range," Appl. Opt. 22, 622-630 (1983)

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Abstract

A new multiwavelength sun-photometer has been developed to obtain accurate measurements of the atmospheric attenuation of direct solar radiation at seven window wavelengths in the visible and near-infrared spectral range. The instrument’s optical features and performance are described. The photometer was calibrated by following a careful procedure based on the Langley method. An additional eighth bandpass filter was used to obtain measurements of the precipitable water. Five examples of this instrument have been constructed and calibrated for a network of mountain stations in Southern Italy to monitor Sahara dust transport episodes.

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Filter number	Sun-photometer A		Sun-photometer B		Sun-photometer C		Sun-photometer D		Sun-photometer E
Filter number	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å
1	4002	95	4006	95	3994	95	3989	94	3988	94
2	4415	88	4415	88	4415	88	4413	88	4414	88
3	5006	78	5091	105	5049	88	5121	114	5137	118
4	5500	88	5498	88	5498	88	5588	88	5512	102
5	6697	108	6697	107	6699	108	6714	112	6694	108
6	8680	81	8795	106	8780	132	8803	131	8811	132
7	9472	118	9473	116	9476	116	9478	116	9480	117
8	10406	94	10408	88	10412	92	10416	94	10418	94

Filter number	Sun-photometer A	Sun-photometer B	Sun-photometer C	Sun-photometer D	Sun-photometer E
Filter number	J₀(λ),V	J₀(λ),V	J₀(λ),V	J₀(λ),V	J₀(λ),V
1	0.376 ± 0.016	0.558 ± 0.017	0.395 ± 0.034	0.287 ± 0.020	0.397 ± 0.021
2	0.910 ± 0.056	1.429 ± 0.027	1.010 ± 0.036	0.852 ± 0.020	0.954 ± 0.027
3	3.729 ± 0.220	6.793 ± 0.190	5.324 ± 0.174	5.593 ± 0.201	5.102 ± 0.132
4	5.416 ± 0.337	9.554 ± 0.213	6.310 ± 0.225	5.661 ± 0.165	6.957 ± 0.199
5	7.696 ± 0.433	12.486 ± 0.206	8.497 ± 0.406	8.070 ± 0.323	7.709 ± 0.126
6	4.104 ± 0.152	9.704 ± 0.171	6.167 ± 0.063	6.175 ± 0.214	5.589 ± 0.086
8	1.383 ± 0.032	2.384 ± 0.069	1.095 ± 0.010	1.771 ± 0.045	1.362 ± 0.028

Sun-photometer	G₀	k, (cm STP)^−0.5	r
A	6.9244	0.7787	−0.994
B	6.1569	0.7482	−0.988
C	9.0458	0.7943	−0.991
D	7.0824	0.7929	−0.991
E	7.0234	0.7764	−0.993

Filter number	Sun-photometer A		Sun-photometer B		Sun-photometer C		Sun-photometer D		Sun-photometer E
Filter number	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å	λ_p,Å	Δλ,Å
1	4002	95	4006	95	3994	95	3989	94	3988	94
2	4415	88	4415	88	4415	88	4413	88	4414	88
3	5006	78	5091	105	5049	88	5121	114	5137	118
4	5500	88	5498	88	5498	88	5588	88	5512	102
5	6697	108	6697	107	6699	108	6714	112	6694	108
6	8680	81	8795	106	8780	132	8803	131	8811	132
7	9472	118	9473	116	9476	116	9478	116	9480	117
8	10406	94	10408	88	10412	92	10416	94	10418	94

Filter number	Sun-photometer A	Sun-photometer B	Sun-photometer C	Sun-photometer D	Sun-photometer E
Filter number	J₀(λ),V	J₀(λ),V	J₀(λ),V	J₀(λ),V	J₀(λ),V
1	0.376 ± 0.016	0.558 ± 0.017	0.395 ± 0.034	0.287 ± 0.020	0.397 ± 0.021
2	0.910 ± 0.056	1.429 ± 0.027	1.010 ± 0.036	0.852 ± 0.020	0.954 ± 0.027
3	3.729 ± 0.220	6.793 ± 0.190	5.324 ± 0.174	5.593 ± 0.201	5.102 ± 0.132
4	5.416 ± 0.337	9.554 ± 0.213	6.310 ± 0.225	5.661 ± 0.165	6.957 ± 0.199
5	7.696 ± 0.433	12.486 ± 0.206	8.497 ± 0.406	8.070 ± 0.323	7.709 ± 0.126
6	4.104 ± 0.152	9.704 ± 0.171	6.167 ± 0.063	6.175 ± 0.214	5.589 ± 0.086
8	1.383 ± 0.032	2.384 ± 0.069	1.095 ± 0.010	1.771 ± 0.045	1.362 ± 0.028

Abstract

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Applied Optics