Field calibration unit for ultraviolet spectroradiometers

Edward A. Early; E. Ambler Thompson; Patrick Disterhoft

doi:10.1364/AO.37.006664

Applied Optics
Vol. 37,
Issue 28,
pp. 6664-6670
(1998)
•https://doi.org/10.1364/AO.37.006664

Field calibration unit for ultraviolet spectroradiometers

Edward A. Early, E. Ambler Thompson, and Patrick Disterhoft

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Edward A. Early, E. Ambler Thompson, and Patrick Disterhoft, "Field calibration unit for ultraviolet spectroradiometers," Appl. Opt. 37, 6664-6670 (1998)

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Abstract

Horizontal standard lamps calibrate the spectral irradiance responsivity of spectroradiometers that measure solar ultraviolet irradiance. A field calibration unit and power supply developed to meet the requirements for using these standards in the field are described and their operation and associated uncertainties are detailed. Results from assessments obtained at two field instrument intercomparisons indicate that the horizontal standard, field calibration unit, and power supply operate within the design tolerances, making them suitable for performing routine calibrations in the field on most ultraviolet spectroradiometers.

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Lamp	Effecta	Wavelength (nm)
Lamp	Effecta	280	300	320	340	360	380	400
FASCAL	R	0.21	0.17	0.12	0.09	0.06	0.04	0.03
	S	0.60	0.55	0.50	0.46	0.42	0.40	0.38
rss total		0.64	0.58	0.51	0.47	0.42	0.40	0.38
Secondary	R	0.56	0.44	0.45	0.26	0.29	0.29	0.32
	S	0.71	0.66	0.61	0.57	0.53	0.51	0.50
rss total		0.90	0.79	0.76	0.63	0.60	0.59	0.59
Horizontal	R	1.32	0.62	0.54	0.53	0.37	0.43	0.59
	S	0.83	0.78	0.74	0.71	0.68	0.67	0.66
rss total		1.56	1.00	0.92	0.89	0.77	0.80	0.89

Component of Uncertainty	Effecta	Wavelength (nm)
Component of Uncertainty	Effecta	290	307.5	325	342.5	360
Lamp irradiance	R	0.91	0.60	0.55	0.51	0.37
Lamp irradiance	S	0.80	0.76	0.73	0.71	0.68
Lamp current	R	0.06	0.05	0.05	0.05	0.05
Lamp current	S	0.11	0.10	0.10	0.09	0.09
Alignment	S	0.39	0.39	0.39	0.39	0.39
Diffuser size	S	0.47	0.47	0.47	0.47	0.47
Wavelength	S	0.23	0.02	0.04	0	0.10
Signal	R	0.60	0.33	0.43	0.38	0.30
rss total		1.51	1.19	1.19	1.14	1.04

Lamp	Effecta	Wavelength (nm)
Lamp	Effecta	280	300	320	340	360	380	400
FASCAL	R	0.21	0.17	0.12	0.09	0.06	0.04	0.03
	S	0.60	0.55	0.50	0.46	0.42	0.40	0.38
rss total		0.64	0.58	0.51	0.47	0.42	0.40	0.38
Secondary	R	0.56	0.44	0.45	0.26	0.29	0.29	0.32
	S	0.71	0.66	0.61	0.57	0.53	0.51	0.50
rss total		0.90	0.79	0.76	0.63	0.60	0.59	0.59
Horizontal	R	1.32	0.62	0.54	0.53	0.37	0.43	0.59
	S	0.83	0.78	0.74	0.71	0.68	0.67	0.66
rss total		1.56	1.00	0.92	0.89	0.77	0.80	0.89

Component of Uncertainty	Effecta	Wavelength (nm)
Component of Uncertainty	Effecta	290	307.5	325	342.5	360
Lamp irradiance	R	0.91	0.60	0.55	0.51	0.37
Lamp irradiance	S	0.80	0.76	0.73	0.71	0.68
Lamp current	R	0.06	0.05	0.05	0.05	0.05
Lamp current	S	0.11	0.10	0.10	0.09	0.09
Alignment	S	0.39	0.39	0.39	0.39	0.39
Diffuser size	S	0.47	0.47	0.47	0.47	0.47
Wavelength	S	0.23	0.02	0.04	0	0.10
Signal	R	0.60	0.33	0.43	0.38	0.30
rss total		1.51	1.19	1.19	1.14	1.04

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Equations (1)

Applied Optics