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Title: Uncertainty Analysis for Broadband Solar Radiometric Instrumentation Calibrations and Measurements: An Update; Preprint

The measurement of broadband solar radiation has grown in importance since the advent of solar renewable energy technologies in the 1970's, and the concern about the Earth's radiation balance related to climate change in the 1990's. In parallel, standardized methods of uncertainty analysis and reporting have been developed. Historical and updated uncertainties are based on the current international standardized uncertainty analysis method. Despite the fact that new and sometimes overlooked sources of uncertainty have been identified over the period 1988 to 2004, uncertainty in broadband solar radiometric instrumentation remains at 3% to 5% for pyranometers, and 2% to 3% for pyrheliometers. Improvements in characterizing correction functions for radiometer data may reduce total uncertainty. We analyze the theoretical standardized uncertainty sensitivity coefficients for the instrumentation calibration measurement equation and highlight the single parameter (thermal offset voltages), which contributes the most to the observed calibration responsivities.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
15007610
Report Number(s):
NREL/CP-560-36201
TRN: US200419%%278
DOE Contract Number:
AC36-99-GO10337
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Apr 2004; Related Information: Prepared for the World Renewable Energy Congress VIII, 29 August --3 September 2004, Denver, Colorado
Research Org:
National Renewable Energy Lab., Golden, CO (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; CALIBRATION; CLIMATES; PYRANOMETERS; PYRHELIOMETERS; RADIATIONS; RADIOMETERS; SENSITIVITY; SOLAR RADIATION; SOLAR ENERGY BROADBAND SOLAR RADIATION; UNCERTAINTY ANALYSIS; INTERNATIONAL STANDARDIZED UNCERTAINTY ANALYSIS METHOD; SOLAR ENERGY - RADIATION