Empirical radiometric correction of a silicon photodiode rotating shadowband pyranometer

Michalsky, Joseph; Harrison, L.; LeBaron, B.A.

doi:10.1016/s0038-092x(87)80036-1

Cited by 24 publications

(15 citation statements)

References 3 publications

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“…Results for both the uncorrected PSP (as typically 15 deployed) and the NREL-corrected PSP are included in our study. The three Yankee model TSR instruments had 16 experimental post-processing applied to test research algorithms under development (Michalsky et. al., 1987).…”

Section: Operation and Maintenance 30mentioning

confidence: 99%

Intercomparison of 51 radiometers for determining global horizontal irradiance and direct normal irradiance measurements

et al. 2016

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Accurate solar radiation measurements require properly installed and maintained radiometers with calibrations 8 traceable to the World Radiometric Reference (WRR). This study analyzes the performance of 51 commercially 9 available and prototype radiometers used for measuring global horizontal irradiances (GHI) or direct normal 10 irradiances (DNI). These include pyranometers, pyrheliometers, rotating shadowband radiometers (RSR) 2 , and a 11 pyranometer with an internal shading mask deployed at the National Renewable Energy Laboratory's (NREL) Solar 12 Radiation Research Laboratory (SRRL). The radiometers in this study were deployed for one year (from April 1, 13 2011, through March 31, 2012) and their measurements were compared under clear sky, partly cloudy, and mostly 14 cloudy conditions to reference values of low estimated measurement uncertainties. Mean Bias Difference (MBD) 15 and Root Mean Square Difference (RMSD) statistics were used as metrics to compare the GHI and DNI values 16 from individual instruments with concurrent measurements using the reference instruments over time intervals of 17 one-minute, 10-minute, and hourly averages. Deviations from the reference irradiance measurements were 18 calculated as a percent and W/m 2 of the reference value for solar zenith angles ranging from 17.5 degrees to 85 19 degrees (the range of available solar zenith angles throughout the year at SRRL, excluding data near sunrise and 20 sunset). Under clear-sky conditions when the solar zenith angle was less than 60 degrees, differences of less than 21 +5% were observed among all GHI and DNI measurements when compared to the reference radiometers. For GHI 22 these normalized differences increased up to +17% under mostly-cloudy and clear-sky conditions when the solar 23 zenith angle was greater than 60 degrees. The normalized differences were greater yet under mostly-cloudy 24 conditions (approaching +40%) for few DNI data sets at higher solar zenith angles. The intent of this paper is to 25 present a general overview of each radiometer's performance based on the instrumentation and environmental 26 conditions available at NREL.

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Section: Operation and Maintenance 30mentioning

confidence: 99%

Intercomparison of 51 radiometers for determining global horizontal irradiance and direct normal irradiance measurements

et al. 2016

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“…Incorporation of a narrowband mulitfilter instrument would further introduce spectral information to the scheme. If selected wavelengths are similar to MFRSR channels (refer to Michalsky et al 1987), then VSP direct-beam extraction would allow for Langley analysis of data. A particular feature of MFRSR entrance optics is their relatively small size.…”

Section: Discussionmentioning

confidence: 99%

A Variable Sky-View Platform for the Measurement of Ultraviolet Radiation

Kuchinke¹,

Núñez²

2003

J. Atmos. Oceanic Technol.

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One of the more difficult tasks confronting atmospheric researchers today is the acquisition of long-term radiometric measurements that encapsulate variability in the sky hemisphere as well as time. High quality spatial measurements would allow for a greater understanding of atmospheric processes, both specific to the site and between locations. This information would lead to further development of better spatial models for predicting future trends. This study develops a timer-controlled variable sky-view platform (VSP), designed to encapsulate both the spatial and temporal variation of radiation in the sky hemisphere for Hobart, Australia (42.90ЊS, 147.33ЊE). The VSP essentially allows for a sensor to move up and down inside a fixed cylinder, therefore causing the skyview factor to vary. A full description of the VSP design, electronics, and construction is given. Emphasis is on high-precision long-term operation under all weather conditions. A modeling scheme and output results illustrate the advantages of the VSP over current sky-observing instruments. It can accurately parameterize the direct and diffuse erythemal irradiance as well as the azimuthally integrated erythemal sky radiance distribution for every 2-min duration (at the current setting). In addition, all data can be obtained for clear-sky and cloudy conditions. The VSP is currently in use with the erythemal ultraviolet (UV) biometer 501-A manufactured by Solar Light Company, Inc. (SLC). As such, it provides an additional source of UV sky distribution data to the Hobart UVclimatology database.

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“…Also, the wellknown uncertainties of silicon photodiode sensors, namely, temperature-dependence of sensor response, cosine response errors, varying spectral atmospheric conditions etc. reported in various studies (Dirmhirn, 1968;Michalsky et al, 1987Michalsky et al, , 1991King and Myers, 1997) are not accounted for in this study. Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Barker, H. W., Curtis, T. J., Leontieva, E., and Stamnes, K.: Optical depth of overcast cloud across Canada: estimates based on surface pyranometer and satellite measurements, J.…”

Section: Appendix A: Calibration and Spectral Responsivity Of The Ml-mentioning

confidence: 99%

Shortwave surface radiation budget network for observing small-scale cloud inhomogeneity fields

Madhavan¹,

Kalisch²,

Macke³

2015

Preprint

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Abstract. As part of the High Definition Clouds and Precipitation for advancing Climate Prediction Observational Prototype Experiment (HOPE), a high spatial density network of 99 silicon photodiode pyranometers was set up around Jülich (10 km x 12 km area) from April to July 2013, to capture the variability in the radiation field at the surface induced by small-scale cloud inhomogeneity. Each of these autonomously operated pyranometer stations was equipped with weather sensors for simultaneous measurements of ambient air temperature and relative humidity. In this paper, we provide the details of this unique setup of the pyranometer network and the data analysis with initial quality screening procedure we adopted. We also present some exemplary cases consisting of the days with clear, broken cloudy and overcast skies to assess our spatio-temporal observations from the network, and validate their consistency with other collocated radiation measurements available during the HOPE period.

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Empirical radiometric correction of a silicon photodiode rotating shadowband pyranometer

Cited by 24 publications

References 3 publications

Intercomparison of 51 radiometers for determining global horizontal irradiance and direct normal irradiance measurements

Intercomparison of 51 radiometers for determining global horizontal irradiance and direct normal irradiance measurements

A Variable Sky-View Platform for the Measurement of Ultraviolet Radiation

Shortwave surface radiation budget network for observing small-scale cloud inhomogeneity fields

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