1
|
Pulli T, Nevas S, El Gawhary O, van den Berg S, Askola J, Kärhä P, Manoocheri F, Ikonen E. Nonlinearity characterization of array spectroradiometers for the solar UV measurements. APPLIED OPTICS 2017; 56:3077-3086. [PMID: 28414366 DOI: 10.1364/ao.56.003077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Array spectroradiometers are attractive alternatives to scanning spectroradiometers in solar ultraviolet measurements. However, the measurement of solar spectral irradiance imposes stringent requirements for the linearity of the instruments. In this article, two array spectroradiometers were characterized for nonlinearity. Significant nonlinearities, in excess of 10%, as a function of analog-to-digital converter counts were discovered. Additional nonlinearities as a function of integration time were observed at very long integration times. No clear residual nonlinearity as a function of spectral irradiance was witnessed despite the characterization spanning four orders of magnitude of spectral irradiance. The characterizations were carried out with three measurement setups that are briefly compared.
Collapse
|
2
|
Gies P, Hooke R, McKenzie R, O'Hagan J, Henderson S, Pearson A, Khazova M, Javorniczky J, King K, Tully M, Kotkamp M, Forgan B, Rhodes S. International Intercomparison of Solar UVR Spectral Measurement Systems in Melbourne in 2013. Photochem Photobiol 2015; 91:1237-46. [PMID: 26147793 DOI: 10.1111/php.12492] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 06/17/2015] [Indexed: 11/27/2022]
Abstract
Monitoring ambient solar UVR levels provides information on how much there is in both real time and historically. Quality assurance of ambient measurements of solar UVR is critical to ensuring accuracy and stability and this can be achieved by regular intercomparisons of spectral measurement systems with those of other organizations. In October and November of 2013 a solar UVR spectroradiometer from Public Health England (PHE) was brought to Melbourne for a campaign of intercomparisons with a new Bentham spectrometer of Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) and one at the Australian Bureau of Meteorology (BOM), supported by New Zealand's National Institute for Water and Atmosphere (NIWA). Given all three spectroradiometers have calibrations that are traceable to various national standards, the intercomparison provides a chance to determine measurement uncertainties and traceability that support UV measurement networks in Australia, New Zealand and the UK. UV Index measurements from all three systems were compared and ratios determined for clear sky conditions when the scans from each instrument were within 2 min of each other. While wavelengths below 305 nm showed substantial differences between the PHE unit and the two other systems, overall the intercomparison results were encouraging, with mean differences in measured UV Index between the BOM/NIWA and those of PHE and ARPANSA of <0.1% and 7.5%, respectively.
Collapse
Affiliation(s)
- Peter Gies
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Melbourne, Vic., Australia
| | - Rebecca Hooke
- Public Health England (PHE), Didcot, Oxfordshire, UK
| | - Richard McKenzie
- National Institute of Water and Atmospheric Research (NIWA), Lauder, Central Otago, New Zealand
| | - John O'Hagan
- Public Health England (PHE), Didcot, Oxfordshire, UK
| | - Stuart Henderson
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Melbourne, Vic., Australia
| | - Andy Pearson
- Public Health England (PHE), Didcot, Oxfordshire, UK
| | | | - John Javorniczky
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Melbourne, Vic., Australia
| | - Kerryn King
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Melbourne, Vic., Australia
| | - Matt Tully
- Bureau of Meteorology (BOM), Melbourne, Vic., Australia
| | - Michael Kotkamp
- National Institute of Water and Atmospheric Research (NIWA), Lauder, Central Otago, New Zealand
| | - Bruce Forgan
- Bureau of Meteorology (BOM), Melbourne, Vic., Australia
| | | |
Collapse
|
3
|
Kreuter A, Blumthaler M. Stray light correction for solar measurements using array spectrometers. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:096108. [PMID: 19791979 DOI: 10.1063/1.3233897] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A stray light matrix correction method for array spectrometers is presented that is specifically tailored for solar spectral measurements. A stray light distribution function based on a single laser line measurement is approximated by an analytical function using three parameters only. This function is the basis for the stray light correction matrix. One cutoff filter is then used to adjust an offset parameter such that stray light corrected data are spectrally flat and around zero below the cutoff wavelength. This parameter also accounts for the IR contribution and has to be adjusted individually for each type of spectrum. A solid validation is given by intercomparison of calibrated solar spectra with a double-monochromator spectroradiometer. An agreement of 5% for wavelengths down to 307 nm and solar zenith angle smaller than 70 degrees is achieved.
Collapse
Affiliation(s)
- Axel Kreuter
- Department of Physiology and Medical Physics, Division for Biomedical Physics, Innsbruck Medical University, Mullerstrasse 44, 6020 Innsbruck, Austria
| | | |
Collapse
|
4
|
Stark H, Lerner BM, Schmitt R, Jakoubek R, Williams EJ, Ryerson TB, Sueper DT, Parrish DD, Fehsenfeld FC. Atmospheric in situ measurement of nitrate radical (NO3
) and other photolysis rates using spectroradiometry and filter radiometry. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007578] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- H. Stark
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - B. M. Lerner
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | | | - R. Jakoubek
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - E. J. Williams
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - T. B. Ryerson
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - D. T. Sueper
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - D. D. Parrish
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - F. C. Fehsenfeld
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| |
Collapse
|
5
|
Ylianttila L, Visuri R, Huurto L, Jokela K. Evaluation of a Single-monochromator Diode Array Spectroradiometer for Sunbed UV-radiation Measurements¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb00192.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
6
|
Ylianttila L, Visuri R, Huurto L, Jokela K. Evaluation of a Single-monochromator Diode Array Spectroradiometer for Sunbed UV-radiation Measurements¶. Photochem Photobiol 2005. [DOI: 10.1562/2004-06-02-ra-184.1] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
7
|
Hofzumahaus A. Photolysis frequency of O3to O(1D): Measurements and modeling during the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI). ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd004333] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
8
|
Bohn B. Measurement of atmospheric O3→ O(1D) photolysis frequencies using filterradiometry. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd004319] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
9
|
Monks PS. Attenuation of spectral actinic flux and photolysis frequencies at the surface through homogenous cloud fields. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd004076] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
10
|
Bais AF. International Photolysis Frequency Measurement and Model Intercomparison (IPMMI): Spectral actinic solar flux measurements and modeling. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002891] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
11
|
Cantrell CA. Overview and conclusions of the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) study. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002962] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
12
|
Shetter RE. Photolysis frequency of NO2: Measurement and modeling during the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI). ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002932] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|