• Otakaari 5

1993 …2020

Research output per year

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Research Output

2020

Measurement setup for differential spectral responsivity of solar cells

Kärhä, P., Baumgartner, H., Askola, J., Kylmänen, K., Oksanen, B., Maham, K., Huynh, V. & Ikonen, E., 1 Jan 2020, In : OPTICAL REVIEW.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access
File
35 Downloads (Pure)
2019

Flat-field calibration method for hyperspectral frame cameras

Kokka, A., Pulli, T., Honkavaara, E., Markelin, L., Kärhä, P. & Ikonen, E., 6 Aug 2019, In : Metrologia. 8 p., 055001.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
92 Downloads (Pure)

General tool for estimating effects of unknown correlations on spectral integrals

Pulli, T., Vaskuri, A., Kärhä, P., Mäntynen, H. & Ikonen, E., 2019, p. 186-187.

Research output: Contribution to conferenceAbstractScientific

Influence of smart lighting control on the lifetime of high power LED luminaires

Askola, J., Baumgartner, H., Pulli, T., Kärhä, P. & Ikonen, E., 1 Jan 2019, In : IOP Conference Series: Earth and Environmental Science. 352, 1, 012043.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access
File
29 Downloads (Pure)

Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features

Baumgartner, H., Oksanen, B., Kärhä, P. & Ikonen, E., Nov 2019, In : IEEE Journal of Photovoltaics. 9, 6, p. 1631-1636 6 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
22 Downloads (Pure)

Proceedings of OIE 2019: The 13th Japan-Finland Joint Symposium on Optics in Engineering26-30 August 2019, in Espoo and Tallinn

Kärhä, P. (ed.), Ikonen, E. (ed.), Peiponen, K-E. (ed.) & Hayasaki, Y. (ed.), 2019, Espoo, Finland: Aalto University. 117 p.

Research output: Book/ReportAnthologyScientific

Open Access

Reduced lifetime of LED street luminaires due to adaptive control

Askola, J., Baumgartner, H., Pulli, T., Kärhä, P. & Ikonen, E., 2019, p. 214-215.

Research output: Contribution to conferenceAbstractScientific

2018

Key comparison CCPR-K1.a as an interlaboratory comparison of correlated color temperature

Karha, P., Vaskuri, A., Pulli, T. & Ikonen, E., 2 Mar 2018, In : Journal of Physics: Conference Series. 972, 1, 4 p., 012012.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access
File
1 Citation (Scopus)
82 Downloads (Pure)

LED based reference for wavelength and relative intensity

Baumgartner, H., Kylmanen, K., Kantamaa, O., Karha, P. & Ikonen, E., 2 Mar 2018, In : Journal of Physics: Conference Series. 972, 1, 5 p., 012010.

Research output: Contribution to journalConference articleScientificpeer-review

Open Access
File
1 Citation (Scopus)
90 Downloads (Pure)

Out-of-Range Stray Light Characterization of Single-Monochromator Brewer Spectrophotometers

Pulli, T., Karppinen, T., Nevas, S., Kärhä, P., Lakkala, K., Karhu, J., Sildoja, M-M., Vaskuri, A., Shpak, M., Manoocheri, F., Doppler, L., Gross, S., Mes, J. & Ikonen, E., 2018, In : ATMOSPHERE: OCEAN. 56, 1, p. 1-11 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
112 Downloads (Pure)

Relationships between junction temperature, electroluminescence spectrum and ageing of light-emitting diodes

Vaskuri, A., Kärhä, P., Baumgartner, H., Kantamaa, O., Pulli, T., Poikonen, T. & Ikonen, E., 15 Mar 2018, In : Metrologia. 55, 2, p. S86-S95

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
17 Citations (Scopus)
151 Downloads (Pure)

Uncertainty analysis of total ozone derived from direct solar irradiance spectra in the presence of unknown spectral deviations

Vaskuri, A., Kärhä, P., Egli, L., Gröbner, J. & Ikonen, E., 20 Jun 2018, In : Atmospheric Measurement Techniques. 11, 6, p. 3595-3610 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
1 Citation (Scopus)
104 Downloads (Pure)
2017

Facility for Determining Action Spectra of UV Photodegradation

Vaskuri, A., Kärhä, P., Anu, H. & Ikonen, E., 2017, Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). Davies, R., Egli, L. & Schmutz, W. (eds.). p. 1-4 4 p. 110011. (AIP Conference Proceedings; vol. 1810).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Method for estimating effects of unknown correlations in spectral irradiance data on uncertainties of spectrally integrated colorimetric quantities

Karha, P., Vaskuri, A., Mäntynen, H., Mikkonen, N. & Ikonen, E., 18 Jul 2017, In : Metrologia. 54, 4, p. 524-534 11 p.

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Monte Carlo analysis of uncertainty of total atmospheric ozone derived from measured spectra

Kärhä, P., Vaskuri, A., Gröbner, J., Egli, L. & Ikonen, E., 2017, RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN: International Radiation Symposium (IRC/IAMAS) - Radiation Processes in the Atmosphere and Ocean. American Institute of Physics, 4 p. 110005. (AIP Conference Proceedings; vol. 1810).

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)

Nonlinearity characterization of array spectroradiometers for the solar UV measurements

Pulli, T., Nevas, S., Gawhary, O. E., Van Den Berg, S., Askola, J., Kärhä, P., Manoocheri, F. & Ikonen, E., 10 Apr 2017, In : Applied Optics. 56, 11, p. 3077-3086 10 p.

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

UV exposure in artificial and natural weathering: A comparative study

Heikkilä, A., Kazadzis, S., Meinander, O., Vaskuri, A., Kärhä, P., Mylläri, V., Syrjälä, S. & Koskela, T., 22 Feb 2017, Radiation Processes in the Atmosphere and Ocean, IRS 2016: Proceedings of the International Radiation Symposium (IRC/IAMAS). American Institute of Physics, Vol. 1810. 110004

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Variability of daily UV index in Jokioinen, Finland, in 1995-2015

Heikkilä, A., Uusitalo, K., Kärhä, P., Vaskuri, A., Lakkala, K. & Koskela, T., 22 Feb 2017, Radiation Processes in the Atmosphere and Ocean, IRS 2016: Proceedings of the International Radiation Symposium (IRC/IAMAS). American Institute of Physics, Vol. 1810. 5 p. 110003

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2016

25 years of spectral UV measurements at Sodankylä, Finland

Lakkala, K., Anu, H., Kärhä, P., I., I., Karppinen, T., Karhu, J., Lindfors, A. V. & Meinander, O., 22 Apr 2016, p. 363.

Research output: Contribution to conferencePaperScientific

2 Citations (Scopus)

Model for simulating uncertainties of TOC from multispectral measurements

Kärhä, P., Vaskuri, A., Nikke, M., Gröbner, J., Egli, L. & Ikonen, E., 20 May 2016.

Research output: Contribution to conferencePaperScientific

Natural and accelerated ageing of LED lamps

Baumgartner, H., Renoux, D., Kärhä, P., Poikonen, T., Pulli, T. & Ikonen, E., 1 Dec 2016, In : Lighting Research and Technology. 48, 8, p. 930-942 13 p.

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Out-of-range stray light and NiSO4 filter characterization of single-monochromator Brewers

Pulli, T., Kärhä, P., Vaskuri, A., Shpak, M., Manoocheri, F., Karppinen, T., Karhu, J., Lakkala, K. & Mes, J., 17 May 2016.

Research output: Contribution to conferencePaperScientific

Out-of-range stray light characterization of single-monochromator Brewer spectrophotometer

Pulli, T., Kärhä, P., Karppinen, T., Karhu, J., Lakkala, K., Vaskuri, A., Shpak, M. & Mes, J., Mar 2016, In : UVNews. 11, p. 20-23 4 p.

Research output: Contribution to journalArticleScientific

Quantifying exceptionality of UV indices in Jokioinen, Finland, over the years 1995-2015

Heikkilä, A., Uusitalo, K., Kärhä, P., Vaskuri, A., Kaurola, J., Lakkala, K. & Koskela, T., 22 Apr 2016, p. 385.

Research output: Contribution to conferencePaperScientific

Review of challenges and disadvantages of possible LED-based photometric standards

Poikonen, T., Pulli, T., Dönsberg, T., Baumgartner, H., Kärhä, P. & Ikonen, E., 2016, Proceedings of CIE 2016 Lighting Quality and Energy Efficiency, Melbourne, Australia. CIE

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Sensitivity analysis of ozone retrieval using UV measurements and different retrieval methods

Egli, L., Gröbner, J., Blumthaler, M., Gawhary, O. E., Kärhä, P., Ingo, K., Alberto, R. & Mark, W., 22 Apr 2016, p. 74.

Research output: Contribution to conferencePaperScientific

Temperature invariant energy value in LED spectra

Baumgartner, H., Vaskuri, A., Kärhä, P. & Ikonen, E., 5 Dec 2016, In : Applied Physics Letters. 109, 23, 231103.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
7 Citations (Scopus)
114 Downloads (Pure)

Uncertainty evaluation of spectral integrals for LED lamps

Pulli, T., Vaskuri, A., Mäntynen, H., Kärhä, P. & Ikonen, E., 2016, PROCEEDINGS OF CIE 2016 LIGHTING QUALITY AND ENERGY EFFICIENCY. CIE, p. 89-93 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

UV Ageing Facility for Determining Action Spectra of Photodegradation for Translucent Materials

Vaskuri, A., Kärhä, P., Anu, H. & Ikonen, E., 22 Apr 2016, p. 329.

Research output: Contribution to conferencePaperScientific

2015

ACCURATE MEASUREMENT OF ILLUMINANCE AND LUMINOUS EFFICACY OF WHITE LED LAMPS

Ikonen, E., Pulli, T., Dönsberg, T., Poikonen, T., Manoocheri, F. & Kärhä, P., 2015, 28th CIE SESSION, Manchester, UNITED KINGDOM, June 28 July 4, 2015. Vienna, Austria: CIE, p. 138-139

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Advantages of white LED lamps and new detector technology in photometry

Pulli, T., Donsberg, T., Poikonen, T., Manoocheri, F., Karha, P. & Ikonen, E., 2015, In : LIGHT: SCIENCE & APPLICATIONS. 4, 1, p. 00000

Research output: Contribution to journalArticleScientificpeer-review

93 Citations (Scopus)

Effects of intelligent control on the lifetime of LED street lights

Baumgartner, H., Oksanen, J., Poikonen, T., Pulli, T., Kärhä, P. & Ikonen, E., 2015, 28th CIE SESSION, Manchester, UNITED KINGDOM, June 28 July 4, 2015. Vienna, Austria: CIE, p. 1662-1668

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

High-resolution setup for measuring wavelength sensitivity of photoyellowing of translucent materials

Vaskuri, A., Kärhä, P., Heikkilä, A. & Ikonen, E., 2015.

Research output: Contribution to conferencePaperScientific

High-resolution setup for measuring wavelength sensitivity of photoyellowing of translucent materials

Vaskuri, A., Karha, P., Heikkila, A. & Ikonen, E., 2015, In : Review of Scientific Instruments. 86, 10, p. 1-8 103103.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
7 Citations (Scopus)
146 Downloads (Pure)

Mathematical limitations of the CIE mesopic photometry system

Shpak, M., Kärhä, P. & Ikonen, E., 2015, In : Lighting Research and Technology. 49, 1, p. 111-121

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Methods for decreasing uncertainties in LED photometry

Dönsberg, T., Pulli, T., Sildoja, M., Poikonen, T., Baumgartner, H., Manoocheri, F., Kärhä, P. & Ikonen, E., 2015, 17th International Congress of Metrology (CIM 2015), Paris, France, September 21-24, 2015. Larquier, B. (ed.). EDP SCIENCES

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Modeling the spectral shape of InGaAlP-based red light-emitting diodes

Vaskuri, A., Baumgartner, H., Kärhä, P., Andor, G. & Ikonen, E., 2015, In : Journal of Applied Physics. 118, 20, p. 203103

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
8 Citations (Scopus)
154 Downloads (Pure)

Photoyellowing of transparent materials as quantified with a setup of lasers

Heikkilä, A., Vaskuri, A. & Kärhä, P., 2015, 7th European Weathering Symposium, Naples, Italy, September 16-18, 2015. Reichert, T. (ed.). Germany: Gesellshaft für Umweltsimulation e.V. GUS, p. 209-218

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

TOWARDS LED-BASED PHOTOMETRIC STANDARDS

Poikonen, T., Pulli, T., Dönsberg, T., Baumgartner, H., Kärhä, P. & Ikonen, E., 2015, 28th CIE SESSION, Manchester, UNITED KINGDOM, June 28 July 4, 2015. Vienna, Austria: CIE

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

2014

Adjustable power line impedance emulator for characterisation of energy-saving lighting products

Poikonen, T., Koskinen, T., Baumgartner, H., Kärhä, P. & Ikonen, E., 2014, CIE 2014 Lighting quality and energy efficiency conference, Kuala Lumpur, Malaysia, April 23-26, 2014. CIE, p. 403-407

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Adjustable Power Line Impedance Emulator for Characterization of Energy-Saving Lamps

Poikonen, T., Koskinen, T., Baumgartner, H., Kärhä, P. & Ikonen, E., 2014, Newrad 2014, Espoo, Finland, June 24-27, 2014. Park, S., Kärhä, P. & Ikonen, E. (eds.). Espoo: Aalto University, p. 348-349

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Advantages of a two-channel luminance meter for photopic and scotopic measurements in determining mesopic luminance

Kärhä, P., Shpak, M. & Ikonen, E., 2014, International conference on New Developments and Applications in Optical Radiometry (Newrad), Espoo, Finland, June 24-27, 2014. Park, S., Kärhä, P. & Ikonen, E. (eds.). Espoo: Aalto University, p. 261-262

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A temperature controller for high power light emitting diodes based on resistive heating and liquid cooling

Baumgartner, H., Vaskuri, A., Kärhä, P. & Ikonen, E., 2014, In : Applied Thermal Engineering. 71

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Calibration of spectral responsivity of imaging devices using led light sources

Ikonen, E., Hirvonen, J-M., Poikonen, T., Vaskuri, A. & Kärhä, P., 2014, CIE 2014 Lighting Quality and Energy Efficiency Conference, Kuala Lumpur, April 23-26 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Characterisation of nonlinearities of array spectroradiometers

Kärhä, P., Nevas, S., Blattner, P., Gawhary, O. E., Pulli, T., Egli, L. & Gröbner, J., 2014, Davos, Switzerland.

Research output: Working paperProfessional

Characterisation of nonlinearities of array spectroradiometers in use for measurements of the terrestrial solar UV irradiance

Nevas, S., Blattner, P., El Gawhary, O., Pulli, T., Kärhä, P., Egli, L. & Gröbner, J., 2014, International conference on New Developments and Applications in Optical Radiometry (Newrad), Espoo, Finland, June 24-27, 2014. Park, S., Kärhä, P. & Ikonen, E. (eds.). Espoo: Aalto University, p. 89-90

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Characterisation of nonlinearities of array spectroradiometers in use for measurements of the terrestrial solar UV irradiance

Nevas, S., Blattner, P., El Gawhary, O., Pulli, T., Kärhä, P., Egli, L. & Gröbner, J., 2014, In : UVNews. 10, p. 9-11

Research output: Contribution to journalArticleScientificpeer-review

Characterization of array spectroradiometers for solar UV measurements

Egli, L., Nevas, S., Blattner, P., El Gawhary, O., Kärhä, P. & Gröbner, J., 2014, CIE Expert Symposium on Measurement Uncertainties in Photometry and Radiometry for Industry, Vienna, Austria, September 12, 2014. Vienna, Austria: Comission International de l'Eclairage (CIE), p. 22

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

High-Resolution Setup for Measuring Photoyellowing of Transparent Materials

Vaskuri, A., Kärhä, P., Mylläri, V., Heikkilä, A. & Ikonen, E., 2014, p. 300-302.

Research output: Working paperProfessional

Improved diffusers for spectroradiometers measuring solar irradiance

Kärhä, P., Mes, J., Pulli, T., Schreder, J., Partosoebroto, A., Hülsen, G., Askola, J. & Gröbner, J., 2014, In : UVNews. 10, p. 25-27

Research output: Contribution to journalArticleScientificpeer-review