Research output per year
Research output per year
- 1 - 50 out of 87 results
Search results
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2024
Spectral analysis of deviations from key comparison reference values
Maham, K., Kosonen, V., Peltoniemi, J., Kärhä, P. & Ikonen, E., 2 Feb 2024, In: Metrologia. 61, 1, 8 p., 015002.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile1 Citation (Scopus)45 Downloads (Pure) -
2023
Digital implementations for determination of temporal light artefacts of LED luminaires
Mantela, V., Nordlund, R., Askola, J., Kärhä, P. & Ikonen, E., 29 Nov 2023, (E-pub ahead of print) In: Lighting Research and Technology. 10 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile1 Citation (Scopus)16 Downloads (Pure) -
Spectral Mismatch Uncertainty Estimation in Solar Cell Calibration Using Monte Carlo Simulation
Maham, K., Karha, P. & Ikonen, E., 1 Nov 2023, In: IEEE Journal of Photovoltaics. 13, 6, p. 899-904 6 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile1 Citation (Scopus)59 Downloads (Pure) -
2022
Effect of adaptive control on the LED street luminaire lifetime and on the lifecycle costs of a lighting installation
Askola, J., Kärhä, P., Baumgartner, H., Porrasmaa, S. & Ikonen, E., Jan 2022, In: Lighting Research and Technology. 54, 1, p. 75-89 15 p., 14771535211008179.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile4 Citations (Scopus)94 Downloads (Pure) -
In-Space Radiometric Calibration of Nanosatellite Camera
Knuuttila, O., Kallio, E., Partamies, N., Syrjäsuo, M., Kauristie, K., Sofieva, V., Harri, A-M., Kestilä, A., Kivekäs, J., Koskimaa, P., Rynö, J., Tamminen, J., Kärhä, P., Lukkari, J-M., Alho, A. & Pulkkinen, T., 6 Oct 2022, In: JOURNAL OF SMALL SATELLITES. 11, 3, p. 1165-1186 22 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open Access -
PV Module Energy Rating Standard IEC 61853-3 Intercomparison and Best Practice Guidelines for Implementation and Validation
Ruben Vogt, M., Riechelmann, S., Gracia-Amillo, A. M., Driesse, A., Kokka, A., Maham, K., Karha, P., Kenny, R., Schinke, C., Bothe, K., Blakesley, J., Music, E., Plag, F., Friesen, G., Corbellini, G., Riedel-Lyngskar, N., Valckenborg, R., Schweiger, M. & Herrmann, W., May 2022, In: IEEE Journal of Photovoltaics. 12, 3, p. 844-852 9 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open Access5 Citations (Scopus) -
2021
Increased detector response in optical overfilled measurements due to gas lens formation by nitrogen flow through the entrance aperture
Askola, J., Maham, K., Kärhä, P. & Ikonen, E., Oct 2021, In: Metrologia. 58, 5, 5 p., 055008.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile3 Citations (Scopus)75 Downloads (Pure) -
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 Apr 2020, In: OPTICAL REVIEW. 27, 2, p. 195 - 204 10 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile9 Citations (Scopus)234 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 journal › Article › Scientific › peer-review
Open AccessFile9 Citations (Scopus)176 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 journal › Article › Scientific › peer-review
Open AccessFile2 Citations (Scopus)79 Downloads (Pure) -
2018
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 journal › Article › Scientific › peer-review
Open AccessFile258 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-S95Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile36 Citations (Scopus)232 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 journal › Article › Scientific › peer-review
Open AccessFile9 Citations (Scopus)172 Downloads (Pure) -
2017
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 journal › Article › Scientific › peer-review
11 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 journal › Article › Scientific › peer-review
14 Citations (Scopus) -
2016
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 journal › Article › Scientific › peer-review
10 Citations (Scopus) -
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 journal › Article › Scientific
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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 journal › Article › Scientific › peer-review
Open AccessFile12 Citations (Scopus)225 Downloads (Pure) -
2015
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. 00000Research output: Contribution to journal › Article › Scientific › peer-review
Open Access185 Citations (Scopus) -
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 journal › Article › Scientific › peer-review
Open AccessFile9 Citations (Scopus)279 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. 111-121Research output: Contribution to journal › Article › Scientific › peer-review
6 Citations (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. 203103Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile12 Citations (Scopus)370 Downloads (Pure) -
2014
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. 71Research output: Contribution to journal › Article › Scientific › peer-review
15 Citations (Scopus) -
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. 9-11Research output: Contribution to journal › Article › Scientific › peer-review
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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. 25-27Research output: Contribution to journal › Article › Scientific › peer-review
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Luminance meter for photopic and scotopic measurements in the mesopic range
Shpak, M., Kärhä, P., Porrovecchio, G., Smid, M. & Ikonen, E., 2014, In: Measurement Science and Technology. 25, 9Research output: Contribution to journal › Article › Scientific › peer-review
9 Citations (Scopus) -
New source and detector technology for the realization of photometric units
Dönsberg, T., Pulli, T., Poikonen, T., Baumgartner, H., Vaskuri, A., Sildoja, M., Manoocheri, F., Kärhä, P. & Ikonen, E., 2014, In: Metrologia. 51, 6, p. S276S281Research output: Contribution to journal › Article › Scientific › peer-review
20 Citations (Scopus) -
Photoyellowing revisited: Determination of an action spectrum of newspaper
Heikkilä, A. & Kärhä, P., 2014, In: Polymer Degradation and Stability. 99, 1, p. 190-195Research output: Contribution to journal › Article › Scientific › peer-review
9 Citations (Scopus) -
2013
A method for optimizing the cosine response of solar UV diffusers
Pulli, T., Kärhä, P. & Ikonen, E., 2013, In: Journal of Geophysical Research. 118, 14, p. 7897-7904Research output: Contribution to journal › Article › Scientific › peer-review
13 Citations (Scopus) -
Software for designing solar UV diffusers
Pulli, T., Kärhä, P., Mes, J. & Schreder, J., 2013, In: UVNews. 9, p. 7-9Research output: Contribution to journal › Article › Scientific
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Spectrally adjustable quasi-monochromatic radiance source based on LEDs and its application for measuring spectral responsivity of a luminance meter
Hirvonen, J-M., Poikonen, T., Vaskuri, A., Karha, P. & Ikonen, E., 2013, In: Measurement Science and Technology. 24, 11, p. 115201Research output: Contribution to journal › Article › Scientific › peer-review
11 Citations (Scopus) -
2012
Double-coiled tungsten filament lamps as absolute spectral irradiance reference sources
Ojanen, M., Karha, P., Nevas, S., Sperling, A., Mantynen, H. & Ikonen, E., 2012, In: Metrologia. 49, 2, p. pp. S53-S58Research output: Contribution to journal › Article › Scientific › peer-review
6 Citations (Scopus) -
Luminous efficacy measurement of solid-state lamps
Poikonen, T., Pulli, T., Vaskuri, A., Baumgartner, H., Karha, P. & Ikonen, E., 2012, In: Metrologia. 49, 2, p. pp. S135-S140Research output: Contribution to journal › Article › Scientific › peer-review
13 Citations (Scopus) -
Uncertainty analysis of photometer directional response index f2 using Monte Carlo simulation
Poikonen, T., Blattner, P., Kärhä, P. & Ikonen, E., 2012, In: Metrologia. 49, 6, p. 727-736Research output: Contribution to journal › Article › Scientific › peer-review
5 Citations (Scopus) -
2011
A novel facility for ageing materials with narrow-band ultraviolet radiation exposure
Karha, P., Heikkila, A., Ruokolainen, K. & Kaunismaa, M., 2011, In: Review of Scientific Instruments. 82, 2, p. 023107Research output: Contribution to journal › Article › Scientific › peer-review
5 Citations (Scopus) -
2010
Comparison of the radiation temperature scales between MIKES and PTB
Ojanen, M., Anhalt, K., Hartmann, J., Schiller, S., Weckström, T., Kärhä, P., Heinonen, M. & Ikonen, E., 2010, In: Measurement. 43, 2, p. 183-189Research output: Contribution to journal › Article › Scientific › peer-review
3 Citations (Scopus) -
Multifunctional integrating sphere setup for luminous flux measurements of light emitting diodes
Poikonen, T., Manninen, P., Kärhä, P. & Ikonen, E., 2010, In: Review of Scientific Instruments. 81, 2Research output: Contribution to journal › Article › Scientific › peer-review
9 Citations (Scopus) -
Optical Temperature Measurement Method for Glowing Microcomponents
Shpak, M., Kärhä, P., Ojanen, M., Ikonen, E. & Heinonen, M., 2010, In: INTERNATIONAL JOURNAL OF THERMOPHYSICS. 31, 8-9, p. 1762-1770Research output: Contribution to journal › Article › Scientific › peer-review
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Optical Temperature Measurements of Silicon Microbridge Emitters
Shpak, M., Sainiemi, L., Ojanen, M., Kärhä, P., Heinonen, M., Franssila, S. & Ikonen, E., 2010, In: Applied Optics. 49, 9, p. 1489-1493Research output: Contribution to journal › Article › Scientific › peer-review
2 Citations (Scopus) -
Spectral irradiance model for tungsten halogen lamps in 340-850 nm wavelength range
Ojanen, M., Kärhä, P. & Ikonen, E., 2010, In: Applied Optics. 49, 5, p. 880-886Research output: Contribution to journal › Article › Scientific › peer-review
22 Citations (Scopus) -
Temperature measurements of a glowing microbridge
Shpak, M., Sainiemi, L., Ojanen, M., Kärhä, P., Heinonen, M., Franssila, S. & Ikonen, E., 2010, In: Applied Optics. 49, 9, p. 1489-1493Research output: Contribution to journal › Article › Scientific › peer-review
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2009
Characterizing a UV chamber with mercury lamps for assessment of comparability to natural UV conditions
Heikkilä, A., Kärhä, P., Tanskanen, A., Kaunismaa, M., Koskela, T., Kaurola, J., Ture, T. & Syrjälä, S., 2009, In: Polymer Testing. 28, p. 57-65Research output: Contribution to journal › Article › Scientific › peer-review
21 Citations (Scopus) -
Estimation of the optical receiving plane positions of solar spectroradiometers with spherical diffusers on the basis of spatial responsivity data
Manninen, P., Koskela, T., Ylianttila, L., Kärhä, P. & Ikonen, E., 2009, In: Optics Letters. 34, 20, p. 32413243Research output: Contribution to journal › Article › Scientific › peer-review
2 Citations (Scopus) -
Reducing thickness variation of hot rolled steel strip by non-circular backup roll geometry
Widmaier, T., Salmela, T., Kuosmanen, P., Juhanko, J., Kärhä, P. & Uusimäki, J., 2009, In: Ironmaking and Steelmaking. 36, 2, p. 133-140Research output: Contribution to journal › Article › Scientific › peer-review
8 Citations (Scopus) -
Report of the Spectral Irradiance Comparison EURAMET.PR-K1.a.1 between MIKES (Finland) and NIMT (Thailand)
Ojanen, M., Shpak, M., Kärhä, P., Leecharoen, R. & Ikonen, E., 2009, In: Metrologia. 46, 00, p. Tech.Suppl 02001Research output: Contribution to journal › Article › Scientific › peer-review
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Uncertainty analysis of photometer quality factor f1'
Poikonen, T., Kärhä, P., Manninen, P., Manoocheri, F. & Ikonen, E., 2009, In: Metrologia. 46, 00, p. 75-80Research output: Contribution to journal › Article › Scientific › peer-review
9 Citations (Scopus) -
Uncertainty evaluation for linking a bilateral comparison with the corresponding CIPM key comparison
Ojanen, M., Shpak, M., Kärhä, P., Leecharoen, R. & Ikonen, E., 2009, In: Metrologia. 46, p. 397-403Research output: Contribution to journal › Article › Scientific › peer-review
3 Citations (Scopus) -
2008
Determining the irradiance signal from an asymmetric source with directional detectors: Application to calibrations of radiometers with diffusers
Manninen, P., Kärha, P. & Ikonen, E., 2008, In: Applied Optics. 47, 26, p. 4714-4722Research output: Contribution to journal › Article › Scientific › peer-review
6 Citations (Scopus) -
Filter radiometers as a tool for quality assurance of temperature measurements with linear pyrometers
Ojanen, M., Ahtee, V., Noorma, M., Weckstrom, T., Karha, P. & Ikonen, E., 2008, In: INTERNATIONAL JOURNAL OF THERMOPHYSICS. 29, 3, p. 1084-1093Research output: Contribution to journal › Article › Scientific › peer-review
2 Citations (Scopus) -
Simple active method for reducing magnetic interference in a thermoelectrically cooled photomultiplier tube
Karha, P. & Jaakkola, T., 2008, In: Review of Scientific Instruments. 79, 4, p. 043102Research output: Contribution to journal › Article › Scientific › peer-review
3 Citations (Scopus)