Research output per year
Research output per year
Personal profile
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
Education/Academic qualification
Doctoral degree, Engineering and Technology, Helsinki University of Technology
Award Date: 16 Dec 1997
Licentiate degree, Engineering and Technology, Helsinki University of Technology
Award Date: 19 Dec 1995
Master's degree, Engineering and Technology, Helsinki University of Technology
Award Date: 26 Jan 1993
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Collaborations and top research areas from the last five years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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Infrared-A (IR-A) modulates the p53 pathway and diurnal clock in human skin and subcutaneous adipose tissue in vivo
Häggqvist, I. M., Jernman, J., Snellman, E., Kärhä, P., Pasternack, R., Partonen, T. & Karisola, P., Aug 2025, In: Journal of Photochemistry and Photobiology B: Biology. 269, 10 p., 113199.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile -
Results of an International Comparison of Indoor Photovoltaic Measurements Among Seven Metrological Institutes
Eghbali, A., Kärhä, P., Ikonen, E., Kröger, I., Long, Y. S., Tsai, M. A., Bothe, K., Hinken, D., Bazkir, Ö., Dubard, J., Betis, P., Koutsourakis, G., Blakesley, J., Parsons, D. E. & Winter, S., May 2025, In: Solar RRL. 9, 9, 16 p., 2400855.Research output: Contribution to journal › Article › Scientific › peer-review
Open Access -
Differential Spectral Responsivity of Solar Cells Measured with an LED Based Experimental Setup
Eghbali Yeldagermani, A., Ikonen, E. & Karha, P., 1 Jan 2024, 2023 Middle East and North Africa Solar Conference, MENA-SC 2023 - Proceedings. IEEE, 6 p. (2023 Middle East and North Africa Solar Conference, MENA-SC 2023 - Proceedings).Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review
Open AccessFile40 Downloads (Pure) -
Digital implementations for determination of temporal light artefacts of LED luminaires
Mantela, V., Nordlund, R., Askola, J., Kärhä, P. & Ikonen, E., Nov 2024, In: Lighting Research and Technology. 56, 7, p. 734-743 10 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile3 Citations (Scopus)28 Downloads (Pure) -
Evaluation of on-site calibration procedures for SKYNET Prede POM sun-sky photometers
Campanelli, M., Estellés, V., Kumar, G., Nakajima, T., Momoi, M., Gröbner, J., Kazadzis, S., Kouremeti, N., Karanikolas, A., Barreto, A., Nevas, S., Schwind, K., Schneider, P., Harju, I., Kärhä, P., Diémoz, H., Kudo, R., Uchiyama, A., Yamazaki, A. & Iannarelli, A. M. & 3 others, , 3 Sept 2024, In: Atmospheric Measurement Techniques. 17, 17, p. 5029-5050 22 p.Research output: Contribution to journal › Article › Scientific › peer-review
Open AccessFile2 Citations (Scopus)14 Downloads (Pure)
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NEWSTAND (EURAMET): New calibration standards and methods for radiometry and photometry after phaseout of incandescent lamps
Kärhä, P. (Principal investigator)
01/06/2023 → 31/05/2026
Project: EU Other competitive funding
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MeLiDos (EURAMET): Metrology for wearable light loggers and optical radiation dosimeters
Kärhä, P. (Principal investigator)
01/06/2023 → 31/05/2026
Project: EU Other competitive funding
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HiDyn (EURAMET): Support for the standardisation of luminance distribution measurements for assessing glare and obtrusive light using high-dynamic-range imaging systems
Kärhä, P. (Principal investigator)
01/10/2022 → 30/09/2025
Project: EU Other competitive funding
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HiDyn: Support for the standardisation of luminance distribution measurements for assessing glare and obtrusive light using high-dynamic-range imaging systems
Kärhä, P. (Principal investigator)
01/10/2022 → 31/01/2023
Project: EU other competitive funding (ERA-NET, EURAMET, EUREKA, EU JU)
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MetTLM (EMPIR): Metrology for temporal light modulation
Kärhä, P. (Principal investigator)
01/05/2021 → 30/04/2024
Project: EU Other competitive funding
Datasets
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Field of View measurements of Sunphotometers within the project 19ENV04 MAPP
Julian, G. (Creator), Kärhä, P. (Creator) & Harju, I. (Creator), Zenodo, 6 Apr 2023
DOI: 10.5281/zenodo.7805528, https://zenodo.org/record/7805529
Dataset
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Data from PV module energy rating standard IEC 61853-3 intercomparison
Friesen, G. (Contributor), Kokka, A. (Creator), Riechelmann, S. (Contributor), Valckenborg, R. (Contributor), Plag, F. (Contributor), Schinke, C. (Contributor), Kenny, R. (Contributor), Corbellini, G. (Contributor), Schweiger, M. (Contributor), Bothe, K. (Contributor), Herrmann, W. (Contributor), Gracia-Amillo, A. M. (Contributor), Driesse, A. (Contributor), Riedel-Lyngskær, N. (Contributor), Vogt, M. R. (Contributor), Music, E. (Contributor), Maham, K. (Contributor), Kärhä, P. (Contributor) & Blakesley, J. C. (Contributor), Zenodo, 18 Dec 2021
DOI: 10.5281/zenodo.5750185, https://zenodo.org/record/5750185
Dataset
Activities
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Opponent for Doctoral Dissertation
Kärhä, P. (Examiner)
15 Dec 2021Activity: Academic assessments › Pre-examination of doctoral thesis or acting as opponent to doctoral students or membership of doctoral thesis committee or board
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EMPIR PV-Enerate Partnering Meeting
Kärhä, P. (Visiting researcher)
21 Oct 2019 → 22 Oct 2019Activity: Visiting an external institution types › Visiting an external academic institution
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Japan-Finland Joint Symposium on Optics in Engineering
Kärhä, P. (Chair) & Ikonen, E. (Organiser)
26 Aug 2019 → 30 Aug 2019Activity: Participating in or organising an event types › Organization of a workshop, panel, session, tutorial or event
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National Physical Laboratory (NPL)
Kärhä, P. (Visiting researcher) & Laurila, T. (Visiting researcher)
26 Jun 2019 → 27 Jun 2019Activity: Visiting an external institution types › Visiting an external academic institution
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Tallinna Tehnikaulikool
Kärhä, P. (Visiting researcher)
29 Oct 2019Activity: Visiting an external institution types › Visiting an external academic institution
Press/Media
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Studies Conducted at Aalto University on Photovoltaics Recently Reported (Spectral Mismatch Uncertainty Estimation In Solar Cell Calibration Using Monte Carlo Simulation)
08/11/2023
1 item of Media coverage
Press/Media: Media appearance
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The President has appointed two new Principal university lecturers
07/06/2023
1 item of Media coverage
Press/Media: Media appearance