Department of Electrical Engineering and Automation

Metrology Research Institute

Metrology Research Institute focuses on optical radiation measurements and related activities.
Metrology research group, Xenon lamp. Photo by the research group

Light is everywhere around us in the form of sunlight, artificial lighting and signaling. Most electrical equipment use either visible or infrared radiation for signaling, displays, sensing, data read-out, or digital communication. Colour is one of the most significant properties in consumer products.

Metrology research of optical radiation measurements is divided into three branches:

  • Radiometry deals with characteristics of light sources and detectors
  • Photometry studies light as humans see it, and
  • Spectrophotometry investigates optical components as well as the optical properties of materials.

Some of the facilities, developed in the laboratory, are at world-leading level, when comparing accuracy, compactness, and operating costs. The group's research concentrates on electronics, modern optics and optical radiation measurements.

Metrology Research Institute is a joint laboratory between Aalto University and MIKES. It is involved in many national and international projects. Most of the research in the laboratory is currently carried out within the frameworks of EURAMET (European Association for Metrology) EPM (European Partnership for Metrology, 2021-2027), EMPIR (European Metrology Programme for Innovation and Research, 2014-2020), and EMRP (European Metrology Research Programme 2009-2013).

The Institute is the national standards laboratory for optical quantities in Finland, maintaining national standards of optical quantities and carrying out calibrations at the highest level. It has self-declared ISO 17025 compliance, participating in intercomparisons of CCPR (Consultative Commitee for Photometry and Radiometry) of BIPM (Bureau International de Poids et Mesures).

The research group is led by Professor Erkki Ikonen. See our detailed project descriptions for information about specific contact persons for each activity.

Research areas

Find out more about the key research areas of the Metrology Research Institute. The pages contain information about our latest projects. For information about our older projects see our Annual Reports Database.

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Photometry

Photometry is the measurement of visible light as perceived by humans. Our current focus is on increasing the accuracy of the energy efficiency measurements of novel light sources, such as LEDs and OLEDs.

Department of Electrical Engineering and Automation
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Radiometry

Radiometry deals with techniques for measuring electromagnetic radiation, in the form of ultraviolet radiation, visible light, and infrared radiation.

Department of Electrical Engineering and Automation
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Spectrophotometry

Spectrophotometry focuses on measuring the amount of light that a sample or an object absorbs or reflects as a function of wavelength using an instrument known as a spectrophotometer.

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Electrical instrumentation

Off-the-shelf measurement equipment are not always available, and dedicated measurement devices are often built at Metrology Research Institute.

Department of Electrical Engineering and Automation

Latest publications

Emissivity and Reflectivity Measurements for Passive Radiative Cooling Technologies

A. Adibekyan, J. Schumacher, L. Pattelli, J. Manara, S. Meriç, C. Cucchi, C. Sprengard, G. Pérez, J. Campos, J. Hameury, A. Andersson, S. Clausen, C. Belotti, S. Efthymiou, M. N. Assimakopoulos, D. Papadaki, F. Manoocheri, A. Llados, J. Jaramillo-Fernandez, T. Gionfini, M. Ortisi, A. Peter, M. Kleinbub, J. Bante, L. Donath, H. Herzog, C. Monte 2025 International Journal of Thermophysics

Reflectance metrology of thin films

Aleksandr Danilenko 2025

Reflectometry technique for study of complex multilayer micro- and nanostructures with lateral periodicity

Aleksandr Danilenko, Masoud Rastgou, Farshid Manoocheri, Jussi Kinnunen, Virpi Korpelainen, Antti Lassila, Erkki Ikonen 2025 Journal of Applied Physics

Identification of microplastics with cantilever enhanced photoacoustic spectroscopy in infrared region

Sudatta Das, Rita Fernandes, Juho Karhu, Blaz Hrovat, Arto Koistinen, Roberto Martins, Carlos Marques, Juha Toivonen, Erkki Ikonen 2025 Journal of Environmental Chemical Engineering

Results of an International Comparison of Indoor Photovoltaic Measurements Among Seven Metrological Institutes

Afsaneh Eghbali, Petri Kärhä, Erkki Ikonen, Ingo Kröger, Yean San Long, Min An Tsai, Karsten Bothe, David Hinken, Özcan Bazkir, Jimmy Dubard, Pierre Betis, George Koutsourakis, James Blakesley, Daniel E. Parsons, Stefan Winter 2025 Solar RRL

Reaching a consensus on indoor photovoltaics testing

Robert L.Z. Hoye, George Koutsourakis, Marina Freitag, Zacharie Jehl Li-Kao, Thomas Österberg, Simon Aliwell, Mathieu Bellanger, Thomas M. Brown, Francesca Brunetti, Matthew J. Carnie, Abhisek Chakraborty, Giulia Grancini, Petri Kärhä, Matthias Kauer, Thomas Kirchartz, Chieh Ting Lin, Monica Lira-Cantú, Yean San Long, Senol Öz, Sonia R. Raga, Edgardo Saucedo, Paola Vivo, Shin Woei Leow, Konrad Wojciechowski, Andrea Zampetti, Ru Zhou, Simon Züfle, Gregory Burwell 2025 Joule

Infrared-A (IR-A) modulates the p53 pathway and diurnal clock in human skin and subcutaneous adipose tissue in vivo

Iina Maria Häggqvist, Juha Jernman, Erna Snellman, Petri Kärhä, Rafael Pasternack, Timo Partonen, Piia Karisola 2025 Journal of Photochemistry and Photobiology B: Biology

Field-deployable cantilever-enhanced photoacoustic instrument for aerosol light absorption measurement at three wavelengths

Juho Karhu, Tommi Mikkonen, Joel Kuula, Aki Virkkula, Erkki Ikonen, Markku Vainio, Hilkka Timonen, Tuomas Hieta 2025 Aerosol Research

Sensitivity evaluation of measurement uncertainty contributions of spectral data for calculated integral quantities

U. Krüger, A. Ferrero, A. Thorseth, O. Pellegrino, J. Dubard, E. Ikonen, A. Sperling 2025 Lighting Research and Technology
More information on our research in the Aalto research portal.
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