Petri Kärhä

Petri Kärhä is a Senior University Lecturer at the Department of Electrical Engineering and Automation, Aalto University, and a member of the Metrology Research Institute. His research focuses on metrological standards for photovoltaic systems, light measurement technologies, and biological effects of light exposure. He holds a Principal University Lecturer position and has contributed to international collaborations in metrology and photobiology.

His work spans experimental setups for solar cell calibration, LED luminaire optimization, and the application of infrared-A radiation in biological studies. Key areas of expertise include photometric instrumentation, temporal light artefacts in lighting systems, and environmental monitoring via sun-sky photometers.

Publications highlight advancements in solar energy measurement accuracy, LED lighting efficiency, and the physiological impacts of light wavelengths. His research bridges engineering, environmental science, and biomedical disciplines, with a focus on practical applications in renewable energy and human health.