Laadukkaan mittaamisen perusteet

Julkaisun paperiversio painettu helmikuussa 2012.vo

Triennial Report 2015 - 2017 - Metrology Research Institute

This triennial report summarizes the research carried out at the Metrology Research Institute of Aalto University during period 2015 - 2017. Close collaboration between the Institute and MIKES Metrology of VTT Technical Research Centre of Finland Ltd has continued after the merge of MIKES to VTT in the beginning of 2015, leading to many research highlights. An article on “Advantages of white LED lamps and new detector technology in photometry” by Pulli et al was published in Light: Science and Application (4, e332, 2015), a journal with high impact factor of 14.6. Another highlight of 2016 was the start and excellent results of the European PhotoLED project (Future photometry based on solid state lighting products), coordinated by Tuomas Poikonen at VTT and Aalto University. Finally, several oral contributions in top-class international conferences were achieved by researchers of the Institute: One invited talk and four oral contributions in the NEWRAD Conference (Tokyo 2017) and five oral contributions in the CIE Conference (Korea 2017)

Triennial Report 2015 - 2017 - Metrology Research Institute

This triennial report summarizes the research carried out at the Metrology Research Institute of Aalto University during period 2015 - 2017. Close collaboration between the Institute and MIKES Metrology of VTT Technical Research Centre of Finland Ltd has continued after the merge of MIKES to VTT in the beginning of 2015, leading to many research highlights. An article on “Advantages of white LED lamps and new detector technology in photometry” by Pulli et al was published in Light: Science and Application (4, e332, 2015), a journal with high impact factor of 14.6. Another highlight of 2016 was the start and excellent results of the European PhotoLED project (Future photometry based on solid state lighting products), coordinated by Tuomas Poikonen at VTT and Aalto University. Finally, several oral contributions in top-class international conferences were achieved by researchers of the Institute: One invited talk and four oral contributions in the NEWRAD Conference (Tokyo 2017) and five oral contributions in the CIE Conference (Korea 2017)

Mathematical limitations of the CIE mesopic photometry system

The International Commission on Illumination (CIE) has published a recommended system for mesopic photometry based on visual performance. The system provides means for determining mesopic photometric values based on measuring the spectral composition and intensity of light. The system uses an iterative calculation method. We investigate the conditions under which this system is applicable and identify potential problems with the iterative method. We show that the system works well for the vast majority of lighting applications. However, it has non-convergence and discontinuity issues for sources with very high and very low values of scotopic-photopic ratio. A set of parameterised formulae is presented that approximates the mesopic model and provides a continuous, closed-form solution for the adaptation level in all lighting conditions. </jats:p