1983: First chlorophyll fluorescence meausurements on grass growing on contaminated soil, with TNO-TPD
1985-93: First laser chlorophyll fluorescence measurements on trees, with IROE-CNR, Florence.
1990: Laser Environmental Active Fluorosensor LEAF developed in NL.
1992: First sale of EARS Plant
Photosynthesis Meter (PPM) to European Space Agency.
1991-99: Several research projects with LEAF and PPM.
1998: Publication new fluorescence photosynthesis model (PDM).
1999: Patent on PPM.
2002-03: Project Plant-intelligent
Management Systems in Glass Horticulture (PIRSIG).
2004-08: PPM introduction in Chinese agriculture for reduction of herbicide use.
2012: miniPPM on the market: the smallest and lightest plant photo-synthesis meter ever.