Experiment to determine ideal height for sensor placement when using accelerometers to measure tree canopy mass change.

Multiple groups are currently trying to estimate evaporation by measuring mass change in tree canopy using accelerometers. This is based on the idea that the Eigenfrequency at which trees oscilate in the wind depend on the mass of the canopy. We present the results of a controlled experiment where we study what the optimal height is to mount the accelerometer. Multiple accelerometers are placed at different heights along the tree stem. Artificial wieghts are added to the tree to simulate change of canopy mass in a controlled way. Measurements are done when the trees are swaying in the wind, as well as when they artificially stimulated using strings and quick releases. High speed footage of these experiments will be combined with the sensor readings to estimate the optimal place for acceleratometer placement.