Vertical Dendrometer (DV)

The Vertical dendrometer is designed to determine vertical changes (not growth) of trees continuously. Tree stems and their respective sections vary in length and curvature, according to water status (short- to mid-term) wind direction and wind speed (short-term to permanent), snow and fruit load (mid-term to permanent), unbalanced growth or loss of crown parts (long-term to permanent). Vertical changes are a valuable measure to assess water status and static characteristics, such as mechanical stress-strain relationships and mechanical stability of trees. In order to disentangle the different causes (water status, mechanical stress), parallel measurements with three vertical dendrometers, oriented in three different cardinal directions are necessary.

Advantages

  • Assessment of mechanical stress-strain relationships
  • Suitable for large trees (diameter>8 cm)
  • Robust installation, resistant against wind, snow, falling branches and fruits

Limits

  • Trunk is injured by drilling (the damage can be minimized by tree resin)
  • Suitable only for larger trees (diameter>8 cm)

Delivery

  • Complete with 5 m cable

Options / Ordering Information

  • Cable extension (please specify in meters)
  • Installation tools (tree resin, hand drill)
  • Data Logger

Technical specifications

Name Vertical dendrometer (DV)
Suitable for tree size Diameter >8 cm
Range of the sensor 11 mm
Accuracy ±1.5 µm ± 0,12% (CR1000 Logger)
Resolution 0.2-2.6 µm (dependent on used data logger)
Linearity 1%
Thermal expansion coefficient of the sensor <0,1 µm/K
Thermal expansion coefficient of wire cable
Operating conditions -25 to 70 °C air temperature, 0 to 100% relative air humidity