system function

The thermal diffusion based plant stem flow monitoring system is designed using the principle of thermal diffusion measurement.2The needle type consists of two probes, with the upper probe equipped with a heater that uses constant power heating. Measure the temperature difference between the upper and lower probes using a thermocouple. Using the principle of thermal diffusion and empirical coefficients to calculate the sap flow rate of plant stems, reflecting transpiration and water consumption.

application area

Mainly used in the study of sap flow in forestry trees, reflecting the transpiration and water consumption of trees. For transpiration/The evapotranspiration model provides measured data. It can also be used to invert canopy stomatal conductance. In addition, regional expansion can be conducted based on observation data to study the distribution and utilization of water resources in the region.

System Characteristics

u usethermal diffusionDesign, can be used directlythermal diffusionRecommended calculation formulas for data analysis and processing;

u Easy system installation and simple software and hardware operation;

u TDPprobe diameter1.2mmInserting into the tree has minimal impact on the tree;

u systembeltLCDlcd,Storage interval1s~60minarbitrarily;

u Multiple sensors can be selected as needed, and this system can support up to48individualTDPSensors;

u provideUSBperhapsRS232Two interface modes, supportingGPRSVarious wireless network communication functions.

system composition

The system consists of a data collectorTDPComposed of probes, adjustable voltage regulators, insulation and radiation protection systems, protective enclosures, AC power supply systems, other installation accessories, and operating software systems. OptionalGPRSWireless transmission and solar power supply system, etc.

system parameter

u Data storage:2MStorage space for long-term preservation of data;

u System power supply:12V/12AHBattery, AC to DC charger;

u Work environment:-40~80℃0~100%RH(No condensation).

Sensor parameters