Measuring device for single grass tree

A measuring device for a single grass tree, wherein the device is used to measure tree radial changes in multiple directions and tree sap flow rates at different radial depths in multiple directions;

• comprising:
• a first measuring rod, a second measuring rod group and a third measuring rod;
• wherein, the first measuring rod is connected to one end of the second measuring rod group, the third measuring rod is connected to the other end of the second measuring rod group, and the second measuring rod group comprises a plurality of second measuring rods which are sequentially connected;
• a plurality of probe sampling modules, and a plurality of main control modules which are in communication connection with one another;
• the first measuring rod, the second measuring rods and the third measuring rod are in one-to-one correspondence with the plurality of main control modules and the plurality of probe sampling modules;
• magnetic rotary encoders are arranged at one end of the first measuring rod and one end of each second measuring rod;
• each of the first measuring rod, the second measuring rod and the third measuring rod comprises a first telescopic rod and a second telescopic rod which are connected with one another;
• capacitive grating sensors are arranged on the first telescopic rod and the second telescopic rod;
• the probe sampling modules are arranged at connecting ends of the first telescopic rod and the second telescopic rod;
• the capacitive grating sensors are used to measure the lengths of the corresponding telescopic rods;
• and the probe sampling modules are used to acquire instantaneous voltage differences at different radial depths;
• the first measuring rod, the second measuring rod group and the third measuring rod which are connected in sequence can be arranged in the circumferential direction of a trunk of a single grass tree in a surrounding mode to form a measuring structure that can automatically extend and retract as the increase of the circumference of the trunk;
• the measuring structure is fixed to the trunk of the single grass tree by means of the probe sampling modules;
• the end, away from the second measuring rod group, of the first measuring rod and the end, away from the second measuring rod group, of the third measuring rod are both free ends;
• the main control modules acquire an included angle between the two connected measuring rods corresponding to the magnetic rotary encoders based on the output of magnetic rotary encoders on the corresponding measuring rod;
• the main control modules are further used to acquire the radius of the arbor tree at a set point position according to the lengths of two telescopic rods in the corresponding measuring rod and the included angle of the two ends of the measuring rods, and the set point position is a contact position of the connecting ends of the two telescopic rods in the corresponding measuring rod and the trunk;
• the main control modules are further used to acquire the tree sap flow rate corresponding to different radial depths according to instantaneous voltage differences generated by the probe sampling modules at different radial depths.