Weighing steam infiltration meter

Abstract

The invention relates to a weighing steam infiltration meter, which is used for monitoring and testing the transpiration and leakage of water in soil. The weighing steams infiltration meter disclosed by the invention comprises an internal barrel made of metal material and an outer barrel arranged outside the internal barrel. A thermal insulation material is arranged in the outer barrel, and the soil of which the quality is the same as that of the soil to be monitored is filled in the internal barrel. A water-proof edge is arranged between the upper surface of the soil and the upper edge of the internal barrel. A water sensor, a temperature sensor and a thermal flux sensor are respectively arranged in the soil put in the internal barrel. The test signal output wires of the sensors are connected with a signal collection controller which is arranged outside the outer barrel. Three compressive springs which are used for supporting the internal barrel and the fixed weights of the soil in the internal barrel, and a pressure sensor which is used for testing the variable quantities of the internal barrel and the fixed weights of the soil in the internal barrel. The weighing steam infiltration meter disclosed by the invention can test the differences among the water, the temperature and the thermal flux of the soil in the monitoring position in real time, and can be used for quantitatively analyzing the differences, so that the test of the overall system is typical.

Description

technical field [0001] The invention relates to a device for monitoring evapotranspiration and leakage of farmland soil water, in particular to a weighing type lysimeter. Background technique [0002] Cropland evapotranspiration is an important part of the surface water balance, and has great significance in regional and global water balance. Accurate determination of farmland evapotranspiration is one of the prerequisites for effective use of surface water resources. Lysimeter (Lysimeter) is an instrument developed according to the principle of surface water balance. As a device for directly measuring farmland evapotranspiration, it is currently widely used at home and abroad. [0003] Lysimeter is an instrument designed according to the principle of water balance to measure water evapotranspiration in farmland. It can be divided into weighing type and non-weighing type. See: Zhu Zixi. Research on American Agricultural Meteorology and Farmland Evapotranspiration [J]. Mete...

AI Technical Summary

Problems solved by technology

[0004] Due to the heavy weight of the lysimeter, if direct measurement is used, even a high-precision sensor still cannot achieve the measurement accuracy

There are many ways to balance and offset the fixed weight part of the lysimeter, which means "dead" load, such as: mechanical lever principle, moving pulley principle, hydraulic principle, etc., but the manufacturing process is complicated, which is not conducive to maintenance after completion. In addition, the cost is high , and some even account for more than 50% of the entire equipment cost

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