Soil moisture content measuring system and measuring method using the same

Abstract

The invention relates to a soil moisture content measuring system and a measuring method using the same. The system is characterized by including the following devices: a duct, a sensor, a guide rail and a processor. The guide rail is mounted on the inner side wall of the duct, the sensor is arranged on the guide rail, and the processor is connected to the sensor and is used for receiving the data collected by the sensor and analyzing the data. The soil moisture content measuring system provided by the invention has the advantages of simple design, high precision, strong stability, time and labor saving, and certain portability, is suitable for real-time measurement of soil moisture content under indoor and field conditions.

Description

technical field [0001] The invention relates to the technical field of soil moisture content measurement, in particular to a soil moisture content measurement system and a measurement method using the same. Background technique [0002] Soil moisture content plays an important role in the research and practice of plant growth, farmland irrigation, ecological environment and land management in arid areas. Especially in the construction of production and construction, agriculture, water conservancy and other projects, a simple and rapid method for measuring soil moisture content is of great significance for understanding and simulating the above process. [0003] At present, the widely used soil moisture content measurement methods include: gravimetric method, neutron method, frequency domain reflectometry (FDR), time domain reflectometry (TDR) and microwave technology. The gravimetric method is an internationally recognized standard method. The soil sample is placed in an ov...

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Problems solved by technology

The gravimetric method is an internationally recognized standard method. The soil sample is placed in an oven at 105°C and dried continuously for 16-24 hours. The measurement result is accurate, but it takes a long time and is destructive to the soil, and it is not suitable for long-term fixed-point continuous monitoring. The neutron method overcomes some shortcomings of the drying method, and can meet the requirements of continuous measurement of soil moisture content in a certain area and depth in the field, and is not affected by ambient temperature and pressure. Soil measurement; TDR and FDR have high measurement accuracy, no radioactivity, and are suitable for long-term fixed-point observation, but the moisture content measured by TDR is the average soil moisture content of the entire probe length, so in a certain soil area, different embedding The method will lead to differences in the measurement results. FDR has high requirements for the installation of the conduit during use. There should be no gap between the soil and the outer wall of the conduit, because the gap will affect the accuracy of the measurement result.

Moreover, the above soil moisture content measurement technology can only measure the average moisture content of a certain volume or a certain depth of soil, and the spatial resolution is low.

The near-infrared reflection method can realize the quantitative measurement of material composition, and the measurement speed is fast, non-contact, and highly repeatable. It has been widely used in the measurement of soil parameters. However, the commercial spectrometer is complex in structure and expensive, and is not suitable for real-time monitoring in the field. Soil moisture content, the improved near-infrared soil moisture content meter, due to the use of optical devices such as filters, integrating spheres and lenses, although the volume is greatly reduced compared to the spectrometer, the overall energy consumption of the instrument is not suitable for portable instruments usage of

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