| Electronic and intelligent agriculture is the important direction of agricultural development in our country, the electrical resistance tomography technology was applied to tuber nondestructive testing in the field for agriculture is a new research subject, has extensive research application prospect and practical value.The electrical resistance tomography (ERT) system will be produced in the research of imaging monitoring the growth status of tubers in subsoil, and it will provide powerful visualization monitor method and analysis tool for the new variety breeding, scientific and reasonable planting, and yield improvement of tuberous plants, such as potato, sweet potato, taro, and the precious medicine such as ginseng and gastrodia elata. For the fine planting of the tuberous plants, by using the sampling inspection of the tuber growth status in the fields, and even by using the remote monitoring and control through the wireless sensor networks, the watering, fertilizing and plant diseases prevention can be reasonable and effective implemented. It does great significance to the low-carbon economy, the green environmental protection and food security.Research tuber electrical resistance tomography (TERT) under the condition of soil environment on the basis of electrical resistance tomography, analyzes influence on system the array of electrode shape and electrode material; discuss the choice of incentive/measurement signal under the two model of the adjacent and relative incentives system. These provide theoretical basis for further studies and TERT system hardware structures.Through the study of soil conductivity properties of multiphase medium environment and potato tuber growth conditions, use S230instrument made by the American METTLED TOLEDO company to measure the conductivity of tuber and soil, established the mathematical model of the soil electrical conductivity with soil water content, which provides a guiding role for the forward problem simulation parameter setting and sensitive field impedance model.The forward problem of TERT system was completed using COMSOL software. Established the model of soil, under different condition of object field analyzed electric characteristics distribution of sensitive field, such as moisture content, with or without tubers, tuber growth stage and tuber number and so on.Achieve soil resistance of sensitive field according to above results, research the measure impedance model constituting with the subsoil multiphase medium environment and the multi-plane array sensors of electrical resistance tomography and current incentive, analysis the frequency characteristics of input/output.Innovation and contribution of this paper is the soil conductivity test and research of multiphase medium environment and tuber, under the condition of the potato tuber growth well, the mathematical model of the relation between soil electrical conductivity and soil water content is established, this provides an important theoretical guidance for the design of hardware circuit and the algorithm of subsequent. |
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