Non-plug-in water content sensor of culture substrate

Abstract

The invention discloses a non-plug-in water content sensor of a culture substrate. The non-plug-in water content sensor comprises a unilateral sensitive capacitive probe, a circuit mainboard with a capacitance measurement circuit, and an input/output interface cable, wherein the unilateral sensitive capacitive probe comprises a driving pole plate, induction pole plates, a shield pole plate and a substrate; the driving pole plate and the induction pole plates are positioned on the same surface of the substrate; the shield pole plate is positioned on the other surface of the substrate; and the induction pole plates and the shield pole plate are equipotential. The invention further discloses a calibration model of the sensor. A parameter beta in the calibration model is determined according to a water content output voltage signal of the sensor in a main substrate and a water content output voltage signal of the sensor in a given culture substrate at any point, and a calibration equation is determined sequentially. The sensor can obtain the water content of a surface layer of the culture substrate, and has the advantages of low cost, stable performance, simple input/output interface, convenience and simplicity in calibration, and the like; and the calibration model of the sensor and a two-point calibration model method based on the model have the characteristics of quickness and simplicity.

Description

technical field [0001] The present invention relates to a non-inserted water content sensor and its calibration method, in particular to a single-side sensitive non-inserted sensor used for detecting the water content of a cultivation substrate and a two-point calibration device for its calibration model and its calibration method . Background technique [0002] Soil moisture measurement is the basis for implementing water-saving irrigation in precision agriculture and a key link in realizing agricultural irrigation automation. With the application of wireless distributed soil moisture monitoring network system becoming more and more mature, there is an urgent need for a water content sensor with high measurement accuracy, low power consumption, low price, small structure and simple calibration process. In addition, in protected gardening, especially in bag culture, potted planting or column planting, the soilless culture substrate is loose, making it difficult for the trad...

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Problems solved by technology

These two calibration methods have shortcomings: Toshihiro Sakak's saturated wet soil is difficult to quantitatively prepare, and it is inconvenient to operate; the better model established by Gao Yan and Bogena in the second step of calibration is also different due to the different properties of soil and soilless cultivation substrate. not adaptable

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