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Paddy field moisture sensor

A sensor and moisture technology, applied in instruments, analytical materials, scientific instruments, etc., can solve problems such as the difficulty of reducing the cost of signal processing circuits

Active Publication Date: 2012-11-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of pure optical methods, the influence of soil type and soil particle size on the measurement results is reduced, and the sensitivity and accuracy of moisture testing are improved, but the complex optical system and its supporting signal processing circuits are difficult to reduce costs.

Method used

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] There are impurities in the water in the paddy field, both dielectric and conductive particles. The electrodes inserted into the water can be equivalent to an RC parallel circuit. When the difference in water quality is not significant, the resistivity and dielectric coefficient of water are constant. The resistance value of the equivalent resistance of the electrode is inversely proportional to the depth of the electrode in the water, and the capacity of the equivalent capacitance is proportional to the depth of the electrode in the water. Measuring the RC change of this electrode can measure the depth of the electrode in the water. If the lower end of the electrode is close to the soil, the height of the paddy field water layer can be measured.

[0023] Paddy field soil contains moisture and impurities, among which water has important dielectrics and...

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Abstract

The invention discloses a moisture sensor in paddy, comprising a case(3), a soil moisture probe(1) arranged on the bottom of the case(3), an aqueous layer probe(2) pasted on the two sides of the case(3), and a detection circuit(4) arranged inside the case(3), the detection circuit(4) emits a pulse square wave incentive signal to the soil moisture probe(1) and the aqueous layer probe(2), and receives the peak signal of the charging voltage of the two probes. The invention has precise detection, simple structure, and low cost.

Description

technical field [0001] The invention relates to the field of farmland information collection, in particular to a paddy field moisture sensor. Background technique [0002] The rice growth and maturity stages have different requirements for field water holding capacity. During the growth stage, the field should not be short of water, but the water layer should not be higher than the seedlings. During the maturity stage, the field should be drained and dried three times, but it should not be excessively dry. At present, these operations are decided by farmers based on experience. In the rice precision operation system, the decision-making of precision irrigation and drying requires a scientific measuring instrument to automatically monitor the field water holding capacity, mainly to monitor the water layer level and soil moisture content of the rice field. This requires the installation of paddy field moisture sensors in paddy fields. [0003] At present, the mature soil moi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G01N27/00G01F23/00
Inventor 罗锡文胡均万周志艳阮欢
Owner SOUTH CHINA AGRI UNIV
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