Composite sensor for measuring soil moisture characteristic curve

A composite sensor and characteristic curve technology, applied in the field of sensor measurement, can solve the problems of cumbersome measurement procedures, time-consuming and labor-intensive, etc., and achieve the effects of objective and accurate measurement results and simple measurement procedures.

Inactive Publication Date: 2009-01-07
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a composite sensor that simultaneously measures soil moisture content and soil m

Method used

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  • Composite sensor for measuring soil moisture characteristic curve
  • Composite sensor for measuring soil moisture characteristic curve
  • Composite sensor for measuring soil moisture characteristic curve

Examples

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Embodiment Construction

[0030] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] figure 1 It is the external structure diagram of the sensing unit of the composite sensor of the present invention. The sensing unit mainly includes a composite probe 5 and a plastic headgear 2, both of which are connected together by a special glass tube 3, and the special glass tube 3 and the composite probe 5 are connected in a threaded manner. The special glass tube 3 and the plastic headgear 2 are fixed and seamlessly connected to ensure the airtightness of the overall structure. The special glass tube 3 adopts special glass material to keep the internal visibility, which is beneficial to the experimental operation. like figure 2 As shown, a hollow circular tube 8 (shown by a dotted line in the figure) is set in the composite probe 5, and the inside of the hollow circular tube 8 and the special glass tube 3 is injected w...

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Abstract

The invention relates to a composite sensor which is used for measuring the characteristic curve of soil moisture. The composite sensor comprises a sensing unit and a signal processing circuit; the sensing unit consists of a sheathed casing, a porous cup and a pressure sensing element. The sheathed casing is used for transforming the changes of the soil moisture into the change signals of self impedance; the porous cup is closely connected with one end of the sheathed casing and provided with a built-in hollow cylinder; deionized water in the hollow cylinder overflows through the porous cup; the pressure sensing element is arranged at the other end of the sheathed casing and can be used for sensing the change of internal pressure of the hollow cylinder; the signal processing circuit is used for detecting the change signals of self impedance and the pressure changes, and acquiring the signals of soil moisture content and the signals of soil matrix potential, so as to output the characteristic curve of soil moisture.

Description

technical field [0001] The invention relates to a device for measuring soil moisture content and soil matric potential, in particular to a composite sensor for measuring soil moisture characteristic curve based on the principle of a traditional tensiometer and a single electrode structure, belonging to the field of sensor measurement. Background technique [0002] Soil is an important part of the natural ecological environment and is closely related to human life and production activities. As a porous medium, soil is composed of three phases: solid, liquid, and gas. Minerals and organic matter constitute its solid phase structure, and water and air fill the pores in the structure. In the three-phase composition of soil, soil water is the most active factor and an important link in the natural water cycle. [0003] In agricultural production activities, soil water is an important guarantee for plant survival. It not only affects the effective use of fertilizers by crops, but...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N13/02
Inventor 孙宇瑞任淑娟任图生
Owner CHINA AGRI UNIV
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