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Impedance type soil moisture sensor and making process thereof

A technology of soil moisture and production process, which is applied in the production process of impedance soil moisture sensor and the field of impedance soil moisture sensor, which can solve problems such as difficulty in adoption, large slope of the relationship curve between resistance and suction, and insufficient wide test range of the dry end. , to achieve the effect of a wide range of humidity measurement

Inactive Publication Date: 2006-02-08
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical application, there are the following deficiencies: ① the soil water suction measurement range is 0 ~ 85Kpa, although it is suitable for the irrigation guidance requirements of high-yield cultivation of many crops; The test range is not wide enough and the application is limited
②Because water needs to be added to the sensor at regular intervals, it is difficult to use for unattended stations
③The upper end of the sensor needs to be exposed to the ground surface, which adds trouble to management and protection
Therefore, for the same reason, when the suction is further increased, such as >300Kpa, the slope of the relationship curve between resistance and suction is too large, which also affects the widening of the dry end test range

Method used

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  • Impedance type soil moisture sensor and making process thereof
  • Impedance type soil moisture sensor and making process thereof
  • Impedance type soil moisture sensor and making process thereof

Examples

Experimental program
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Embodiment 1

[0041] Embodiment 1, with reference to figure 1 : Impedance type soil moisture sensor, two parallel stainless steel electrodes 1 are placed in the resistance block and lead out the cable 6, the resistance block is made of filling material 2 filled in clay head 3, the composition of the filling material is: Contains SiO 2Mainly sandy loam and gypsum powder are mixed at a ratio of about 3:2 as the base material, and at the same time, artificial structure modifiers are added to the base material. A PVC pipe 5 is glued on the clay head 3 with epoxy resin 4, and a temperature sensor 7 is installed in the pipe, and its lead wire 8 is used to correct the change of the conductance value caused by the temperature change.

[0042] Specifically, the composition and manufacturing process of each part are as follows:

[0043] The material composition of the sensor:

[0044] The ideal resistance block should be a porous body with relatively uniform distribution of fine and small pores. ...

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Abstract

The invention relates to a vibrate oil moisture sensor, wherein two electrodes are positioned inside the resistance block which is formed by the padding material of the argil; the padding material mixes the sandy loam soil which mainly comprises Sio2 and the gesso at the ratio 3:1.8-2.2, and adds artificial structure amendment. The padding material of the optimal plan adds macromole fixative; the sandy loam soil has PVC pipe; the temperature sensor is fixed inside the pipe to adjust the convening change aroused by changing the temperature. The artificial structure amendment adopts polyacrylamide with 0.1 solid weights; the macromole adopts 1 gram / liter polyacrylamide solution. It also provides a method for preparing the new type vibrate oil moisture sensor.

Description

technical field [0001] The invention relates to a soil instrument, in particular to an impedance type soil moisture sensor and a manufacturing process of the impedance type soil moisture sensor. Background technique [0002] At present, piezoresistive soil moisture sensors are mostly used for real-time monitoring and reporting of farmland moisture. It is based on tensiometer and combined with differential pressure sensor. This soil moisture sensor has high measurement accuracy and stability, easy calibration, and a moderate price. However, in practical application, there are the following deficiencies: ① the soil water suction measurement range is 0 ~ 85Kpa, although it is suitable for the irrigation guidance requirements of high-yield cultivation of many crops; The test range is not wide enough, and the application is limited. ② Since water needs to be added to the sensor at regular intervals, it is difficult to use it for unattended stations. ③The upper end of the sens...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 信秀丽徐富安徐梦熊
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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