Soil Sensor Layout Using GND Shielding for Dual Water Measurement
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Solution Overview
Problem
Existing soil sensors face challenges in simultaneously measuring water content and water potential without causing mutual interference between detection units.
Innovation Solution
The soil sensor design includes a first detection unit for water content and a second detection unit for water potential, with the first GND line spaced from the first signal line to minimize electric field interference, allowing both units to be arranged without unnecessary capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the first detection unit and second detection unit are arranged close to each other on the base, then the device structure is compact, but mutual interference between detection units increases due to electric field overlap
Solution Approach 1:
A ground line (GND) is introduced as an intermediary element between the first signal line and the second detection unit. This ground line acts as a shield that redirects electric field lines, preventing them from reaching the second detection unit and causing interference. The ground line serves as a mediator that manages the electric field distribution in the confined space.
Solution Approach 2:
The ground line is positioned at a different spatial level or orientation relative to the signal lines, creating a three-dimensional electric field management structure. By utilizing vertical spacing and angular arrangement, the patent effectively increases the separation distance in the third dimension while maintaining a compact two-dimensional footprint.
2Area of stationary object
If the first signal line and first GND line are arranged close together, then the wiring space is efficient, but electric field interference increases
Solution Approach 1:
The ground line is designed to maintain an equipotential surface between the signal lines, creating a region of uniform electric potential. This equipotential ground line redirects electric field lines parallel to itself, preventing them from crossing between signal lines and causing interference, while allowing compact wiring arrangement.
3Area of stationary object
If the second detection unit is placed within the region surrounded by the first GND line, then the base area is minimized, but capacitance coupling between units increases
Solution Approach 1:
The first ground line serves as a shielding intermediary that the second detection unit is strategically positioned within. This ground line intercepts and redirects electric field lines from the first signal line, creating a protected zone where the second detection unit can operate with minimal capacitance coupling interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces mutual influence between detection units, enabling accurate measurement of both water content and water potential in soil.
Implementation Method 1
The circuit unit measures a water content of the soil based on a frequency signal which is inputted between the one end portion of the first signal line and the one end portion of the first GND line
Implementation Method 2
The circuit unit measures a water potential of the soil based on capacitance between the one end portion of the second signal line and the one end portion of the second GND line, the capacitance being changed by water contained in the soil entering the ceramic body
Data Source
AI summary
A soil sensor includes a base, a first detection unit, a second detection unit, and a circuit unit. A first signal line of the first detection unit has a circular wiring pattern when being projected to an installation surface of the base. A first GND line of the first detection unit is arranged to be spaced from the first signal line and has a wiring pattern, when being projected to the installation surface, located within a region surrounded by the wiring pattern of the first signal line projected on the installation surface. The second detection unit is located within a region surrounded by the wiring pattern of the first GND line projected on the installation surface of the base.