Capacitive Soil Moisture Sensor with Stacked Electrodes for Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacitive soil hygrometers are limited by their structure size, which affects detection accuracy and prevents the detection of small changes in soil moisture.
Innovation Solution
A capacitive soil moisture detection device with a substrate featuring at least two electrode pieces facing each other, coated with a substrate material, and connected to a main control chip, forming a larger capacitance structure that sensitively responds to humidity changes, enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional U-shaped and I-shaped electrode structure is used, then the device structure is simple and easy to manufacture, but the capacitance structure size is limited which reduces measurement precision
Solution Approach 1:
The patent transitions from a planar 2D electrode layout to a 3D multi-layer stacked configuration. Multiple electrode pieces are arranged in different layers with alternating polarity, creating a three-dimensional capacitive structure that significantly increases the effective capacitance area without increasing the device's external footprint, thereby improving measurement precision while maintaining compact dimensions.
Solution Approach 2:
The patent implements a nested multi-layer structure where electrode pieces are stacked within a compact substrate. The first and second electrode pieces are positioned in different layers, with insulating layers nested between them, creating a space-efficient capacitive structure that maximizes capacitance within a limited volume, effectively resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the capacitance structure size is increased to improve detection accuracy, then small changes in soil moisture can be detected, but the device structure becomes more complex
Solution Approach 1:
The patent utilizes vertical stacking in the third dimension to increase capacitance structure size. By arranging multiple electrode pieces in alternating layers separated by insulating materials, the effective capacitance area is expanded without proportionally increasing the device's horizontal footprint, thus improving detection accuracy while controlling structural complexity.
Solution Approach 2:
The patent employs thin insulating films and flexible substrate materials to create a compact multi-layer capacitive structure. These thin films enable the stacking of multiple electrode layers within a minimal thickness, increasing the capacitance structure size and measurement precision while maintaining a simple overall device form factor.
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
The solution improves measurement accuracy and enables precise control of environmental soil moisture by detecting small changes through a larger capacitance structure.
Implementation Method 1
the capacitance type soil hygrometers convent capacitance changes as a change of a capacitor in a substrate caused by humidity changes of the soil into a corresponding electrical signal to achieve the moisture detection of the soil
Implementation Method 2
each electrode piece is coated with a substrate material; a capacitance is formed between the two. The capacitance between the two is changed by the humidity change of the soil
Data Source
AI summary
The present disclosure discloses a soil moisture detection device and system. By providing with an outer shell and providing with a circuit board and a main control chip in the outer shell, an end of a substrate is clamp connection to the outer shell, an inner of the substrate is provided with at least two electrode pieces. Two electrode pieces are facing to each other and have a gap between herein. At the same time, each electrode piece is coated with a substrate material to form a capacitive structure, which can have a larger capacitance, according to a humidity change of the soil, it can generate a corresponding capacitance change more sensitively, thereby improving a measurement accuracy and benefiting to achieve a more precise control of environmental soil moisture.