Biodegradable Capacitive Soil Moisture Sensor for Dense Field Deployment
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Solution Overview
Problem
Current agricultural practices face inefficiencies in water usage due to spatial and temporal variability in soil moisture, leading to over or under application of irrigation water, necessitating accurate and efficient systems for managing water usage.
Innovation Solution
A capacitive soil moisture sensor fabricated from biodegradable materials, featuring a capacitive circuit on a biodegradable substrate encased in a hydrophobic, biodegradable encapsulating material, designed to provide stable readings until degradation, allowing for high-density deployment and easy identification of sensor failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform irrigation rate is applied across the field, then large-scale farming efficiency is improved, but water use efficiency deteriorates due to spatial and temporal variability in soil moisture
Solution Approach 1:
The patent segments the field into multiple zones with different irrigation rates based on spatial variability in soil moisture, crop type, and other factors. This is achieved through variable rate irrigation technology that applies water at different rates to different segments of the field, thereby maintaining large-scale farming efficiency while improving water use efficiency in each specific zone.
Solution Approach 2:
The patent implements local quality by tailoring irrigation rates to specific local conditions within the field. Different areas receive customized irrigation treatments based on their unique soil moisture characteristics, crop requirements, and environmental factors, thus optimizing water use efficiency locally while maintaining overall farm productivity.
2Object-affected harmful factors
If biodegradable materials are used for sensor fabrication, then environmental impact is reduced, but sensor durability and reliability deteriorate
Solution Approach 1:
The patent employs parameter changes by carefully selecting and optimizing the properties of biodegradable materials to achieve the desired balance between environmental friendliness and sensor reliability. This includes controlling degradation rate, mechanical strength, and electrical properties of the biodegradable substrate and encapsulating materials through compositional adjustments and processing parameters.
Solution Approach 2:
The patent utilizes composite materials by combining biodegradable substrates with hydrophobic biodegradable encapsulating materials to create a sensor structure that maintains reliability during operation while ensuring environmental safety. The composite structure provides both the functional requirements for sensing and the desired biodegradation characteristics.
3Measurement precision
If sensors are deployed at high density, then measurement precision is improved, but cost and complexity of sensor retrieval and maintenance worsen
Solution Approach 1:
The patent implements disposable short-living objects by using biodegradable sensor materials that naturally degrade after a predetermined service life. This eliminates the need for complex retrieval operations and maintenance activities, as the sensors automatically decompose in the environment after completing their measurement function, thereby reducing the complexity and cost associated with managing high-density sensor deployments.
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
Enables precise soil moisture measurement for targeted irrigation, ensuring efficient water use by distinguishing functional and non-functional sensor states, eliminating the need for retrieval, and reducing maintenance costs.
Implementation Method 1
a capacitive circuit positioned on the biodegradable substrate
Implementation Method 2
a hydrophobic, biodegradable encapsulating material encasing at least the capacitive circuit
Data Source
AI summary
A capacitive soil moisture sensor for detecting moisture levels in soil comprises a biodegradable substrate. A capacitive circuit is positioned on the biodegradable substrate. An antenna circuit is configured to communicate capacitance data. A hydrophobic, biodegradable encapsulating material encases at least the capacitive circuit.