Soil Moisture Sensing Using Oscillation Signal Intensity
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Solution Overview
Problem
Existing soil moisture detection devices, such as resistance type hygrometers and impedance conversion methods, suffer from poor measurement accuracy due to variations in ion number and current flow, leading to inconsistent humidity readings in soils with the same moisture content.
Innovation Solution
A soil moisture detection device utilizing a first and second pole, a capacitor, an inductor, and a waveform detection unit, where the oscillation signal is transmitted through the soil to measure changes in oscillation signal intensity, allowing the main control chip to calculate soil moisture data accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resistance type measurement method is used, then device complexity is reduced, but measurement precision deteriorates due to variations in ion concentration and current flow
Solution Approach 1:
The patent replaces the electrical resistance measurement method with an electromagnetic oscillation-based detection method. Instead of measuring resistance changes caused by ion concentration variations, the system uses an oscillation signal source to generate electromagnetic signals that pass through the soil, detecting moisture content through changes in signal intensity rather than electrical resistance.
Solution Approach 2:
The patent changes the detection parameter from electrical resistance to electromagnetic signal intensity. By using an oscillation signal source and waveform detection unit, the system measures changes in signal intensity (amplitude, frequency, or phase) rather than resistance values, thereby eliminating the influence of ion concentration variations on measurement accuracy.
2Ease of manufacture
If resistance type soil hygrometer is used, then ease of manufacture is improved, but reliability deteriorates due to inconsistent humidity readings in different soils
Solution Approach 1:
The patent replaces the simple resistance measurement circuit with an electromagnetic oscillation system. This substitution maintains manufacturing simplicity while significantly improving reliability, as the oscillation-based method is not affected by variations in soil ion concentration, electrode polarization, or contact resistance that plague traditional resistance-type measurements.
Solution Approach 2:
The patent introduces an oscillation signal as an intermediary to detect soil moisture. Instead of directly measuring resistance between electrodes, the system uses electromagnetic oscillation signals that propagate through the soil medium, with their intensity changes reflecting moisture content. This intermediary approach eliminates direct electrode-soil contact issues and provides consistent, reliable measurements.
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
Improves the accuracy and practicality of soil moisture detection by using separate poles to avoid electrical contact and adjust spacing, incorporating temperature and pH sensing, and employing a switching unit to minimize interference, enhancing detection stability and precision.
Implementation Method 1
an output end of the oscillation signal source is electrically connected to an end of the first resistor, an input end of the waveform detection unit, and the first pole through the first capacitor, the first inductor; the second pole is grounded
Data Source
AI summary
The present disclosure discloses a soil moisture detection device, a first pole and a second pole are set in soil, a power supply switch circuit is controlled through a main control chip, an external voltage is added to a signal oscillation source, voltage is converted into an oscillation signal by the signal oscillation source, oscillation signal reaches a first pole through a first capacitor and a first inductor. When the soil between the first pole and second pole is completely dry, the two are equivalent to an open circuit, and a waveform detection unit can collect strong oscillation signal corresponding to frequency. When the soil between the first pole and second pole is moist, the oscillation signal is transmitted from the first pole to the second pole through the moist soil, an intensity of the oscillation signal corresponding to the frequency collected by the waveform detection unit changes.