Temperature-Compensated Conductance Sensor for Crop Moisture
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Solution Overview
Problem
Existing crop moisture measurement systems in agricultural working machines face challenges with reliability and cost-effectiveness, particularly due to interference from machine and crop variables, and require optimal positioning that can change with crop type and moisture content.
Innovation Solution
A conductance sensor system with temperature compensation, positioned inside the ejection chute and integrated with a post-accelerator, uses a triangular arrangement of electrodes for accurate moisture content determination, accounting for crop-specific and machine-specific parameters like throughput, layer height, density, and contact pressure, and allows for rotation to extend service life and reduce maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave sensors are used to detect crop parameters, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex microwave sensors with a simple conductance sensor system. Instead of using electromagnetic waves requiring sophisticated signal processing, the invention uses electrical conductance measurement through contact electrodes to determine crop moisture content. This substitution dramatically reduces device complexity while maintaining measurement capability through temperature-compensated conductance detection.
Solution Approach 2:
The conductance sensor system uses simple, inexpensive electrodes that can be easily replaced if needed, unlike expensive microwave sensors. The sensor design prioritizes cost-effectiveness and simplicity, accepting that the sensor may need periodic replacement rather than investing in expensive, complex equipment with longer service life.
2Duration of action of stationary object
If conductance sensors are positioned away from the crop flow impact area, then sensor durability is improved, but measurement precision deteriorates due to reduced contact
Solution Approach 1:
The patent changes the measurement parameter from simple conductance to temperature-compensated conductance. By measuring both conductance and temperature simultaneously and applying compensation algorithms, the system achieves accurate moisture detection even with varying contact conditions. This allows the sensor to be positioned in the crop impact area where contact is maximized, without sacrificing measurement precision.
Solution Approach 2:
The system incorporates temperature measurement as a feedback parameter to compensate for its influence on conductance readings. The temperature sensor provides real-time data that is used to correct the conductance measurements, ensuring accurate moisture detection regardless of contact pressure variations or position in the crop flow.
3Measurement precision
If temperature compensation is implemented, then measurement precision under varying conditions is improved, but device complexity increases
Solution Approach 1:
The patent combines the conductance sensor and temperature sensor into an integrated measurement system. Both sensors share the same measurement chamber and data processing circuitry, allowing simultaneous measurement of conductance and temperature. This merging approach minimizes additional complexity while enabling temperature-compensated moisture detection through coordinated sensing and processing.
4Measurement precision
If the conductance sensor is positioned to maximize crop contact, then measurement precision is improved, but sensor wear increases
Solution Approach 1:
By implementing temperature compensation, the system becomes less sensitive to variations in contact pressure and sensor wear. The temperature parameter provides additional information that allows accurate moisture detection even when contact conditions change over time due to wear, effectively decoupling measurement precision from sensor condition.
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 system provides reliable and precise crop moisture measurements under fluctuating conditions, reducing maintenance costs and ensuring consistent performance across varying crop types and machine operations.
Implementation Method 1
uses a conductance sensor system with temperature compensation, positioned inside the ejection chute... for accurate moisture content determination
Implementation Method 2
A conductance sensor system with temperature compensation... provides reliable and precise crop moisture measurements under fluctuating conditions
Data Source
AI summary
The invention relates to a measuring device (23) for measuring the constituents of a harvested crop (4, 5), wherein the measuring device (23) is attached to an agricultural machine (1, 2) and comprises at least one conductivity sensor (25), and wherein the at least one conductivity sensor (25) determines the constituent crop moisture (40), and wherein the crop moisture (40) is determined by temperature-compensated detection of the conductivity (CV). In this way, it is ensured that the measuring device (23) for determining the constituents of a harvested crop (4, 5) delivers reliable measurement results even under fluctuating measurement conditions.