Resistance Sensor for Ice and Snow Phase Detection
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Solution Overview
Problem
Existing technologies lack effective methods for in-situ detection of ice, snow, and liquid water content on surfaces, particularly in critical applications like bridge cables, air conditioning coils, and wind turbines, which can lead to hazards and inefficiencies due to the inability to accurately differentiate between dry and wet snow states.
Innovation Solution
A resistance-based sensor system that combines electrical conductivity measurements with temperature data to differentiate between water, ice, and air, using a variable resistance circuit and data acquisition system to determine the presence and state of water on surfaces, including the liquid water content in wet snow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensors are used to detect ice or snow presence, then basic detection capability is provided, but the ability to differentiate between dry and wet snow states and measure liquid water content is insufficient
Solution Approach 1:
The patent combines multiple sensing functions into a single integrated sensor system that simultaneously measures electrical conductivity, temperature, and calculates liquid water content. This merging approach enables differentiation between dry snow, wet snow, ice, and liquid water using one device rather than multiple separate sensors, thereby improving measurement precision without proportionally increasing device complexity
Solution Approach 2:
The sensor system utilizes changes in electrical conductivity parameters across different media states (air, dry snow, wet snow, ice, liquid water) to distinguish between them. By measuring conductivity at different thresholds and combining with temperature data, the system achieves precise classification of snow and ice states, resolving the contradiction between detection precision and device complexity
2Reliability
If no detection system is installed, then device complexity is minimized, but safety hazards and operational inefficiencies occur due to inability to detect ice, snow, or water accumulation
Solution Approach 1:
The patent replaces complex mechanical detection systems with an electrical conductivity-based sensing approach. Instead of using mechanical sensors that physically contact and measure ice or snow, the system uses electrical field interactions to detect the presence and state of precipitation, thereby improving safety reliability while keeping the added system complexity relatively low
Solution Approach 2:
The sensor system acts as an intermediary between the environment (ice, snow, water accumulation) and the monitoring system. By measuring electrical conductivity changes caused by different media, the sensor provides reliable safety information without requiring direct mechanical interaction with hazardous materials, thus improving reliability while maintaining manageable system complexity
3Loss of information
If simple presence detection is used, then device complexity is low, but the ability to provide real-time liquid water content measurement and distinguish snow states is insufficient
Solution Approach 1:
The sensor system is designed with multi-functionality to perform various detection tasks simultaneously: detecting presence of precipitation, distinguishing between dry snow and wet snow states, measuring liquid water content, and identifying ice formation. This universal approach reduces information loss by providing comprehensive data from a single device, balancing information completeness with acceptable system complexity
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 sensor provides accurate, real-time detection of ice, snow, and liquid water content, enhancing safety and efficiency by distinguishing between dry and wet snow states, reducing the risk of hazards and improving system performance in various applications.
Implementation Method 1
The sensor is a resistance-based sensor that uses the change of the electrical conductivity of different media (i.e., water, ice, snow, and air)
Implementation Method 2
uses the change of the electrical conductivity of different media (i.e., water, ice, snow, and air) and the surface temperature at the same location
Data Source
AI summary
Sensor systems, sensors, and methods for detecting a presence and a phase of a medium on a surface are described. The sensor system has a power source providing a voltage; a sensing element in electrical communication with the power source, the sensing element including: two electrodes, wherein a gap is defined between the two electrodes, and a temperature measurement device disposed between the two electrodes; a fixed resistor in electrical communication with the power source and the sensing element; and a data acquisition system in electrical communication with the power source, the sensing element, and the fixed resistor. The sensor system measures the electrical resistance of the medium, and the temperature of the surface, and identifies the phase of the medium.