Ice Thickness Transducer Boundary Layer Interference
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Solution Overview
Problem
Existing ice thickness measurement technologies are prone to inaccuracies due to boundary layer effects and are often sensitive to environmental changes, requiring complex calibration and being susceptible to fouling, which limits their reliability and longevity in measuring actual ice thickness in open bodies of water.
Innovation Solution
An ice thickness transducer with a plurality of sensors at increasing depths that detect the presence of ice, using a flexible membrane and actuator assembly to differentiate between water and ice, providing a direct numeric measurement and visual display of ice thickness, while minimizing interference with the ice formation process and being insensitive to boundary layer conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ice thickness sensors are used, then ice thickness can be measured, but the measurements are inaccurate due to boundary layer effects and environmental sensitivity
Solution Approach 1:
The patent extracts the sensing function from the boundary layer environment by positioning sensors beyond the boundary layer, where they are not affected by thermal interactions with the transducer body. This separates the measurement function from the harmful thermal environment, enabling accurate ice thickness measurement without boundary layer interference.
Solution Approach 2:
The patent introduces thermal insulation as an intermediary between the transducer body and the sensors. This intermediary layer prevents thermal energy transfer from the transducer body to the sensors, eliminating the boundary layer effect that causes measurement inaccuracies while allowing the sensors to accurately detect ice thickness.
2Volume of moving object
If sensors are placed close to the transducer body for compact design, then device size is reduced, but boundary layer effects cause false readings
Solution Approach 1:
The sensors are extracted from the boundary layer zone by positioning them beyond the thermal boundary layer extent. This spatial separation removes the sensors from the harmful thermal environment created by the transducer body, allowing compact design without compromising measurement accuracy.
Solution Approach 2:
Thermal insulation acts as an intermediary that extends the effective sensing zone beyond the physical transducer body. This allows sensors to be positioned at optimal measurement locations while protecting them from boundary layer effects, maintaining both compactness and measurement precision.
3Duration of action of stationary object
If the transducer remains stationary for long-term monitoring, then continuous data is collected, but the sensor becomes susceptible to fouling and environmental changes
Solution Approach 1:
The patent employs sensors that detect changes in physical parameters (such as acoustic velocity or electromagnetic properties) that differ between water and ice. By monitoring parameter changes rather than relying on fixed threshold values, the system maintains reliability over long periods despite environmental variations and fouling.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor sensor responses and adjust measurements accordingly. This feedback allows the transducer to compensate for gradual fouling and environmental changes, maintaining reliable long-term monitoring capability without requiring frequent maintenance or calibration.
4Productivity
If mathematical models are used to predict ice thickness, then general trends can be estimated, but local variations are not captured
Solution Approach 1:
The patent replaces mathematical modeling with direct physical measurement using sensors that detect actual ice thickness at specific locations. This substitution of mechanical/physical sensing for computational estimation provides accurate local measurements while maintaining efficient operation, eliminating the need for complex calculations and calibration.
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 enables accurate, long-term, and unattended ice thickness measurement, reducing the risk of false readings and maintaining operational reliability despite environmental changes, with minimal impact on ice formation and low power consumption.
Implementation Method 1
A plurality of ice presence sensors are provided on the ice thickness transducer, each which determine if water or ice is present at a corresponding depth
Data Source
AI summary
A transducer for measuring the thickness of ice in a body of water includes a transducer body, at least one ice presence sensor for measuring the presence of ice at a point beyond a boundary layer between the transducer body and the body of water, a flotation element, a controller, and a display assembly. The transducer body includes waterproof membrane sealed orifices positioned on the transducer body for one or more ice presence sensors. A tether point attaches an anchor to keep the transducer at a fixed location in the water body. The ice presence sensor includes a sense probe passing through the waterproof membrane, a sense probe seal, a drive rod, a switch, and an actuator. The display includes one or more visible elements to indicate ice thickness at the transducer location. The ice thickness is inferred by the collective indications at the one or more ice presence sensors.