Heater Element Ice Detection and Deicing via Resistance Monitoring
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Solution Overview
Problem
Conventional ice detection methods on aircraft are inefficient and may lead to false negatives or require intrusive sensors, posing risks to safe flight operations due to their reliance on mass changes or optical refractive index measurements.
Innovation Solution
A system utilizing temperature-dependent resistance heater elements coated on aircraft surfaces, where a sensing current is driven to monitor resistance changes, determining icing by analyzing the rate of resistance change and temperature, allowing for self-regulating de-icing arrays that can detect and remove ice without intrusive probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ice detection methods use intrusive sensors to monitor mass changes or optical refractive index, then detection capability is provided, but aerodynamic integrity is compromised and device complexity increases
Solution Approach 1:
The patent combines the de-icing heater function with the ice detection function into a single integrated system. The heater element serves dual purposes: preventing ice accumulation and detecting ice presence through resistance measurements, eliminating the need for separate intrusive detection sensors that would compromise aerodynamics.
Solution Approach 2:
The heater element is designed to perform multiple functions simultaneously - it acts as both a thermal de-icing device and an ice detection sensor. By monitoring the electrical resistance of the heater element, the system can detect ice accumulation without requiring dedicated detection hardware that would interfere with aerodynamic flow.
2Reliability
If conventional ice detection methods use intrusive sensors in the airstream, then ice buildup can be detected, but device complexity and potential for false negatives increase
Solution Approach 1:
The detection functionality is merged into the existing heater element structure. The heater's electrical resistance serves as the detection mechanism, eliminating the need for separate mass-change sensors or optical transducers, thereby reducing system complexity while maintaining detection reliability.
Solution Approach 2:
The heater element monitors its own state by measuring its electrical resistance. When ice accumulates on the heater, it alters the resistance, providing direct feedback about ice presence. This self-monitoring capability eliminates the need for external detection systems and reduces overall device complexity.
3Reliability
If de-icing systems continuously activate heaters under adverse weather conditions, then ice accumulation is prevented, but energy consumption increases
Solution Approach 1:
The system uses periodic resistance measurements of the heater element to monitor ice accumulation rather than continuous operation. The heater is activated only when ice detection is confirmed through resistance changes, converting continuous de-icing operation into periodic activation based on actual ice presence, thereby reducing overall energy consumption.
Solution Approach 2:
The system implements feedback control by continuously monitoring the heater element's electrical resistance and using this information to control heater activation. When resistance indicates ice presence, the heater is activated; when resistance returns to normal, activation stops. This feedback mechanism prevents unnecessary energy consumption while maintaining effective de-icing.
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
This method provides a non-intrusive, efficient, and reliable ice detection and de-icing solution that reduces the risk of false negatives and maintains aerodynamic integrity by using temperature-dependent resistance changes to detect ice and power self-regulating de-icing arrays.
Implementation Method 1
a heater element having a resistance that is temperature dependent
Implementation Method 2
driving a sensing current through a heater element
Implementation Method 3
A melting current is driven through the heater element when it is determined that there is icing at the heater element
Data Source
AI summary
A method for deicing an aerostructure includes driving a sensing current through a heater element coated to an aerostructure, the heater element having a resistance that is temperature dependent. A resistance of the heater element is monitored. It is determined whether there is icing at the heater element using the monitored resistance of the heater element. A melting current is driven through the heater element when it is determined that there is icing at the heater element.