Wind Turbine Blade Icing Detection via Electromagnetic Resonance
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Solution Overview
Problem
Existing ice detection methods for wind turbine blades are either unreliable due to indirect measurement techniques or have bulky sensors that are not directly integrated onto the blades, leading to inefficient detection and increased production stoppages in cold climates.
Innovation Solution
A device comprising a passive electromagnetic sensor with a receiving and emitting antenna, a frequency doubling device, and an interrogator that emits and receives polarized waves, allowing for direct detection of icing and deicing by measuring power thresholds, which is integrated onto the blade and operates on electrical permittivity measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If indirect measurement techniques are used for ice detection, then the detection can be implemented without direct blade sensors, but the reliability and precision of detection deteriorates
Solution Approach 1:
The patent introduces an electromagnetic tag as an intermediary sensor element that is directly integrated onto the blade. This tag contains a resonant circuit that interacts with electromagnetic fields, serving as a mediator between the blade surface and the detection system. The tag's resonant frequency changes in response to ice formation, providing reliable direct detection while maintaining ease of implementation through wireless interrogation.
2Ease of manufacture
If bulky sensors are disposed at meteorological masts or on nacelles, then the sensor size is reduced for integration, but the detection precision and directness deteriorates
Solution Approach 1:
The patent embeds the sensor functionality within a compact electromagnetic tag structure that is nested onto the blade surface. The tag contains a resonant circuit integrated into a small form factor, allowing it to be directly mounted on the blade without requiring bulky external sensors. This nested structure maintains detection precision by placing the sensor in direct contact with the blade surface while enabling easy integration.
3Reliability
If resonant circuits are configured to resonate at fundamental and dual frequencies, then the ability to distinguish blade reflections from ice detection signals improves, but the device complexity increases
Solution Approach 1:
The patent utilizes periodic frequency modulation by illuminating the resonant circuit at both fundamental and dual frequencies. This periodic action at different frequency levels creates distinct resonant responses that can be easily distinguished from blade reflections. The interrogator system sends electromagnetic signals at these periodic frequency intervals, and the resonant circuit responds with characteristic frequency shifts that indicate ice formation, providing reliable signal discrimination through frequency-based temporal patterns.
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 provides a low-cost, reliable, and energy-efficient method for detecting icing and deicing directly on wind turbine blades, improving signal-to-noise ratio, reducing the risk of false alarms, and enabling immediate production restarts by distinguishing between ice, water, and air based on power threshold measurements.
Implementation Method 1
operates on electrical permittivity measurement
Implementation Method 2
The described circuits are configured to resonate both at a fundamental frequency and at a dual frequency of this fundamental frequency
Implementation Method 3
an interrogator configured to emit an electromagnetic wave towards the receiving antenna of said sensor
Data Source
AI summary
The invention relates to a device for detecting icing and de-icing of a wind turbine blade, characterized in that it comprises: a sensor, placed on the surface of a blade, and comprising a first so-called “receiving” antenna, a second so-called “emitting” antenna, and a frequency divider inserted between said first and second antennas; and an interrogator, configured to emit an electromagnetic wave towards the receiving antenna of said sensor, and to receive an electromagnetic wave from the emitting antenna of said sensor.