Water Detection Using RF Signal Quality Analysis
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Solution Overview
Problem
Existing water-detection methods in devices, such as lighting systems, often require complex hardware and dedicated humidity sensors, which can be cumbersome and inefficient for detecting water ingress or condensation.
Innovation Solution
A water-detection device that utilizes radio-frequency wireless communication signals to determine signal-quality values, comparing them to baseline values to infer water presence, eliminating the need for dedicated humidity sensors by analyzing signal strength, channel state, or other metrics within a predetermined tolerance range and time span.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated humidity sensors are used for water detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The wireless communication system performs dual functions: standard data transmission and water detection. The receiver unit analyzes signal quality metrics (RSSI, CSI) from wireless signals to detect water presence in the signal propagation path, eliminating the need for dedicated humidity sensors while maintaining detection capability.
Solution Approach 2:
The system uses its own wireless communication signals for self-diagnosis of water ingress. By monitoring changes in signal quality caused by water's dielectric properties, the system detects environmental conditions that affect its operation without requiring external sensing infrastructure.
2Device complexity
If existing wireless communication signals are used for water detection, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The system continuously monitors signal quality metrics and compares them against baseline values stored in memory. When signal quality deviates beyond a threshold, the system triggers water detection alerts, providing continuous feedback-based monitoring that compensates for the lack of dedicated sensing hardware.
Solution Approach 2:
The system detects water by monitoring changes in radio frequency signal parameters (signal strength, channel state) caused by water's dielectric properties. These parameter changes in the wireless signals serve as indirect but sufficient indicators of water presence, maintaining detection precision without additional hardware.
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 approach simplifies water detection by using existing wireless communication infrastructure, reducing hardware complexity and effectively identifying water ingress or condensation without dedicated sensors, while minimizing false positives through tailored tolerance ranges and frequency analysis.
Implementation Method 1
a receiver unit for receiving radio-frequency wireless communication signals from at least one external emitter unit
Implementation Method 2
The signal-quality value is a value that is correlated to an amount of water present in a signal-propagation path between the emitter unit and the receiver unit
Data Source
AI summary
The invention is directed to a water-detection device (100) for detecting a change in an amount of water (W) with respect to a baseline-condition. The water-detection device is configured to compare signal-quality values to baseline-values. The signal-quality values are indicative of a signal-quality metric that is correlated to the amount of water present in a signal-propagation path (S). The baseline-values are indicative of the signal-quality value obtained from the radio-frequency wireless communication signal at the baseline-condition. The water-detection device is configured to provide a water-detected signal (WD) indicative of a possible change of the amount water in the respective signal-propagation path upon determining that respective signal-quality value has been outside a tolerance-range of the baseline-value for a predetermined amount span, without the need of any dedicated water sensor.