Microstrip Differential Trace Moisture Sensors for Liquid-Cooled Systems
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Solution Overview
Problem
Information handling systems with liquid cooling subsystems face challenges in detecting coolant leaks, which can lead to corrosion and damage due to water ingress from leaks caused by vibration, thermal cycles, or aging, necessitating an effective and reliable leak detection method.
Innovation Solution
The implementation of a digital leak detection apparatus using microstrip differential trace moisture sensors driven by a resistance-capacitance low-pass filter and digital signal processing (DSP) to differentiate between humidity and actual coolant leaks, with exposed gold-plated traces connected to a microcontroller unit (MCU) for alert generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional leak detection methods are used, then simplicity is maintained, but reliability of leak detection deteriorates due to inability to distinguish between humidity and actual leaks
Solution Approach 1:
The detection system is segmented into multiple independent microstrip differential trace sensors positioned at different locations on the circuit board. Each sensor independently monitors moisture levels in its specific zone, allowing the system to detect leaks with high reliability while maintaining modular simplicity in each individual sensor design.
Solution Approach 2:
The patent replaces traditional mechanical or electrical leak detection mechanisms with a field-based approach using microstrip differential traces that detect changes in electromagnetic field properties caused by moisture. This substitution enables reliable leak detection through non-contact electromagnetic sensing, improving reliability while keeping the device structure simple.
2Measurement precision
If microstrip differential trace sensors are used, then measurement precision of moisture detection is improved, but device complexity increases due to additional circuit components
Solution Approach 1:
The microstrip differential trace sensors are merged directly into the existing circuit board layout, combining the sensing function with the structural substrate. This integration approach enables precise moisture detection through the circuit board itself, improving measurement precision while avoiding additional separate sensor components and reducing overall device complexity.
Solution Approach 2:
The microstrip differential traces serve multiple functions: they act as both structural elements of the circuit board and as sensitive moisture detection sensors. This multi-functionality allows the same structure to provide both mechanical support and precise moisture measurement, eliminating the need for separate sensing components and reducing device complexity.
3Reliability
If digital signal processing is implemented, then reliability of leak identification is improved by distinguishing humidity from leaks, but loss of processing time increases
Solution Approach 1:
The system performs preliminary calibration and baseline establishment during manufacturing or initial operation, storing reference values for normal humidity conditions. During actual operation, the digital signal processing only needs to compare real-time sensor readings against these pre-established baselines, enabling rapid leak identification with high reliability without extensive real-time processing.
Solution Approach 2:
The digital signal processing algorithm is designed to automatically distinguish between humidity variations and actual leaks using self-contained analysis of the sensor signal patterns. The system performs self-diagnosis by analyzing the temporal and spatial characteristics of moisture detection signals, enabling reliable leak identification without requiring external intervention or complex processing.
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 solution provides a cost-effective and reliable method for detecting coolant leaks, distinguishing between humidity and actual leaks, and triggering alerts, thereby preventing damage to the system's circuitry.
Implementation Method 1
microstrip differential trace moisture sensors driven by a resistance-capacitance low-pass filter and digital signal processing (DSP) to differentiate between humidity and actual coolant leaks
Data Source
AI summary
An apparatus includes a transmitter circuit configured to provide a transmitted waveform at a transmitter output, and a first microstrip differential trace extending from a first microstrip differential trace first end to a first microstrip differential trace second end. A first resistor has a first resistor first end coupled to the transmitter output and a first resistor second end coupled to the first microstrip differential trace first end. A second microstrip differential trace extends from a second microstrip differential trace first end to a second microstrip differential trace second end. A second resistor has a second resistor first end coupled to the transmitter output and a second resistor second end coupled to the second microstrip differential trace first end. A first receiver circuit has a first receiver circuit input coupled to the first microstrip differential trace second end, the first receiver configured to provide a first received signal. A second receiver circuit has a second receiver circuit input coupled to the second microstrip differential trace second end, the second receiver configured to provide a second received signal. A processor may receive the first received signal and the second received signal and perform digital signal processing on the first received signal and the second received signal, detect a coolant leak, and provide an alert upon detection of the coolant leak.