Differential Pressure Sensors for Display Leak Detection
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Solution Overview
Problem
Existing methods for testing the leakage of electronic display assemblies, particularly those in ruggedized housings, are not reliable as they may not detect internal leak points or small leaks, and water testing does not consistently indicate actual sealing issues.
Innovation Solution
The use of differential pressure sensors to measure pressure differentials between sealed areas and ambient air, analyzing results to determine the sealing quality and location of leaks, and implementing testing procedures such as changing fan speeds to induce pressure changes and monitor responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water shower testing is used to test for leakage, then the testing method is simple and easy to perform, but the testing reliability is insufficient as it may not detect internal leak points or small leaks
Solution Approach 1:
The patent replaces the mechanical water shower testing system with a pneumatic differential pressure sensing system. Instead of using water to detect leaks, the system uses pressurized gas and differential pressure sensors to measure pressure changes, providing reliable detection of even small internal leak points while maintaining ease of operation through automated electronic measurement.
Solution Approach 2:
The patent introduces pressurized gas as an intermediary medium between the testing environment and the sealed enclosure. The gas serves as a mediator that can penetrate and pressurize internal cavities uniformly, allowing differential pressure sensors to detect leaks that water testing would miss, particularly internal and small leak points.
2Measurement precision
If differential pressure sensors are used to measure pressure differentials, then the measurement precision for detecting leaks is improved, but the device complexity increases
Solution Approach 1:
The differential pressure sensors serve multiple functions: they measure pressure differentials across sealed enclosures, detect leak points, monitor operational conditions during device use, and provide data for both manufacturing quality control and field performance monitoring. This multi-functionality justifies the added complexity by eliminating the need for separate testing and monitoring systems.
Solution Approach 2:
The system enables self-diagnosis and self-monitoring capabilities. The differential pressure sensors continuously monitor the sealed enclosures, and when leaks or operational issues are detected, the system can automatically alert operators or even initiate corrective actions, reducing the need for manual inspection and increasing device autonomy.
3Stability of the object's composition
If access panels are closed to seal testing areas, then the sealing quality is improved, but the time required for pressure equilibrium increases due to potential leaks
Solution Approach 1:
The differential pressure sensors provide continuous feedback on pressure differentials across sealed enclosures. This real-time data allows operators to immediately identify when pressure equilibrium has been reached or when leaks are occurring, eliminating the need for prolonged waiting periods and enabling rapid quality assessment during manufacturing and testing.
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 provides a more reliable method for detecting leaks and monitoring operational conditions, allowing for timely alerts and improved sealing assessment, enhancing the reliability of electronic display assemblies in harsh outdoor environments.
Implementation Method 1
one or more differential pressure sensors may be provided at such units to measure pressure differentials between circulating gas in closed loops or other fully or partially sealed areas
Implementation Method 2
Such ambient air may pass through one or more open loop airflow pathways within the assembly, and may thermally interact with circulating gas in one or more closed loop airflow pathways
Data Source
AI summary
Electronic display assemblies providing enhanced leak detection, and systems and methods related to the same, are provided. A differential pressure sensor detects a differential pressure between an ambient environment and a testing area of the electronic display assembly. A controller determines differential pressure readings based on data received from the differential pressure sensor and selectively generates electronic notifications based on said differential pressure readings.