Pressure Sensor Testing Device for Leak Detection
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Solution Overview
Problem
Existing devices for checking pressure sensors only verify their operativeness and not their tightness, which is crucial for preventing water vapor penetration and ensuring functional integrity, especially in harsh environments like vehicle impact sensing applications.
Innovation Solution
A device that tests the tightness of pressure sensors by analyzing the response signal to both static and dynamic pressure signals, using a combination of a test box and reference sensor to detect leaks, and employing a seal to connect with the pressure inlet channel, allowing for simultaneous operativeness and tightness measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only operativeness checking is performed using existing devices, then the functional verification is simple and quick, but the tightness of the pressure sensor cannot be detected
Solution Approach 1:
The patent combines operativeness checking and tightness checking into a single integrated testing procedure. The device applies pressure signals to the pressure sensor and analyzes the response signals to simultaneously determine both operational functionality and seal tightness, eliminating the need for separate testing procedures.
Solution Approach 2:
The testing device is designed to perform multiple functions: it can detect both the operational status and the tightness of the pressure sensor using the same hardware setup and pressure application mechanism, making the testing system versatile and reducing overall test system complexity.
2Measurement precision
If static pressure signal is used for tightness checking, then fine leaks can be detected through pressure variation over time, but the test requires longer duration to observe pressure changes
Solution Approach 1:
The patent employs both static pressure signals (for detecting fine leaks through gradual pressure variation) and dynamic pressure signals (for detecting coarse leaks through amplitude response). This dynamic approach allows the system to adapt the testing method based on the type of leak being detected, optimizing both precision and time efficiency.
3Productivity
If dynamic pressure signal is used for tightness checking, then coarse leaks can be detected through amplitude response, but fine leaks may not be detected with sufficient precision
Solution Approach 1:
The patent uses dynamic pressure signals to quickly detect coarse leaks through amplitude response analysis, while simultaneously or subsequently applying static pressure signals to detect fine leaks through pressure variation over time. This dynamic testing strategy optimizes both productivity and measurement precision.
4Measurement precision
If accommodation with seal is used to connect to pressure inlet channel, then the seal tightness can be measured, but other leaks in the housing cannot be detected
Solution Approach 1:
The patent employs multiple testing configurations: one using an accommodation with seal to measure seal tightness specifically, and another using a test box to detect leaks in the housing. This segmentation of testing approaches allows comprehensive leak detection covering both seal and housing integrity.
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
Effectively identifies both fine and coarse leaks in pressure sensors, ensuring their functional integrity and protection from corrosive effects, thereby enhancing the reliability of pressure sensors in impact sensing applications.
Implementation Method 1
a pressure inlet channel in the housing, which supplies the environmental pressure to a diaphragm that is mounted
Data Source
AI summary
A device for testing at least one pressure sensor, by applying a pressure signal, the device testing the operativeness of the pressure sensor as a function of the pressure signal. In addition, it is provided that the device tests the tightness of the pressure sensor as a function of the pressure signal.