Fluid-Pressing Apparatus for Large-Area Pressure Sensor Calibration
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Solution Overview
Problem
Calibrating pressure sensors with large areas is challenging due to difficulties in achieving good planarity with rigid pressing units, leading to non-uniform pressure and high fabrication costs.
Innovation Solution
An electrical property measuring apparatus using a first and second plate that can be opened or closed, with a fluid supplying system to press on an object between the plates, allowing for the measurement of electrical properties through fluid pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rigid structure pressing unit is used to directly press on the sensor, then the pressing force can be applied, but the planarity of the contacting area deteriorates as the area increases, leading to non-uniform pressure
Solution Approach 1:
The patent employs a fluid pressing unit that uses hydraulic pressure to apply force to the pressure sensor array. The fluid (liquid or gas) is contained in a chamber and applied through a flexible diaphragm, allowing uniform pressure distribution across the entire sensor area without the planarity issues associated with rigid structures. The fluid pressure automatically equalizes across the contacting area, ensuring uniform pressing force regardless of area size.
Solution Approach 2:
The patent uses a flexible diaphragm as the pressing interface between the fluid chamber and the pressure sensor array. This flexible membrane conforms to the sensor surface and distributes pressure uniformly across the contacting area, eliminating the need for high-precision rigid structures while maintaining good planarity and uniform pressure distribution.
2Productivity
If the contacting area is increased to cover more sensors, then more sensors can be calibrated, but the planarity of the pressing unit deteriorates
Solution Approach 1:
The fluid-based pressing system allows calibration of large areas of pressure sensors while maintaining uniform pressure distribution. The hydraulic pressure automatically equalizes across the entire contacting area, enabling simultaneous calibration of multiple sensors across a large area without the planarity deterioration that occurs with rigid structures.
Solution Approach 2:
The flexible diaphragm serves as the pressing interface for large-area sensor arrays. Its flexibility allows it to conform to the sensor surface and distribute pressure uniformly across the entire contacting area, enabling high productivity calibration while maintaining good planarity regardless of the area size.
3Device complexity
If a rigid pressing unit is used, then the structure is simple, but the fabrication cost increases significantly to achieve good planarity
Solution Approach 1:
The fluid pressing unit replaces complex rigid structures with a simpler system consisting of a fluid chamber, flexible diaphragm, and pressure control mechanism. This approach reduces fabrication costs by eliminating the need for high-precision rigid components while maintaining structural functionality and achieving uniform pressure distribution.
Solution Approach 2:
The flexible diaphragm serves as a simple yet effective pressing interface that eliminates the need for expensive high-precision rigid structures. The flexible membrane can be easily manufactured and provides the necessary pressure distribution functionality at lower fabrication cost.
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 enables accurate and reliable measurement of pressure sensors by ensuring uniform fluid pressure, reducing fabrication costs and improving planarity, thus enhancing the calibration of pressure sensors with large areas.
Implementation Method 1
the fluid supplying system provides a fluid to the space so that the fluid presses on the object
Implementation Method 2
measuring an electrical property signal transmitted by the object due to a fluid pressure
Data Source
AI summary
An electrical property measuring apparatus for pressure sensor includes a first plate, a second plate, an object to be measured, an electrical property measuring unit used for measuring the electrical properties of the object, and a fluid supplying system. The second plate is opened or closed relative to the first plate. The object is disposed between the first plate and the second plate. The fluid supplying system connects to a space formed by the first plate and a pressed surface or a space formed by the second plate and a pressed surface. The fluid supplying system provides a fluid to the space such that the fluid presses on the object and the electrical property measuring unit measures the electrical properties of the object. A method of measuring electrical property for pressure sensor is also provided.