Ferroelectric Shear-Stress Sensor for High-Temperature Reliability
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Solution Overview
Problem
Current shear stress sensors are not reliable, easy to use, or capable of withstanding high temperatures, especially in applications involving complex flows and high-speed conditions, and lack the ability to simultaneously measure both normal and shear stress effectively.
Innovation Solution
A solid-state shear-stress sensor system comprising a substrate with a ferroelectric sensing material and offset electrodes, which generates an output signal in response to shear stress, using a DC bias voltage to induce polarization and measure shear force or stress, capable of operating in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shear stress sensors are used, then measurement capability is provided, but reliability and high-temperature capability are insufficient
Solution Approach 1:
The patent changes the material parameter by using ferroelectric material instead of conventional piezoelectric material, and operates at elevated temperatures (up to 1200K) to exploit the material's properties at high temperature, thereby achieving both reliability and high-temperature capability
Solution Approach 2:
The sensor employs a composite structure combining ferroelectric sensing material with appropriate electrodes and substrate materials, creating a composite system that maintains reliability under high-temperature conditions where conventional single-material sensors fail
2Measurement precision
If indirect methods (heat flux measurements) are used for shear stress measurement, then measurement is possible, but measurement precision and directness are reduced
Solution Approach 1:
The patent replaces indirect thermal measurement methods with direct mechanical stress measurement using ferroelectric material that generates electrical signals in response to applied shear stress, eliminating the need for complex heat flux measurements and providing direct, precise shear stress data
Solution Approach 2:
The invention extracts and measures only the shear stress component directly through the ferroelectric sensing material, separating this measurement from indirect thermal methods and providing dedicated, precise shear stress measurement capability
3Adaptability or versatility
If a sensor system is designed to measure both normal and shear stress, then measurement versatility is improved, but device complexity increases
Solution Approach 1:
The ferroelectric sensor system is designed to perform multiple functions - measuring both normal stress and shear stress components - within a single integrated sensor package, eliminating the need for separate sensor systems and reducing overall complexity
Solution Approach 2:
The patent merges the capability to measure both normal and shear stress into a single ferroelectric sensor element with appropriately oriented electrodes, combining multiple measurement functions that would traditionally require separate sensors into one unified device
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
The sensor system provides reliable, temporally and spatially resolved measurements of shear stress and normal stress, enabling effective use in high-temperature applications and complex flow conditions, such as in hypersonic vehicles and touch sensing applications.
Implementation Method 1
The first layer of sensing material may be a ferroelectric material. At least one of the at least two electrodes may be disposed on a surface of the sensing material, on a surface of the substrate, or within the first layer of the sensing material.
Implementation Method 2
A direct current (DC) bias voltage may be applied between or across the at least two electrodes during operation. A polarization may be induced between or across the at least two electrodes, wherein the polarization induces a first polarization vector.
Data Source
AI summary
A sensor systems including solid-state shear-stress sensors are presented. A solid-state shear-stress sensor system may include a substrate, a first layer of sensing material disposed on a first surface of the substrate, and at least two electrodes forming an electrode pair. The at least two electrodes may include a first electrode and a second electrode. The first electrode may be disposed in a first plane and the second electrode may be disposed in a second plane. The first and second planes may be associated with a first direction and may be substantially parallel to one another and the first surface. The first and second electrodes may be at least partially offset in the first direction. The sensor system may be configured to generate an output signal in response to a shear stress within the sensing material.