PVDF Thin-Film Pressure Sensor Structure for Hypergravity Accuracy
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Solution Overview
Problem
Flexible thin film pressure sensors using PVDF material experience stress relaxation and wrinkle formation under hypergravity conditions, leading to sensitivity variation and decreased measurement accuracy.
Innovation Solution
A composite thin film pressure sensor with a PVDF matrix and carbon nanowires, encapsulated by a double-layer flexible composite layer composed of PDMS, silicon nitride, and GeSbTe films, which enhances strength and thermal insulation to maintain sensitivity and accuracy in hypergravity environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVDF material is used to produce piezoelectric films for flexible thin film pressure sensors, then the sensors can achieve basic piezoelectric functionality, but under hypergravity conditions the PVDF films experience stress relaxation causing wrinkles that affect sensitivity and measurement accuracy
Solution Approach 1:
The patent uses a composite structure consisting of PVDF piezoelectric film combined with a flexible support layer and encapsulation layer. The PVDF film provides piezoelectric functionality while the flexible support layer prevents wrinkle formation under hypergravity stress. This composite material approach resolves the contradiction by combining materials with complementary properties: PVDF for piezoelectric response and the support layer for mechanical stability.
Solution Approach 2:
The patent modifies the physical and mechanical parameters of the sensor structure by introducing a flexible support layer with specific elastic modulus and thickness parameters. This changes the stress distribution characteristics of the PVDF film, preventing stress concentration that leads to wrinkles. The encapsulation layer further modifies the protective parameters, shielding the PVDF film from environmental stress while maintaining piezoelectric sensitivity.
2Adaptability or versatility
If the sensor operates in hypergravity centrifugal environments, then it can enable cross-disciplinary research on multiphase media, but the high-g environment causes deformation in sensitive elements and structural deformation in polymer bonding structures leading to significant errors
Solution Approach 1:
The patent employs flexible thin film structures for the encapsulation layer that can accommodate hypergravity-induced deformations without compromising the internal sensor elements. The flexible support layer acts as a buffer that absorbs mechanical stress from the high-g environment, preventing transmission of deformation forces to the PVDF piezoelectric film and bonding structures, thereby maintaining measurement precision in hypergravity conditions.
Solution Approach 2:
The encapsulation layer serves as a protective cushion that is applied beforehand to shield the sensitive PVDF film and bonding structures from hypergravity-induced stresses. This pre-protective structure absorbs and distributes mechanical loads before they can cause deformation to the sensitive elements, ensuring accurate sensor readings in extreme gravitational environments.
3Ease of manufacture
If a simple PVDF film structure is used, then the sensor can be easily manufactured, but it lacks the strength and thermal insulation needed to maintain sensitivity under hypergravity-induced stress and temperature fluctuations
Solution Approach 1:
The patent creates a multi-layer composite structure where each layer contributes specific properties: PVDF film for piezoelectric function, flexible support layer for mechanical strength and wrinkle prevention, and encapsulation layer for thermal insulation and environmental protection. This composite approach maintains ease of manufacture through layer-by-layer fabrication while achieving superior structural integrity and thermal insulation compared to simple PVDF films.
Solution Approach 2:
The flexible support layer and encapsulation layer serve multiple functions simultaneously: they provide mechanical strength to prevent wrinkles, thermal insulation to maintain temperature stability, and structural support to withstand hypergravity stresses. This multi-functionality is achieved through carefully selected material properties and layer configurations that can be manufactured using standard thin film deposition and lamination techniques.
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's wrinkle-resistant ability and measurement accuracy are improved by the carbon nanowires' reinforcement and the encapsulation layer's thermal insulation, ensuring precise readings despite hypergravity-induced stress and temperature fluctuations.
Implementation Method 1
Flexible thin film pressure sensors using PVDF material experience stress relaxation and wrinkle formation under hypergravity conditions
Implementation Method 2
A composite thin film pressure sensor with a PVDF matrix and carbon nanowires, encapsulated by a double-layer flexible composite layer
Implementation Method 3
the encapsulation layer's thermal insulation, ensuring precise readings despite hypergravity-induced stress and temperature fluctuations
Data Source
AI summary
Provided is a flexible thin film pressure sensor applicable in a hypergravity centrifugal environment, comprising a composite thin film, two metal electrodes, and a flexible composite encapsulation layer. The composite thin film includes a polyvinylidene fluoride (PVDF) matrix and a carbon nanowire filled within the PVDF matrix. The PVDF matrix includes a lower PVDF layer and an upper PVDF layer. The two metal electrodes are respectively fixed to two surfaces of the composite thin film and overlap with each other. A region of the composite thin film located between the two metal electrodes is a polarized region. The flexible composite encapsulation layer has a double-layer structure, wherein two layers of the double-layered flexible composite encapsulation layer are disposed on the two surfaces of the composite thin film, respectively, and edge portions of the flexible composite encapsulation layer extend beyond the composite thin film and are fixed to each other.