Capacitive Humidity Sensor Layout for Secure Vehicle Authentication
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Solution Overview
Problem
Current systems for controlling vehicle access and user authentication based on moisture and pressure values lack precision and security, particularly in ensuring only authorized users can access vehicle systems safely and comfortably.
Innovation Solution
A capacitive moisture and pressure sensor system integrated into flexible carrier materials, such as woven fabrics, with electrodes and dielectric layers that measure capacitance changes due to moisture and pressure, communicating data to a central CPU for authentication and system control, including wireless communication and energy harvesting for power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If moisture and pressure sensors are used for user authentication, then vehicle access control can be implemented, but the precision and security of authentication are insufficient
Solution Approach 1:
The patent combines multiple sensing functions (moisture detection, pressure detection, temperature detection) into an integrated sensor system. The moisture sensor and pressure sensor are merged into a single authentication system, allowing cross-validation of measurements. This combination enables more precise user identification by analyzing multiple physiological parameters simultaneously, thereby improving both authentication precision and security without requiring separate sensor systems.
2Measurement precision
If capacitive sensors with dielectric layers are used, then moisture measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent employs thin-film capacitive structures with flexible dielectric layers deposited directly onto substrate surfaces. The dielectric layer is implemented as a thin film rather than a bulky component, maintaining sensor flexibility and conformability while providing sufficient capacitance modulation for accurate moisture measurement. This thin-film approach reduces structural complexity compared to traditional discrete capacitor designs.
Solution Approach 2:
The capacitive sensor structure serves multiple functions: it acts as both a moisture sensor and a pressure sensor, and can also function as a temperature sensor when combined with appropriate materials. This multi-functionality eliminates the need for separate sensor structures, reducing overall device complexity while maintaining high measurement precision through the universal capacitive measurement principle.
3Adaptability or versatility
If processing units and CPU are separated, then system modularity is improved, but data communication overhead increases
Solution Approach 1:
The system is divided into distinct functional modules: sensor modules for data acquisition, processing units for local signal conditioning and preliminary analysis, and a central CPU for high-level decision-making. This segmentation allows each module to be optimized independently and facilitates flexible system configuration. The processing units perform local preprocessing to minimize the amount of data that needs to be transmitted to the CPU, reducing communication overhead despite the modular architecture.
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
Provides accurate and secure user authentication by determining individual characteristics from moisture and pressure values, ensuring only authorized users access vehicle systems, enhancing safety and comfort while reducing power limitations through energy harvesting.
Implementation Method 1
the sensor comprises at least one capacitor with at least two electrodes which are arranged relative to one another... at least one dielectric layer is arranged between the electrodes... a capacitance is at least partially changed by the liquid at least partially impinging on the dielectric layer
Implementation Method 2
A capacitive humidity sensor is essentially a capacitor whose dielectric preferably consists of a hygroscopic polymer layer that absorbs or releases moisture depending on the ambient air humidity
Data Source
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AI summary
The invention relates to a control system for measuring pressure and/or humidity, comprising at least one device for measuring pressure and/or humidity, at least one sensor for measuring pressure and/or humidity, wherein the sensor comprises at least one capacitor having at least two electrodes which, in particular, are arranged in a horizontal direction along one another and on a, in particular, flexible carrier material. At least one dielectric layer is arranged between the electrodes, wherein at least one, at least partially liquid-permeable and/or liquid-absorbing moisture layer is arranged at least in places on one side, which faces away from the carrier material, of at least electrode and/or the dielectric layer. The at least one electrode and/or the dielectric layer are thus arranged in a transverse direction between the carrier material and the moisture layer, so that a capacitance at least partially changes due to the liquid at least partially incident on the dielectric layer, wherein a processing unit is set up and provided to measure and/or store measured values of the sensor. Thus, a capacitive humidity sensor is created. The invention is characterized in that the data captured by the sensor is sent from the processing unit to a central CPU, wherein said data is processed by the processing unit.