Flexible Dielectric Impact Sensor for Helmet Monitoring
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Solution Overview
Problem
Conventional impact sensors for protective equipment, such as helmets, are often rigid and expensive to manufacture, limiting their flexibility and conformability, which is necessary for effective impact monitoring in applications like sports equipment and biomedical engineering.
Innovation Solution
A flexible impact sensing system is developed using a dielectric layer with printed electrodes on either side, allowing capacitance to change with movement, coupled with a readout circuit to measure and output voltage, and integrated with a wireless communication module for real-time data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional impact sensors are used, then measurement precision is improved, but flexibility and conformability deteriorate
Solution Approach 1:
The patent employs a flexible substrate as the base for the impact sensor, replacing rigid conventional sensor mounts. This flexible substrate allows the sensor to conform to curved surfaces such as helmets while maintaining its measurement capabilities through the use of flexible electronic components including printed circuit boards and elastic conductive traces.
Solution Approach 2:
The sensor assembly combines multiple materials with different properties: the flexible substrate provides conformability, the cushioning layer provides mechanical compliance and impact attenuation, the rigid template provides structural support and sensor positioning, and the electronic components provide measurement functionality. This composite structure resolves the contradiction between rigidity for measurement and flexibility for conformability.
2Measurement precision
If conventional impact sensors are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The sensor system is divided into separate functional modules: the flexible substrate with embedded sensors, the rigid template for mounting, the cushioning layer for protection, and the electronic circuitry for signal processing. This segmentation allows each component to be manufactured independently using optimized processes and then assembled, reducing overall manufacturing complexity and cost.
Solution Approach 2:
The patent replaces traditional mechanical sensor mounting systems with a more integrated approach where sensors are printed directly onto flexible substrates. This eliminates the need for complex mechanical assemblies, reduces part counts, and enables lower-cost manufacturing through printed electronics techniques.
3Stability of the object's composition
If rigid sensor structures are used, then stability is improved, but flexibility deteriorates
Solution Approach 1:
The flexible sensor assembly is nested within the rigid template structure, which in turn is positioned within the cushioning layer inside the helmet. This nested arrangement allows the flexible sensor to maintain stability through the constraining rigid template while still achieving flexibility through the compliant cushioning layer and flexible substrate.
Solution Approach 2:
The sensor system transitions from a static rigid structure to a dynamic system where the flexible substrate can deform elastically during impact events. This dynamic response allows the sensor to adapt to varying impact conditions while maintaining measurement stability through the elastic recovery of the flexible materials.
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 system provides enhanced flexibility and stability for impact monitoring, enabling real-time data collection and analysis of impact severity, aiding in assessing potential head trauma or concussions, and can be integrated into various protective equipment.
Implementation Method 1
the layer maintains a capacitance between to the first electrode and the second electrode that changes with a movement of the second electrode toward or away from the first electrode
Implementation Method 2
a second printed electrode on a second side of the layer overlying and moveable toward and away from the first electrode by deformation of the flexible dielectric layer
Data Source
AI summary
An impact sensing system includes a first impact sensor having a flexible dielectric layer, a first printed electrode on a first side of the layer, and a second printed electrode on a second side of the layer. The second printed electrode overlies and is moveable toward and away from the first electrode by deformation of the flexible dielectric layer. Further, the layer maintains a capacitance between to the first electrode and the second electrode that changes with a movement of the second electrode toward or away from the first electrode. The system further includes a first readout circuit electronically coupled with the first and second electrodes to measure a change in the capacitance and output a corresponding voltage.