Helmet Contact Sensor Layout for Accurate Wearing Detection
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Solution Overview
Problem
Existing helmet wearing detection systems using capacitive sensors lack clarity on how multiple contact detection sensors detect head approach or contact, leading to inaccuracies in determining the wearing state of personal protective equipment.
Innovation Solution
A personal protective equipment wearing detection apparatus featuring a plurality of contact detection sensors attached to different positions on the equipment, with one sensor outputting a contact detection signal while the others are connected to GND, stabilizing the signal input to a controller for improved accuracy, and a wearing determiner determining the equipment's state based on signals from multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple contact detection sensors are used to detect head approach or contact, then the coverage and detection capability are improved, but the signal stability and measurement precision deteriorate due to signal interference and uncertainty in sensor configuration
Solution Approach 1:
The system divides the detection function into multiple independent contact detection sensors positioned at different locations on the helmet. Each sensor independently detects contact at its specific position, allowing the system to achieve comprehensive coverage while maintaining individual sensor signal stability. The segmentation of detection positions enables accurate determination of wearing state without signal interference.
Solution Approach 2:
The system combines signals from multiple contact detection sensors to determine the overall wearing state. By merging the detection results from multiple sensors positioned at different locations, the system achieves both comprehensive detection coverage and improved measurement precision through signal integration and logical combination of sensor outputs.
2Area of stationary object
If multiple contact detection sensors are connected to the controller simultaneously, then the detection coverage is improved, but the signal interference and false positives increase
Solution Approach 1:
The system performs preliminary evaluation of contact detection signals by checking multiple sensor inputs before determining the final wearing state. This preliminary action involves evaluating the pattern and consistency of signals across multiple sensors to distinguish genuine contact events from false positives, thereby improving reliability while maintaining comprehensive detection coverage.
Solution Approach 2:
The system uses feedback from multiple contact detection sensors to verify and cross-validate detection events. By comparing signals from different sensor positions and using the combined feedback to determine wearing state, the system reduces false positives while maintaining comprehensive detection coverage across the helmet surface.
3Device complexity
If a single contact detection sensor is used, then the system simplicity is maintained, but the detection accuracy and reliability of wearing state determination decrease
Solution Approach 1:
The system uses multiple contact detection sensors positioned at specific critical locations on the helmet rather than uniformly distributing sensors across the entire surface. This partial action approach places sensors only where contact detection is most critical for determining wearing state, achieving improved accuracy without excessive system complexity.
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
Enhances the accuracy of detecting the approach or contact of a person's body and improves the determination of the wearing state by using multiple sensors, reducing false positives and improving reliability compared to single-sensor systems.
Implementation Method 1
a plurality of contact detection sensors to be attached at a plurality of different positions on the personal protective equipment, the plurality of contact detection sensors being configured to output contact detection signals being electrical signals in accordance with the approach or contact of the body
Data Source
AI summary
A personal protective equipment wearing detection apparatus is provided which can accurately detect the approach or contact of a person's head by use of a plurality of contact detection sensors. A personal protective equipment wearing detection apparatus 100 includes a headband contact detection sensor 110 and a chin strap contact detection sensor 120, which are mounted on a headband 92 and a chin strap 94 of a helmet 90, respectively. The headband contact detection sensor 110 and the chin strap contact detection sensor 120 are connected to a controller 103 of a detection apparatus body 101. While one of the two contact detection sensors, the headband contact detection sensor 110 and the chin strap contact detection sensor 120, outputs a contact detection signal to the controller 103, the controller 103 connects the other contact detection sensor to GND.