Contactless ECG Biometric Recognition via Capacitive Sensing
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Solution Overview
Problem
Existing biometric recognition systems are limited by requiring direct contact with the user, using metallic electrodes, and being suitable only for momentary validation, which distracts users and is not suitable for continuous recognition, especially in environments with intense motion or electromagnetic noise.
Innovation Solution
A device comprising a computational unit and a sensory unit that measures ECG signals continuously without direct contact or metallic electrodes, using non-metallic conductive elements or capacitive sensors, allowing for continuous biometric recognition even in motion-intensive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ECG measurement methods using metallic electrodes and direct contact are used, then measurement precision is improved, but ease of operation deteriorates and user distraction increases
Solution Approach 1:
The patent replaces the mechanical contact-based ECG measurement system (metallic electrodes requiring direct skin contact) with a contactless capacitive sensing system. The sensory unit uses capacitive coupling to detect ECG signals through the body without physical contact, thereby maintaining measurement precision while dramatically improving ease of operation and eliminating user distraction.
Solution Approach 2:
The patent introduces air or insulation material as an intermediary between the sensory unit and the user's body. This intermediary layer enables capacitive coupling to transmit ECG signals without direct contact, resolving the contradiction by allowing accurate measurement while eliminating the need for uncomfortable or distracting physical contact.
2Reliability
If momentary biometric validation is performed, then authentication accuracy is improved, but productivity deteriorates due to task interruption
Solution Approach 1:
The patent transforms momentary biometric validation into continuous biometric recognition. The system continuously monitors ECG signals in the background without requiring user initiation or task interruption, maintaining authentication reliability while eliminating productivity loss from repeated stop-and-validate cycles.
Solution Approach 2:
The system performs automatic continuous authentication without requiring user action. The ECG signals are captured and processed automatically in the background, allowing the authentication process to serve itself without distracting the user from their primary tasks.
3Measurement precision
If direct contact with metallic electrodes is required, then measurement precision is improved, but object-affected harmful factors worsen due to motion interference
Solution Approach 1:
The patent replaces the mechanical contact-based measurement system with a contactless capacitive sensing system. This substitution eliminates motion artifacts and skin contact issues while maintaining ECG signal quality, thereby improving robustness in motion-intensive environments without sacrificing measurement precision.
Solution Approach 2:
By introducing air or insulation material as an intermediary, the system creates a stable capacitive coupling that is less sensitive to motion and electromagnetic interference than direct skin contact with metallic electrodes. This intermediary layer filters out harmful factors while preserving the essential ECG signal.
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
Enables uninterrupted biometric recognition, reducing user distraction and improving usability in various environments, while eliminating the need for direct contact and metallic electrodes, thus enhancing the reliability and convenience of biometric authentication.
Implementation Method 1
using non-metallic conductive elements or capacitive sensors
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present invention is related with the field of signal measurement for biometric recognition purposes, and refers to a computational unit and a sensory unit designed to measure electrocardiographic (ECG) signals in a continuous fashion, guaranteeing that the biometric recognition is performed in an uninterrupted way whenever the device is used, with the purpose of enabling the automated recognition or validation of the identity of its wearer. The sensory unit has an electronic module through which the ECG is acquired. Its operating principle can be based in the electrical conductivity, in which case it requires contact with the skin of the user, or in any kind of capacitive or mechanical element, in which case it does not require any direct contact with the user. The device can be used in alternative or as a complement to existing systems that only perform a momentary identity check. It can be applied to vehicles, tablet computers or analogous contexts.