Wearable Removal Detection via Induction Capacitance
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Solution Overview
Problem
Existing wearable devices lack an effective method to detect when they are removed from the user's body, which is crucial for monitoring and locating vulnerable individuals, such as children or elderly people.
Innovation Solution
A wearable device incorporating a copper foil electrode and an induction capacitor that measures electrical characteristics to determine if it has been removed from the user's body, using a bridging capacitor and control circuit to send a warning message and determine location via a wireless communication unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wearable devices are used to monitor vulnerable individuals, then user safety monitoring capability is improved, but the ability to detect device removal is insufficient
Solution Approach 1:
The patent replaces mechanical removal detection methods with an electrical field-based detection system. An induction capacitor senses changes in electrical characteristics when the device is removed from the body, enabling non-mechanical, more precise detection of device status changes.
Solution Approach 2:
The patent introduces an induction capacitor as an intermediary sensing element between the device and the user's body. This intermediary component detects electrical characteristic changes caused by body proximity, enabling indirect but accurate removal detection without direct mechanical contact sensing.
2Measurement precision
If electrical characteristic measurement is used to detect device removal, then removal detection precision is improved, but device complexity increases
Solution Approach 1:
The induction capacitor serves multiple functions: it acts as both the sensing element for removal detection and as part of the device's electrical circuit system. This multi-functionality reduces the need for separate dedicated sensing components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent detects removal by measuring changes in electrical parameters (capacitance, impedance, or frequency) of the induction capacitor. By monitoring parameter changes rather than using complex mechanical switches or sensors, the system achieves high detection precision with relatively simple circuitry.
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 reliable detection of removal and location determination, ensuring timely alerts and improved user safety by monitoring the device's proximity to the user's body through changes in electrical characteristics.
Implementation Method 1
an induction capacitor that measures electrical characteristics of the induction capacitor and determines whether the wearable device has been removed from the user's body based on the measured electrical characteristics
Data Source
AI summary
A wearable device with removal-detection function includes a component, a copper foil, a wireless communication circuit, and a monitoring unit. The copper foil is arranged in the component. An induction capacitor is formed between the copper foil and user's body when the component is in contact with user's body. The monitoring unit measures electrical characteristics of the induction capacitor, and can determine a removal from user's body based on the measured electrical characteristics. The monitoring unit further controls the wireless communication circuit to send a warning message plus location information to a monitoring terminal if the wearable device is removed.