Wearable Sensing Module Shielding Electromagnetic Interference
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Solution Overview
Problem
Wearable devices face challenges in accurately measuring physiological data due to interference from skin conditions, non-conductive media, and interactions with other sensors, limiting their effectiveness in health monitoring.
Innovation Solution
A sensing module utilizing eddy current induction measurement with a first coil, control component, and shielding component, which transmits and receives electromagnetic signals to perform contactless measurements, reducing interference and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photoplethysmography is used for measurement, then physiological data can be obtained through light penetration, but the measurement is affected by skin color, tattoos, and other disturbances that cause different depths of light penetration
Solution Approach 1:
The patent replaces the optical measurement system (photoplethysmography using light penetration) with an electromagnetic sensing system using coils and electromagnetic signals. This substitution eliminates the harmful effects of skin color, tattoos, and other optical disturbances, as electromagnetic signals at the designed frequencies can penetrate these barriers effectively to reach and measure physiological parameters.
Solution Approach 2:
The patent employs electromagnetic signals with specific frequency ranges (e.g., 1-100 kHz or higher) to optimize penetration depth through skin and tissue. By adjusting the frequency parameter of the electromagnetic signal, the system achieves appropriate penetration depths to measure physiological data while overcoming interference from skin conditions.
2Adaptability or versatility
If electromagnetic signals are transmitted without shielding, then measurement range is increased, but other sensors and signal transmission in the wearable device are affected
Solution Approach 1:
The patent introduces a shielding component as an intermediary element positioned between the electromagnetic signal source (coil) and other sensors or circuitry in the wearable device. This shielding component selectively blocks or directs electromagnetic signals, allowing the measurement range to be maintained while preventing harmful interference with other sensors and signal transmission pathways.
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 sensing module achieves accurate and interference-resistant measurements of conductive media like blood and tissue fluid, enhancing the reliability of wearable devices in health monitoring applications.
Implementation Method 1
sensing module for eddy current induction measurement
Implementation Method 2
control component is configured to drive the first coil to transmit a first emitting electromagnetic signal, and to receive a first induction signal generated from the first coil
Data Source
AI summary
A sensing module includes a first coil, a control component coupled to the first coil, and a shielding component positioned at least on a first side of the first coil. The control component is configured to drive the first coil to transmit a first emitting electromagnetic signal, and to receive an induction signal generated from the first coil induced due to a first feedback electromagnetic signal. The shielding component shields at least a portion of the first emitting electromagnetic signal transmitting toward a first direction.