Dual Pressure Sensor Wearable Device Accuracy
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Solution Overview
Problem
Traditional pressure-sensing systems in wearable electronic devices face accuracy and reliability issues due to exposure to various operating conditions, such as moisture and contaminants, leading to drift and reduced performance over time.
Innovation Solution
A dual-pressure-sensing system is implemented, comprising an internal pressure-sensing device protected by an air-permeable membrane and an external pressure-sensing device directly exposed to the environment, with a processing unit coordinating their outputs to maintain accurate pressure measurements by switching between them based on monitored conditions and accuracy thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an external pressure-sensing device is used to provide real-time pressure measurements, then the response speed and real-time data availability are improved, but the reliability and accuracy deteriorate due to exposure to moisture and contaminants
Solution Approach 1:
The device is segmented into two separate pressure-sensing systems: an external pressure sensor exposed to the environment for real-time measurements, and an internal pressure sensor protected within a sealed chamber for reliable baseline measurements. This segmentation allows each sensor to fulfill its specific function without compromise.
Solution Approach 2:
A sealed membrane chamber acts as an intermediary between the external environment and the internal pressure sensor. The membrane allows pressure transmission while blocking moisture and contaminants, enabling the internal sensor to indirectly measure external pressure without direct exposure to harmful factors.
2Reliability
If an internal pressure-sensing device is used to provide protected measurements, then the reliability and accuracy are improved, but the response speed and real-time data availability deteriorate due to the sealed chamber
Solution Approach 1:
The sealed membrane chamber serves as an intermediary that transmits pressure changes to the internal sensor while protecting it from environmental contaminants. The membrane's properties are optimized to allow rapid pressure equilibrium while maintaining protection, thus improving response speed compared to fully sealed designs.
Solution Approach 2:
The system performs preliminary calibration by comparing internal and external sensor readings under known conditions. This preliminary action establishes a baseline relationship that compensates for the internal sensor's delayed response, enabling real-time accurate measurements even when the internal sensor lags slightly.
3Measurement precision
If a dual pressure-sensing system is implemented, then the overall accuracy and reliability are improved through calibration and switching, but the device complexity increases
Solution Approach 1:
The system dynamically switches between using the external sensor for real-time measurements and the internal sensor for calibration and verification. The processing unit adaptively determines which sensor to trust based on environmental conditions, sensor readings consistency, and pre-established accuracy thresholds, optimizing measurement accuracy without requiring both sensors to operate simultaneously at full capacity.
Solution Approach 2:
The system continuously monitors the outputs of both pressure sensors and uses feedback mechanisms to detect discrepancies. When the external sensor reading deviates from the internal sensor reading beyond a threshold, the system triggers recalibration or switches to the more reliable internal sensor, ensuring sustained measurement accuracy through active feedback control.
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
This configuration enhances the reliability and accuracy of pressure measurements by utilizing the internal device for protected, stable readings and the external device for real-time, instantaneous data, while also allowing for calibration and maintenance to ensure consistent performance.
Implementation Method 1
an air-permeable membrane positioned at an opening defined in the internal wall and configured to equalize a first pressure within the first internal chamber with respect to a second pressure of the external environment
Data Source
AI summary
Embodiments include a wearable electronic device including a housing having an internal wall separating an internal chamber from an external chamber, an outer shell defining a port that connects the external chamber to an external environment, a membrane positioned at an opening in the internal wall and configured to equalize a pressure within the internal chamber with a pressure of the external environment, a first pressure-sensing device positioned in the internal chamber and configured to produce a first output, a second pressure-sensing device positioned in the external chamber and configured to produce a second output, and a processing unit configured to estimate the pressure of the external environment using the second output in accordance with a determination an accuracy condition satisfies a criteria and estimate the pressure of the external environment using the first output in accordance with a determination the accuracy condition does not satisfy the criteria.