Biometric Sensor Contact Pressure Feedback via Low-Frequency Signal Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biometric information detecting methods face challenges in accurately measuring pulse waves without causing discomfort and ensuring optimal contact pressure, which affects the accuracy of biometric data such as blood pressure and oxygen saturation.
Innovation Solution
A biometric information detecting apparatus comprising a bio-signal measurer with a light-emitting and light-receiving unit, a low-frequency signal obtainer, and a signal processor that analyzes photoplethysmogram signals within a reference range, while providing adjustable contact pressure and displaying the pressure status, ensuring accurate data analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact pressure between the detecting apparatus and skin is increased to improve measurement accuracy, then measurement precision improves, but user comfort deteriorates
Solution Approach 1:
The system continuously monitors the low-frequency signal from the PPG measurement and uses it as feedback to determine whether contact pressure is appropriate. When the low-frequency signal falls within a predetermined range, the system indicates appropriate contact pressure, creating a closed-loop feedback mechanism that guides users to apply optimal pressure without causing discomfort.
Solution Approach 2:
The system performs preliminary assessment of contact pressure by analyzing the low-frequency signal characteristics before proceeding with full biometric measurement. This preliminary action allows the system to verify proper contact pressure is established, ensuring both measurement accuracy and user comfort from the start.
2Measurement precision
If contact pressure is adjusted to ensure optimal measurement conditions, then measurement precision improves, but ease of operation deteriorates
Solution Approach 1:
The display provides real-time visual feedback indicating whether contact pressure is appropriate based on the low-frequency signal analysis. This feedback simplifies the operation by clearly guiding users on whether their current contact pressure is correct, eliminating the need for users to understand complex adjustment procedures.
Solution Approach 2:
The system automatically monitors and assesses contact pressure conditions through the low-frequency signal analysis, performing the evaluation function itself without requiring user intervention or knowledge of the underlying measurement principles. Users simply need to follow the display guidance.
3Measurement precision
If low-frequency signal filtering is applied to improve biometric information analysis, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system extracts only the low-frequency signal component from the full PPG signal for contact pressure assessment. By isolating and analyzing only this specific frequency component, the system achieves accurate contact pressure monitoring without requiring complex processing of the entire signal spectrum, thus maintaining simplicity.
Solution Approach 2:
The signal processing is segmented into distinct frequency components, with the low-frequency portion specifically extracted for contact pressure evaluation. This segmentation allows the system to focus computational resources on the relevant frequency range, improving efficiency while maintaining measurement precision.
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 apparatus effectively measures biometric information like blood pressure and oxygen saturation by filtering low-frequency signals and adjusting contact pressure, enhancing measurement accuracy and user comfort.
Implementation Method 1
a light-emitting unit and a light-receiving unit, the light-emitting unit configured to emit an optical signal and the light-receiving unit configured to detect the optical signal that is modulated by a target object
Implementation Method 2
the light-receiving unit configured to detect the optical signal that is modulated by a target object
Data Source
AI summary
A biometric information detecting apparatus includes a bio-signal measurer including a light-emitting unit and a light-receiving unit, the light-emitting unit configured to emit an optical signal and the light-receiving unit configured to detect the optical signal that is modulated by a target object; a low-frequency signal obtainer configured to obtain a low-frequency signal from the bio-signal measured by the bio-signal measurer; and a signal processor configured to analyze biometric information from the bio-signal in response to determining that the low-frequency signal obtained from the bio-signal is within a reference range.