PPG Sensor Contact Validation Before Detector Activation
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Solution Overview
Problem
PPG sensors face issues with measurement failures due to incomplete contact, foreign substances, and movement, leading to meaningless signals and unnecessary power consumption, with conventional systems failing to identify and correct these issues effectively.
Innovation Solution
A PPG sensor with a transparent electrode window and detector that senses contact and illuminance, coupled with a processor to activate the detector based on contact, analyze signal similarity, and provide user feedback to correct measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PPG sensor continuously attempts measurement, then measurement completion is improved, but power consumption increases and LED light leaks to outside
Solution Approach 1:
The system performs preliminary contact detection using the transparent electrode window before activating the detector for measurement. This preliminary action identifies measurement failures due to poor contact or foreign substances in advance, preventing unnecessary continuous measurement attempts and associated power consumption.
Solution Approach 2:
The system provides feedback to the user when measurement failure is detected, explaining the cause (poor contact, foreign substance, or movement). This feedback mechanism allows users to correct the issue quickly, reducing the need for continuous measurement attempts and thereby lowering power consumption.
2Reliability
If the PPG sensor continuously attempts measurement, then measurement completion is improved, but LED light leaks to outside
Solution Approach 1:
The transparent electrode window performs preliminary contact validation before the measurement process starts. By detecting whether the user's finger is properly positioned and making complete contact with the sensor surface, the system prevents LED activation when measurement conditions are not met, thereby avoiding LED light leakage.
Solution Approach 2:
When measurement failure is detected, the system provides feedback to the user about the cause (e.g., poor contact, foreign substance). This feedback prevents repeated unnecessary measurement attempts that would cause LED light leakage, while still allowing measurement to proceed when conditions are appropriate.
3Speed
If the PPG sensor activates detector without contact detection, then measurement speed is improved, but measurement accuracy deteriorates due to meaningless signals
Solution Approach 1:
The transparent electrode window performs a preliminary contact detection action before the detector is activated. This ensures that the detector only measures when the user's finger is properly positioned and making complete contact, thereby preventing meaningless signals while maintaining quick measurement initiation.
Solution Approach 2:
The transparent electrode window acts as an intermediary between the user's finger and the detector. It validates contact conditions first, then allows the detector to function. This intermediary role ensures that only valid measurements are processed, improving signal accuracy without significantly delaying measurement initiation.
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
Quickly identifies and corrects measurement failures by ensuring proper contact, minimizing power consumption, and providing intuitive user feedback to improve signal quality.
Implementation Method 1
determining whether a contact between the PPG sensor and the user is poor based on an illuminance value sensed by the detector
Implementation Method 2
determine whether a contact between the PPG sensor and the user is poor based on an illuminance value sensed by the detector
Implementation Method 3
a PPG sensor including a light source, a detector and a transparent electrode window
Data Source
AI summary
An electronic device is provided. The electronic device according to an embodiment includes a Photoplethysmography (PPG) sensor including a light source, a detector and a transparent electrode window and a processor configured to, based on determining that a user is in contact with the PPG sensor based on a value sensed by the transparent electrode window, activate the detector, and determine whether a contact between the PPG sensor and the user is poor based on an illuminance value sensed by the detector.