PPG Sensor Layout for Accurate Wrist Blood Oxygen Detection
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Solution Overview
Problem
The accuracy of health detection data is relatively low due to the complex tissue structure of the to-be-monitored part of a user, such as the wrist, which interferes with the detection process and reduces the signal-to-noise ratio.
Innovation Solution
A detection apparatus with a specific arrangement of light sources and photodetectors, including at least three first light sources, three first photodetectors, and two second light sources, forms multiple light paths and PPG modules to enhance data accuracy by detecting at different skin depths and reducing interference from complex tissue structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a finger-clip oximeter is used to perform blood oxygen detection on the fingertip, then detection accuracy is improved, but the user experiences discomfort and cannot move the fingertip normally
Solution Approach 1:
The detection apparatus segments the detection function by using multiple independent light sources and photodetectors that can detect health parameters at different skin depths, allowing the system to obtain multiple detection signals simultaneously without requiring physical clamping on a single point
2Ease of operation
If a wearable device is used to perform blood oxygen detection on the wrist, then user comfort and mobility are improved, but detection accuracy is reduced due to complex tissue structure
Solution Approach 1:
The patent adds a depth dimension to the detection by using multiple light sources and photodetectors configured to detect at different skin depths. This multi-depth detection capability allows the system to penetrate through the complex wrist tissue structure and obtain clear blood oxygen signals from different layers, thereby improving accuracy while maintaining the comfort of wrist-based detection
3Measurement precision
If multiple light sources and photodetectors are arranged to detect at different skin depths, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a single integrated detection apparatus. Multiple light sources and photodetectors are combined in one device, with each photodetector configured to receive light from multiple light sources at different distances, enabling multi-depth detection without requiring multiple separate devices or complex mechanical structures
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 improves detection accuracy by increasing the number of light paths and PPG modules, allowing for more precise measurement of health parameters like blood oxygen and heart rate, even on complex tissue areas like the wrist.
Implementation Method 1
the first light source and the first photodetector in the light path may form one photoplethysmograph (PPG) module. Similarly, one light path may also be formed between one second light source and one first photodetector, so that the second light source and the first photodetector in the light path may form one PPG module.
Implementation Method 2
The PPG module can detect pulse data of the user. In this way, a quantity of light paths and a quantity of PPG modules corresponding to the light paths in the detection region may be increased
Data Source
AI summary
The present disclosure provides a detection apparatus and an electronic device. In the detection apparatus, a first photodetector is disposed between two adjacent first light sources, and second light sources are located in a detection region enclosed by a plurality of first light sources and a plurality of first photodetectors. The first light source has a first distance H1 and a second distance H2 from at least two of all first photodetectors, and the second light source has a third distance H3 and a fourth distance H4 from at least two of all first photodetectors. The first light sources, the second light sources, and the first photodetectors are distributed in distribution regions of the detection apparatus. Each light source and one photodetector may form one PPG module, and an effective detection depth in skin may vary with a distance between the light source and the photodetector.