Optical Sensor Layout for Wearable Blood Oxygen Accuracy
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Solution Overview
Problem
Conventional wearable electronic devices for detecting blood oxygen saturation are affected by variations in tightness and wearing angle, leading to inaccurate detection results due to inconsistent fitting and alignment.
Innovation Solution
An optical detection device with symmetrically arranged light emitters and sensors, utilizing multiple wavelength beams to analyze perfusion indices and intensity ratios, and employing predefined conditions to correct for wearing tightness and angle, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical sensors and light sources are used with simple arrangement, then device complexity is reduced, but measurement precision deteriorates due to inability to detect wearing tightness and angle variations
Solution Approach 1:
The patent divides the detection system into multiple independent light emitters (red and infrared) and multiple optical sensors arranged in specific patterns. This segmentation allows the system to separately measure different physiological parameters and compensate for wearing conditions, thereby improving detection accuracy without requiring a completely complex integrated system.
Solution Approach 2:
The patent employs asymmetric arrangement of optical sensors and light emitters at different positions and orientations. This asymmetric design enables the system to detect variations in wearing tightness and angle by analyzing the differential signals from sensors positioned at different locations,从而提高测量精度.
2Measurement precision
If multiple light emitters and optical sensors are added to improve detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent designs the multiple light emitters and optical sensors to serve multiple functions: measuring blood oxygen saturation, detecting wearing tightness, and determining wearing angle. This multi-functionality allows the system to improve detection accuracy for primary measurements while using the same components for calibration and compensation, thereby reducing the need for additional specialized components.
Solution Approach 2:
The patent uses the signals from multiple optical sensors and light emitters to create feedback loops that continuously monitor wearing conditions. The system analyzes the variations in signal intensity and patterns to detect changes in tightness and angle, then uses this feedback information to calibrate and compensate for measurement errors in real-time, improving overall detection accuracy.
3Illumination intensity
If optical sensors are placed close to light emitters, then signal strength increases, but ability to detect wearing angle and tightness variations decreases
Solution Approach 1:
The patent arranges optical sensors and light emitters in three-dimensional space at different positions and orientations rather than simply placing them close together in a planar arrangement. This spatial distribution in multiple dimensions allows the system to maintain sufficient signal intensity while creating geometric relationships that are sensitive to changes in wearing angle and tightness, enabling simultaneous signal strength and variation detection.
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 device improves detection accuracy by automatically adjusting for variations in tightness and wearing angle, ensuring precise determination of blood oxygen saturation and other physiological features.
Implementation Method 1
Absorption quantity of the red light by oxyhemoglobin is different from absorption quantity of the infrared light by the oxyhemoglobin
Implementation Method 2
the red light and the infrared light pierce through the skin to be reflected and absorbed by the blood in the vessel
Implementation Method 3
The optical sensor analyzes the received red light and the received infrared light to acquire an absorption ratio
Data Source
AI summary
An optical detection device is applied to an organism and includes a light emitting module, an optical detection module and an operation processor. The light emitting module includes a plurality of light emitters arranged along a first direction. The optical detection module includes a plurality of optical sensors arranged along a second direction and symmetrically relative to the light emitting module. The second direction is substantially different from the first direction. The optical sensors are substantially placed more outward from a center of the optical detection device than the light emitters. The operation processor is electrically connected to the optical detection module. The operation processor is adapted to analyze signal variation in the plurality of light emitters acquired by each of the plurality of optical sensors for determining a physiological feature of the organism.