Annular Optical Sensor Layout for Pulse Detection Alignment
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Solution Overview
Problem
Conventional detection devices using photoplethysmography face challenges in accurately measuring pulse rates due to misalignment of the sensor position, leading to ineffective sensing.
Innovation Solution
A detection device with an annular substrate and optical sensors arranged annularly, featuring light sources and photodiodes to ensure consistent contact and accurate pulse rate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is pressed to a portion of an arc by an elastic member in conventional detection devices, then the sensor can contact the subject, but the position of contact may be misaligned from the desired position for acquiring pulse rate
Solution Approach 1:
The annular sensor is divided into multiple independent sensing elements arranged around the circumference. Each sensing element can independently detect light from different angular positions, allowing the system to identify and select the optimal sensing position even when the overall annular structure is worn. This segmentation enables precise positioning without requiring the entire annular structure to be perfectly aligned.
Solution Approach 2:
The detection device incorporates a rotating mechanism that allows the annular sensor to rotate relative to the subject. By dynamically adjusting the angular position of the sensor, the system can find and maintain the optimal sensing position despite initial misalignment or wear. This dynamic adjustment capability ensures reliable pulse rate detection by continuously optimizing the sensor-subject contact position.
2Ease of operation
If the sensor position is misaligned, then the device structure remains simple, but sensing becomes difficult to perform
Solution Approach 1:
The system performs preliminary detection to identify the optimal sensing position before actual pulse rate measurement. The annular sensor first scans different angular positions to detect where the subject (finger) is actually located, then adjusts or selects the appropriate sensing elements for accurate measurement. This preliminary positioning action ensures that subsequent measurements are performed at the correct position, maintaining both ease of operation and measurement precision.
Solution Approach 2:
The detection device incorporates feedback mechanisms that monitor the quality of the detected signal and adjust the sensing position accordingly. By continuously monitoring the pulse signal strength and characteristics, the system can detect misalignment and automatically adjust the sensor position or select alternative sensing elements, ensuring accurate pulse rate detection while maintaining simple operation for the user.
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 sensing accuracy by ensuring proper alignment and enhances the detection of pulse rates, vascular images, and other biological information through improved signal processing and noise reduction.
Implementation Method 1
Detection devices that measure pulse rates using photoplethysmography are known
Data Source
AI summary
A detection device includes an annular substrate, optical sensors annularly arranged along the substrate, and a plurality of light sources annularly arranged correspondingly to the arrangement of the optical sensors.