Dual Optical Sensor Detection for Pulse Wave Velocity
Solution Overview
Problem
Existing optical sensors are unable to accurately measure pulse wave velocity using fingerprint and vascular pattern detection.
Innovation Solution
A detection device comprising a first and second optical sensor, a light source, and a processor that calculates pulse wave velocity based on the time-series variation of outputs from both sensors and a predetermined distance between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single optical sensor is used to detect biological information, then the device structure is simple, but the measurement precision of pulse wave velocity is insufficient
Solution Approach 1:
The detection device is segmented into multiple optical sensors (first optical sensor and second optical sensor) positioned at different locations. Each sensor detects light independently, and the processor combines their outputs to calculate pulse wave velocity, thereby improving measurement precision through spatial distribution of detection points
Solution Approach 2:
The invention transitions from single-point detection to multi-point spatial detection by arranging optical sensors at different positions along the blood vessel path. This dimensional expansion enables the system to measure not only the presence of pulse waves but also their propagation characteristics across space
2Measurement precision
If optical sensors detect only surface information, then the detection is simple, but the sensitivity to internal vascular patterns is reduced
Solution Approach 1:
The optical sensor system is designed to perform multiple detection functions simultaneously: it detects both surface fingerprint patterns and internal vascular patterns using the same sensor array. The processor distinguishes between surface reflections and internal tissue signals through signal processing, enabling universal detection capability
Solution Approach 2:
Light acts as an intermediary that penetrates through skin tissue to reach blood vessels. By selecting appropriate wavelengths and analyzing light absorption characteristics, the system uses light as a mediator to indirectly detect internal vascular structures without direct contact or invasive procedures
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
Enables accurate detection of pulse wave velocity by utilizing different wavelengths of light to detect surface and internal biological information, improving sensitivity and reducing measurement errors.
Implementation Method 1
a light source configured to emit light to be detected by the first optical sensor and the second optical sensor facing a living body tissue including a blood vessel
Implementation Method 2
a processor configured to calculate a pulse wave velocity of the blood vessel based on a time-series variation of an output of the first optical sensor, a time-series variation of an output of the second optical sensor, and the predetermined distance
Data Source
AI summary
A detection device includes a first optical sensor, a second optical sensor disposed at a predetermined distance from the first optical sensor, a light source that emits light to be detected by the first optical sensor and the second optical sensor facing a living body tissue including a blood vessel, and a processor that calculates a pulse wave velocity of the blood vessel based on a time-series variation of an output of the first optical sensor, a time-series variation of an output of the second optical sensor, and the predetermined distance.