Biological Information Detection with Multi-Port Noise Reduction
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Solution Overview
Problem
Existing pulse wave measuring devices face challenges in reducing noise caused by body motion due to differences in light penetration depths and absorbance characteristics across various wavelengths, making it difficult to accurately detect biological information.
Innovation Solution
A biological information detecting device with multiple light receiving portions and a processing unit that adjusts the distance and height of light-transmissive members to differentiate signal characteristics, using one light receiving portion for pulse signal detection and another for body motion noise detection, and employing a motion sensor for additional noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light with different wavelengths is used to measure pulse wave by detecting reflected light, then absorbance characteristics can be utilized to extract pulsation components, but differences in penetration depths cause additional noise that cannot be effectively reduced
Solution Approach 1:
The patent divides the light receiving function into multiple separate light receiving portions (first light receiving portion and second light receiving portion) positioned at different distances from the light emitting portion. Each portion detects light at different penetration depths, allowing the system to segment the detection of pulsation components from body motion noise, thereby resolving the contradiction between utilizing absorbance characteristics and eliminating penetration depth-related noise.
2Measurement precision
If multiple light receiving portions are used to detect signals with different characteristics, then body motion noise can be reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple light receiving portions and integrates them with a single light emitting portion to form a unified sensor structure. The processing portion merges the detection signals from both light receiving portions and applies noise reduction processing, achieving effective body motion noise reduction while maintaining a relatively compact and integrated device structure rather than completely separate components.
3Measurement precision
If the distance between light emitting portion and light receiving portion is varied, then signal characteristics differ enabling noise reduction, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by positioning the first and second light receiving portions at specifically different distances (L1 and L2) from the light emitting portion, where L1 < L2. This creates locally different detection characteristics - the first portion detects primarily pulsation components while the second portion detects both pulsation and body motion noise. The processing portion then utilizes these locally differentiated characteristics to perform noise reduction, balancing manufacturing feasibility with effective noise reduction.
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
This configuration effectively reduces body motion noise and improves the accuracy of biological information detection by correlating signals from different light receiving portions and utilizing a motion sensor for enhanced noise reduction.
Implementation Method 1
a first light receiving portion which receives light from a subject; a second light receiving portion which receives light from the subject; and at least one light emitting portion which emits light to the subject
Implementation Method 2
a photoelectric pulse wave sensor can measure the pulse wave by capturing the change in the volume of blood
Implementation Method 3
there are different extinction characteristics between oxygenated hemoglobin which is dominant in arterial blood and reduced hemoglobin which is dominant in venous blood
Data Source
AI summary
A biological information detecting device includes: a first light receiving portion and a second light receiving portion which receive light from a subject; a processing portion; and at least one light emitting portion (light emitting portion or the like) which emits light to the subject. When a distance between the light emitting portion and the first light receiving portion is set to L1 and a distance between the light emitting portion and the second light receiving portion is set to L2, L1<L2 is satisfied. The processing portion performs body motion noise reduction processing that reduces a body motion noise of a first detection signal which is detected by the first light receiving portion based on a second detection signal which is detected by the second light receiving portion, and calculates biological information based on the first detection signal after the body motion noise reduction processing.