Bio-optical Measuring Apparatus Noise Reduction via Signal Averaging
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Solution Overview
Problem
Bio-optical measuring apparatuses face challenges in accurately removing noise from signals, particularly in non-invasive blood flow rate measurements, due to various noise sources, which affects the accuracy and reliability of the measurements.
Innovation Solution
The apparatus employs a configuration with a light source and multiple optical receivers, along with a signal processing circuit that performs averaging processing on detection signals to obtain low-noise signals, reducing in-phase noise and enabling accurate noise removal with a minimal number of devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple optical receivers are used to reduce noise through averaging processing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the functional roles of optical receivers based on their light reception paths. Receivers detecting light from the living body perform measurements, while receivers detecting reflected light from the reflective plate generate reference signals. This functional differentiation allows the system to achieve high noise removal accuracy through averaging processing while maintaining a manageable device complexity by using receivers with specialized, non-overlapping functions.
2Reliability
If more optical receivers are deployed to reduce in-phase noise, then reliability is improved, but the number of devices increases
Solution Approach 1:
The patent segments the function of optical receivers into two distinct groups: those detecting light reflected from the living body (for measurement signals) and those detecting light reflected from the reflective plate (for reference signals). This segmentation allows the system to achieve high reliability through averaging processing of multiple receivers while keeping the total number of devices minimal, as each receiver has a specialized function rather than requiring redundant identical units.
Solution Approach 2:
The reflective plate serves as an intermediary element that enables the system to generate reference signals without requiring additional complex components. By reflecting light from the light source to specific optical receivers, the reflective plate creates a controlled reference path that allows these receivers to provide stable reference signals for noise removal, thereby improving reliability without proportionally increasing the number of active measurement devices.
3Measurement precision
If averaging processing is performed using detection signals from multiple receivers, then noise removal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the functional roles of optical receivers based on their light reception paths. Receivers detecting light from the living body perform measurements, while receivers detecting reflected light from the reflective plate generate reference signals. This functional differentiation allows the system to achieve high noise removal accuracy through averaging processing while maintaining a manageable device complexity by using receivers with specialized, non-overlapping functions.
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 approach effectively reduces noise interference, allowing for highly accurate blood flow rate measurements with a smaller number of devices, enhancing the reliability and precision of the bio-optical measuring apparatus.
Implementation Method 1
a light source that emits coherent light
Implementation Method 2
optical receivers that receive reflected light from a living body, of light outputted from the light source toward the living body
Implementation Method 3
a signal processing circuit that obtains a low-noise signal by performing averaging processing based on a detection signal outputted from each of the optical receivers
Data Source
AI summary
A bio-optical measuring apparatus according to an embodiment of the present disclosure includes a light source that emits coherent light; and three or more optical receivers that receive reflected light from a living body, of light outputted from the light source toward the living body. The bio-optical measuring apparatus further includes a signal processing unit that obtains a low-noise signal by performing averaging processing based on detection signals outputted from the respective optical receivers in response to reception of the reflected light.