Dynamic Wavelength Selection for Pulse Wave Measurement Accuracy
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Solution Overview
Problem
Pulse wave measuring apparatuses face challenges in maintaining measurement accuracy due to shifting optimal wavelengths caused by variations in light emitting/light receiving element properties and hemoglobin absorption properties, leading to decreased pulse wave variation detection and increased noise influence.
Innovation Solution
A biological information measurement apparatus that selects a suitable wavelength for measurement by analyzing light amount variations across multiple wavelengths using a spectrometer, adjusting the light source intensity to maximize signal-to-noise ratio, and employing multiple LEDs or light receiving elements to determine the optimal wavelength for pulse wave measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed wavelength light emitting portion and light receiving portion properties are matched for hemoglobin absorption detection, then initial measurement sensitivity is improved, but measurement accuracy deteriorates over time due to wavelength shifting from property variations
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed wavelength detection system to a dynamic wavelength selection system. The light receiving portion can selectively detect light amounts at multiple different wavelengths based on variation components, allowing the system to adapt to property variations in the light emitting portion and hemoglobin absorption characteristics, thereby maintaining measurement accuracy over time.
Solution Approach 2:
The patent implements parameter changes by enabling the light receiving portion to detect light amounts at multiple different wavelengths rather than a single fixed wavelength. This allows the system to identify and select the optimal wavelength for pulse wave detection based on actual variation components, compensating for drift in light emitting portion properties or hemoglobin absorption characteristics.
2Adaptability or versatility
If multiple variation components accumulate in composite manner, then comprehensive measurement capability is improved, but optimal detection wavelength shifts causing decreased pulse wave variation detection
Solution Approach 1:
The system dynamically selects the detection wavelength based on the specific measurement conditions and variation components present. By enabling the light receiving portion to detect light amounts at multiple different wavelengths, the system can adapt to different measurement scenarios and maintain high detection accuracy despite accumulated variation components.
Solution Approach 2:
The patent employs feedback by using the detected light amount variations at multiple wavelengths to determine the optimal detection wavelength. The system analyzes the variation components and selects the wavelength that provides the best pulse wave detection, creating a feedback loop that maintains measurement precision despite changing conditions.
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 allows for stable and accurate pulse wave measurement by dynamically selecting the most suitable wavelength, reducing noise influence and improving measurement accuracy.
Implementation Method 1
a light receiving portion configured to receive a light amount of reflected light of the light from the measurement target
Implementation Method 2
An optical absorption property of hemoglobin in the blood is generally used for pulse wave measurement
Data Source
AI summary
A biological information measurement apparatus comprises: a light source which illuminates a measurement target with light; a light receiving portion which receives a light amount of reflected light of the light from the measurement target; and a selecting unit which, based on a light amount received by the light receiving portion at each of a plurality of wavelengths of the reflected light, selects a wavelength to be used to measure biological information from the plurality of wavelengths.