Apparatus and method for estimating target component
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Solution Overview
Problem
Existing non-invasive methods for estimating components like blood glucose and carotenoids using Raman or Near-infrared spectroscopy are hindered by the absorption effects of hemoglobin and melanin, leading to reduced accuracy across different skin colors.
Innovation Solution
An apparatus and method that corrects reflectance values based on melanin and hemoglobin indices, converting reflectance to absorbance, and applying correction ratios to estimate target components accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectrum-based sensing is used to estimate target components, then non-invasive measurement is achieved, but measurement precision deteriorates due to melanin absorption
Solution Approach 1:
The patent converts the harmful melanin absorption effect into a beneficial factor by using the melanin index as a correction parameter. The system measures the melanin index from the spectrum and applies it to correct the target component estimation, thereby transforming the previously harmful absorption effect into a useful correction mechanism that improves measurement accuracy across different skin tones
Solution Approach 2:
The patent changes the parameter space by introducing the melanin index as an additional correction parameter. Instead of directly using the raw spectrum for target component estimation, the system first calculates the melanin index and then uses it to adjust the estimation parameters, thereby compensating for melanin's absorbing effect and improving measurement precision
2Measurement precision
If spectrum-based sensing is used to estimate target components, then non-invasive measurement is achieved, but measurement precision deteriorates due to hemoglobin absorption
Solution Approach 1:
The patent converts the harmful hemoglobin absorption effect into a beneficial factor by using the hemoglobin index as a correction parameter. The system measures the hemoglobin index from the spectrum and applies it to correct the target component estimation, thereby transforming the previously harmful absorption effect into a useful correction mechanism that improves measurement accuracy
Solution Approach 2:
The patent changes the parameter space by introducing the hemoglobin index as an additional correction parameter. Instead of directly using the raw spectrum for target component estimation, the system first calculates the hemoglobin index and then uses it to adjust the estimation parameters, thereby compensating for hemoglobin's absorbing effect and improving measurement precision
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
Improves accuracy in estimating target components by compensating for the effects of melanin and hemoglobin, enhancing precision across various skin tones.
Implementation Method 1
a sensor (110) configured to obtain a spectrum of light scattered or reflected from an object
Implementation Method 2
a sensor (110) configured to obtain a spectrum of light scattered or reflected from an object
Implementation Method 3
convert the second reflectance value into an absorbance value
Data Source
Figure 1
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Figure 2B
AI summary
The present disclosure relates to an apparatus for non-invasively estimating a target component value based on a light spectrum. The apparatus for estimating the target component value may include a sensor configured to obtain a spectrum of light scattered or reflected from an object, and a processor configured to correct a first reflectance value of the spectrum based on a melanin index; obtain a second reflectance value based on correcting the first reflectance value; convert the second reflectance value into an absorbance value; estimate the target component value based on the absorbance value; and correct the target component value based on a hemoglobin index.