Glucose Sensing via Mueller Matrix Polarimetry
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Solution Overview
Problem
Current methods for non-invasive glucose concentration measurement in biological tissues are inefficient in providing quick and accurate results, especially for low glucose levels.
Innovation Solution
A system utilizing a light source, polarization state generator, and polarization state analyzer to calculate a Mueller matrix and derive parameters such as the depolarization index and optical rotation angle from reflected light, enabling the determination of glucose concentration in biological tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional non-invasive measurement methods are used, then measurement speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent changes the measurement parameters by using multiple polarization states (at least 4 different polarizations) and calculating Stokes vectors and Mueller matrices from these multiple measurements. This parameter change enables accurate extraction of depolarization index and optical rotation angle, resolving the contradiction between speed and precision by obtaining multiple parameters simultaneously through polarimetric analysis rather than sequential single-parameter measurements
Solution Approach 2:
The patent transitions from single-parameter measurement to multi-dimensional polarimetric measurement by measuring Stokes parameters (S0, S1, S2, S3) and calculating the full Mueller matrix. This dimensional expansion provides multiple independent parameters (depolarization index, optical rotation angle) that can be used together to achieve both rapid and precise glucose concentration determination
2Ease of operation
If conventional non-invasive measurement methods are used, then non-invasive capability is maintained, but measurement accuracy for low glucose concentrations deteriorates
Solution Approach 1:
The patent measures at least 4 different polarization states and calculates multiple Stokes parameters and Mueller matrix elements to extract the depolarization index and optical rotation angle. These multiple parameters provide redundant information that improves the signal-to-noise ratio and measurement accuracy for low glucose concentrations while maintaining non-invasive operation
Solution Approach 2:
The patent uses the calculated depolarization index and optical rotation angle as feedback parameters to determine glucose concentration. The system processes the polarimetric data through mathematical relationships to continuously monitor and determine glucose levels, providing accurate feedback for low concentration measurements without invasive sampling
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 rapid and accurate measurement of low glucose concentrations, such as 20 mg/dl, through non-invasive means by processing light polarization changes, improving measurement speed and accuracy.
Implementation Method 1
a light source configured to generate a light beam
Implementation Method 2
The polarization state generator includes a modulator for changing a polarization of the light beam
Implementation Method 3
The polarization state analyzer is configured to receive the light beam reflected by the biological tissue
Data Source
AI summary
A system for sensing glucose concentration is provided and includes following components. A light source generates a light beam. The system may include a polarization state generator (PSG) for changing the polarization of the light beam, and then the light beam is emitted to a biological tissue. A polarization state analyzer (PSA) receives the light beam reflected from the biological tissue, and the received light beam is used to calculate Stokes vectors. A Mueller matrix is calculated according to the Stokes vectors. In some embodiments, the system includes an optical coherence tomography (OCT) in which the light beam is sensed by a detector for calculating the Mueller matrix. An optical rotation angle and a depolarization index are calculated in accordance with the differential Mueller matrix formalism. The glucose concentration is calculated in accordance with the optical rotation angle and the depolarization index.