Porous Optical Fluid Sensing for Single-Fluid Refractive Index Calibration
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Solution Overview
Problem
Existing methods for determining fluid parameters, particularly refractive index, are limited by the need for multiple calibration fluids and complex calibrations, which can be costly and inefficient.
Innovation Solution
A method and system using a sensing element with pores that reflect or scatter radiation based on fluid refractive index, allowing determination of refractive index through optical signals from different fluids, utilizing a single calibration fluid to account for both absorption and scattering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple calibration fluids are used for determining refractive index, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses parameter changes by measuring optical signals at multiple different wavelengths to determine both absorption and refractive index simultaneously. By varying the wavelength parameter and measuring how absorption and scattering change across the spectrum, the system can distinguish between these two effects using a single calibration fluid, eliminating the need for multiple calibration fluids with different refractive indices.
Solution Approach 2:
The patent introduces wavelength as an intermediary parameter to separate the effects of absorption and refractive index. By using wavelength-dependent measurements, the system can mathematically decouple the contribution of absorption from scattering, allowing accurate refractive index determination without requiring multiple calibration fluids with different optical properties.
2Measurement precision
If multiple calibration fluids are used for determining refractive index, then measurement precision is improved, but loss of substance increases
Solution Approach 1:
The patent makes the single calibration fluid universal by using it for multiple purposes: determining both absorption coefficients and refractive index across different wavelengths. The calibration fluid serves multiple functions simultaneously - it calibrates the absorption response at each wavelength and provides the refractive index reference, eliminating the need for separate calibration fluids for each parameter.
Solution Approach 2:
By changing the measurement parameter from using multiple fluids with different properties to using multiple wavelengths with the same fluid, the system reduces substance consumption. The wavelength parameter varies continuously or discretely, providing multiple measurement dimensions without requiring additional physical calibration materials.
3Ease of operation
If absorption effects are not compensated for during calibration, then calibration simplicity is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent uses wavelength as an intermediary to separate and compensate for absorption effects during calibration. By measuring at multiple wavelengths, the system can mathematically identify and subtract the absorption contribution from the total optical signal, isolating the scattering component that contains the refractive index information. This automated multi-wavelength approach maintains calibration simplicity while achieving precise refractive index measurements.
Solution Approach 2:
The system implements feedback by using the measured absorption at each wavelength to correct the refractive index calculation. The absorption measurements provide feedback information that is used to adjust and refine the refractive index determination, ensuring accurate results even in the presence of significant absorption effects. This feedback mechanism is automatically applied during the calibration process.
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 precise and efficient determination of fluid parameters, such as refractive index and concentration, with reduced calibration complexity and cost, by leveraging the refractive index difference between fluids and scattering properties of the pores.
Implementation Method 1
the sensing element with the pores is well suited for such determination as the pores act to reflect or scatter the radiation, where this scattering or reflection depends on the refractive index of the fluid
Implementation Method 2
determining a refractive index of the third fluid based on the first, second and third optical signals
Data Source
AI summary
A system (10) for determining a refractive index of a sample fluid or a concentration of a component in the sample fluid comprises a transparent sensing element (12) with a plurality of pores (122) for receiving a fluid. The pores reflect or scatter radiation emitted by a radiation emitter (14) of the system differently depending on the refractive index of the fluid. The system comprises one or more detectors (16) for detecting the reflected and/or scattered radiation. The refractive index of the sample fluid is determined based on the detected scattered and/or reflected radiation when the sample fluid is fed into the pores, the corresponding detected scattered and/or reflected radiation when first and second calibration fluids having predetermined refractive indexes and predetermined absorptions at at least two wavelengths are fed into the pores, said predetermined refractive indexes and said predetermined absorptions. Alternatively, a concentration of a component in the sample fluid absorbing at a given wavelength may be determined based on the detected scattered and/or reflected radiation, a predetermined refractive index of the sample fluid, a predetermined refractive index and a predetermined absorption at said wavelength of a calibration fluid, and the detected scattered and/or reflected radiation when the calibration fluid is fed into the pores.