Liquid Absorption Measurement Using Droplet Transmission Matching
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Solution Overview
Problem
Existing methods for determining the absorption or turbidity coefficients of liquids are inaccurate due to assumptions about collimated light and pathlength, and do not account for reflections and refractive index changes at liquid-glass interfaces, leading to incorrect measurements.
Innovation Solution
A method involving a data set of discrete liquid bodies with known shapes, sizes, and optical properties is used to determine absorption or turbidity coefficients by measuring transmission parameters and dimensional measurements, allowing for accurate calibration of incident light intensity without relying on pathlength assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the standard cuvette method with collimated light and fixed pathlength is used, then the measurement setup is simple, but the measurement accuracy deteriorates due to unaccounted reflections and refractive index changes at liquid-glass interfaces
Solution Approach 1:
The patent changes the fundamental parameters of the measurement approach by abandoning the fixed pathlength assumption and collimated light requirement. Instead, it uses a data set of discrete liquid bodies with varying shapes, sizes, and absorption coefficients, measuring multiple dimensional parameters (lengths, areas, volumes) to specify each body. This allows the system to account for reflections and refractive index changes by incorporating them into the comprehensive data set rather than trying to eliminate them through idealized conditions.
2Ease of operation
If the Beer's Law equation is applied assuming ideal conditions, then the calculation is straightforward, but the measurement accuracy deteriorates due to multiple reflections and pathlength assumptions that do not hold in practice
Solution Approach 1:
The patent creates a comprehensive data set that copies and stores the transmission characteristics of numerous discrete liquid bodies with known absorption coefficients and dimensional parameters. Rather than using a simple theoretical equation, the system builds an empirical reference library that captures real-world behavior including reflections and refractive index effects. The unknown absorption coefficient is then determined by comparing measurements against this copied reference data, maintaining ease of operation while improving accuracy.
3Productivity
If a fixed pathlength cuvette is used, then the measurement method is standardized, but the adaptability deteriorates when measuring liquids of different refractive indices or using non-collimated light
Solution Approach 1:
The patent creates a universal measurement approach that works with liquids of different refractive indices and with non-collimated light. The data set of discrete liquid bodies encompasses a wide range of shapes, sizes, and optical properties, making the system adaptable to various measurement conditions. The method measures multiple dimensional parameters (lengths, areas, volumes) that can specify any discrete body in the data set, providing universality across different liquid types and measurement scenarios.
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 determination of absorption and turbidity coefficients in liquids of varying sizes and shapes, accounting for real-world conditions and reflections, without the need for collimated light, thereby improving measurement accuracy.
Implementation Method 1
measuring a transmission value for light through said sample body
Implementation Method 2
determining an absorption coefficient of a liquid
Data Source
Figure 1~6
Figure 2
Figure 3~5
AI summary
A method of determining an absorption or turbidity coefficient of a liquid involves storing a set of data describing a plurality of droplets or other discrete bodies of liquid of different shapes, sizes and absorption or turbidity coefficients. Each body is captured as a combination of a measurable transmission parameter obtained by modelling the interaction of light with a drop, and of one or more dimensional measurements selected from lengths, areas and volumes. The absorption or turbidity coefficient is indicated also. By measuring the transmission of light through a real body of liquid, and making measurements allowing the droplet to be specified, the absorption or turbidity coefficient associated with a droplet giving rise to the same behaviour in transmitting light can be identified from the data set.