Dual-Wavelength Concentration Measurement with Optical Path Correction
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Solution Overview
Problem
Existing concentration measurement methods face inaccuracies due to differing optical path lengths for first and second lights passing through a liquid, making it difficult to achieve precise concentration measurements.
Innovation Solution
A concentration measurement device and method that utilizes a well with a tubular side wall and a bottom portion, irradiating the liquid with first and second lights of specific wavelengths, and detecting their intensities to calculate concentration based on optical path lengths, ensuring the paths are closely aligned to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first light and second light pass through different positions in the liquid, then the measurement can be performed with simple device configuration, but the optical path lengths differ causing measurement inaccuracy
Solution Approach 1:
The patent introduces a meniscus correction mechanism as an intermediary element to compensate for the optical path length differences caused by liquid surface deformation. This mediator allows the system to maintain simple device configuration while achieving accurate concentration measurements by correcting the optical path variations.
Solution Approach 2:
The patent changes the measurement parameters by introducing correction factors based on the optical path lengths of first and second lights. By calculating and applying these correction factors, the system achieves accurate concentration measurements even when optical path lengths differ, without requiring complex alignment mechanisms.
2Measurement precision
If the optical paths of first and second lights are aligned to the same position, then measurement accuracy improves, but it becomes difficult to achieve due to meniscus deformation and stray light
Solution Approach 1:
The patent uses correction calculations as an intermediary computational step to compensate for the inability to physically align the optical paths. By introducing correction factors that account for meniscus deformation and stray light effects, the system achieves accurate measurements without requiring precise physical alignment of the optical paths.
Solution Approach 2:
The patent replaces the mechanical alignment approach with a computational correction approach. Instead of physically aligning the optical paths through mechanical adjustment, the system uses mathematical corrections based on measured optical path lengths to achieve the same measurement accuracy goal.
3Device complexity
If the first light and second light pass through different optical path lengths, then the device structure remains simple, but the concentration calculation accuracy decreases
Solution Approach 1:
The patent changes the calculation parameters by introducing correction factors that account for different optical path lengths. The concentration calculation formula is modified to include these correction factors, allowing accurate concentration determination even when the device structure remains simple and optical path lengths differ.
Solution Approach 2:
The patent implements a feedback mechanism where the optical path lengths of the first and second lights are measured and used to calculate correction factors. These correction factors are then fed back into the concentration calculation process, creating a closed-loop system that maintains accuracy despite structural simplicity.
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
The method enhances measurement accuracy by aligning the optical paths for first and second lights, reducing the influence of meniscus deformation and stray light absorption, thereby improving concentration calculation precision.
Implementation Method 1
A first light having a first wavelength and a second light having a second wavelength are made to pass through the liquid, and light intensities of the first light and the second light after passing through are detected. Then, an optical path length is calculated based on an absorbance calculated from the intensity of the first light after passing through, and the concentration of the sample is calculated based on the optical path length and an absorbance calculated from the intensity of the second light after passing through.
Data Source
AI summary
A concentration measurement device includes a well; a light irradiator; a light detector; and an arithmetic processor. The well includes a side wall having a tubular shape and a bottom portion closing one end of the side wall, and stores a liquid, in which a sample is dissolved or suspended in water, in an internal region formed by the side wall and the bottom portion. The light irradiator irradiates the liquid with a first light having a first wavelength and a second light having a second wavelength. The light detector detects light intensities of the first light and the second light that have passed through the liquid. The arithmetic processor calculates a concentration of the sample in the liquid based on an optical path length of the first light in the liquid and a second absorbance that is an absorbance of the liquid for the second light.