Flow Path Plate Stray Light Inhibition via Chamber Through Hole
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Solution Overview
Problem
Existing flow path plates for analyzing trace substances in liquids suffer from reduced measurement accuracy due to stray light issues, such as leakage and diffuse-reflection light, which complicates the detection of ultraviolet light and increases the complexity and cost of liquid chromatography apparatuses.
Innovation Solution
A flow path plate design featuring a transparent plate body with a flow path and a chamber with a through hole that inhibits measurement light transmission from the inner wall surface to the outside, using an internal part made of engineering or super engineering plastics that prevents light leakage and reflection, allowing for high-accuracy component measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional flow path plates are used with slits and light-condensing structures, then light transmission is improved, but positioning accuracy requirements increase and device complexity increases
Solution Approach 1:
The flow path plate is divided into multiple functional layers: a first light-transmitting resin layer with a first slit, an intermediate layer with a through hole, and a second light-transmitting resin layer with a second slit. This segmentation allows each layer to independently contribute to light transmission while reducing the positioning accuracy requirements for any single component.
Solution Approach 2:
The through hole in the intermediate layer is positioned within the chamber formed by the first and second light-transmitting resin layers. The measurement light passes through the first slit, through the chamber, through the through hole, and through the second slit in sequence. This nested arrangement allows light to be transmitted through multiple components without requiring high precision positioning of each individual component.
2Measurement precision
If multiple parts are used for light condensation and stray light prevention, then measurement accuracy is improved, but device complexity and installation burden increase
Solution Approach 1:
The first light-transmitting resin layer, intermediate layer, and second light-transmitting resin layer are combined into a single integrated flow path plate structure. The slits and through hole are formed as integral parts of this structure, eliminating the need for separate light-condensing components and stray light prevention devices that would increase device complexity.
Solution Approach 2:
The intermediate layer serves multiple functions: it provides structural support, defines the chamber boundaries, and contains the through hole for measurement light transmission. The light-transmitting resin layers simultaneously serve as both structural components and optical components for light condensation and stray light prevention.
3Measurement precision
If stray light prevention structures are added, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The light-transmitting resin layers are positioned specifically at the light incident side and light exit side to provide local light condensation and stray light prevention only where needed for measurement accuracy, rather than requiring complex structures throughout the entire device.
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 solution effectively reduces stray light, enhancing measurement accuracy and simplifying the installation process by minimizing the need for precise positioning of slits and reducing the number of parts required, thus lowering the burden on liquid chromatography apparatuses.
Implementation Method 1
The internal part is configured to inhibit transmission of the measurement light from the inner wall surface of the through hole to the outside
Data Source
AI summary
A flow path plate for analysis of a component in a liquid sample, flowing within the flow path plate, by irradiating the liquid sample with measurement light is provided. The flow path plate includes a plate body having transparency; a flow path formed within the plate body and through which the liquid sample passes; a chamber provided in a part of the flow path and formed by a space having a cross-sectional area greater than cross-sectional areas of other parts of the flow path; and an internal part for detection disposed in the chamber and having a through hole. The through hole has an inner wall surface and constitutes a part of the flow path. The measurement light passes through the through hole. The internal part is configured to inhibit transmission of the measurement light from the inner wall surface of the through hole to the outside.