Flow Cell Imaging in Liquid Chromatography Detectors
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Solution Overview
Problem
Existing liquid chromatography detectors face issues with bubbles and debris remaining inside the flow cell, affecting analysis accuracy, and current methods for confirming their presence are cumbersome and inefficient.
Innovation Solution
Incorporating a camera into the detector to image the flow cell's internal space, allowing for easy visual confirmation of bubbles or debris through a control unit that controls the camera's operation and displays or automatically analyzes the images for user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a camera is added to image the flow cell internal space, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The detector is designed to perform both detection functions (fluorescence, spectrophotometry, or refractive index measurement) and imaging functions using a single integrated system. The camera unit is incorporated into the detector housing, allowing it to serve dual purposes: capturing images of the flow cell internal space and working in conjunction with the optical system for analysis, thereby improving ease of operation without proportionally increasing device complexity
Solution Approach 2:
The control unit serves as an intermediary that manages both the detection operations and the camera operations. It processes detection signals and simultaneously controls the camera unit to capture images, coordinating these functions through a unified control interface that simplifies user interaction while managing the added complexity of the imaging capability
2Productivity
If manual confirmation methods are used to check for bubbles or debris, then device complexity is kept low, but ease of operation deteriorates and time is lost
Solution Approach 1:
The system provides visual feedback by capturing images of the flow cell internal space with the camera and displaying them on a display unit. This immediate visual feedback allows users to quickly confirm the presence or absence of bubbles or debris without manual inspection, significantly improving confirmation efficiency and reducing user workload compared to traditional manual methods
Solution Approach 2:
Instead of requiring direct visual inspection of the flow cell, the system creates a visual copy (image) of the flow cell internal space using the camera. This copy can be viewed on the display unit, allowing users to examine the flow cell contents without physically accessing or manipulating the flow cell, thereby improving efficiency and ease of operation
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 straightforward verification of flow cell cleanliness, reducing user workload and ensuring accurate analysis by visually confirming or automatically detecting the presence of bubbles or debris.
Implementation Method 1
by passing a sample liquid through an internal space of the flow cell while irradiating the flow cell with light, components in the sample liquid are detected and quantified by measuring the intensity of the light emitted from the flow cell
Implementation Method 2
a camera for imaging the internal space of the flow cell
Data Source
AI summary
A detector for a liquid chromatograph includes a flow cell (2) having an internal space (3; 3a; 3b) through which a liquid is passed, a light irradiation unit (4) including a light source (20) and configured to irradiate the flow cell (2) with light emitted from the light source (20), a light receiving unit (8) for receiving measurement light emitted from the flow cell (2), a camera (16) for imaging the internal space (3; 3a; 3b) of the flow cell (2), and a control unit configured to control an operation of the camera (16) to cause the camera (16) to perform imaging of the internal space (3; 3a; 3b) of the flow cell (2).