Liquid Chromatography Detector Flow Cell Housing Segmentation
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Solution Overview
Problem
Liquid chromatography detectors face issues with liquid leaks from the flow cell, which can cause organic solvent evaporation and corrosion of optical components, and providing a discharge port introduces the risk of outside air causing further deterioration.
Innovation Solution
A flow cell accommodating part made of light transmissive materials or sealed with light transmissive plates spatially separates the flow cell from the optical system, using elastic sealing members to prevent gas leakage and protect the optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a discharge port is provided below the flow cell to discharge leaked liquid, then the harmful effect of leaked organic solvent on the optical system is reduced, but outside air enters through the discharge port and causes deterioration or corrosion of the optical system
Solution Approach 1:
The housing is divided into two separate compartments: a first compartment containing the flow cell and a discharge port, and a second compartment containing the optical system. This segmentation allows the discharge port to be positioned in a location that does not directly expose the optical system to outside air, while still enabling leaked liquid to be discharged from the flow cell area.
Solution Approach 2:
A light transmissive plate is introduced as an intermediary component between the two compartments. This plate allows measurement light to pass through from the light source to the flow cell and from the flow cell to the detector, while simultaneously preventing outside air from the first compartment from reaching the optical system in the second compartment.
2Measurement precision
If the housing is formed into a substantially closed system to minimize intrusion of outside light and atmosphere, then measurement accuracy is improved, but leaked liquid has no place to escape and may submerge the flow cell or optical elements
Solution Approach 1:
The housing is segmented into two compartments with the discharge port located in the first compartment away from the optical system. This allows the housing to remain substantially closed to protect the optical system from outside light and atmosphere, while simultaneously providing a designated escape path for leaked liquid through the discharge port in the first compartment.
3Reliability
If the flow cell is spatially separated from the optical system using a flow cell accommodating part, then the optical system is protected from leaked liquid and outside air, but the structure complexity increases
Solution Approach 1:
The flow cell accommodating part is integrated into the housing structure, combining the functions of housing support and flow cell mounting. The light transmissive plate is incorporated as part of the housing wall structure, merging the functions of structural separation and optical transmission, thereby reducing overall structural complexity while maintaining protection benefits.
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
This configuration effectively prevents the influence of vaporized liquids and outside air on the optical system, reducing the need for frequent replacement of optical elements and lowering maintenance costs.
Implementation Method 1
the side surfaces facing the light incident surface and the light exit surface of the flow cell are formed from wall surfaces made of a light transmissive material, or sealed by a light transmissive plate material
Implementation Method 2
the intensity of the light transmitted through the flow cell is measured by the photodetector to obtain the absorbance in the predetermined wavelength range
Data Source
AI summary
A detector includes a light source configured to emit measurement light, a flow cell incorporating a cell channel through which a sample solution flows inside, a photodetector configured to detect light from the flow cell, an optical system configured to guide light from the light source to the flow cell and guide light from the flow cell to the photodetector, and a flow cell accommodating part configured to cover the flow cell so as to spatially separate the flow cell from the optical system. Of the side surfaces of the flow cell accommodating part, the side surfaces facing the light incident surface and the light exit surface of the flow cell are formed from wall surfaces made of a light transmissive material, or sealed by a light transmissive plate material.