Laser Rangefinder Adapter for Gas Chromatography Column Length Measurement
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Solution Overview
Problem
Accurate measurement of capillary column length in gas chromatography is challenging due to initial manufacturing errors and operator-induced uncertainties, requiring manual trimming and logbook maintenance, which can lead to inaccuracies and damage to the fragile columns.
Innovation Solution
A device and method utilizing a laser rangefinder adapter with a light guiding capillary and correction factors to measure capillary column length without dismounting it from its cage, enabling precise length determination without physical manipulation or logbook records.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual trimming and logbook maintenance are used to track column length, then column length can be monitored, but measurement precision and reliability deteriorate due to operator errors and accumulation of inaccuracies
Solution Approach 1:
The patent replaces manual mechanical measurement methods (rulers, physical trimming) with an optical measurement system using a laser rangefinder. The laser adapter couples to the GC instrument and automatically measures column length optically, eliminating manual intervention and associated errors while providing precise, repeatable measurements without requiring logbook maintenance.
2Measurement precision
If columns are physically manipulated for measurement, then length can be measured, but column integrity deteriorates due to damage to fragile columns
Solution Approach 1:
The patent replaces mechanical measurement approaches that require physical handling of the fragile capillary column with a non-contact optical measurement system. The laser rangefinder measures column length through optical means while the column remains installed in the GC instrument, completely eliminating mechanical stress, handling damage, and contamination risks.
3Device complexity
If nominal column dimensions from manufacturer are used, then device complexity is reduced, but measurement precision deteriorates due to manufacturing errors
Solution Approach 1:
The patent implements a self-measuring system where the GC instrument automatically determines its own column length using the integrated laser rangefinder. The system performs self-characterization without requiring external measurement tools, manual logging, or reliance on manufacturer nominal dimensions, thereby achieving high precision while maintaining operational 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
This approach allows for accurate and precise measurement of capillary column lengths, reducing errors and maintaining column integrity, thereby enhancing analytical reproducibility and instrument performance.
Implementation Method 1
A column used for gas chromatography (GC) is fabricated from a light guiding open tubular capillary. The light guiding capillary is suitable for transmission of optical frequencies employed in commercially available hand held digital range finders.
Data Source
AI summary
A column used for gas chromatography (GC) is fabricated from an open tubular light guiding capillary. The light guiding capillary is suitable for transmission of optical frequencies employed in commercially available hand held laser range finders.