Flow Cell Optical Switching via Movable Reference Material
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Solution Overview
Problem
Existing optical switching methods for measuring solute concentration in fluids are prone to errors due to external optical component changes, such as reflectivity variations in mirrors, which are difficult to compensate for, and require cumbersome calibration procedures that disrupt measurement efficiency.
Innovation Solution
A flow cell system that switches between measurement states by adjusting the amount of reference material within the cell, eliminating the need for external optical component movement and reducing exposure to contamination, using a chemically stable material like sapphire or quartz for the reference material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external optical components (mirrors) are used for optical switching, then the measurement can be performed, but measurement precision deteriorates due to reflectivity variations and contamination
Solution Approach 1:
The patent extracts the optical switching function from external mirrors and relocates it within the flow cell using a movable reference material. This removes the source of contamination and reflectivity variations from the optical path, directly resolving the measurement precision deterioration caused by external component degradation.
Solution Approach 2:
The patent introduces a movable reference material (such as a transparent rod or block) as an intermediary element within the flow cell. This reference material serves as a stable, controllable optical element that can be positioned to switch between measurement states without the instability of external mirrors, thereby maintaining measurement precision.
2Adaptability or versatility
If external optical components are used for switching, then the system can switch between measurement states, but device complexity increases due to multiple mirrors and alignment requirements
Solution Approach 1:
The patent merges the optical switching function with the flow cell structure by incorporating a movable reference material directly into the flow cell chamber. This integration eliminates the need for separate external mirrors and alignment mechanisms, reducing device complexity while maintaining the ability to switch between measurement states.
3Measurement precision
If calibration procedures are performed frequently to compensate for component changes, then measurement precision is maintained, but productivity decreases due to measurement interruptions
Solution Approach 1:
The patent implements a movable reference material that can be positioned in advance to compensate for optical drift and component variations before they affect measurements. This proactive approach maintains measurement precision without requiring frequent calibration interruptions, thereby preserving continuous measurement productivity.
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 minimizes measurement errors by maintaining consistent optical properties over time and allows for continuous concentration measurements without the need for frequent calibration, enhancing the efficiency and accuracy of solute concentration analysis.
Implementation Method 1
A light source generates a beam of light which is directed by a first lens and passes through either a reference fluid or the fluid sample
Implementation Method 2
the flow cell body including opposing surfaces each having at least one transparent portion thereof, wherein an optical path for light to traverse through the flow cell body is defined in part by the transparent portions
Implementation Method 3
a switching mechanism operative to adjust an amount of the reference material deployed in the optical path to effect switching of the flow cell between a reference measurement state corresponding to a first light intensity measurement, and a fluid sample measurement state corresponding to a second light intensity measurement
Data Source
AI summary
A flow cell analyzes a fluid sample. A flow cell body contains a reference material and includes at least one hollow chamber to contain the fluid sample. Opposing surfaces of the flow cell body each have at least one transparent portion thereof. An optical path for light traversing through the flow cell body is defined in part by the transparent portions. A switching mechanism adjusts the amount of the reference material in the optical path to effect switching of the flow cell between a reference measurement state and a fluid sample measurement state. The reference measurement state corresponds to a first light intensity measurement and the fluid sample measurement state corresponds to a second light intensity measurement.