Field Flow Fractionator Pressure Control for Stable Detector Flow
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Solution Overview
Problem
Current technologies fail to accurately regulate detector flow in field flow fractionators, leading to inconsistencies in channel pressure and flow rate, which affects the measurement of recovered mass and sample analysis accuracy.
Innovation Solution
The apparatus and method involve a detector flow meter, channel pressure meter, and control valves to maintain a consistent detector flow rate by adjusting channel pressure, using a computer system to monitor and actuate the valves based on measured data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current technologies are used to measure detector flow, then the system structure remains simple, but the flow regulation accuracy deteriorates leading to inconsistencies in channel pressure and flow rate
Solution Approach 1:
The patent implements a feedback control system where the detector flow meter continuously measures the actual detector flow and feeds this information back to the control valve. The control valve adjusts the channel pressure based on the difference between the measured flow and the desired flow rate, creating a closed-loop system that maintains accurate flow regulation despite variations in system conditions.
Solution Approach 2:
The patent introduces a channel pressure meter as an intermediary measurement device that indirectly monitors the detector flow conditions. By measuring channel pressure and using this information to control the valve position, the system achieves better flow regulation accuracy without directly measuring flow at every point, thus managing system complexity while improving precision.
2Reliability
If no active pressure control is implemented, then the device complexity remains low, but the flow rate consistency deteriorates affecting mass recovery accuracy
Solution Approach 1:
The control valve receives feedback from the detector flow meter and automatically adjusts its position to maintain consistent detector flow rate. This feedback mechanism ensures that variations in channel pressure or flow conditions are compensated in real-time, significantly improving flow rate consistency and reliability of mass recovery measurements.
Solution Approach 2:
The system implements self-regulation where the control valve automatically adjusts channel pressure in response to flow variations without requiring external intervention. The detector flow meter continuously monitors the actual flow and the control system autonomously makes corrections, enabling the system to maintain reliable operation through self-correcting mechanisms.
Data Source
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AI summary
The present disclosure describes an apparatus, method, and system of regulating a detector flow of a field flow fractionator. In an embodiment, the apparatus includes (1) a detector flow meter, where the detector flow meter is configured to measure a detector flow from the field flow fractionator, (2) a channel pressure meter, where the channel pressure meter is configured to measure a channel pressure of the field flow fractionator, (3) at least one control valve, where an inlet of the at least one control valve is connected to an outlet of the channel pressure meter, (4) where the detector flow meter is configured to set a channel pressure set point of the channel pressure meter, and (5) where the channel pressure meter is configured to actuate the at least one control valve to maintain a channel pressure of the field flow fractionator at the channel pressure set point.