Endpoint Detection in Capillary Flow Control Systems
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Solution Overview
Problem
Capillary-assisted flow control systems in semiconductor manufacturing face economic disadvantages due to sudden unanticipated exhaustion of fluid supplies, leading to operational disruptions and waste in tools like ion implanters.
Innovation Solution
A method and apparatus for endpoint determination in capillary-assisted flow control systems, using a static flow restricting device and a selectively actuatable valve element to monitor characteristics such as fluid flow rate, pressure, or weight, generating a control signal to terminate fluid supply when an endpoint is reached, and optionally incorporating buffering reservoirs and mass flow controllers to manage fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capillary-assisted flow control is used to supply fluid, then fluid flow control is achieved, but sudden unanticipated exhaustion of fluid supply occurs causing operational disruption
Solution Approach 1:
The system performs preliminary actions by monitoring fluid supply characteristics (pressure, flow rate, weight) before complete exhaustion occurs. The endpoint detection system tracks these parameters continuously and triggers a warning or automatic shutdown before the fluid supply is completely depleted, preventing operational disruption while maintaining capillary-assisted flow control benefits
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring fluid supply characteristics and comparing them against predetermined thresholds. When the monitored parameters indicate approaching exhaustion (such as pressure drop, flow rate reduction, or weight change), the system provides feedback signals to alert operators or automatically adjust flow control, ensuring continuous reliable operation
2Reliability
If fluid supply is monitored to determine endpoint, then operational disruption is prevented, but system complexity increases
Solution Approach 1:
The system achieves multi-functionality by using a single monitoring apparatus that can detect multiple fluid supply characteristics (pressure, flow rate, weight) through different measurement modes. This universal monitoring system can adapt to different fluid types and supply configurations without requiring separate dedicated sensors for each parameter, thereby reducing overall system complexity while maintaining high reliability
Solution Approach 2:
The system simplifies complexity by monitoring changes in physical parameters (pressure differential, flow rate variations, weight change) rather than requiring direct measurement of fluid volume or composition. These parameter changes provide indirect but reliable indication of fluid supply status, enabling endpoint detection with simpler, more robust sensing equipment
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
Prevents sudden exhaustion of fluid supplies by enabling controlled cessation of fluid discharge, reducing operational disruptions and extending the operational lifetime of fluid supply vessels through accurate endpoint detection and buffering capabilities.
Implementation Method 1
capillary-assisted flow control
Data Source
AI summary
Apparatus and method for determining endpoint of a fluid supply vessel in which fluid flow is controlled through a flow passage disposed in an interior volume of the fluid supply vessel with a static flow restricting device and a selectively actuatable valve element upon establishing fluid flow. The endpoint determination can be employed to terminate fluid supply from the fluid supply vessel and/or to switch from a fluid-depleted supply vessel to a fresh vessel for continuity or renewal of fluid supply operation. The apparatus and method are suitable for use with fluid-utilizing apparatus such as ion implanters.