Source Vessel Inlet Tube Layout for Accurate Liquid Level Sensing
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Solution Overview
Problem
Conventional systems for refilling source vessels in semiconductor fabrication cause false sensor readings due to direct liquid spray and splash, leading to inaccurate liquid level detection.
Innovation Solution
An apparatus with an inlet tube that directs liquid flow onto the sidewall of the source vessel, preventing direct impact on the sensor and minimizing splash, using a curved or bent design to control the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet tube directs liquid directly into the source vessel, then the refill process is simple and fast, but the liquid spray and splash cause false sensor readings
Solution Approach 1:
The patent introduces an intermediary structure (the specially positioned inlet tube extending to the bottom of the source vessel) that mediates between the liquid supply and the sensor. The inlet tube acts as a conduit that delivers liquid to the bottom without allowing direct spray or splash to reach the sensor, thus preserving measurement precision while maintaining refill productivity.
Solution Approach 2:
The patent changes the spatial dimension of liquid delivery by extending the inlet tube vertically to the bottom of the source vessel rather than delivering liquid from above. This dimensional change allows liquid to enter from the bottom and rise naturally, preventing spray and splash from reaching the sensor positioned above, thus resolving the contradiction between fast refill and accurate measurement.
2Reliability
If the inlet tube extends deeper into the source vessel to prevent spray, then false readings are reduced, but the risk of liquid splashing increases
Solution Approach 1:
The inlet tube serves as an intermediary that delivers liquid to the bottom of the source vessel in a controlled manner. By positioning the inlet tube opening at the bottom, the liquid enters gently and rises naturally, preventing both direct spray to the sensor and excessive splashing that would occur with top-down delivery.
3Measurement precision
If a sensor is placed within the source vessel to detect liquid level, then accurate level detection is achieved, but the sensor becomes vulnerable to liquid spray and splash
Solution Approach 1:
The patent changes the spatial relationship between the liquid delivery path and the sensor by extending the inlet tube to the bottom of the source vessel. This allows the sensor to remain positioned within the vessel for accurate measurement while the liquid enters from the bottom and rises, preventing direct spray or splash impact on the sensor.
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 false sensor readings by ensuring accurate liquid level detection during refill, maintaining system reliability and precision in semiconductor processing.
Implementation Method 1
an inlet tube for flowing the liquid into the source vessel. The inlet tube may extend into the source vessel and may be arranged to direct the flowing liquid onto a sidewall of the source vessel
Data Source
AI summary
An apparatus capable of controlling a liquid may provide a source vessel to contain the liquid and an inlet tube for flowing the liquid into the source vessel. The inlet tube may extend into the source vessel and may be arranged to direct the flowing liquid onto a sidewall of the source vessel.