Gas Supply Line Solid Formation Detection
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Solution Overview
Problem
The gas supply system in substrate processing apparatuses can suffer from gas reactions leading to solid formation within the supply line or introduction port, affecting the responsiveness of the processing gas and ultimately the substrate processing results, necessitating an effective inspection method to detect such issues.
Innovation Solution
A method involving a pressure sensor and exhaust device to monitor pressure changes in the gas supply line after stopping gas supply, comparing decrease rates to determine if solids have formed within the line or introduction port, and checking for leaks in control valves, allowing for inspection of the gas supply system's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vaporizer is used to generate processing gas by vaporizing liquid, then the gas supply system can provide processing gas to the chamber, but gas reactions may occur leading to solid formation within the supply line or introduction port, affecting responsiveness
Solution Approach 1:
The inspection method is performed before substrate processing to detect solid formation in advance. By monitoring pressure changes and calculating decrease rates before actual processing, the system can identify potential blockages and address them preemptively, preventing disruptions during critical processing operations.
Solution Approach 2:
The system continuously monitors pressure in the gas supply line using a pressure sensor and provides feedback by calculating the pressure decrease rate. This feedback mechanism allows real-time detection of solid formation conditions, enabling the system to respond to changes in gas flow characteristics and alert operators to potential issues.
2Ease of operation
If the gas supply line is long or has complex routing, then the gas can reach the chamber effectively, but solids are more likely to form and accumulate, affecting gas flow responsiveness
Solution Approach 1:
The patent replaces direct mechanical inspection methods with a pressure-based monitoring system. Instead of physically examining the gas supply line for solids, the system uses pressure sensors and computational analysis of pressure decrease rates to detect solid formation, providing a non-intrusive inspection method that maintains system integrity.
Solution Approach 2:
The pressure sensor acts as an intermediary between the gas supply line and the detection system. Rather than directly observing solids in the line, the sensor measures pressure changes caused by solid formation, translating physical blockages into measurable electrical signals that can be analyzed computationally.
3Reliability
If inspection methods are added to detect solid formation, then system reliability can be improved, but device complexity increases
Solution Approach 1:
The gas supply system performs self-inspection by monitoring its own pressure characteristics. The pressure sensor and decrease rate calculation enable the system to detect solid formation using its existing operational parameters, eliminating the need for separate, complex external inspection equipment and reducing overall system complexity.
Solution Approach 2:
The pressure monitoring system serves multiple functions: it monitors gas flow during normal operation, detects solid formation through pressure decrease rate analysis, and provides data for determining the location of solids. This multi-functionality reduces the need for separate specialized inspection devices, simplifying the overall system architecture.
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
Enables accurate detection of solid formation within the gas supply line or introduction port, determining the cause of responsiveness changes and potential leaks, thereby ensuring the integrity and performance of the gas supply system.
Implementation Method 1
a pressure sensor configured to obtain a measurement value of a pressure of the gas supply line
Implementation Method 2
the gas supply line is exhausted by the exhaust device
Implementation Method 3
The vaporizer is configured to generate a processing gas by vaporizing a liquid
Data Source
AI summary
In one embodiment, a vaporizer is connected to a chamber of a substrate processing apparatus through a gas supply line and a gas introduction port. An exhaust device is connected to the gas supply line. The substrate processing apparatus includes a pressure sensor that obtains a measurement value of a pressure of the gas supply line. A method according to the embodiment includes supplying a processing gas to the chamber from the vaporizer through the gas supply line, and monitoring a change of the measurement value obtained by the pressure sensor in a state in which supply of the processing gas to the gas supply line is stopped.