Wireless RF Sensor Hub for Real-Time Reactor Chamber Monitoring
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Solution Overview
Problem
In reactor chambers for processing workpieces, it is challenging to monitor internal conditions in real-time due to the need for sensors to be accessible to signal-carrying wires without interfering with plasma processing, preventing effective feedback control of process parameters.
Innovation Solution
Implementing wireless sensors distributed across the chamber's internal surfaces with a radio frequency (RF) communication hub to establish independent communication channels with a process controller outside the chamber, allowing for real-time measurement communication and feedback control of process parameters such as AC heater power, RF power, coolant flow rate, and electrostatic chucking voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed inside the chamber with wire access, then real-time monitoring is enabled, but sensor placement is restricted and plasma processing may be interfered with
Solution Approach 1:
The patent replaces wired mechanical connections with wireless RF communication. Sensors communicate chamber conditions to the process controller via RF signals instead of physical wires, eliminating the need for wire access holes and allowing flexible sensor placement on any internal surface without compromising plasma processing integrity.
2Reliability
If the chamber is vacuum-sealed during processing, then plasma processing quality is maintained, but sensor signal communication becomes difficult
Solution Approach 1:
The patent introduces RF waves as an intermediary carrier to transmit sensor data through the vacuum-sealed chamber. The RF communication system acts as a mediator that can penetrate or pass through the chamber structure, allowing information transmission without breaking the vacuum seal, thus maintaining both plasma processing quality and sensor communication.
3Measurement precision
If multiple sensors are distributed across chamber surfaces, then comprehensive monitoring is achieved, but wire management complexity increases
Solution Approach 1:
The patent replaces the mechanical wire management system with wireless RF communication. Instead of routing multiple wires from numerous sensors to the controller, each sensor independently transmits data via RF signals, dramatically simplifying the system architecture and eliminating wire management complexity while enabling comprehensive multi-point monitoring.
4Reliability
If sensors are positioned to avoid plasma interference, then plasma processing is protected, but monitoring coverage is reduced
Solution Approach 1:
The patent uses wireless RF sensors that can be positioned anywhere on internal surfaces without requiring physical connections that would interfere with plasma. The RF communication capability allows sensors to be placed in optimal monitoring locations while maintaining plasma processing integrity, as no wires or physical penetrations are needed.
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 real-time feedback control of chamber conditions, allowing for precise adjustment of process parameters, even when the chamber is sealed, and allows sensors to be placed freely without wire access restrictions, enhancing the monitoring and control of a wide range of chamber conditions.
Implementation Method 1
providing a radio frequency (RF) communication hub inside the chamber and establishing respective independent RF communication channels between respective ones of the sensors and the RF communication hub
Data Source
AI summary
Plural sensors on an interior surface of a reactor chamber are linked by respective RF communication channels to a hub inside the reactor chamber, which in turn is linked to a process controller outside of the chamber.