Substrate Fluid Heating Control Using Pressure-Temperature Feedback
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Solution Overview
Problem
Existing substrate processing technologies using supercritical fluids face challenges in efficiently controlling the temperature of the processing fluid, leading to instability and inefficiency in the processing chamber.
Innovation Solution
A substrate processing apparatus that includes a heating mechanism, a first temperature sensor, a pressure sensor, and a controller. The controller adjusts the output of the heating mechanism based on the pressure and temperature of the processing fluid, using a hypothetical temperature calculation to ensure precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature control is based only on temperature sensor feedback, then the control system is simple, but the temperature control accuracy deteriorates due to fluid state changes affecting sensor response
Solution Approach 1:
The system implements feedback control by continuously monitoring temperature with a temperature sensor and adjusting the heater output based on the detected temperature. This closed-loop feedback mechanism compensates for the inaccuracies caused by fluid state changes, maintaining accurate temperature control despite the complex supercritical fluid behavior.
Solution Approach 2:
The system changes the control parameter from direct temperature control to hypothetical temperature control. By calculating hypothetical temperature based on both temperature and pressure sensor readings and using this as the control target, the system compensates for measurement inaccuracies caused by fluid state changes, achieving more accurate temperature control.
2Device complexity
If temperature control is based only on temperature sensor, then the control mechanism is simple, but the temperature control stability deteriorates when fluid state changes
Solution Approach 1:
The system transitions from controlling based solely on temperature to controlling based on hypothetical temperature that incorporates both temperature and pressure parameters. This parameter change allows the control system to account for fluid state changes (supercritical, gaseous, liquid), maintaining temperature control stability across different operating conditions.
Solution Approach 2:
The dual-sensor feedback system continuously monitors both temperature and pressure, calculating hypothetical temperature to provide accurate feedback for heater control. This comprehensive feedback mechanism ensures stable temperature control even when the fluid transitions between different states during the drying process.
3Device complexity
If a single temperature sensor is used, then the device structure is simple, but the temperature control precision deteriorates due to unaccounted pressure effects
Solution Approach 1:
The system changes from single-parameter (temperature) control to two-parameter (temperature and pressure) control by introducing a pressure sensor. The hypothetical temperature calculation integrates both parameters, compensating for pressure effects on temperature measurement and achieving higher temperature control precision without significantly increasing device complexity.
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
The apparatus achieves stable and efficient temperature control of the processing fluid, ensuring that the fluid's temperature is consistently maintained at the set temperature, regardless of the fluid's state, thereby improving processing accuracy and efficiency.
Implementation Method 1
a heating mechanism configured to heat the processing fluid flowing through the supply flow path
Implementation Method 2
a pressure sensor configured to detect a pressure of the processing fluid downstream of the heating mechanism
Implementation Method 3
a first temperature sensor configured to detect a temperature of the processing fluid downstream of the heating mechanism
Data Source
AI summary
A substrate processing apparatus includes a processing chamber configured to accommodate a substrate; a supply flow path configured to supply a processing fluid into the processing chamber; a heating mechanism configured to heat the processing fluid flowing through the supply flow path; a first temperature sensor configured to detect a temperature of the processing fluid downstream of the heating mechanism; a pressure sensor configured to detect a pressure of the processing fluid downstream of the heating mechanism; and a controller. The controller controls an output of the heating mechanism based on the pressure of the processing fluid detected by the pressure sensor and the temperature of the processing fluid detected by the first temperature sensor.