Gas Analyzer Plasma Cleaning for Insulating Deposit Buildup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas analyzers used in semiconductor manufacturing processes face challenges in maintaining accuracy and durability due to deposition of insulating films and oxides, which impair potential distribution and functionality, especially in environments with silicon-based gases.
Innovation Solution
A gas analyzer apparatus with a plasma cleaning function, utilizing a control unit to set cleaning potentials for drawing in plasma for cleaning purposes, including the use of a plasma generation unit to generate cleaning plasma, which can be either ground or negative potential, to effectively remove deposits from the ionization, filter, and detector units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas analyzer operates continuously in semiconductor manufacturing environments, then monitoring capability is maintained, but insulating films and oxides deposit on internal components, impairing potential distribution and functionality
Solution Approach 1:
The system performs preliminary cleaning actions by applying cleaning potentials to components before deposits significantly impair functionality. The control unit monitors operational time and automatically applies cleaning potentials to the ionization unit, filter unit, and detector unit to prevent insulating film accumulation that would otherwise degrade monitoring capability.
Solution Approach 2:
The gas analyzer implements periodic cleaning cycles where the control unit alternates between normal monitoring mode and cleaning mode. During cleaning mode, cleaning potentials are applied to components for a predetermined time period, then the system returns to monitoring mode. This periodic action prevents deposit accumulation while maintaining continuous monitoring capability.
2Reliability
If cleaning potentials are applied frequently to remove deposits, then functionality is maintained, but energy consumption increases
Solution Approach 1:
The control unit incorporates feedback mechanisms that monitor operational time, detected gas concentrations, and cleaning effectiveness. Based on this feedback, the system dynamically adjusts the frequency and duration of cleaning potential application, applying cleaning only when necessary to maintain functionality while minimizing energy consumption from excessive cleaning cycles.
Solution Approach 2:
The system applies cleaning potentials at partial intervals rather than continuously or at every operational cycle. The control unit determines optimal cleaning timing based on operational duration and detected deposit levels, applying cleaning action only when it becomes necessary to maintain functionality, thereby reducing overall energy consumption while preserving reliability.
3Reliability
If cleaning potentials are applied to all components including the housing, then cleaning effectiveness is improved, but the risk of damage to sensitive components increases
Solution Approach 1:
The system applies cleaning potentials selectively to specific components based on their individual cleaning needs and sensitivity to electrical stress. The control unit applies cleaning potentials to the ionization unit, filter unit, and detector unit at different times or with different potential levels, rather than applying uniform high potentials to all components simultaneously, thereby maintaining cleaning effectiveness while reducing damage risk to sensitive elements.
Solution Approach 2:
The control unit applies cleaning potentials in a controlled sequence that cushions sensitive components from excessive electrical stress. By applying potentials gradually and in predetermined sequences rather than simultaneously at maximum levels, the system prevents sudden electrical shocks that could damage sensitive components while still achieving effective cleaning of all surfaces including the housing.
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 plasma cleaning function ensures the gas analyzer apparatus remains functional and accurate by regularly removing insulating deposits, maintaining optimal potential distribution and extending the apparatus' durability and monitoring capabilities in diverse gas environments.
Implementation Method 1
a plasma generation unit that generates plasma; a cleaning control unit that draws in the generated plasma and controls the plasma cleaning
Implementation Method 2
a control unit that controls respective potentials of the filter unit, the detector unit, and the housing. The cleaning control unit sets the respective potentials of the filter unit, the detector unit, and the housing to cleaning potentials for drawing in, as plasma for cleaning purposes
Data Source
AI summary
There is provided a gas analyzer apparatus that analyzes inflowing sample gas. The gas analyzer apparatus includes a filter unit that filters the sample gas, a detector unit that detects the result of filtering, a housing that houses these elements, and a control unit that controls the respective potentials of these elements. The control unit includes a cleaning control unit that sets the respective potentials of the filter unit, the detector unit, and the housing to cleaning potentials that draws in, as plasma for cleaning purposes, process plasma from a source that supplies the sample gas or plasma generated by a plasma generation unit.