Optical Emission Spectrometer Thermal Drift Compensation
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Solution Overview
Problem
Optical emission spectrometers face complex and time-consuming alignment procedures due to thermal expansion caused by heat transfer from the plasma stand to the optical system, leading to potential misalignment and reduced spectral resolution.
Innovation Solution
A direct and fixed connection between the plasma stand and optical system, with thermal expansion compensation by an analyzing unit, and non-adjustable mounting means to ensure constant alignment, preventing alignment errors and drifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermal insulation is implemented between plasma stand and optical system, then thermal expansion is reduced, but device complexity increases
Solution Approach 1:
A flange connection system acts as an intermediary between the plasma stand and optical system, providing both mechanical support and thermal isolation. The flange serves as a mediator that transfers mechanical loads while blocking thermal pathways, thus stabilizing the optical system without requiring complex insulation structures.
Solution Approach 2:
The system is divided into separate modular components (plasma stand, flange, optical system) that can be independently adjusted and aligned. This segmentation allows thermal isolation between components while maintaining precise optical alignment through individual adjustment mechanisms.
2Adaptability or versatility
If plasma stand and optical system are designed as separate adjustable units, then alignment flexibility is improved, but adjustment complexity increases
Solution Approach 1:
The flange connection system incorporates dynamic adjustment capabilities that allow the optical system to be positioned and oriented relative to the plasma stand. Once aligned, the connection becomes fixed, providing stability during operation. This dynamic adjustment during setup followed by fixed operation reduces complexity while maintaining flexibility.
3Measurement precision
If direct view light path is used, then spectral range is extended, but alignment precision requirements increase
Solution Approach 1:
The flange connection system is designed with pre-established mechanical reference surfaces and alignment features that guide the optical system into proper alignment with the plasma stand. This preliminary mechanical alignment reduces the precision requirements for subsequent optical adjustments and ensures consistent alignment during operation.
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
This approach minimizes adjustment effort while maintaining high spectral resolution and robust performance over time, eliminating the need for intricate alignment procedures and ensuring consistent results.
Implementation Method 1
compensate for a drift of the spectrum relative to the detector caused by heat transferred from the plasma stand to the optical system considering the thermal expansion of the optical system
Data Source
AI summary
The invention relates to an optical emission spectrometer (1) being easily adjustable, and to a method (100) to set-up and operate such a spectrometer (1) comprising a plasma stand (2) to establish a light emitting plasma from sample material, and an optical system (3) to measure the spectrum of the light (L) emitted by the plasma being characteristic to the sample material, where the optical system (3) comprises at least one light entrance aperture (31), at least one diffraction grating (32) to split up the light (L) coming from the plasma (A) and one or more detectors (33) to measure the spectrum of the light (L), wherein the plasma stand (2) and the optical system (3) are directly and fixedly mounted on respective a plasma stand flange (2B) and an optical system flange (3B) which are directly and fixedly connected to each other and wherein the optical emission spectrometer (1) further comprises an analyzing unit (34) adapted to analyze the measured spectrum and to compensate for a drift of the spectrum relative to the detector (33) potentially caused by heat transferred from the plasma stand (2) to the optical system (3) considering the thermal expansion of the optical system (3).