Spark Spectrometer Carbon Measurement Correction
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Solution Overview
Problem
Spark spectrometry inaccurately measures carbon in alloys when it is present in elemental form, as the pre-sparking phase removes elemental carbon, leading to falsified measurements and the need for costly alternative methods like controlled combustion analysis.
Innovation Solution
Record the intensity signal for carbon during the pre-sparking phase and correct the measurement by accounting for sublimed carbon, using specific wavelengths like 148.176 nm and monitoring the iron signal to determine the point of stable sublimation, allowing for precise calculation of the carbon fraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pre-sparking phase is used to homogenize sample surface, then measurement homogeneity is improved, but elemental carbon is removed by sublimation causing measurement inaccuracy
Solution Approach 1:
The patent applies preliminary action by recording the carbon signal intensity during the pre-sparking phase before the actual measurement. This allows the system to capture and account for the carbon that will be removed by sublimation, enabling correction of the final measurement to achieve accurate carbon content determination.
Solution Approach 2:
The patent implements feedback by using the carbon signal recorded during pre-sparking as a correction factor for the final measurement. The system continuously monitors carbon intensity during pre-sparking, feeds this information back into the calculation process, and adjusts the final carbon content determination accordingly to compensate for sublimation losses.
2Productivity
If conventional spark spectrometry is used for carbon measurement, then measurement speed is improved, but measurement accuracy deteriorates when carbon is in elemental form
Solution Approach 1:
The patent applies preliminary action by recording the carbon signal intensity during the pre-sparking phase before the actual measurement. This allows the system to capture and account for the carbon that will be removed by sublimation, enabling correction of the final measurement to achieve accurate carbon content determination.
Solution Approach 2:
The patent implements feedback by using the carbon signal recorded during pre-sparking as a correction factor for the final measurement. The system continuously monitors carbon intensity during pre-sparking, feeds this information back into the calculation process, and adjusts the final carbon content determination accordingly to compensate for sublimation losses.
3Measurement precision
If alternative combustion analysis method is used to achieve accurate carbon measurement, then measurement accuracy is improved, but cost and time consumption increase
Solution Approach 1:
The patent applies self-service by enabling the spark spectrometer to perform accurate carbon measurements using its own existing pre-sparking phase, without requiring external combustion analysis equipment or additional time-consuming procedures. The system uses its pre-sparking carbon signal to self-correct its measurements, making the process both accurate and efficient.
Solution Approach 2:
The patent applies parameter changes by utilizing the carbon signal parameter recorded during the pre-sparking phase as a correction factor. By changing how this parameter is used (from being discarded to being applied as a correction), the system achieves accurate carbon measurements while maintaining the speed advantage of spark spectrometry.
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 method enables accurate measurement of carbon in alloys with elemental form, reducing errors and costs by correcting for sublimed carbon, achieving results comparable to combustion analysis with improved repeatability and precision.
Implementation Method 1
An electrical discharge is produced which vaporises part of the sample and generates a plasma. In this plasma, the atoms of the sample are excited and produce emission lines
Implementation Method 2
An electrical discharge is produced which vaporises part of the sample
Implementation Method 3
each spark melts the surface of the sample around its point of impact to a radius of a few tens of micrometers
Implementation Method 4
the pre-sparks prefer to attack the grain boundaries of these precipitates. In the case of carbon, this results in the elemental carbon being sublimed and removed from the sample
Data Source
AI summary
A method of determining the carbon content of an iron alloy may include starting of the measurement of a sample in a spark spectrometer, creation of a plasma in a pre-sparking phase, detection and recording of an intensity signal for the carbon, calculation and cutting out of an unstable plasma phase, calculation of an excessive rise in the carbon signal, and calculation of the content of dissolved and undissolved carbon.