Thermoanalysis Device with Real-Time Gas Analysis Control
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Solution Overview
Problem
Existing thermoanalysis methods face limitations in achieving a time- and temperature-resolved investigation of volatile components and decomposition products, particularly when multiple gases are liberated simultaneously, due to the time-consuming nature of gas analysis devices during temperature changes.
Innovation Solution
A device and method that implement a functional coupling between temperature regulation and gas investigation, using a control algorithm to detect gas liberation points in real-time, allowing for temporary interruption of temperature changes and controlled gas transfer to analysis devices, such as gas chromatographs with mass spectrometers, for precise analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas analysis is performed continuously during thermal analysis, then gas composition can be monitored, but the analysis is too time-consuming to achieve accurate time- and temperature-resolved results when multiple gases are liberated simultaneously
Solution Approach 1:
The patent implements periodic gas sampling at specific time intervals during thermal analysis, rather than continuous analysis. The gas sampling is synchronized with temperature stages, where gas is collected and analyzed at predetermined time points corresponding to specific temperature ranges. This periodic approach reduces the overall analysis time while maintaining sufficient resolution to distinguish between different gas liberation events occurring at different temperatures.
2Productivity
If temperature changes rapidly during thermal analysis, then analysis efficiency increases, but gas analysis accuracy decreases because gas liberation processes cannot be adequately resolved
Solution Approach 1:
The patent employs dynamic temperature programming where the heating rate is adjusted based on detected gas liberation events. When gas evolution is detected (through mass change or direct gas analysis), the heating rate is automatically reduced or paused to allow sufficient time for gas analysis. This dynamic adjustment of temperature change rate enables the system to maintain both productivity and measurement precision by adapting the heating speed to the actual sample behavior.
Solution Approach 2:
The system incorporates feedback mechanisms where gas analysis results and mass change data are continuously monitored and used to adjust the temperature program in real-time. When gas liberation is detected, the control system responds by modifying the heating rate or pausing temperature increase, ensuring that gas analysis can be performed at appropriate temperature stages. This closed-loop control allows the system to automatically optimize the balance between analysis speed and resolution.
3Loss of information
If gas sampling frequency is increased to capture all liberated gases, then gas analysis completeness improves, but the complexity of coordinating temperature regulation and gas analysis increases
Solution Approach 1:
The patent divides the thermal analysis process into discrete temperature stages or intervals, with gas sampling and analysis performed at each stage. Rather than attempting to analyze all gases continuously, the process is segmented into manageable segments corresponding to different temperature ranges where specific types of gas liberation are expected to occur. This segmentation simplifies the coordination between temperature control and gas analysis by creating distinct, manageable analysis windows.
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 enables a more accurate, time- and temperature-resolved analysis of gas composition, increasing the informative value and detail of thermoanalysis results, allowing for direct correlation of decomposition temperatures with gas analysis results without operator intervention.
Implementation Method 1
a mass detector is used to detect points in time at which gas is liberated from the sample
Implementation Method 2
a gas chromatograph for separating the different gases
Implementation Method 3
a mass spectrometer for analysing the separated gases
Data Source
AI summary
A thermoanalysis device, including a controllable temperature regulating device for the controlled change in the temperature of a sample to be investigated, a detection device for the continuous detection of at least one signal characteristic of a property of the sample during the change in the temperature, and a gas analysis device for investigating gases which are liberated from the sample. In order to enable an improved time- and temperature-resolved investigation of volatile components and decomposition products, provision is made according to the invention such that, during the change in the temperature of the sample, the temperature regulating device is controlled according to a control algorithm taking account of the detected signal and/or the gas analysis device is constituted so as to be controllable and is controlled according to a control algorithm taking account of the detected signal.