Descripción del proyecto
Mejorar la precisión de las mediciones de temperatura en dispositivos de fusión
La fusión ocurre cuando la materia se calienta a temperaturas extremadamente elevadas y partículas muy energéticas chocan. Los dispositivos de fusión apoyan los experimentos científicos básicos y también podrían producir enormes cantidades de energía sin emisiones. En la actualidad hay más de ciento treinta en el mundo, en fases que van de la planificación al funcionamiento. Garantizar una alta potencia y un funcionamiento seguro depende, en parte, de las cámaras de infrarrojos para vigilar y controlar los componentes orientados al plasma, pero es difícil obtener mediciones precisas de la temperatura. Con el apoyo de las Acciones Marie Skłodowska-Curie, el equipo del proyecto MAGRITTE desarrollará un gemelo digital de la máquina y un algoritmo de optimización, para comparar las imágenes reales con las predichas y determinar la temperatura real cuando las imágenes que producen coincidan.
Objetivo
Infrared (IR) cameras are key diagnostics to monitor and control plasma-facing components (PFCs) in fusion devices. Nevertheless, the use of all-metallic PFCs with low and variable emissivity (ε ~ 0.1-0.5) makes it difficult to obtain a correct surface temperature measurement. The radiance collected by the IR camera includes both the thermal radiation emitted by the target and parasitic radiation coming from the target's surroundings. Furthermore, target emissivity changes with the surface temperature and roughness. This causes significant errors in the surface temperature measurement that we need to address for achieving high power and safe plasma operation. Inaccurate interpretation of IR temperature measurement could endanger machine safety (temperature underestimation) or on the contrary, lead to unnecessary pulse interruptions that reduce the overall performance of the machine (temperature overestimation). The current approach is to convert the radiance collected by each pixel in an apparent using a physical relationship between emitted radiance and temperature (Planck’s law). Because a portion of the collected radiance is due to reflection on the target, a systematic error is made. This method is unable to recover the portion of reflected radiance and to deduce the correct temperature of the target using only the emitted radiance. The proposed technique in this project is to use a digital twin of the machine and to make in it assumptions on the temperatures of the different elements of the machine in order to simulate the images that would be measured under these supposed conditions. By comparing to the real image measured by the camera and using optimization techniques, the assumptions on the parameters can be updated until the simulated and measured images are close enough. It is then deduced that the assumptions made on the parameters of the digital twin are correct and that they correspond to the real temperatures in the machine.
Ámbito científico
Palabras clave
Programa(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régimen de financiación
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinador
1000 Ljubljana
Eslovenia