First Calibration Measurements of an FTIR Absorption Spectroscopy System for Liquid Hydrogen Isotopologues for the Isotope Separation System of Fusion Power Plants

Gröβle, R.; Beck, A.; Bornschein, B.; Fischer, Sebastian; Kraus, A.; Mirz, Sebastian; Rupp, S.

doi:10.13182/fst14-t29

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…the investigation of molecular energy levels 1 or concentration measurements based on line intensities or absorbances. [2][3][4] An excellent overview of baseline-removal techniques is given by H. G. Schulze et al, 5 containing e.g. polynomial or spline approximation methods, band-pass filters or derivative methods.…”

Section: Introductionmentioning

confidence: 99%

“…Our application is the development of a real-time and inline measurement system for the concentration of liquid hydrogen isotopologues for the integration in a cryogenic distillation column in the fusion fuel cycle. 3,4,14 We use the original rolling circle filter and apply it on the FTIR spectra of liquid hydrogen isotopologues, which delivers a sufficient baseline-removal without the necessity of an additional Savitzky-Golay filter for the characteristic background curvatures and peak shapes of these spectra.…”

Section: Introductionmentioning

confidence: 99%

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Optimization and quantification of the systematic effects of a rolling circle filter for spectral pre-processing

Mirz

Groessle

Kraus

2019

Analyst

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization and quantification of the systematic effects of a rolling circle filter for spectral pre-processing

Mirz

Groessle

Kraus

2019

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Raman spectroscopy for ortho-para hydrogen catalyst studies

Krasch

Mirz

Smolinski

et al. 2023

International Journal of Hydrogen Energy

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Minimal and complete set of descriptors for IR-absorption spectra of liquid H2–D2 mixtures

et al. 2020

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The IR spectra of liquid hydrogen isotopologues (Q2 = H2, D2, T2, HD, HT, DT) are dominated by the interaction induced absorption. Therefore, the complexity tremendously increases with the number of different isotopologues in the sample. As we aim for a system independent calibration of IR absorption spectroscopy against all six isotopologues and three ortho–para ratios, we need a minimal and complete set of descriptors to predict the spectra and to decrease the needed calibration effort. For this, we grouped the absorption lines into three groups: absorption on monomers, phonons, and molecular dimers. In particular, molecular dimers contribute to the absolute number of absorption lines in the spectra of mixed isotopologues. To develop and test the set of descriptors, we make use of three spectra: a pure H2 sample, a pure D2 sample, and a mixed H2–D2 sample. We show a detailed analysis of these three spectra in the first and second vibrational branch in the range from 2000 cm−1 to 9000 cm−1. The set of descriptors found within this work can be used to identify and predict all lines in this range for liquid H2–D2mixtures.

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First Calibration Measurements of an FTIR Absorption Spectroscopy System for Liquid Hydrogen Isotopologues for the Isotope Separation System of Fusion Power Plants

Cited by 7 publications

References 8 publications

Optimization and quantification of the systematic effects of a rolling circle filter for spectral pre-processing

Optimization and quantification of the systematic effects of a rolling circle filter for spectral pre-processing

Raman spectroscopy for ortho-para hydrogen catalyst studies

Minimal and complete set of descriptors for IR-absorption spectra of liquid H2–D2 mixtures

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