Leveraging resonant frequencies of an optical cavity for spectroscopic measurement of gas temperature and concentration
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| Hauptverfasser: | , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Lisak, Daniel D'Agostino, Vittorio Wójtewicz, Szymon Cygan, Agata Gibas, Marcin Wcisło, Piotr Ciuryło, Roman Bielska, Katarzyna |
| author_facet | Lisak, Daniel D'Agostino, Vittorio Wójtewicz, Szymon Cygan, Agata Gibas, Marcin Wcisło, Piotr Ciuryło, Roman Bielska, Katarzyna |
| contents | We introduce a spectroscopic approach to primary gas thermometry, harnessing precise optical cavity resonance frequencies and ab initio molecular line intensity calculations. By utilizing CO (3-0) vibrational band lines and cavity mode dispersion spectroscopy, we achieve an uncertainty of 82 ppm (24 mK at 296 K) in line-intensity-ratio thermometry (LRT) - over an order of magnitude lower than any previously reported spectroscopic thermometry at gas pressures above 1.2 kPa. This method extends high-precision spectroscopic thermometry across a pressure range an order of magnitude larger than prior techniques, enabling a fully optical, non-contact, and molecule-selective primary amount-of-substance measurement. We further demonstrate sub-permille uncertainty in gas concentration measurements across pressures from 50 Pa to 20 kPa, significantly enhancing the precision and versatility of spectroscopic gas metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_17660 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Leveraging resonant frequencies of an optical cavity for spectroscopic measurement of gas temperature and concentration Lisak, Daniel D'Agostino, Vittorio Wójtewicz, Szymon Cygan, Agata Gibas, Marcin Wcisło, Piotr Ciuryło, Roman Bielska, Katarzyna Optics Applied Physics We introduce a spectroscopic approach to primary gas thermometry, harnessing precise optical cavity resonance frequencies and ab initio molecular line intensity calculations. By utilizing CO (3-0) vibrational band lines and cavity mode dispersion spectroscopy, we achieve an uncertainty of 82 ppm (24 mK at 296 K) in line-intensity-ratio thermometry (LRT) - over an order of magnitude lower than any previously reported spectroscopic thermometry at gas pressures above 1.2 kPa. This method extends high-precision spectroscopic thermometry across a pressure range an order of magnitude larger than prior techniques, enabling a fully optical, non-contact, and molecule-selective primary amount-of-substance measurement. We further demonstrate sub-permille uncertainty in gas concentration measurements across pressures from 50 Pa to 20 kPa, significantly enhancing the precision and versatility of spectroscopic gas metrology. |
| title | Leveraging resonant frequencies of an optical cavity for spectroscopic measurement of gas temperature and concentration |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2502.17660 |