Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation
We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. Prior to the me...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-01-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/26/3/609 |
| _version_ | 1797407792827465728 |
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| author | Jesper B. Christensen David Balslev-Harder Lars Nielsen Jan C. Petersen Mikael Lassen |
| author_facet | Jesper B. Christensen David Balslev-Harder Lars Nielsen Jan C. Petersen Mikael Lassen |
| author_sort | Jesper B. Christensen |
| collection | DOAJ |
| description | We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. Prior to the measurements, the photoacoustic sensor system was pre-calibrated using CO<sub>2</sub> mole fractions in the range of 0–10<sup>−3</sup> (0–1000 ppm) and at different relative humidities between 0% and 45%, while assuming a model hypothesis that allowed the photoacoustic signal to be perturbed linearly by H<sub>2</sub>O content. This calibration technique was compared against an alternative learning-based method, where sensor data from the first two days of the six-day period were used for self-calibration. A commercial non-dispersive infrared sensor was used as a CO<sub>2</sub> reference sensor and provided the benchmark for the two calibration procedures. In our case, the self-calibrated method proved to be both more accurate and precise. |
| first_indexed | 2024-03-09T03:46:47Z |
| format | Article |
| id | doaj.art-c8cef0b802a743e89933f3695c530edf |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T03:46:47Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-c8cef0b802a743e89933f3695c530edf2023-12-03T14:33:04ZengMDPI AGMolecules1420-30492021-01-0126360910.3390/molecules26030609Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life AdaptationJesper B. Christensen0David Balslev-Harder1Lars Nielsen2Jan C. Petersen3Mikael Lassen4Danish Fundamental Metrology, Kogle Allé 5, 2970 Hørsholm, DenmarkDanish Fundamental Metrology, Kogle Allé 5, 2970 Hørsholm, DenmarkDanish Fundamental Metrology, Kogle Allé 5, 2970 Hørsholm, DenmarkDanish Fundamental Metrology, Kogle Allé 5, 2970 Hørsholm, DenmarkDanish Fundamental Metrology, Kogle Allé 5, 2970 Hørsholm, DenmarkWe report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. Prior to the measurements, the photoacoustic sensor system was pre-calibrated using CO<sub>2</sub> mole fractions in the range of 0–10<sup>−3</sup> (0–1000 ppm) and at different relative humidities between 0% and 45%, while assuming a model hypothesis that allowed the photoacoustic signal to be perturbed linearly by H<sub>2</sub>O content. This calibration technique was compared against an alternative learning-based method, where sensor data from the first two days of the six-day period were used for self-calibration. A commercial non-dispersive infrared sensor was used as a CO<sub>2</sub> reference sensor and provided the benchmark for the two calibration procedures. In our case, the self-calibrated method proved to be both more accurate and precise.https://www.mdpi.com/1420-3049/26/3/609photoacousticsgas spectroscopyenvironmental sensorscarbon dioxidehumidityoptics |
| spellingShingle | Jesper B. Christensen David Balslev-Harder Lars Nielsen Jan C. Petersen Mikael Lassen Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation Molecules photoacoustics gas spectroscopy environmental sensors carbon dioxide humidity optics |
| title | Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation |
| title_full | Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation |
| title_fullStr | Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation |
| title_full_unstemmed | Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation |
| title_short | Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation |
| title_sort | calibration of quartz enhanced photoacoustic sensors for real life adaptation |
| topic | photoacoustics gas spectroscopy environmental sensors carbon dioxide humidity optics |
| url | https://www.mdpi.com/1420-3049/26/3/609 |
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