Optical detection of formaldehyde in air in the 3.6 µm range
The optical detector of formaldehyde designed for sensing cancer biomarkers in air exhaled from human lungs with possible application in free atmosphere is described. The measurements were performed at wavelengths ranging from 3595.77-3596.20 nm. It was stated that at the pressure of 0.01 atm this a...
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| Published in | Biomedical optics express Vol. 11; no. 12; pp. 7019 - 7031 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
Optical Society of America
01.12.2020
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| Online Access | Get full text |
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| Summary: | The optical detector of formaldehyde designed for sensing cancer biomarkers in air exhaled from human lungs with possible application in free atmosphere is described. The measurements were performed at wavelengths ranging from 3595.77-3596.20 nm. It was stated that at the pressure of 0.01 atm this absorption band exhibits the best immunity to typical interferents that might occur at high concentration in human breath. Multipass absorption spectroscopy was also applied. The method of optical fringes quenching by wavelength modulation and signal averaging over the interferences period was presented. The application of such approaches enabled the detection limit of about single ppb to be achieved. |
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| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 2156-7085 2156-7085 |
| DOI: | 10.1364/BOE.405384 |