Open AccessOptical detection of formaldehyde in air in the 3.6 µm range
Author(s) -
Mateusz Winkowski,
T. Stacewicz
Publication year - 2020
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.405384
Subject(s) - materials science , detection limit , optics , absorption (acoustics) , breath gas analysis , formaldehyde , wavelength , detector , absorption spectroscopy , spectroscopy , optoelectronics , parts per notation , chemistry , physics , chromatography , organic chemistry , quantum mechanics
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.