Formaldehyde (H2CO) is a colorless gas with a strong irritating odor, widely used in furniture manufacturing and house decoration. Already at concentration in the few ppm range, H2CO represents great harm to human health, therefore, accurate measurement of formaldehyde concentration is of great significance for human safety. In this review, the laser-based spectroscopic techniques for formaldehyde gas detection were investigated, such as cavity ring-down spectroscopy (CRDS), cavity-enhanced absorption spectroscopy (CEAS), integrated cavity output spectroscopy (ICOS), tunable diode laser absorption spectroscopy (TDLAS), multi-pass cell absorption spectroscopy (MC), differential optical absorption spectroscopy (DOAS), non-dispersive absorption spectroscopy (NDAS), and photoacoustic spectroscopy (PAS). Among these techniques, the lowest detection limit achieved with an infrared laser source resulted in 28 ppt with a signal integration time of 40 s, and 210 ppt with an integration time of 30 s when using an ultraviolet light source.
A review of laser-spectroscopy-based gas sensing techniques for trace formaldehyde detection / Yang, Xiu; Chen, Baisong; Liang, Yize; Hou, Jiajia; Zhang, Dacheng; Li, Biao; Sampaolo, Angelo; Patimisco, Pietro; Spagnolo, Vincenzo; Yin, Xukun. - In: MEASUREMENT. - ISSN 0263-2241. - ELETTRONICO. - 253:(2025). [10.1016/j.measurement.2025.117656]
A review of laser-spectroscopy-based gas sensing techniques for trace formaldehyde detection
Sampaolo, Angelo;Patimisco, Pietro;Spagnolo, Vincenzo
;
2025
Abstract
Formaldehyde (H2CO) is a colorless gas with a strong irritating odor, widely used in furniture manufacturing and house decoration. Already at concentration in the few ppm range, H2CO represents great harm to human health, therefore, accurate measurement of formaldehyde concentration is of great significance for human safety. In this review, the laser-based spectroscopic techniques for formaldehyde gas detection were investigated, such as cavity ring-down spectroscopy (CRDS), cavity-enhanced absorption spectroscopy (CEAS), integrated cavity output spectroscopy (ICOS), tunable diode laser absorption spectroscopy (TDLAS), multi-pass cell absorption spectroscopy (MC), differential optical absorption spectroscopy (DOAS), non-dispersive absorption spectroscopy (NDAS), and photoacoustic spectroscopy (PAS). Among these techniques, the lowest detection limit achieved with an infrared laser source resulted in 28 ppt with a signal integration time of 40 s, and 210 ppt with an integration time of 30 s when using an ultraviolet light source.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
