The PolySense team has just published a new review article on Measurement Journal Elsevier (IF 5.2) on a formaldehyde gas detection using optical sensing. In this review, the laser-based spectroscopic techniques for formaldehyde 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.
The following link provides access to the article:
http://polysense.poliba.it/wp-content/uploads/2025/05/Review-formaldehyde_measurements_2025.pdf
