The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.1) reporting on a novel optical synchronized signal demodulation (OSSD) method applied in quartz-enhanced photoacoustic spectroscopy (QEPAS) for remote gas sensing. Using 1 % of the laser source as an optical syn chronization signal, kilometer-scale remote gas detection was achieved, overcoming the challenges of long- distance real-time detection in complex environments with conventional QEPAS. A time-sharing OSSD-QEPAS system for sewer methane detection was subsequently developed and achieving a detection limit of 445 ppb with a 300-ms averaging time. TContinuous methane measurements covering a 14-hour period at two different sewer locations on campus were performed.
The following link provides access to the article:
http://polysense.poliba.it/wp-content/uploads/2025/03/Remote-QEPAS-Sewer_Photoacoustics_2025.pdf
