The PolySense and Polysense Innovations teams have just published a new article on the International Journal of Hydrogen Energy (IF 8.3) regarding the use of Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) for the detection of CO impurities in hydrogen . Due to the high speed of sound in hydrogen, the geometry of the spectrophone was specifically selected to ensure efficient sound wave amplification. Therefore, a QEPAS spectrophone was designed by exploiting a custom quartz tuning fork operating at first overtone mode (~44,0 kHz) in combination with compact resonator tubes. The spectrophone was integrated into a QEPAS sensor for CO trace detection at 2193.36 cm 1 in a hydrogen matrix. The QEPAS sensor was calibrated using certified mixtures, returning a detection limit of 1.5 ppm for 10 s.
The following link provides access to the article:
http://polysense.poliba.it/wp-content/uploads/2026/04/1-s2.0-S036031992601774X-main.pdf
