The PolySense and Polysense Innovations teams have just published a new article on Sensors and Actuators B Chemical Journal (IF 7.7) reporting on a custom- grooved QTF with large prong spacing and low resonance frequency designed to effectively suppress background noise, improve the matching between molecular relaxation and acoustic resonance and enhance piezoelectric signal collection efficiency. An erbium-doped fiber amplifier (EDFA) was employed to construct a high-power excitation QEPAS system. The proposed system achieved an enhancement of nearly 3 orders of magnitude in detection performance compared with a standard QTF, with a minimum detection limit (MDL) of 0.9 ppm for CO2. The sesnor system was evaluated in three representative scenarios, namely ambient air monitoring, human breath analysis, and dissolved gas analysis in transformer oil. The results demonstrate reliable tracking of atmospheric and respiratory CO2 variations, as well as sensitive detection of dissolved CO2 in transformer oil.
The following link provides access to the article:
http://polysense.poliba.it/wp-content/uploads/2026/09/1-s2.0-S0925400526011536-main.pdf
