The PolySense team has just published  a new article on Optics & Laser Technology journal (IF 5.0) reporting on a Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS)-based sensor for sequentially measuring carbon monoxide (CO), nitrous oxide (N2O), and water vapor emissions near vehicle exhaust pipes. With detection limits of 150 ppb for N2O and 91 ppb for CO, this sensor Leggi di piùNew Publication on Optics & Laser Technology Journal[…]

The PolySense team has just published  a new article on Photoacoustics Journal Elsevier (IF 6.8)  reporting on a novel approach for gas concentration measurement using a differential resonant photoacoustic cellcombined with a deep learning-based signal denoising model. This method addresses the persistent challenge of noise interference in 2 f signals at low gas concentrations, where Leggi di piùNew Publication on Photoacoustics Journal[…]

The PolySense team has just published  a new article on Molecules Journal MPDI (IF 4.6)  reporting a study aimed at defining the infrared spectral signatures of volatile organic compounds (VOCs) of relevant interest for coffee bean authentication and quality control. Fourier Transform Infrared Spectroscopy was employed to acquire the mid-infrared absorption spectra of some representative Leggi di piùNew Publication on Molecules Journal[…]

The PolySense team has just published  a new article on Sensors Journal MPDI (IF 3.5)  reporting on an ultra-compact optical gas-sensing system, consisting of a pigtailed laser diode emitting at 1392.5 nm for water vapor (H2O) detection, a silicon nitride (Si3N4) optical waveguide to guide the laser light, and a custom-designed, low-frequency, and T-shaped Quartz Leggi di piùNew Publication on Sensors Journal[…]

The PolySense team has just published  a new article on Light: Advanced Manufacturing Journal reporting on the development of a laser surface functionalization process to enhance the optical absorption of quartz crystals, named hereafter Black Quartz, in the 1-5 µm spectral range. Black Quartz consists of surface modification of quartz crystal by ultra-fast-pulsed-laser-processing to create Leggi di piùNew Publication on Light: Advanced Manufacturing[…]

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 Leggi di piùNew Publication on Measurement Journal[…]

The PolySense team has just published  a new article on Sensors Journal MPDI (IF 3.4)  reporting on a multi-gas sensor for greenhouse detection based on QEPAS. The sensor exploits an innovative, compact three-wavelength laser module as excitation source. The module integrates three interband cascade laser chips with a beam combining system, all enclosed in a Leggi di piùNew Publication on Sensors Journal[…]

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 Leggi di piùNew Publication on Photoacoustics Journal[…]

The PolySense team has just published  a new article on Sensors and Actuators B Chemical Journal Elsevier (IF 8.0)  reporting on a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for ammonia impurities detection in hydrogen. A quantum cascade laser with a central emission wavelength of 9.062 μm was used to excite the NH3 absorption line at 1103.44 cm−1, with Leggi di piùNew Publication on Sensors and Actuators B Chemical Journal[…]