The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on an all-fiber-based laser gas analyzer (LGA) employing quartz-enhanced photoacoustics spectroscopy (QEPAS) and a side-polished fiber (SPF). Sensor performance was demonstrated using methane in nitrogen gas mixtures, with CH4 mixing ratios ranging from 75 ppmv to 1% (by volume), measured Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on a photoacoustic sensor for the detection of CO impurities in hydrogen. A DFB-QCL laser with a central wavelength of 4.61 µm was employed as an exciting source with an optical power of 21 mW. The minimum detection limit Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Optics Express Journal reporting on an end-to-end methane gas detection algorithm based on transformer and multi-layer perceptron (MLP) for tunable diode laser absorption spectroscopy (TDLAS). It consists of a Transformer-based U-shaped Neural Network (TUNN) filtering algorithm and a concentration prediction network (CPN) based on MLP. Leggi di piùNew Publication on Optics Express[…]
The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on folded-optics-based quartz-enhanced photoacoustic and photothermal hybrid spectroscopy (FO-QEPA-PTS). In FO-QEPA-PTS, the detection of the photoacoustic and photothermal hybrid signal is achieved through the use of a custom quartz tuning fork (QTF). A multi-laser beam, created by a multi-pass Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on the novel employment of lithium niobate tuning forks as acoustic transducers in photoacoustics spectroscopy for gas sensing. The lithium niobate tuning fork (LiNTF) exhibits a fundamental resonance frequency of 39196.6 Hz and a quality factor Q = 5900 Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Sensors Journal (IF 3.84) reporting on the implementation of an innovative multi-quantum cascade laser (QCL) module for quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing. The source is composed of three different QCLs coupled with a dichroitic beam combiner module that provides an overlapping collimated beam output for Leggi di piùNew Publications on Sensors Journal[…]
Polysense is proud to communicate that team members have been listed for the fourth year in a row in the Top 2% Scientists list in the world by Stanford University. In particular, Vincenzo Spagnolo has been included in the full career Top 2% Scientists list, scaling more than 18K positions since last year. while Vincenzo Leggi di piùPolysense Team members listed in the 2022 Top 2% Scientists in the world by Stanford University[…]
The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on a comparative analysis of two different approaches developed to deal with molecular relaxation in photoacoustic spectroscopy. The first method employs a statistical analysis based on partial least squares regression, while the second method relies on the development of Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Optics & Laser Technology journal reporting on a study of the generation of Laser-Induced Periodic Surface Structures (LIPSS) on quartz upon irradiation with linearly polarized femto-second laser pulses (pulse duration τ = 200 fs and central wavelength λ = 1030 nm). Two different regimes of Leggi di piùNew Publication on Optics and Laser Technology journal[…]
The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on a quartz enhanced photoacoustic spectroscopy (QEPAS) gas sensor designed for monitoring of ammonia (NH3) at ppb-level concentrations. The sensor is based on a novel custom quartz tuning fork (QTF) with a mid-infrared quantum cascade laser emitting at 9.55 Leggi di piùNew Publication on Photoacoustics Journal[…]