Performance of a azimuthally excited 3D-printed resonator for multi-pass spectroscopic applications

Gordon S. Humphries, Ralf Bauer, Michael Lengden

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A design is presented for an acoustically resonant cell, based on the excitation of azimuthal resonances, to enhance the sensitivity of multi-pass photoacoustic spectroscopy. The acoustic cell is fabricated in one part using a photo-polymerization based 3D-Printing technique. Characterization of the cell performance is undertaken using calibrated concentrations of methane. The quality factor (< 76) of the cell compares favorably to existing designs based on longitudinal resonances. The minimum detectable normalized noise equivalent absorption coefficient for the cell was measured as: 3.667×10^ -10 Wcm^-1 Hz^-1/2, resulting in a minimum sensitivity for methane of 6 ppm with 700 s of averaging.
Original languageEnglish
Number of pages3
Publication statusPublished - 30 Oct 2017
EventIEEE SENSORS 2017 - Scottish Exhibition and Conference Centre, Glasgow, United Kingdom
Duration: 29 Oct 20171 Nov 2017


ConferenceIEEE SENSORS 2017
Country/TerritoryUnited Kingdom
Internet address


  • photoacoustic sensors
  • 3D printed photoacoustic trace gas sensor
  • 3D Printing
  • photoacoustic spectroscopy (PAS)
  • laser absorption
  • TDLS


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  • 2016 EPSRC Doctoral Prize

    Humphries, G. S. (Recipient), May 2016

    Prize: Fellowship awarded competitively

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