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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.
|Number of pages||3|
|Publication status||Published - 30 Oct 2017|
|Event||IEEE SENSORS 2017 - Scottish Exhibition and Conference Centre, Glasgow, United Kingdom|
Duration: 29 Oct 2017 → 1 Nov 2017
|Conference||IEEE SENSORS 2017|
|Period||29/10/17 → 1/11/17|
- photoacoustic sensors
- 3D printed photoacoustic trace gas sensor
- 3D Printing
- photoacoustic spectroscopy (PAS)
- laser absorption
Lengden, M., Humphries, G., Johnstone, W., Lut Ho, H. & Jin, W., 28 Sep 2018, Proceedings 26th International Conference on Optical Fiber Sensors. Washington, DC: Optical Society of America, 4 p.
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution bookOpen AccessFile14 Downloads (Pure)