Piezoelectric tube as resonant transducer for gas-phase photoacoustics

• Published in: Analytica chimica acta Vol. 1147; pp. 165 - 169
• Main Authors: Keeratirawee, Kanchalar, Hauser, Peter C.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 22.02.2021
• Subjects: Blue laser diode; Nitrogen dioxide (NO2); Photoacoustic spectroscopy; Piezoelectric tube; Piezoelectric tube; Photoacoustic spectroscopy; Nitrogen dioxide (NO2); Blue laser diode; Nitrogen dioxide (NO)
• ISSN: 0003-2670; 1873-4324; 1873-4324
• DOI: 10.1016/j.aca.2020.12.063

The use of a piezoelectric tube for the photoacoustic gas-phase determination of NO2 as a model analyte is demonstrated. The tube is made from lead zirconate titanate with 30 mm length and 5.35 mm internal diameter. Its inner and outer surfaces are coated with electrodes. The tube serves as both, resonance body and transducer. The design is thus simpler than the usual combination of resonance tube and microphone as the two functions are embodied in the same component. The main resonance frequency of the tube was found to be 5341 Hz. A blue laser diode emitting at 450 nm was employed as light source for the determination of NO2. The limit of detection was determined as 83 ppbV and the calibration curve was linear with a coefficient of determination (r2) of 0.9998 up to the highest concentration of 15 ppmV tested. [Display omitted] •First time use of piezoelectric tube for gas detection in photoacoustic spectroscopy is reported.•The piezoelectric tube served the dual purpose of resonator tube and acoustic signal detector.•A detection limit of 83 ppbV was obtained for NO2 as model analyte using a blue laser diode.