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Transversely Excited Multipass Photoacoustic Cell Using Electromechanical Film as Microphone

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Author(s): Jaakko Saarela | Johan Sand | Tapio Sorvajärvi | Albert Manninen | Juha Toivonen

Journal: Sensors
ISSN 1424-8220

Volume: 10;
Issue: 6;
Start page: 5294;
Date: 2010;
Original page

Keywords: multipass | photoacoustic | spectroscopy | longitudinal resonance | transversal excitation | transducer | electromechanical film microphone | EMFIT film

ABSTRACT
A novel multipass photoacoustic cell with five stacked electromechanical films as a microphone has been constructed, tested and characterized. The photoacoustic cell is an open rectangular structure with two steel plates facing each other. The longitudinal acoustic resonances are excited transversely in an optical multipass configuration. A detection limit of 22 ppb (10−9) was achieved for flowing NO2 in N2 at normal pressure by using the maximum of 70 laser beams between the resonator plates. The corresponding minimum detectable absorption and the normalized noise-equivalent absorption coefficients were 2:2 × 10−7 cm−1 and 3:2 × 10−9 cm−1WHz−1/2, respectively.

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