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Sensors 2010, 10(6), 5294-5307; doi:10.3390/s100605294
Article

Transversely Excited Multipass Photoacoustic Cell Using Electromechanical Film as Microphone

1,* , 1
,
1
,
1,2
 and
1
1 Optics Laboratory, Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland 2 Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Air Pollution & Environmental Technology, Überlandstr. 129, 8600 Dübendorf, Switzerland
* Author to whom correspondence should be addressed.
Received: 19 April 2010 / Revised: 21 May 2010 / Accepted: 24 May 2010 / Published: 26 May 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
Download PDF [262 KB, 21 June 2014; original version 21 June 2014]

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.
Keywords: multipass; photoacoustic; spectroscopy; longitudinal resonance; transversal excitation; transducer; electromechanical film microphone; EMFIT film multipass; photoacoustic; spectroscopy; longitudinal resonance; transversal excitation; transducer; electromechanical film microphone; EMFIT film
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Saarela, J.; Sand, J.; Sorvajärvi, T.; Manninen, A.; Toivonen, J. Transversely Excited Multipass Photoacoustic Cell Using Electromechanical Film as Microphone. Sensors 2010, 10, 5294-5307.

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