Electromechanical film as a photoacoustic transducer.
An electromechanical film, EMFi, is utilized as a transducer in a photoacoustic (PA) gas sensor. The film is a sensitive acoustic transducer, it is easily formable, and it exhibits a wide frequency response regardless of its large surface area. As a demonstration of its capabilities, the EMFi-based PA detector is used to measure NO(2) with pulsed excitation at 436 and 473 nm. The minimum detectable absorption coefficient is extrapolated to be 5.10(-7) cm(-1). Improvements for EMFi-based PA detector are discussed.
Manninen
Albert
A
Optics Laboratory, Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland. albert.manninen@tut.fi
Sand
Johan
J
Saarela
Jaakko
J
Sorvajärvi
Tapio
T
Toivonen
Juha
J
Hernberg
Rolf
R