8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-515-C7-518
Purely thermal wave based non-chemical photopyroelectric gas sensor : application to hydrogenM. Munidasa, A. Mandelis and A. Katz
Photothermal and Optoelectronic Diagnostic Laboratory, Department of Mechanical Engineering and Center for Hydrogen and Electrochemical Studies (CHES), University of Toronto, Toronto, Canada, M5S 1A4
A commercially available polyvinylidene fluoride (PVDF) pyroelectric film with an optically generated thermal wave field has been introduced as the active device for a new non-chemical hydrogen gas sensor. The sensitivity to hydrogen at low flow rates (< 500 ml/min) is obtained through thermal boundary condition changes introduced by the gas at the film-gas interface. Photopyroelectric voltage amplitude and phase changes due to hydrogen-air mixtures with respect to pure air, obtained through a lock-in amplifier are discussed.
© EDP Sciences 1994