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SAW delay lines for thermal detection of gases and gas flows

TitleSAW delay lines for thermal detection of gases and gas flows
Publication TypePresentazione a Congresso
Year of Publication1995
AuthorsAnisimkin, V.I., Penza Michele, Maksimov S.A., and Vasanelli L.
Conference NameProceedings of the IEEE Ultrasonics Symposium
PublisherIEEE, Piscataway, NJ, United States
Conference LocationSeattle, WA, USA
KeywordsAcoustic delay lines, Acoustic surface wave devices, Bismuth compounds, Chemical analysis, Chemical sensors, Forced convection coefficient, Frequencies, Gases, Heat convection, Heat losses, High temperature sensitivity, laminar flow, Linear approximation, Lithium compounds, Silica, Temperature coefficient of velocity, Thermal conductivity, Thermal probes

Uncoated SAW delay lines performing as thermal probes are applied for detection of gases and gas flows. Analysis of the forced convection is performed for 13 analytes in linear approximation by neglecting their chemical interaction with ambient. Experimental detection is performed for H2, He, Ar, CH4, NH3, N2, O2, dry air, using SAW delay lines on SiO2, LiNbO3, Bi12 GeO20, Bi12SiO20 at operating temperatures T = 25 - 165 °C and frequencies f = 21 - 263 MHz. SAW responses are measured as a function of concentration n, flow rate u, temperature coefficient of velocity (TCV) and temperature T. Efficient selectivity and monitoring of the responses are demonstrated by a proper selection of TCV and T. Detection of 0.35% CH4, 0.25% H2 and 0.1% NH3 in N2 is performed. Linear output for u = 50 - 2000 ml/min is obtained.

Citation KeyAnisimkin1995481