Acoustic wave gas sensors

An overview of acoustic wave sensors for gas sensing is presented from both a fundamental and a practical point of view. The main interaction mechanis ms between the acoustic wave and gaseous species are briefly reviewed, foll owed by a descriptive survey of the different types of sensors. Detailed re sults for the sensitivity of different acoustic modes are presented with nu merical examples for realistic cases. A critical discussion is given of sev eral approaches to chemical selectivity and the many practical issues of im portance for environmental sensing. Anticipated future trends are presented in the conclusion. (C) 1999 Elsevier Science S.A. All rights reserved.