Pulse-mode temperature sensing with langasite SAW devices

Wired and wireless surface acoustic wave (SAW) sensors with langasite Euler angle (0, 138.5, 27) and (0, 138.5, 117) were fabricated for the purpose of temperature and gas sensing in high temperature combustion process. Their temperature responses were measured in pulse mode both wired to a high-temperature cable and in wireless mode attached to a dipole antenna. The observed surface acoustic wave velocity monotonically decreases above 200 °C with multiple reflections observable in wired measurements up to 900 °C and in wireless mode up to 700 °C. Temperature resolution better than ± 0.5 C was achieved for wired and wireless measurements from 200 °C to 600 °C.

[1]  J. Bardong,et al.  Precise measurements of BAW and SAW properties of Langasite in the temperature range from 25°C to 1000°C , 2008, 2008 IEEE International Frequency Control Symposium.

[2]  Leonhard Reindl,et al.  Applicability of LiNbO3, langasite and GaPO4 in high temperature SAW sensors operating at radio frequencies. , 2004, IEEE transactions on ultrasonics, ferroelectrics, and frequency control.

[3]  Edward T. Zellers,et al.  Chapter 3 – Acoustic Wave Sensors and Responses , 1997 .

[4]  P. M. Davulis,et al.  CDMA and FSCW surface acoustic wave temperature sensors for wireless operation at high temperatures , 2009, 2009 IEEE International Ultrasonics Symposium.

[5]  L. Reindl,et al.  Applicability of LiNbO/sub 3/, langasite and GaPO/sub 4/ in high temperature SAW sensors operating at radio frequencies , 2004, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[6]  M.P. da Cunha,et al.  High temperature SAW gas sensor on langasite , 2003, Proceedings of IEEE Sensors 2003 (IEEE Cat. No.03CH37498).

[7]  Satoshi Uda,et al.  A Wireless Surface Acoustic Wave Temperature Sensor Using Langasite as Substrate Material for High-Temperature Applications , 2003 .

[8]  M.P. da Cunha,et al.  Platinum and palladium high-temperature transducers on langasite , 2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  Stephen J. Martin,et al.  Acoustic Wave Sensors: Theory, Design and Physico-Chemical Applications , 1996 .

[10]  Holger Fritze,et al.  Langasite for high-temperature acoustic wave gas sensors , 2003 .

[11]  Xiaojun Ji,et al.  Langasite Membranes for Surface Acoustic Wave Pressure Sensors , 2006 .

[12]  T. Moonlight,et al.  High temperature sensing technology for applications up to 1000°C , 2008, 2008 IEEE Sensors.

[13]  Glen McHale,et al.  Layer guided surface acoustic wave sensors using langasite substrates , 2009, 2009 IEEE International Frequency Control Symposium Joint with the 22nd European Frequency and Time forum.

[14]  Tao Han,et al.  Investigation on SAW properties of LGS and optimal cuts for high-temperature applications. , 2005, IEEE transactions on ultrasonics, ferroelectrics, and frequency control.

[15]  Richard M. White,et al.  Surface elastic waves , 1970 .