A SAW-based liquid sensor with identification for wireless applications

Author

Hassani, Farid ; Ahmadi, Shahrokh ; Korman, Can ; Zaghloul, Mona

Author_Institution

Dept. of Electr. & Comput. Eng., George Washington Univ., Washington, DC, USA

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

2023

Lastpage

2026

Abstract

The development of a shear horizontal surface acoustic wave (SH-SAW) liquid sensor with identification (ID) for wireless applications is described. Moreover, a novel feature of "write capability" for this sensor is proposed. The SH-SAW passive sensor has a delay line configuration with a sensing area. The sensor is fabricated on a lithium tantalate (LiTaO3) substrate, which is Y-cut with rotations specified between about 36° around the X-axis. The principle of detection is based on the attenuation and time delay between the signals. The sensor is encoded according to partial reflections of an interrogation signal by metal reflectors placed on both side of the interdigital transducers (IDT). The structure of the sensor, the principle of the wireless communication, the detection process and testing results are presented.

Keywords

acoustic delay lines; delays; identification; interdigital transducers; network analysers; surface acoustic waves; LiTaO₃; SAW based liquid sensor; SH-SAW passive sensor; delay line configuration; interdigital transducer; network analyzer; partial reflection; shear horizontal surface acoustic wave liquid sensor; signal attenuation; wireless communication; Acoustic sensors; Acoustic waves; Attenuation; Delay effects; Delay lines; Lithium compounds; Reflection; Sensor phenomena and characterization; Surface acoustic waves; Wireless sensor networks; IDT; LiTa03; SH-SAW; liquid sensor; passive sensor; wireless sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Conference_Location

Paris

Print_ISBN

978-1-4244-5308-5

Electronic_ISBN

978-1-4244-5309-2

Type

conf

DOI

10.1109/ISCAS.2010.5537163

Filename

5537163