Title :
The Small Volume Liquid Density Sensor Using Surface Acoustic Wave
Author :
Lu, Xiafu ; Luo, Yingqiong ; Wang, Ping ; Deng, Mingxi
Author_Institution :
Autom. Inst., Chongqing Univ. of Post & Telecommun.
Abstract :
Shear horizontal surface acoustic wave (SH-SAW) are generated and detected by interdigital transducers (IDT). When the viscoelastic liquid comes in contact with the delay path in a SH-SAW device, the viscous coupling action would effect on the wave propagation. Consequently the frequency, phase and propagating velocity of the SH-SAW are altered. In this paper the properties of the acoustic wave in a liquid overlay on a piezoelectric substrate are investigated. The theory analysis and initial experiment are presented. The result shows when signal frequency is 57.8 MHz, the SH-SAW can be excited effectively in the lithium niobate crystal. By measuring the phase change of the SH-SAW, the liquid density can be detected. Compared with traditional liquid density sensor, the SH-SAW liquid density sensor has the advantages of simple construction, high precision and little sample etc
Keywords :
acoustic wave propagation; density; density measurement; interdigital transducers; lithium compounds; niobium compounds; non-Newtonian fluids; surface acoustic wave sensors; surface acoustic waves; 57.8 MHz; interdigital transducers; liquid density sensor; lithium niobate crystal; piezoelectric substrate; shear horizontal surface acoustic wave; viscoelastic liquid; wave propagation; Acoustic propagation; Acoustic sensors; Acoustic signal detection; Acoustic transducers; Acoustic waves; Elasticity; Frequency; Surface acoustic wave devices; Surface acoustic waves; Viscosity; Liquid density; Sensor; Surface acoustic wave;
Conference_Titel :
Mechatronics and Automation, Proceedings of the 2006 IEEE International Conference on
Conference_Location :
Luoyang, Henan
Print_ISBN :
1-4244-0465-7
Electronic_ISBN :
1-4244-0466-5
DOI :
10.1109/ICMA.2006.257618
