摘要:

Results are presented for the propagation of circumferential acoustic waves around a thin-walled stainless steel tube. Sol gel lead titanate-zirconate (PZT) films and chirp interdigital transducer (IDT) electrodes were used to generate theA0mode from 0.8 to 6.0 MHz. Group and phase velocity measurements are in good agreement with the theory for the empty tube. When the tube is filled with water a large decrease of 21% in group velocity is observed. While there is as yet no theoretical explanation for this effect, the results show promise for liquid sensing applications.

ISSN:0001-4966    

DOI:10.1121/1.423951

出版商:Acoustical Society of America    

年代:1998

数据来源: AIP

摘要:

In this Letter an alternative method for the experimental determination of the complex acoustic propagation transfer function is presented. The method uses an adaptive filter in system identification mode. The inputs to the system are the source and received signals. The transfer function is represented by finite impulse response filter coefficients. Good results were obtained using filter lengths in the range from 100 to 250 with a sampling rate of 12 k samples/s. The method is outlined and some representative results with experimental field data are given.

ISSN:0001-4966    

DOI:10.1121/1.423952

出版商:Acoustical Society of America    

年代:1998

数据来源: AIP