A method for improved transducer performance from 20 MHz to 100 MHz considering the effects of output impedance of a high frequency pulser

Author

Gottlieb, Emanuel J. ; Chen, Wo-Hsing ; Cao, Peijie ; Cannata, Jon ; Shung, K. Kirk

Author_Institution

Dept. of Biomed. Eng., Univ. of Southern California, Los Angeles, CA, USA

Volume

2

fYear

2003

fDate

5-8 Oct. 2003

Firstpage

1646

Abstract

A major assumption frequently made by transducer engineer is that the output impedance of the pulse drive waveform is below 50 Ω across the entire frequency spectrum. However, this is not the case and the output impedance has a reactive component that may considerable affect transducer center frequency and bandwidth. The pulse echo response of a 80 MHz LiNO₃ transducer was measured with and without an auto-transformer attached to the pulser. Improved transducer performance was shown.

Keywords

impedance matching; ultrasonic transducers; 20 to 100 MHz; 80 MHz; LiNO₃; auto transformer; high frequency pulser; output impedance effect; pulse drive waveform; pulse echo response; reactive component; transducer bandwidth; transducer center frequency; transducer performance improvement; Bandwidth; Biomedical measurements; Frequency measurement; Impedance; Pulse circuits; Pulse measurements; Pulse shaping methods; Shape measurement; Transducers; Transmission line measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics, 2003 IEEE Symposium on

Print_ISBN

0-7803-7922-5

Type

conf

DOI

10.1109/ULTSYM.2003.1293226

Filename

1293226