Title :
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
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;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293226
