期刊
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
卷 65, 期 2, 页码 223-230出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2017.2778738
关键词
Clamped permittivity; high-frequency ultrasound; modified Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT) ceramic; needle transducer
资金
- National Science Foundation of China [81527901, 61571431, 11325420, 11534013]
- National Basic Research Program of China [2015CB755500]
- CAS Research Projects [Y650311C31, QYZDB-SSW-JSC018, YJKYYQ20170065]
- Guangdong Innovative and Entrepreneurial Research Team Program [2013S046]
- Natural Science Foundation of Guangdong Province [2015A030306018, 2014A030313686, 2014A030312006, 2014B030301013]
- Shenzhen Peacock Plan [20130409162728468]
- Shenzhen Foundation [JCYJ20170413164936017]
A modified Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT) polycrystalline ceramic with ultrahigh relative clamped dielectric permittivity (epsilon(S)/epsilon(0) = 3500) and high piezoelectric properties (d(33) = 1200 pC/N, k(t) = 0.55) was used to fabricate high-frequency miniature ultrasound transducers. A 39-MHz high-frequency ultrasound needle transducer with a miniature aperture of 0.4 mm x 0.4 mm was designed and successfully characterized. The fabricated needle transducer had an electromechanical coupling factor k(t) of 0.55, large bandwidth of 80% at -6 dB, and low insertion loss of -13 dB. A wire phantom and porcine eyeball imaging study showed good imaging capability of this needle transducer. The transducer performance was found to be superior to that of other needle transducers with miniature apertures, making this modified PMN-PT ceramic-based needle transducer quite promising for minimally invasive procedures in medical applications.
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