Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9952764 | Sensors and Actuators A: Physical | 2018 | 25 Pages |
Abstract
It has been well known that fabrication of the ultrasound array transducer is very difficult mainly due to the thin piezoelectric layer. Since the center frequency of the ultrasound array transducer is inversely proportional to the thickness of the piezoelectric layer, as the center frequency is increased, fabrication of the array transducer becomes more difficult. To solve this problem, in this paper, the polarization inversion technique (PIT) was employed to increase the center frequency of the array transducer without making the piezoelectric layer thin. Additionally, the PIT can increase the frequency bandwidth of the transducer by using its multiple-resonance feature. According to the finite element analysis (FEA) simulation, when the total thickness of the piezoelectric layer was fixed at 311âμm, the conventional transducer had a center frequency of 4.5âMHz and â6âdB bandwidth of 71.4%, while the proposed transducer with PIT had a center frequency of 8.1âMHz and â6âdB bandwidth of 83.2%. In the case of conventional transducer with about 8âMHz center frequency, the thickness of the piezoelectric layer was 155âμm, and â6âdB bandwidth was 72.3%. Subsequently, we fabricated a prototype transducer with PIT and verified that the center frequency and â6âdB bandwidth were 7.8âMHz and 81.3%, respectively. Therefore, the PIT can be a useful method for manufacturing the ultrasound array transducer with high frequency and broad bandwidth.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Chan Yuk Park, Jin Ho Sung, Jong Seob Jeong,