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http://dx.doi.org/10.5369/JSST.2009.18.1.033

Fabrication and characteristics of multilevel acoustic Fresnel lens for ultrasonic transducer for diagnostic imaging  

Kim, Dong-Hyun (Prosonic Co. Ltd.)
Ha, Kang-Lyeol (Department of Physics, Pukyong National University)
Kim, Moo-Joon (Department of Physics, Pukyong National University)
Kim, Jung-Soon (Department of Multimedia Engineering, Tongmyong University)
Publication Information
Journal of Sensor Science and Technology / v.18, no.1, 2009 , pp. 33-41 More about this Journal
Abstract
A multilevel acoustic Fresnel lens (MAFL) for the ultrasonic imaging transducer of which center frequency is approximately 5.MHz was newly designed and fabricated. The phase level of the lens was 64, and the focal length and the aperture width were 30.mm and 11.mm, respectively. The characteristics of impulse response, acoustic field and imaging performance of the transducer attached the lens were compared with the transducer attached a conventional refraction type acoustic lens (RAL). The results show that the center frequency, the loop sensitivity, and the focal depth of the MAFL transducer were higher or larger than those of the RAL transducer by approximately 0.2.MHz, 1.4.dB, and 2.mm, respectively. Consequently, it was shown that the brighter acoustic images with higher lateral resolution and the increased imaging performance for deep targets can be obtained by using the MAFL transducer.
Keywords
ultrasonic transducer; acoustic lens; Fresnel lens; multilevel acoustic Fresnel lens(MAFL); ultrasonic imaging;
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