12 주파수의 48 tonpilz 진동소자를 이용한 광대역 초음파 모자이크 변환기의 대역폭 확장
Bandwidth Enhancement of a Broadband Ultrasonic Mosaic Transducer using 48 Tonpilz Transducer Elements with 12 Resonance Frequencies
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초록
This article describes the design and performance characteristics of a broadband ultrasonic mosaic transducer. We focus on the improved bandwidth in the high frequency band of a previously designed broadband ultrasonic trans- ducer (Lee et al., 2014). The improvement in the pulse-echo bandwidth was achieved by employing twelve 2×2 ele- ment subarrays, operating at different resonance frequencies, and utilizing the mosaic array concept. We found that the -6 dB and -12 dB bandwidths of the newly developed broadband ultrasonic mosaic transducer, were up to 155% and 170% of the previously designed model, with a quality factor of 1.71 and 1.25, respectively. The averaged TVR (transmitting voltage response), SRT (receiving sensitivity), and FOM (figure of merit) values in a nearly flat trans- mitting response band, from 45 to 105 kHz providing a -12 dB bandwith of 60 kHz, were 163.3 dB (re 1 μPa/V at 1 m), -192.8 dB (re 1 V/μPa), and -30.9 dB, respectively.
Abstract
This article describes the design and performance characteristics of a broadband ultrasonic mosaic transducer. We focus on the improved bandwidth in the high frequency band of a previously designed broadband ultrasonic trans- ducer (Lee et al., 2014). The improvement in the pulse-echo bandwidth was achieved by employing twelve 2×2 ele- ment subarrays, operating at different resonance frequencies, and utilizing the mosaic array concept. We found that the -6 dB and -12 dB bandwidths of the newly developed broadband ultrasonic mosaic transducer, were up to 155% and 170% of the previously designed model, with a quality factor of 1.71 and 1.25, respectively. The averaged TVR (transmitting voltage response), SRT (receiving sensitivity), and FOM (figure of merit) values in a nearly flat trans- mitting response band, from 45 to 105 kHz providing a -12 dB bandwith of 60 kHz, were 163.3 dB (re 1 μPa/V at 1 m), -192.8 dB (re 1 V/μPa), and -30.9 dB, respectively.
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