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논문 상세정보


This study was conducted to develop an non-contact ultrasonic transducer for measurement of fruit firmness. The center frequency of non-contact ultrasonic transducer was 500 kHz. As an active element of non-contact ultrasonic transducer, the 1-3 piezoelectric composite material was selected. That material has high piezoelectric properties such as electro-mechanical coupling factor, $k_t$ and piezoelectric voltage constant, $d_{33}$ and also that material has low acoustical impedance which enables to matching the acoustical impedances between piezoelectric material and air. As a front matching material between 1-3 piezoelectric composite material and air, various kinds of paper with different thickness were tested. To control the dead-zone of the fabricated non-contact ultrasonic transducer, the backing material composed of epoxy resin and tungsten powder were made and evaluated. The fabricated non-contact ultrasonic transducer for fruit showed that the cneter frequency, bandwidth and beamwidth were approximately 480 kHz, 30 % and 12 mm, respectively. It was concluded that non-contact measurement of apple firmness would be possible by using the fabricated non-contact ultrasonic transducer.

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참고문헌 (12)

  1. De Belie, N., K. Tu, P. Jancsok and J. De Baerdemaeker. 1999. Preliminary study on the influence of turgor pressure on body reflectance of red laser light as a ripeness indicator for apple. Postharvest Biology and Technology 16:279-284. 
  2. Hertog, M. L., R. Ben-Arie, E. Roth and B. M. Nicolai. 2004. Humidity and temperature effects on invasive and non-invasive firmness measures. Postharvest Biology and Technology 33: 79-91. 
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  8. Kino, G. S. 1987. Acoustic Waves-Devices, Imaging & Analog Signal Processing. Prentice-Hall, Englewood Cliffs, New Jersey, USA. 
  9. Kinsler, L. E., A. R. Frey, A. B. Coppens and J. V. Sanders. 2000. Fundamentals of Acoustics. New York, Wiley, USA. 
  10. Liljedahl, L. A. and J. A. Abbott. 1994. Changes in sonic resonance of ‘Delicious’ and ‘Golden Delicious’ apples undergoing accelerated ripening. Transactions of the American Society of Agricultural Engineers 37(3):907-912. 
  11. Mizrach, A., U. Flitsanov and Y. Fuchs. 1997. An ultrasonic nondestructive method for measuring maturity of mango fruit. Transactions of the American Society of Agricultural Engineers 40(4):1107-1111. 
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이 논문을 인용한 문헌 (1)

  1. 2013. "" Journal of biosystems engineering : JBE, 38(3): 192~198 


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