Majors of Agricultural Engineering, Faculty of Agriculture, University of Lampung
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The objective of this research is to apply the ultrasonic attenuation coefficient for detection the arumanis mangoes damage caused by fruit fly. Coefficient of Attenuation counted with converting tension of signal sent and accepted after pass through over certain become wave graph. Results showed that attenuation coefficient mean arumanis mangoes which damaged by fruit fly was 30.67 Np/m, the attenuation coefficient mean normal arumanis mangoes was 36.45 Np/m and border number for sorting application were 34.76 Np/m for attenuation coefficient with prediction: attenuation more than 34.76 for normal mango and attenuation less than or same 34.76 for mango invested by fruit fly based on coefficient attenuation. All normal mangoes damage mangoes caused by fruit fly could be sorted successfully with formula border number based on attenuation coefficient.
Keywords: ultrasonic, attenuation, detection, arumanis mangoes, fruit fly.