| dc.description.abstract | The objectives of this research is to study the ultrasonic wave characteristic at arumanis mangoes damage caused by fruit fly, to study relation between the ultrasonic wave characteristic with arumanis mangoes damage caused by fruit fty. The ultrasonic characteristics that was used to sort the damaged mangoes from the normal mangoes were attenuation, velocity and moment zero power (Mo) number. Resu/fs showed that attenuation coefficient mean normal arumanis mangoes was 36.45 Np/m, velocity mean of ultrasonic wave was 518.19 m/s and Mo number was 4.58. The attenuation coefficient mean arumanis mangoes which damaged by fruit fly was 30.67 Np/m, velocity mean of ultrasonic wave ,was 731.72 m/s and Mo number was 6.40. Relation between the ultrasonic wave characteristic with arumanis mangoes damage caused by fruit fly showed that attenuation coefficient of arumanis mangoes increase but damage arumanis mangoes level decrease. While Mo number increase in parallel with increase of damage arumanis mangoes level. The ultrasonic wave velocities of arumanis mangoes haven't clear correlation with damage arumanis mangoes level, this matter show from value y'=0.01. Larua weight of inversely to value of attenuation coefficient, correlation of logarithm value f =0.g4. Correlation value of larva weight with Mo number is f =0.38. | en |
