PC-based instrument for ultrasonic detection of mango pulp weevil (Sternochetus frigidus Fabr.) infestation

Date

3-2001

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

A PC-based detection system was developed and used for investigating the presence of mango pulp weevil infestation. An Ultrasonic Delta testing technique was applied for nondestructive quality evaluation of the mango fruit and quantitative relations were established between ultrasonic parameters and infestation related factors. Ultrasonic waves at 24.6 kHz were transmitted through whole mango fruits using an ultrasonic transducer to investigate the existence of infestation. The waveform of reflected ultrasonic signals from infested mangoes differed from that of a mango free of infestation. Hence, defective mangoes could be separated based on waveform analysis of the reflected ultrasonic signals. A total of 312 mango fruits were tested to determine the accuracy of the instrument. Results revealed that ultrasonic delta testing technique could be used for nondestructive detection of mango pulp weevil with an accuracy of 80.13%. The delta testing method allows not only detection of the weevil but also of all forms of discontinuities created by other factors. This technique is also capable of establishing the location of the cavity at 75% accuracy. Thus, it could also be used for nondestructive quality evaluation of fruits.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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