PC based instrument for detection of knots in wood

Date

5-2002

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Emmanuel A Florido

Abstract

A PC-based detection system using ultrasonic non-destructive testing method was implemented for the detection of knots in wood By means of a semi-direct shadow method setup, the frequency signatures of clean and knotted wood were ascertained and were used in the evaluation of the samples An ultrasonic piezoelectric transducer pair was used. It has a specified frequency input of 25.4 KHz, which was picked up by the receiving transducer The receiving end was connected to an amplifier, in which the received signals varied in intensity because of the varying density of the samples. The data stored were then analyzed in both the time domain and frequency domain. There were a total of 96 samples 48 of these were knotted and the other 48 were clean. Out of the 96 samples, 79 were detected correctly, showing an accuracy of 82.29%. This indicates that an ultrasonic scanning and detection setup could be implemented for an automated timber grading system.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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