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
Recommended Citation
Tangonan, Andrew S., "PC based instrument for detection of knots in wood" (2002). Undergraduate Theses. 10590.
https://www.ukdr.uplb.edu.ph/etd-undergrad/10590
Document Type
Thesis