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Real-time ultrasonic measurements of log diameters
2008 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In today's harvesters they measure log diameters with the limbing knifes. This system does not meet the requirements of today's forestry. So Skogforsk (the Forestry Research Institute of Sweden) and a group of companies contacted LTU (LuleƄ University of Technology) to develop a system with ultrasonic sensors to measure the diameter. This project is a continuation of the Master's thesis on Log Diameter Measurements Using Ultrasound by Reza Tavakolizadeh (2007). The overall goal with this project was to do the whole chain from the sensor modules to calculations of diameters and filtering. This was done by choosing between commercial sensor modules and programming in MATLAB and C/C++. Skogforsk and the group of companies chose a commercial approach of this project in the means of the sensor modules. The sensor modules that were found were not built for this purpose so they do not meet the requirements. But they were used to show that the whole chain from the sensor modules to calculated diameters and filtering, works without any synchronization of the sensors modules when all sensor modules operate simultaneously.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Log diameters, Ultrasound measurements
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42506ISRN: LTU-EX--08/146--SELocal ID: 082a267e-5cfe-4113-bef4-c890655247d2OAI: diva2:1015728
Subject / course
Student thesis, at least 30 credits
Educational program
Electrical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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