LASCAN – A LASER-BASED LOG-MEASUREMENT SYSTEM
Abstract
KEBA - Sawmill-Automation and the Microelectronics Institute of the Johannes Kepler University of Linz developed a new low-cost-system for measuring the diameter of a log with mm resolution. The system utilizes two laser beams forming an angle of 90°. Each of them is scanned by a rotating polygon mirror towards a retroreflector located in a distance of about 2 meters. Each retro-reflected laser beam is detected by a large-area photo diode mounted near the polygon mirror. An object (log) hit by the scanning laser beams produces for a certain time a shadow on the two reflectors and, hence, on the photo diodes which in turn generate high/low/high-signals. A signal processor converts these signals into the required geometrical data. The system called LASCAN is capable of measuring diameter and position of a log at high speed. The obtained data enable the sawmill to deliver to the customer the requested log with an opimized cut at a low prize.
Event details
- Event
- XVI IMEKO World Congress
- Place
- Vienna, AUSTRIA
- Time
- 25 September 2000 - 28 September 2000