Method and arrangement for measuring timber

摘要

An arrangement and method for measuring a piece of timber in a wood handling machine, wherein the piece is grabbed by a cutting head arranged to a set of booms in the wood handling machine, and the dimensions of the piece are measured by at least one measuring device in the wood handling machine. A measuring signal field formed by one or more measuring beams is also directed to the piece of timber with a monitoring device utilizing contact-free measurement, and a point cloud to be stored is provided by the measuring signal field it produces. The parts to be identified are identified from this point cloud, and a quantity to be measured is defined and formed of the information content of the point cloud. The obtained result is directed to a measuring system in the wood handling machine for further utilization.

主权项

1. A method for measuring a piece of timber in a wood handling machine, the method comprising the steps of:
grabbing the piece of timber with a cutting head arranged on a set of booms of the wood handling machine; measuring the dimensions of the piece of timber with at least one measuring device in a cutting head of the wood handling machine; directing to the piece of timber a measuring signal field formed by one or more measuring beams with a monitoring device utilizing contact-free measurement; storing a point cloud produced by the measuring signal field; installing the monitoring device in the control cabin of the wood handling machine, for producing the point cloud; identifying the part of the piece to be identified, a reference level, and an end surface; from the point cloud; forming a three dimensional model of the part to be identified; defining a quantity to be measured; forming said quantity from the three dimensional model; directing the obtained result to a measuring system in the wood handling machine comparing the measured quantity with the measuring value produced by the cutting head in the wood handling machine as logging continues, for the purpose of obtaining a calibration value of the measuring result; estimating the need for correction caused by the defined calibration value of the identified piece of timber in view of the measuring data of the piece provided by the wood handling device; and correcting the measuring values obtained by the cutting head with the quantity obtained from the measuring signal field, for the purpose of calibrating a mechanical measuring device of timber.