Abstract

An arrangement for classifying logs (1) comprises transport means (21) for bringing a log (2) into a log support structure (24) of an analysis position (40). Transducers (50) for acoustic measurements are positionable into measuring positions at ends of the log (2). Electronic circuitry (60) of an acoustic measurement equipment and means for classifying (70) the log is connected to the transducers (50). The arrangement further comprises a dimension determining arrangement (16), arranged for determining outer dimensions of the log before the log is brought into the analysis position. The arrangement also comprises a position control (55) for controlling a coarse position in the axial direction of transducer support structures connected based on the determined outer dimensions. The position control is further arranged for performing the controlling at least partly before or at least partly concurrently to the log being brought into the analysis position. A corresponding method is also disclosed.

IPC Classes  ?

• B07C 5/14 - Sorting timber or logs
• G01B 17/06 - Measuring arrangements characterised by the use of infrasonic, sonic, or ultrasonic vibrations for measuring contours or curvatures
• G01B 5/207 - Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
• G01B 5/28 - Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
• G01N 29/04 - Analysing solids
• G01N 33/46 - Wood