Acoustic tree and wooden member imaging apparatus

Details Acoustic tree and wooden member imaging apparatus Acoustic tree and wooden member imaging apparatus

G - Physics

01

N

G01N 29/06 (2006.01) G01N 29/07 (2006.01) G01N 29/11 (2006.01) G01N 33/46 (2006.01)

Patent

CA 2321525

An ultrasonic computed tomography tree or log scanner has a plurality of ultrasonic transceivers carried on a belt (102) sized to encircle a tree (100). The belt includes an apparatus for engaging it tightly around the tree (104). The transceivers are strapped around the tree, and their mutual relative distances are known. Electronic circuitry energizes the transmitters in a known sequence. The signals received at each of the receivers are also collected and analyzed. Computed tomographic techniques analyze the time of arrival of the acoustic pulse that is first to arrive at each receiver. A signal processor generates a two-dimensional image of a slice of the tree (110) at the locus of the belt.

L'invention concerne un appareil de balayage tomographique informatisé, à ultrasons, pour arbre ou grume comprenant une pluralité d'émetteurs-récepteurs à ultrasons disposés sur une ceinture (102) dont les dimensions permettent d'entourer un arbre (100). La ceinture comprend un appareil qui coopère étroitement avec l'arbre (104). Les émetteurs-récepteurs sont attachés autour de l'arbre, et on connaît leurs distances relatives mutuelles. Un circuit électronique met les émetteurs sous tension dans une séquence connue. Les signaux reçus par chaque récepteur sont également collectés et analysés. Les techniques tomographiques informatisées analysent le moment d'arrivée de l'impulsion acoustique qui arrive la première sur chaque récepteur. Un processeur de signal produit une image en deux dimensions d'une pièce de l'arbre (110) à l'emplacement de la ceinture.

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