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1. (WO1991007653) A METHOD AND APPARATUS FOR DETECTING BARK AND FOR DETERMINING THE DEGREE OF BARKING ON WOOD AND CHIPS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007653 International Application No.: PCT/SE1990/000728
Publication Date: 30.05.1991 International Filing Date: 09.11.1990
Chapter 2 Demand Filed: 03.06.1991
IPC:
G01N 21/898 (2006.01) ,G01N 33/34 (2006.01) ,G01N 33/46 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
84
Systems specially adapted for particular applications
88
Investigating the presence of flaws, defects or contamination
89
in moving material, e.g. paper, textiles
892
characterised by the flaw, defect or object feature examined
898
Irregularities in textured or patterned surfaces, e.g. textiles, wood
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
34
Paper
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
46
Wood
Applicants:
STFI [SE/SE]; Box 5604 S-114 86 Stockholm, SE (AllExceptUS)
JOHANSSON, Lennart [SE/SE]; SE (UsOnly)
RINGSTRÖM, Leif [SE/SE]; SE (UsOnly)
Inventors:
JOHANSSON, Lennart; SE
RINGSTRÖM, Leif; SE
Agent:
ONN, Thorsten ; AB Stockholms Patentbyrå, Zacco & Bruhn Box 23101 S-104 35 Stockholm, SE
Priority Data:
8903821-014.11.1989SE
Title (EN) A METHOD AND APPARATUS FOR DETECTING BARK AND FOR DETERMINING THE DEGREE OF BARKING ON WOOD AND CHIPS
(FR) PROCEDE ET APPRAREIL DE DETECTION D'ECORCE, ET DE DETERMINATION DU DEGRE D'ECORCAGE DE BOIS ET DE COPEAUX
Abstract:
(EN) The present invention relates to a method and to an apparatus for detecting the presence of bark and for determining the barking degree of wood or chips. Accordingly, the apparatus includes a light source (12) which directs a concentrated light beam (14) onto the measurement object (16), for instance a log which is moved continuously in a transport chute (20). The shape and/or size of the light image obtained on the log (16) at the point (18) on which the light beam (14) impinges on the log is detected with the aid of a camera (10), preferably a CCD-camera. The shape and/or size of the light image is mutually different for wood and bark. The detection values obtained by the CCD-camera (10) are evaluated in a processing means.
(FR) Procédé et appareil de détection de la présence d'écorce, et de détermination du degré d'écorçage de bois ou de copeaux. L'appareil comprend une source de lumière (12) orientant un faisceau de lumière concentré (14) sur l'objet de mesure (16), par exemple un rondin déplacé de manière continue dans un couloir de transport (20). La forme et/ou la taille de l'image de lumière obtenue sur le rondin (16) au niveau du point (18) sur lequel le faisceau de lumière (14) est incident sur le rondin, est détectée à l'aide d'une caméra (10) de préférence une caméra à charge couplée. La forme et/ou la taille de l'image de lumière sont mutuellement différentes pour le bois et pour l'écorce. Les valeurs de détection obtenues par la caméra à charge couplée (10) sont évaluées dans un moyen de traitement.
Designated States: CA, DE, ES, FI, JP, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI922179EP0502041US5274244JPH05503990CA2068650DE000069025408