FLUFF MEASURING METHOD FOR SHEET-LIKE OBJECT AND MEASURING APPARATUS THEREFOR

• Main Authors: MATSUNO TSUTOMU, HOSONO SATOSHI
• Format: Patent
• Language: English
• Published: 12.12.1995
• Edition: 6
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PURPOSE:To quantitatively measure the number of fluff and the surface area of the fluff by radiating laser luminous fluxes, taking an image of a luminous part where the laser light rays are reflected disorderly by the fluffs, and analysing the image. CONSTITUTION:A conical reflection mirror is attached to the tip part of a semiconductor laser oscillator. The laser light rays are reflected and become slitted luminous fluxes 5 in a fan-shape and the vertical angle of the conical mirror is so set as to make the angle of the fan-shaped fluxes be 100 degrees and the thickness of the luminous fluxes be 2-3mm. The luminous fluxes and the surface of a paper sheet are so set as to form no gap between them. The luminous fluxes proceed in parallel to the surface of the paper sheet while being brought into contact with the surface of the paper sheet and an image of the bright point where the luminous fluxes impinge the fluffs K is taken by CCD camera from the upper side. The quantity of the light and the surface area of the formed image are photo-electrically converted and further A/D converted to quantitative digital signals. Then, the digital signals are converted to be binary values by a proper threshold, displayed as a two-dimension image by image processing, stored in a computer, and the number and the surface area of the fluffs K are measured based on the stored two-dimension image.