METHOD OF MEASURING THE MOVEMENT OF A MATERIAL SHEET AND OPTICAL SENSOR FOR PERFORMING THE METHOD

• Main Authors: MIMNAGH-KELLEHER, GILLIAN, A, LIESS, MARTIN, D
• Format: Patent
• Language: English; French
• Published: 10.05.2002
• Edition: 7
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; BASIC ELECTRIC ELEMENTS; CALCULATING; COMPUTING; CONVEYING; COUNTING; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC DIGITAL DATA PROCESSING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PACKING; PERFORMING OPERATIONS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SEMICONDUCTOR DEVICES; STORING; TESTING; TRANSPORTING

Measurements on a sheet (12), for example measurement of the movement of the sheet in a printer, can be performed by directing a measuring beam (8) towards the sheet and utilizing the effects of self-mixing in a diode laser (2) and Doppler shift in the measuring beam caused by the movement. The measuring method and a dedicated, cheap and compact, sheet sensor (1) may be used for determining different parameters and in different sheet processing apparatus. Selon l'invention, il est possible d'exécuter des mesures sur une feuille (12), par exemple la mesure du déplacement d'une feuille dans une imprimante, en dirigeant un faisceau de mesure (8) vers la feuille et en utilisant les effets du mélange automatique dans une diode laser (2) et du décalage Doppler dans le faisceau de mesure, provoqués par le déplacement. Il est possible d'utiliser ce procédé de mesure, ainsi qu'un capteur de feuille (1), spécialisé, bon marché et compact, pour déterminer différents paramètres, et ce dans divers appareils de traitement de feuilles.