Boots – shoes – and leggings
Patent
1994-10-24
1996-05-14
Envall, Jr., Roy N.
Boots, shoes, and leggings
395900, 395904, 2191216, G06F 1900
Patent
active
055174205
ABSTRACT:
There is provided a method and apparatus for controlling, in real-time, processing variables in laser processing of materials using fuzzy logic control procedures by embedding expertise in the form of a rule base within a fuzzy logic controller. The method uses a visible light detector as part of the control loop to detect light from the laser-material interaction zone. The light is processed to extract spatial information on the size of the interaction zone and in one aspect determines the number of bright pixels above a pre-defined number which effectively gives the spatial extent or area of the visible light emitted from the interaction zone. From this elemental processing two system input variables are obtained, namely the current number of bright pixels, #BP, and the change in this count since the last calculation, .DELTA.BP. These Input variables are input to the fuzzy logic controller for an inference pass with the output being used to control a laser processing variable such as laser power, laser intensity and process speed. More than two system input variables may be used to provide greater stability, integrating the fuzzy logic controller with the image processor provides control of penetration welding of steel plate at a rate of 28 Hz.
REFERENCES:
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Laser Process Monitoring with Dual Wavelength Optical Sensors; H. B. Chen, L. Li, D. J. Brookfield, K. Williams and W. M. Steen; Department of Mechanical Engineering University of Liverpool, Liverpool L69 3BX U.K.: ICALEO (1991): SPIE vol. 1722: pp. 113-122; Nov. 3-8, 1991, San Jose Convention Center, San Jose, California.
Intelligent Laser Welding Control; F. F. Farson, K. S. Fang, J. Kern: Applied Research Laboratory, The Pennsylvania State University State College , Pennsylvania USA; The International Society for Optical Engineering; SPIE vol. 1722; pp. 104-112; Nov. 3-8, 1991, San Jose Convention Center, San Jose, California.
Duley Walter W.
Kinsman Grant
Envall Jr. Roy N.
Garland Steven R.
Powerlasers Ltd.
Schumacher Lynn C.
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