METHOD AND SYSTEM FOR CONTROL OF A MATERIAL REMOVAL PROCESS USING SPECTRAL EMISSION DISCRIMINATION
摘要
<p>A method for removing material from a structure, comprising the steps of: (1) generating a light beam; (2) irradiating the surface material of a structure with the light beam having an intensity sufficient to ablate the surface material and to cause the surface material to generate spectral emission signals having intensities; (3) scanning the structure with the light beam at a scan speed; (4) monitoring the spectral emissions to detect a selected one of the spectral emission signals having a selected wavelength and generating an electronic output signal representative of the intensity of a selected one of the spectral emission signals in response to detecting the selected one of the spectral emission signals; (5) determining an updated scan speed functionally related to the electronic output signal; and (6) directing the scan speed to be equal to the updated scan speed. A second embodiment determines the updated scan speed based on the intensity of spectral emission signals detected during predetermined intervals while the structure is illuminated by the light source. A third embodiment determines an updated scan speed based on the intensity of spectral emission signals resulting from a laser pulse irradiating the structure when the output of the light beam is approximately at a minimum.</p>
申请公布号
EP0618850(B1)
申请公布日期
1996.07.17
申请号
EP19930901187
申请日期
1992.12.17
申请人
MAXWELL LABORATORIES, INC.
发明人
CATES, MICHAEL, CHRISTOPHER;HAMM, RICHARD, ROY;HOOGERWERF, JOHN, DAVID