Method and apparatus for real-time control of laser processing of
materials
    1.
    发明授权
    Method and apparatus for real-time control of laser processing of materials 失效
    实时控制材料激光加工的方法和装置

    公开(公告)号:US5659479A

    公开(公告)日:1997-08-19

    申请号:US600108

    申请日:1996-02-12

    IPC分类号: B23K26/03 G05B13/02 G06F19/00

    摘要: 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.

    摘要翻译: 提供了一种用于通过以模糊逻辑控制器内的规则库的形式嵌入专业知识来实时控制材料的激光处理中的变量的方法和装置。 该方法使用可见光检测器作为控制回路的一部分来检测来自激光 - 材料相互作用区域的光。 处理光以提取关于相互作用区域的尺寸的空间信息,并且在一个方面确定高于预定数量的亮像素的数量,其有效地给出从相互作用区域发射的可见光的空间范围或面积。 从这个元素处理中获得两个系统输入变量,即当前亮度像素数#BP,以及自上次计算以来的这个计数的变化,DELTA BP。 这些输入变量被输入到模糊逻辑控制器用于推理通过,其输出用于控制诸如激光功率,激光强度和处理速度的激光处理变量。 可以使用两个以上的系统输入变量来提供更大的稳定性。 将模糊逻辑控制器与图像处理器集成,可以以28 Hz的速率控制钢板的焊接。

    Solid state artificial cornea and method for UV laser sculpting
    3.
    发明授权
    Solid state artificial cornea and method for UV laser sculpting 失效
    固态人造角膜和紫外激光雕刻方法

    公开(公告)号:US5387106A

    公开(公告)日:1995-02-07

    申请号:US864257

    申请日:1992-04-06

    IPC分类号: A61F9/01 G09B23/28

    摘要: An artificial cornea for sensing and integrating UV radiation in real time. The cornea includes an EPROM array adapted to be exposed to UV radiation. Individual bits of the EPROM array are set prior to being exposed to the UV radiation. In response to being exposed to the UV radiation predetermined ones of the individual bits are erased. Means for monitoring, in real time, the locations of the predetermined erased bits are provided and, in response, a record is formed of the energy distribution of the UV radiation across the EPROM array.

    摘要翻译: 一种用于实时感测和整合紫外线辐射的人造角膜。 角膜包括适于暴露于紫外线辐射的EPROM阵列。 在暴露于UV辐射之前,EPROM阵列的各个位被设置。 响应于暴露于UV辐射,预定的各个位被擦除。 提供用于实时监视预定擦除位的位置的装置,作为响应,由EPROM阵列上的UV辐射的能量分布形成记录。

    Laser-welding techniques using pre-heated tool and enlarged beam
    4.
    发明授权
    Laser-welding techniques using pre-heated tool and enlarged beam 失效
    激光焊接技术使用预热工具和扩大的光束

    公开(公告)号:US5814784A

    公开(公告)日:1998-09-29

    申请号:US381200

    申请日:1995-01-31

    IPC分类号: B23K26/06 B23K26/42 B23K26/00

    摘要: A laser processing method establishes initial coupling between the laser beam and workpiece by irradiating an intermediate tool positioned adjacent the workpiece. The tool is more absorptive at the laser wavelength than the workpiece so that the efficiency of energy transfer is increased. Subsequent processing is performed by relative movement between the workpiece and beam, either independently of the tool or in conjunction with the tool. During further processing, the beam diameter is increased to be greater than the thickness of the workpiece to enhance the further processing.

    摘要翻译: 激光处理方法通过照射位于工件附近的中间工具来建立激光束和工件之间的初始耦合。 该工具在激光波长下比工件更吸收,从而提高能量转移的效率。 随后的处理是通过工件和梁之间的相对运动进行的,无论是工具还是与工具结合在一起。 在进一步处理期间,光束直径增加到大于工件的厚度以增强进一步的处理。

    Method and apparatus for real-time control of laser processing of
materials
    5.
    发明授权
    Method and apparatus for real-time control of laser processing of materials 失效
    实时控制材料激光加工的方法和装置

    公开(公告)号:US5517420A

    公开(公告)日:1996-05-14

    申请号:US328762

    申请日:1994-10-24

    IPC分类号: B23K26/03 G05B13/02 G06F19/00

    摘要: 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.

    摘要翻译: 提供了一种用于通过以模糊逻辑控制器内的规则库的形式嵌入专业知识来实时控制材料的激光处理中的变量的方法和装置。 该方法使用可见光检测器作为控制回路的一部分来检测来自激光 - 材料相互作用区域的光。 处理光以提取关于相互作用区域的尺寸的空间信息,并且在一个方面确定高于预定数量的亮像素的数量,其有效地给出从相互作用区域发射的可见光的空间范围或面积。 从这个元素处理中获得两个系统输入变量,即当前亮度像素数#BP,以及自上次计算以来的这个计数的变化,DELTA BP。 这些输入变量被输入到模糊逻辑控制器用于推理通过,其输出用于控制诸如激光功率,激光强度和处理速度的激光处理变量。 可以使用两个以上的系统输入变量来提供更大的稳定性,将模糊逻辑控制器与图像处理器集成,以28Hz的速率提供对钢板的穿透焊接的控制。