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1. 发明授权

US06188041B1 Method and apparatus for real-time weld process monitoring in a pulsed laser welding 失效
标题翻译：脉冲激光焊接中实时焊接过程监控的方法和装置
公开(公告)号：US06188041B1
公开(公告)日：2001-02-13
申请号：US09190234
申请日：1998-11-13
申请人： Cheol-Jung Kim , Min-Suk Kim , Sung-Hoon Baik , Chin-Man Chung
发明人： Cheol-Jung Kim , Min-Suk Kim , Sung-Hoon Baik , Chin-Man Chung
IPC分类号： B23K2600
CPC分类号： B23K26/034 , B23K26/04 , B23K26/0643 , B23K26/0665
摘要： A method and apparatus for real-time weld process monitoring are provided for a pulsed laser welding. The thermal radiation from a weld pool is measured at several spectral bands through an aperture with single-element detectors after splitting the spectral bands with dichromatic mirrors and beam splitters. The distal end of an optical fiber for laser delivery can be used as an aperture and each spectral band signal is measured with a single-element detector. Due to the chromatic aberration of an imaging optics, the field of view from a single-element detector through the aperture is varied by the wavelength of spectral band. The weld pool size contributing to the spectral band signal varies by the wavelength of the spectral band. The transmittance profile of each spectral band also depends on the focus shift of imaging optics. By processing the measured spectral band signals, the size of a weld pool, the power variation on a workpiece and the focus shift of imaging optics can be monitored simultaneously. Furthermore, the weld pool sizes at predetermined positions in time are correlated to the weld depth and the weld defect such as a weld gap for weld quality assurance.
摘要翻译：为脉冲激光焊接提供了实时焊接过程监控的方法和装置。在使用双色镜和分束器分割光谱带之后，通过具有单元件检测器的孔径在几个光谱带处测量来自熔池的热辐射。用于激光输送的光纤的远端可以用作孔径，并且每个光谱带信号都用单元件检测器测量。由于成像光学元件的色差，来自单元件检测器通过孔径的视场由光谱带的波长变化。有助于光谱带信号的焊池尺寸随光谱带的波长而变化。每个光谱带的透射率分布也取决于成像光学元件的聚焦偏移。通过处理测量的光谱带信号，可以同时监测焊池的尺寸，工件上的功率变化和成像光学器件的聚焦偏移。此外，预定位置的焊池尺寸与焊接深度和焊接缺陷（例如用于焊接质量保证的焊接间隙）相关。

2. 发明申请

US20090237643A1 Laser Doppler Velocity System for Variable Beam Focusing 有权
标题翻译：用于可变光束聚焦的激光多普勒速度系统
公开(公告)号：US20090237643A1
公开(公告)日：2009-09-24
申请号：US12405999
申请日：2009-03-17
申请人： Seok-Kyu Chang , Sung-Hoon Baik , Chul-Hwa Song
发明人： Seok-Kyu Chang , Sung-Hoon Baik , Chul-Hwa Song
IPC分类号： G01P3/36
CPC分类号： G01M9/065 , G02B3/14 , G02B26/005
摘要： Disclosed is a laser doppler velocity system that can easily change a focal length of laser beam, in order to measure the velocity of fluid. As the fluid lens is used in order to focus the laser beam, the lens aperture is rapidly and accurately changed at a low power to easily measure the flow-velocity and shear stress of the boundary layer of the structure within the flow field. As the optical array including the fluid lens is integrated using a diode laser as a laser light source, the laser doppler velocity system can be made in small-size. Also, as the laser doppler velocity system is inserted into the surface of the structure, it can be used as a surface flow field measurement sensor.
摘要翻译：公开了一种激光多普勒速度系统，其可以容易地改变激光束的焦距，以便测量流体的速度。由于使用流体透镜来聚焦激光束，因此以低功率快速准确地改变透镜孔径，以容易地测量流场内结构边界层的流速和剪切应力。由于使用二极管激光器作为激光源将包括流体透镜的光学阵列集成在一起，所以可以制造小型的激光多普勒速度系统。此外，由于激光多普勒速度系统被插入到结构的表面中，所以可以用作表面流场测量传感器。

3. 发明授权

US6046812A Shape-measuring laser apparatus using anisotropic magnification optics 失效
标题翻译：使用各向异性放大光学元件的形状测量激光设备
公开(公告)号：US6046812A
公开(公告)日：2000-04-04
申请号：US166418
申请日：1998-10-05
申请人： Sung-Hoon Baik , Seung-Kyu Park , Cheol-Jung Kim
发明人： Sung-Hoon Baik , Seung-Kyu Park , Cheol-Jung Kim
IPC分类号： G01B11/25 , G01B11/24
CPC分类号： G06T7/0057 , G01B11/25
摘要： The present invention relates to an apparatus for measuring surface relief profile of an object by projecting a line-shaped laser sheet beam in triangulation method and anisotropic magnification optics for improving the measurement resolution. The purpose of the present invention is to provide a system or an apparatus capable of measuring relief profiles with anisotropic magnification optics composed with one or more positive and one or more negative cylindrical lenses, which allows it to obtain magnified images along the direction vertical to the length-wise direction of the image of a line-shaped laser sheet beam for higher resolution in the relief profile measurements along the direction parallel to the length-wise direction of a line-shaped laser sheet beam image to measure the same range of area as the range without anisotropic magnification optics.
摘要翻译：本发明涉及一种用于通过在三角测量方法和各向异性放大光学器件中投射线状激光束光束来改善测量分辨率来测量物体的表面凹凸轮廓的装置。本发明的目的是提供一种能够利用由一个或多个正的和一个或多个负的柱面透镜组成的各向异性放大光学元件来测量浮雕轮廓的系统或装置，这允许它沿垂直于沿着平行于线状激光束光束图像的长度方向的方向的平面轮廓测量中的用于更高分辨率的线状激光片光束的图像的长度方向，以测量与无范围放大光学范围。

4. 发明授权

US06555780B1 Method for monitoring the size variation and the focus shift of a weld pool in laser welding 失效
标题翻译：用于监测激光焊接中焊池的尺寸变化和聚焦位移的方法
公开(公告)号：US06555780B1
公开(公告)日：2003-04-29
申请号：US10006140
申请日：2001-12-10
申请人： Cheol-Jung Kim , Sung-Hoon Baik , Min-Suk Kim , Chin-Man Chung
发明人： Cheol-Jung Kim , Sung-Hoon Baik , Min-Suk Kim , Chin-Man Chung
IPC分类号： B23K2620
CPC分类号： B23K26/032 , B23K26/03 , B23K26/034
摘要： In a laser welding, a laser beam is focused on a workpiece by a focusing lens or lenses. The focusing lens or lenses image an aperture liming the size of the laser beam on the workpiece and the size of focused laser beam is the image size of the aperture on the workpiece at the wavelength of the laser. A weld pool is generated by the interaction of the focused laser beam and the workpiece. Due to the thermal conduction of the workpiece, the size of the weld pool is generally not the same as the size of the focused laser beam and varies with the power of the laser or with the focus shift of the focusing lens or lenses. The weld pool irradiates a thermal radiation. The thermal radiation is measured back through the focusing lens or lenses and through the aperture limiting the size of the laser beam or any other aperture limiting a size of the thermal radiation to be measured in three spectral bands with single element detectors. Due to the chromatic aberration of the focusing lens or lenses, the transmittance of each spectral band of the thermal radiation varies with the size variation and with the focus position of a weld pool and the spectral band signals measured with single-element detectors vary if the size and/or the focus position of a weld pool varies. However, the chromatic aberration of the focusing lens or lenses is usually unknown and is not easy to measure. A method to monitor the size variation and/or the focus position of a weld pool is disclosed wherein the effects of the chromatic aberration are measured experimentally and the size variation of a weld pool is monitored independently from the focus shift of the focusing lens or lenses and the focus position of a weld pool is monitored independently from the power variation of the laser.
摘要翻译：在激光焊接中，激光束通过聚焦透镜聚焦在工件上。聚焦透镜或透镜对激光束在工件上的尺寸进行成像，并且聚焦激光束的尺寸是在激光波长处工件上的孔径的图像尺寸。焊池由聚焦激光束与工件的相互作用产生。由于工件的热传导，熔池的尺寸通常与聚焦的激光束的尺寸不同，并随着激光的功率或聚焦透镜的聚焦偏移而变化。焊接池照射热辐射。通过聚焦透镜或透镜测量热辐射，并通过孔径限制激光束或任何其他孔径的尺寸，以单个元件检测器限制三个光谱带中待测量的热辐射的尺寸。由于聚焦透镜或透镜的色差，热辐射的每个光谱带的透射率随着尺寸变化和焊池的焦点位置而变化，并且用单元件检测器测量的光谱带信号变化如果焊池的尺寸和/或焦点位置不同。然而，聚焦透镜或透镜的色差通常是未知的并且不容易测量。公开了一种用于监测焊池的尺寸变化和/或焦点位置的方法，其中色差的影响通过实验测量，并且独立于聚焦透镜或聚焦透镜的聚焦偏移监测焊池的尺寸变化并且独立于激光器的功率变化监测焊池的聚焦位置。

5. 发明授权

US08120756B2 Laser doppler velocity system for variable beam focusing 有权
标题翻译：用于可变光束聚焦的激光多普勒速度系统
公开(公告)号：US08120756B2
公开(公告)日：2012-02-21
申请号：US12405999
申请日：2009-03-17
申请人： Seok-Kyu Chang , Sung-Hoon Baik , Chul-Hwa Song
发明人： Seok-Kyu Chang , Sung-Hoon Baik , Chul-Hwa Song
IPC分类号： G01C3/08
CPC分类号： G01M9/065 , G02B3/14 , G02B26/005
摘要： Disclosed is a laser doppler velocity system that can easily change a focal length of laser beam, in order to measure the velocity of fluid. As the fluid lens is used in order to focus the laser beam, the lens aperture is rapidly and accurately changed at a low power to easily measure the flow-velocity and shear stress of the boundary layer of the structure within the flow field. As the optical array including the fluid lens is integrated using a diode laser as a laser light source, the laser doppler velocity system can be made in small-size. Also, as the laser doppler velocity system is inserted into the surface of the structure, it can be used as a surface flow field measurement sensor.
摘要翻译：公开了一种激光多普勒速度系统，其可以容易地改变激光束的焦距，以便测量流体的速度。由于使用流体透镜来聚焦激光束，因此以低功率快速准确地改变透镜孔径，以容易地测量流场内结构边界层的流速和剪切应力。由于使用二极管激光器作为激光源将包括流体透镜的光学阵列集成在一起，所以可以制造小型的激光多普勒速度系统。此外，由于激光多普勒速度系统被插入到结构的表面中，所以可以用作表面流场测量传感器。

6. 发明授权

US06344625B1 Method and apparatus for monitoring the size variation and the focus shift of a weld pool in laser welding 失效
标题翻译：用于监测激光焊接中焊池的尺寸变化和聚焦偏移的方法和装置
公开(公告)号：US06344625B1
公开(公告)日：2002-02-05
申请号：US09589134
申请日：2000-06-08
申请人： Cheol-Jung Kim , Sung-Hoon Baik , Min-Suk Kim , Chin-Man Chung
发明人： Cheol-Jung Kim , Sung-Hoon Baik , Min-Suk Kim , Chin-Man Chung
IPC分类号： B23K2620
CPC分类号： B23K26/032 , B23K26/034 , B23K26/04
摘要： In a laser welding, a laser beam is focused on a workpiece by a focusing lens or lenses. The focusing lens or lenses image an aperture liming the size of the laser beam on the workpiece and the size of focused laser beam is the image size of the aperture on the workpiece at the wavelength of the laser. A weld pool is generated by the interaction of the focused laser beam and the workpiece. Due to the thermal conduction of the workpiece, the size of the weld pool is generally not the same as the size of the focused laser beam and varies with the power of the laser or with the focus shift of the focusing lens or lenses. The weld pool radiates a thermal radiation. An apparatus and method is disclosed wherein the thermal radiation is measured back through the focusing lens or lenses and through the aperture limiting the size of the laser beam or any other aperture limiting a size of the thermal radiation to be measured in at least three spectral bands with single element detectors. Due to the chromatic aberration of the focusing lens or lenses, the transmittance of each spectral band of the thermal radiation varies with the size variation and with the focus position of a weld pool and the spectral band signals measured with single-element detectors vary if the size and/or the focus position of a weld pool varies. Algorithm to monitor the size variation and/or the focus position of a weld pool is disclosed wherein the size variation of a weld pool is monitored independently from the focus shift of the focusing lens or lenses and the focus position of a weld pool is monitored independently from the power variation of the laser.
摘要翻译：在激光焊接中，激光束通过聚焦透镜聚焦在工件上。聚焦透镜或透镜对激光束在工件上的尺寸进行成像，并且聚焦激光束的尺寸是在激光波长处工件上的孔径的图像尺寸。焊池由聚焦激光束与工件的相互作用产生。由于工件的热传导，熔池的尺寸通常与聚焦的激光束的尺寸不同，并随着激光的功率或聚焦透镜的聚焦偏移而变化。焊接池辐射热辐射。公开了一种装置和方法，其中通过聚焦透镜或透镜测量热辐射，并通过孔径限制激光束或任何其它孔径的尺寸，以限制在至少三个光谱带中待测量的热辐射的尺寸与单元素检测器。由于聚焦透镜或透镜的色差，热辐射的每个光谱带的透射率随着尺寸变化和焊池的焦点位置而变化，并且用单元件检测器测量的光谱带信号变化如果焊池的尺寸和/或焦点位置不同。公开了监测焊池的尺寸变化和/或焦点位置的算法，其中独立于聚焦透镜或透镜的聚焦位移监测焊池的尺寸变化，并且独立地监测焊池的聚焦位置从激光的功率变化。

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