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    System and method to decrease probe size for improved laser ultrasound detection
    1.
    发明授权
    System and method to decrease probe size for improved laser ultrasound detection 失效
    减少探针尺寸的系统和方法，以改善激光超声检测

    公开(公告)号：US07576848B2

    公开(公告)日：2009-08-18

    申请号：US11018994

    申请日：2004-12-21

    申请人： Marc Dubois ,  Thomas E. Drake, Jr. ,  Pavel Fomitchov

    发明人： Marc Dubois ,  Thomas E. Drake, Jr. ,  Pavel Fomitchov

    IPC分类号： G01N21/00

    CPC分类号： G01N21/474 ,  G01N21/1702 ,  G01N29/2418

    摘要： The present invention provides a compact optical probe assembly that measures ultrasound in materials. The probe uses angle-terminated optical fiber to direct illumination laser light at the surface of a remote target. Ultrasonic displacements at the surface scatter the illumination laser light. Angle-terminated optical fibers collect phase modulated light and direct the phase modulated light to an optical processor to produce a signal representative of the ultrasonic surface displacements. The probe may also incorporate angle-terminated optical fibers to direct generation laser light to the surface of a remote target to generate ultrasonic surface displacements. Optional shared beam forming element(s) may optically act on the illumination laser and collected phase modulated light.

    摘要翻译： 本发明提供一种测量材料中的超声波的紧凑型光学探针组件。 探头使用角度端接的光纤将照明激光引导到远程目标的表面。 表面的超声波位移散射照明激光。 角度端接的光纤收集相位调制的光并将相位调制的光引导到光学处理器以产生代表超声表面位移的信号。 探针还可以包括角度端接的光纤以将生成的激光引导到远程目标的表面以产生超声表面位移。 可选的共享波束形成元件可以光学地作用于照明激光器和收集的相位调制光。

    Fiber-based mid-infrared generation laser for laser ultrasound inspection
    2.
    发明授权
    Fiber-based mid-infrared generation laser for laser ultrasound inspection 有权
    用于激光超声波检测的基于光纤的中红外发生激光

    公开(公告)号：US07800762B2

    公开(公告)日：2010-09-21

    申请号：US11524046

    申请日：2006-09-20

    申请人： John B. Deaton, Jr. ,  Marc Dubois ,  Kenneth R. Yawn ,  Jeffery E. Maestas ,  Thomas E. Drake, Jr.

    发明人： John B. Deaton, Jr. ,  Marc Dubois ,  Kenneth R. Yawn ,  Jeffery E. Maestas ,  Thomas E. Drake, Jr.

    IPC分类号： G01B11/02

    CPC分类号： G01N29/2418 ,  G01N2291/0231

    摘要： Embodiments of the present invention relate to a laser system and method for the optical generation of ultrasound at a remote target. This involves generating a pump laser beam with a diode-pumped fiber laser. The diode pumped fiber laser is fiber-coupled with an optical fiber, either passive or diode pumped, to a generation laser head. The generation laser head generates a generation laser beam from the pump laser beam and directs the generation laser beam to the surface of the remote target. The interaction between generation laser beam and the surface of the remote target results in ultrasonic displacements at the remote target. These ultrasonic displacements may be sampled in order to assess and inspect the remote target.

    摘要翻译： 本发明的实施例涉及一种用于在远程目标处产生超声波的激光系统和方法。 这涉及用二极管泵浦的光纤激光器产生泵浦激光束。 二极管泵浦光纤激光器与被泵浦或无源二极管的光纤耦合到一代激光头。 一代激光头从泵浦激光束产生一代激光束并将生成的激光束引导到远程靶的表面。 发射激光束和远程目标表面之间的相互作用导致远程目标的超声波位移。 可以对这些超声波位移进行采样，以评估和检查远程目标。

    System and method of determining porosity in composite materials using ultrasound
    3.
    发明授权
    System and method of determining porosity in composite materials using ultrasound 有权
    使用超声波测定复合材料孔隙度的系统和方法

    公开(公告)号：US06684701B2

    公开(公告)日：2004-02-03

    申请号：US09905444

    申请日：2001-07-13

    申请人： Marc Dubois ,  John B. Deaton, Jr. ,  Peter W. Lorraine ,  Thomas E. Drake, Jr. ,  Robert J. Filkins

    发明人： Marc Dubois ,  John B. Deaton, Jr. ,  Peter W. Lorraine ,  Thomas E. Drake, Jr. ,  Robert J. Filkins

    IPC分类号： G01H100

    CPC分类号： G01N29/30 ,  G01N29/11 ,  G01N29/2418 ,  G01N29/449 ,  G01N29/46 ,  G01N2291/014 ,  G01N2291/0231 ,  G01N2291/0245 ,  G01N2291/0289 ,  G01N2291/0421 ,  G01N2291/044

    摘要： The invention provides for ultrasonically measuring the porosity in a sample composite material by accessing only one side of the sample composite material and includes the steps of measuring a sample ultrasonic signal from the sample composite material, normalizing the sample ultrasonic signal relative to the surface echo of the sample composite material, and isolating a sample back-wall echo signal from the sample ultrasonic signal. A sample frequency spectrum of the sample back-wall ultrasonic signal is then determined. Next, the method and system include the steps of measuring a reference ultrasonic signal from a reference composite material, normalizing the reference ultrasonic signal relative to the surface echo of the reference composite material; and isolating a reference back-wall echo signal from the sample ultrasonic signal. A reference frequency spectrum of the reference back-wall ultrasonic signal is then determined. The invention further includes deriving the ultrasonic attenuation of the sample ultrasonic signal as the ratio of the sample frequency spectrum to the reference frequency spectrum over a predetermined frequency range. Comparing the derived ultrasonic attenuation to predetermined attenuation standards permits evaluating the porosity of the sampled composite material.

    摘要翻译： 本发明提供了通过仅访问样品复合材料的一侧来超声波测量样品复合材料中的孔隙率，并且包括以下步骤：从样品复合材料测量样品超声波信号，使样品超声信号相对于表面回波归一化 样品复合材料，并从样品超声波信号中分离样品后壁回波信号。 然后确定样品后壁超声波信号的采样频谱。 接下来，该方法和系统包括以下步骤：从参考复合材料测量参考超声波信号，使参考超声信号相对于参考复合材料的表面回波标准化; 并从样本超声波信号隔离参考后壁回波信号。 然后确定参考后壁超声波信号的参考频谱。 本发明还包括将样本超声波信号的超声波衰减导出为在预定频率范围内的采样频谱与参考频谱的比率。 将得到的超声波衰减与预定的衰减标准进行比较，可以评估采样的复合材料的孔隙率。

    System and method to inspect components having non-parallel surfaces
    4.
    发明授权
    System and method to inspect components having non-parallel surfaces 有权
    检查具有不平行表面的部件的系统和方法

    公开(公告)号：US07369250B2

    公开(公告)日：2008-05-06

    申请号：US11089902

    申请日：2005-03-25

    申请人： Marc Dubois ,  Thomas E. Drake, Jr.

    发明人： Marc Dubois ,  Thomas E. Drake, Jr.

    IPC分类号： G01B11/02 ,  G01B9/02 ,  G01N21/00

    CPC分类号： G01N21/1717 ,  G01H9/00 ,  G01N29/2418 ,  G01N2291/0423 ,  G01N2291/0425 ,  G01N2291/044

    摘要： The present invention provides a method to detect and generate ultrasonic displacements at a remote target for ultrasonic inspection. This method involves generating an ultrasonic wave at a first location on an upper surface of the remote target. This ultrasonic wave is reflected from interior surfaces within the remote target wherein the reflected ultrasonic wave produces ultrasonic displacement at a second location on the upper surface of the remote target. A detection laser beam is generated and directed to the second location on the upper surface of the remote target. Here, the detection laser beam is scattered by the ultrasonic displacements to produce phase-modulated light. This phase-modulated light is collected and processed to obtain data representative of the ultrasonic surface displacements. Further, these ultrasonic displacements, when processed, will yield inspection information associated with the interior of the remote target.

    摘要翻译： 本发明提供一种在超声波检查的远程目标处检测和产生超声波位移的方法。 该方法涉及在远程目标的上表面上的第一位置处产生超声波。 该超声波从远程目标内的内表面反射，其中反射的超声波在远程目标的上表面上的第二位置处产生超声波位移。 生成检测激光束并将其引导到远程目标的上表面上的第二位置。 这里，检测激光束被超声波位移散射以产生相位调制光。 收集并处理该相位调制光以获得代表超声表面位移的数据。 此外，这些超声波位移在被处理时将产生与远程目标的内部相关联的检查信息。

    System and method to reduce laser noise for improved interferometric laser ultrasound detection
    7.
    发明授权
    System and method to reduce laser noise for improved interferometric laser ultrasound detection 有权
    减少激光噪声的系统和方法，用于改进干涉激光超声检测

    公开(公告)号：US07474411B2

    公开(公告)日：2009-01-06

    申请号：US10703655

    申请日：2003-11-07

    申请人： Marc Dubois ,  Kent C. Burr ,  Thomas E. Drake, Jr. ,  Peter W. Lorraine

    发明人： Marc Dubois ,  Kent C. Burr ,  Thomas E. Drake, Jr. ,  Peter W. Lorraine

    IPC分类号： G01B9/02

    CPC分类号： G01H9/00

    摘要： The present invention provides an optical filter assembly that reduces the phase and amplitude noise of a detection laser used to detect ultrasonic displacements. The filtered detection laser is directed to the surface of a remote target. Ultrasonic displacements at the surface scatter the filtered detection laser. Collection optics then gather phase modulated light scattered by the surface and direct the phase modulated light to an optical processor to produce a signal representative of the ultrasonic displacements with an improved SNR. Additional processors may determine the structure of the remote target.

    摘要翻译： 本发明提供一种滤光器组件，其减少用于检测超声波位移的检测激光器的相位和幅度噪声。 滤波的检测激光器被引导到远程目标的表面。 表面上的超声波位移散射了滤波的检测激光。 收集光学器件然后收集由表面散射的相位调制光，并将相位调制光引导到光学处理器以产生表示具有改善的SNR的超声波位移的信号。 附加处理器可以确定远程目标的结构。

    Mid-IR laser for generation of ultrasound
    9.
    发明授权
    Mid-IR laser for generation of ultrasound 有权
    用于产生超声的中红外激光

    公开(公告)号：US08064488B2

    公开(公告)日：2011-11-22

    申请号：US12120949

    申请日：2008-05-15

    申请人： Thomas E. Drake, Jr. ,  Marc Dubois ,  Peter W. Lorraine ,  John B. Deaton, Jr. ,  Robert Filkins

    发明人： Thomas E. Drake, Jr. ,  Marc Dubois ,  Peter W. Lorraine ,  John B. Deaton, Jr. ,  Robert Filkins

    IPC分类号： H01S3/30

    CPC分类号： G01N21/1702 ,  G01N2021/1706 ,  G01N2021/8472

    摘要： A compact high average power mid infrared range laser for ultrasound inspection. The laser comprises one of a Nd:YAG or Yb:YAG laser pumped by a diode at 808 nm to produce a 1 micron output beam. The 1 micron output beam is directed to an optical parametric oscillator where the beam wavelength is converted to 1.94 microns and conveyed to a mid infrared emission head. The emission head comprises one of a Ho:YAG or Ho:YLG laser optically coupled with a second optical parametric oscillator. The second optical parametric oscillator forms a generation output beam for creating ultrasonic displacements on a target. The generation output beam wavelength ranges from about 3 to about 4 microns, and can be 3.2 microns.

    摘要翻译： 用于超声检查的紧凑型高平均功率中红外范围激光。 激光器包括由二极管在808nm泵浦的Nd：YAG或Yb：YAG激光器中的一个，以产生1微米的输出光束。 1微米输出光束被引导到光学参数振荡器，其中波束波长被转换为1.94微米并被传送到中红外发射头。 发射头包括与第二光学参量振荡器光学耦合的Ho：YAG或Ho：YLG激光器之一。 第二光参量振荡器形成用于在目标上产生超声波位移的生成输出光束。 产生输出光束波长范围为约3至约4微米，并且可以为3.2微米。