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1. 发明申请

WO2009044387A3 A MULTIPOINT LASER DOPPLER VIBROMETER 审中-公开
标题翻译：多点激光多普勒振荡器
公开(公告)号：WO2009044387A3
公开(公告)日：2009-06-18
申请号：PCT/IE2008000095
申请日：2008-10-02
申请人： DUBLIN INST OF TECHNOLOGY , UNIV LIMERICK , EUROP ECONOMIC COMMUNITY , TOAL VINCENT , WHELAN MAURICE , CONNELLY MICHAEL , MARTIN SUZANNE , GUNTAKA TULASI SRIDHAR REDDY
发明人： TOAL VINCENT , WHELAN MAURICE , CONNELLY MICHAEL , MARTIN SUZANNE , GUNTAKA TULASI SRIDHAR REDDY
IPC分类号： G01H9/00
CPC分类号： G01H9/00 , G01H9/002
摘要： A multipoint laser Doppler vibrometer system (1) comprises a laser diode (2), beam expanding lens (3), a holographic optical element (HOE, 4) and a CMOS camera (5) receiving reflected light via optics (6). The HOE (4) is a hologram of a flat diffusely reflecting surface. Some light (8) is diffracted by the recorded hologram in the HOE (4) to provide a reference beam of light that is directed back towards the camera (5). Apart from some absorption the remaining light (9) continues onwards to illuminate the object The light that is reflected and scattered from the object (10) passes efficiently through the HOE (4) and interferes with the reference light (8) that is holographically reconstructed by the HOE (4) and subsequently detected by the camera (5). The beam from the laser diode (2) is divergent, which means that the sensitivity vector varies across the field of view. Thus the system is sensitive to both in-plane and out-of-plane motion of the object to an extent that depends on position of the object points. An alternative system (20) has two emission lenses (22, 23). The HOE (21) either redirects light already collimated by the lens combination (22, 23) or both redirects and collimates uncollimated light in such a way as to illuminate the object along the normal to its surface.
摘要翻译：多点激光多普勒测振系统（1）包括激光二极管（2），扩束透镜（3），全息光学元件（HOE，4）和通过光学器件（6）接收反射光的CMOS照相机（5）。 HOE（4）是平坦的漫反射表面的全息图。一些光（8）被HOE（4）中记录的全息图衍射，以提供引导回相机（5）的参考光束。除了一些吸收之外，剩余的光（9）继续向上以照亮物体。从物体（10）反射和散射的光有效地穿过HOE（4）并干扰全息重构的参考光（8）由HOE（4）通过照相机（5）检测。来自激光二极管（2）的光束是发散的，这意味着灵敏度矢量在整个视野范围内变化。因此，系统对物体的平面内和平面外的运动敏感，取决于对象点的位置。替代系统（20）具有两个发射透镜（22,23）。 HOE（21）或者重定向已经被透镜组合（22,23）准直的光或者两个重定向，并且以使得沿着其表面的法线照射物体的方式准直未经准备的光。

2. 发明申请

WO02052242A3 METHOD AND APPARATUS FOR CRACK AND FRACTURE DETECTION UTILIZING BRAGG GRATINGS 审中-公开
标题翻译：用于利用布拉格光栅进行裂缝和断裂检测的方法和设备
公开(公告)号：WO02052242A3
公开(公告)日：2002-09-19
申请号：PCT/IB0102806
申请日：2001-12-19
申请人： EUROP ECONOMIC COMMUNITY , KENNY ROBERT PATRICK , WHELAN MAURICE PATRICK
发明人： KENNY ROBERT PATRICK , WHELAN MAURICE PATRICK
IPC分类号： G01B11/00 , G01M11/00 , G01M11/08
CPC分类号： G01M11/083
摘要： Methods, and corresponding apparatus, for detecting the occurrence of cracks or fractures are described and claimed. The methods utilize Bragg gratings, and the occurrence of a crack is detected by detecting a change in the reflectance and/or transmittance characteristics of the Bragg grating when the crack is transmitted to it. In addition to merely detecting that a crack has occurred, the methods may also provide information on the position of the fracture along the length of the Bragg grating. This may be achieved by comparing the peak intensities and/or widths of the optical reflectance spectra of the unbroken and broken grating. In certain preferred embodiments the Bragg gratings are interrogated using the combination of a broad band source and an optical spectrum analyser, or a tunable laser source and a broad band detector.
摘要翻译：描述并要求保护的用于检测裂缝或裂缝的发生的方法和相应的装置。这些方法利用布拉格光栅，并且通过检测裂纹传播到布拉格光栅的反射率和/或透射率特性的变化来检测裂纹的发生。除了仅检测到裂纹已经发生之外，这些方法还可以提供关于沿着布拉格光栅的长度的裂缝的位置的信息。这可以通过比较不间断和破碎光栅的光学反射光谱的峰值强度和/或宽度来实现。在某些优选实施例中，使用宽带光源和光谱分析仪，或可调谐激光源和宽带检测器的组合来询问布拉格光栅。

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