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1. 发明授权

US4794249A Optical time domain reflectometer with heterodyne reception 失效
标题翻译：光学时域反射仪与外差接收
公开(公告)号：US4794249A
公开(公告)日：1988-12-27
申请号：US026797
申请日：1987-03-17
申请人： Friedrich-Karl Beckmann , Wolfgang Hoppe , Reinhard Knochel , Jurgen Kordts
发明人： Friedrich-Karl Beckmann , Wolfgang Hoppe , Reinhard Knochel , Jurgen Kordts
IPC分类号： G01M11/02 , G01M11/00 , G01N21/27 , G02F2/00 , H01J5/16
CPC分类号： G01M11/3172
摘要： The invention relates to an optical time domain reflectometer (OTDR) with heterodyne reception for determining the attentuation of an optical waveguide (measuring waveguide) by measuring the back-scattered portion of light pulses sent into the measuring waveguide. This structure is comprised of a modulated laser light source sending a send beam into the measuring waveguide and a laser light source which constitutes a local oscillator and transmits continuous light, on whose light of a wavelength differing by an intermediate-frequency from the back-scattered light from the transmission light source is superposed and is applied to a photodetector having an intermediate-frequency electric output signal which is filtered and evaluated. To improve the signal-to-noise ratio it is provided that the transmission light source is a transmission laser 1 whose light is influenced in consecutive time intervals (t.sub.1 to t.sub.2) such that the light frequency varies between two cut-off frequencies f.sub.L1 and f.sub.L2 and that the light source forming the local oscillator is a laser transmitting light at a frequency f.sub.LO, which is located outside the range between the cut-off frequencies f.sub.L1 and f.sub.L2 and differs from a frequency value (f.sub.LM), located between the frequencies f.sub.L1 and f.sub.L2, by the intermediate frequency (F.sub.ZF).
摘要翻译：本发明涉及一种具有外差接收的光时域反射计（OTDR），用于通过测量发送到测量波导中的光脉冲的反向散射部分来确定光波导（测量波导）的注意度。该结构包括将发送光束发送到测量波导中的调制激光光源和构成本地振荡器的激光光源，并且传播连续光，其中波长与中间频率不同的波长的光从背散射来自透射光源的光被叠加并施加到具有中频电输出信号的光电检测器，该中频电输出信号被滤波和评估。为了提高信噪比，传输光源是发光激光器1，其光在连续的时间间隔（t1至t2）内受到影响，使得光频率在两个截止频率fL1和fL2之间变化并且形成本地振荡器的光源是以位于截止频率fL1和fL2之间的范围之外的频率fLO的激光发射光，并且不同于频率fL1和fL1之间的频率值（fLM） fL2，通过中频（FZF）。

2. 发明授权

US4708471A Optical time-domain reflectometer using heterodyne reception 失效
标题翻译：光学时域反射计使用外差接收
公开(公告)号：US4708471A
公开(公告)日：1987-11-24
申请号：US832289
申请日：1986-02-21
申请人： Friedrich-Karl Beckmann , Wolfgang Hoppe , Reinhard Knochel
发明人： Friedrich-Karl Beckmann , Wolfgang Hoppe , Reinhard Knochel
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00 , G02F2/00 , G02F2/02 , G01N21/84 , G01N21/88
CPC分类号： G01M11/3172
摘要： The invention relates to an optical time-domain reflectometer (OTDR) using heterodyne reception for determining the attenuation of an optical fiber guide by measuring the backscattered portion of light pulses launched into the fiber. The reflectometer comprises a light source whose light is split into a local-oscillator beam and a measuring beam. The measuring beam is pulsed by an acousto-optical modulator (AOM) and is then launched into the optical fiber to be tested. The measuring beam thus has a frequency which is offset from the optical frequency by an acoustic frequency. The local-oscillator beam and the back-scattered portion of the measuring beam are both directed to an optical receiver producing an electric output signal. A component of the output signal has a frequency corresponding to the acoustic frequency. The time-dependent amplitude of this component is a measure of the length-dependent attenuation of the optical fiber. In order to reduce the losses in the path between the light source and the optical receiver via the fiber to be tested, the acousto-optical modulator (AOM) also functions as an optical deflection element.
摘要翻译：本发明涉及使用外差接收的光时域反射计（OTDR），其通过测量发射到光纤中的光脉冲的反向散射部分来确定光纤引导件的衰减。反射计包括光源，其光被分成局部振荡器光束和测量光束。测量光束由声光调制器（AOM）脉冲，然后发射到待测光纤中。因此，测量光束具有通过声学频率偏离光学频率的频率。测量光束的本地振荡器光束和后向散射部分都被引导到产生电输出信号的光接收机。输出信号的分量具有对应于声频的频率。该分量的时间依赖幅度是光纤长度依赖衰减的量度。为了通过要测试的光纤减少光源和光接收器之间的路径损耗，声光调制器（AOM）也用作光偏转元件。

3. 发明授权

US5082368A Heterodyne optical time domain reflectometer 失效
标题翻译：异位光学时域反射仪
公开(公告)号：US5082368A
公开(公告)日：1992-01-21
申请号：US599253
申请日：1990-10-03
申请人： Manfred H. Fuchs , Wolfgang Hoppe , Friedrich-Karl Beckmann , Ernst Brinkmeyer , Wolfgang Brennecke
发明人： Manfred H. Fuchs , Wolfgang Hoppe , Friedrich-Karl Beckmann , Ernst Brinkmeyer , Wolfgang Brennecke
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00 , G02F1/335
CPC分类号： G01M11/3109
摘要： Heterodyne optical time domain reflectometer (OTDR) for determining the attenuation behavior of a monomode waveguide (test waveguide) by measurement of the backscattered parts of light pulses transmitted in said waveguide. An acousto-optic modulator (AOM) which deflects the transmission beam from a laser into the waveguide to be tested at a light frequency which is modulated with the acoustic frequency when the AOM is acoustically energized in a pulse mode. The light pulses backscattered from the test waveguide are superimposed on a local oscillator beam (LO) constituted by the laser beam which traverses the AOM when the AOM is not energized. The optical system losses are reduced in that the superposition is realized in a passive coupler, particularly a fibre coupler (10, 26).
摘要翻译：用于通过测量在所述波导中传输的光脉冲的反向散射部分来确定单模波导（测试波导）的衰减特性的外差光学时域反射计（OTDR）。一种声光调制器（AOM），其将传输光束从激光偏转到待测试的波导中，该光频在AOM以脉冲模式被声学激励时用声频调制。从测试波导反向散射的光脉冲叠加在由AOM未通电时穿过AOM的激光束构成的本地振荡器束（LO）上。降低光学系统损耗，因为在无源耦合器，特别是光纤耦合器（10,26）中实现叠加。

4. 发明授权

US06813512B2 Method and apparatus for intravascular localization and imaging without X-rays 失效
标题翻译：无X射线的血管内定位和成像的方法和装置
公开(公告)号：US06813512B2
公开(公告)日：2004-11-02
申请号：US09976328
申请日：2001-10-12
申请人： Bernd Aldefeld , Friedrich-Karl Beckmann , Holger Eggers , Rolf Udo Dieter Kobs , Erhard Paul Artur Klotz , Michael Harald Kuhn , Dirk Manke , Volker Rasche , Georg Weidinger
发明人： Bernd Aldefeld , Friedrich-Karl Beckmann , Holger Eggers , Rolf Udo Dieter Kobs , Erhard Paul Artur Klotz , Michael Harald Kuhn , Dirk Manke , Volker Rasche , Georg Weidinger
IPC分类号： A61B500
CPC分类号： A61B5/065 , A61B5/055 , A61B5/06 , A61B34/20 , A61B90/361 , A61B90/37 , A61B2017/00243 , A61B2034/2051 , A61B2034/2063 , A61B2090/374 , A61B2090/3782 , A61B2090/3958
摘要： A device for determining the position of a medical instrument that is introduced into an object to be examined is also used for imaging the vicinity of the medical instrument. In order to enable the acquisition of instantaneous position information and image information from the vicinity of the medical instrument for all kinds of medical instruments, a localization device that is arranged in the end zone of the medical instrument that is to be introduced determines the position of the medical instrument within the object to be examined; at the same time image information is acquired in the vicinity of the medical instrument by an image acquisition device that is arranged on the medical instrument and on the basis of the position thus determined the position of the medical instrument (3) is reproduced in a survey image of the object to be examined and images of the vicinity of the object to be examined are displayed on the basis of the image information acquired.
摘要翻译：用于确定被引入待检查物体的医疗器具的位置的装置也用于对医疗器械附近进行成像。为了能够从用于各种医疗器械的医疗器械附近获取瞬时位置信息和图像信息，布置在待引入的医疗器械的端部区域中的定位装置决定了待检对象内的医疗器械; 同时通过布置在医疗器械上的图像获取装置在医疗器械附近获取图像信息，并且基于如此确定的位置，在调查中再现医疗器械（3）的位置基于所获取的图像信息，显示要被检查的对象的图像和被检查对象的附近的图像。

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