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    • 8. 发明授权
    • Photoreceiver assembly for high-powered lasers
    • US06649900B2
    • 2003-11-18
    • US09949222
    • 2001-09-07
    • Robert FilkinsThomas E. Drake
    • Robert FilkinsThomas E. Drake
    • H04B10158
    • H03F3/08H03F2200/534H03F2200/537
    • A photoreceiver assembly for accurately separating at least one low level, high frequency signal carried from a large, low frequency pulse. Illustratively, in one exemplary embodiment, the photoreceiver assembly extracts a high frequency ultrasonic signal from the optical frequency of light by shining that ultrasonic base band signal onto a photodetector for conversion into an electrical signal in the bandwidth of interest. The photoreceiver assembly includes a photodetector and a splitter coupled to the photodetector. The splitter is also coupled to a plurality of transimpedance signal paths. In operation, the splitter receives a current from the photodetector, separates, and directs the current to the plurality of transimpedance signal paths. In one exemplarily embodiment, the photoreceiver further includes a transimpedance amplifier assembly coupled to at least one path of the transimpedance signal paths. The transimpedance amplifier assembly converts the high frequency component of the current into a signal voltage, such as for example a signal voltage defining an ultrasonic signal. Furthermore, the transimpedance amplifier assembly includes a forward path gain arrangement for accommodating the electrical configuration of the splitter.
    • 10. 发明申请
    • Method to characterize material using mathematical propagation models and ultrasonic signal
    • 使用数学传播模型和超声波信号来表征材料的方法
    • US20050102109A1
    • 2005-05-12
    • US10975560
    • 2004-10-28
    • Marc DuboisPeter LorraineRobert Filkins
    • Marc DuboisPeter LorraineRobert Filkins
    • G01N29/24G01N29/44G01N29/48G01B5/28
    • G01N29/48G01N29/0645G01N29/2418G01N29/4418
    • The invention is directed to a system and method for detecting defects in a manufactured object. These defects may include flaws, delaminations, voids, fractures, fissures, or cracks, among others. The system utilizes an ultrasound measurement system, a signal analyzer and an expected result. The signal analyzer compares the signal from the measurement system to the expected result. The analysis may detect a defect or measure an attribute of the manufactured object. Further, the analysis may be displayed or represented. In addition, the expected result may be generated from a model such as a wave propagation model. One embodiment of the invention is a laser ultrasound detection system in which a laser is used to generate an ultrasonic signal. The signal analyzer compares the measured ultrasonic signal to an expected result. This expected result is generated from a wave propagation model. The analysis is then displayed on a monitor.
    • 本发明涉及一种用于检测制造对象中的缺陷的系统和方法。 这些缺陷可能包括缺陷,分层,空隙,裂缝,裂缝或裂纹等。 该系统利用超声测量系统,信号分析仪和预期结果。 信号分析仪将来自测量系统的信号与预期结果进行比较。 分析可以检测缺陷或测量所制造的对象的属性。 此外,可以显示或表示分析。 此外,可以从诸如波传播模型的模型生成预期结果。 本发明的一个实施例是激光超声波检测系统,其中使用激光来产生超声波信号。 信号分析仪将测量的超声信号与预期结果进行比较。 该预期结果是从波传播模型产生的。 然后将分析显示在监视器上。