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1. 发明授权

US4447151A Method and apparatus for fast laser pulse detection using gaseous plasmas 失效
标题翻译：使用气体等离子体进行快速激光脉冲检测的方法和装置
公开(公告)号：US4447151A
公开(公告)日：1984-05-08
申请号：US274917
申请日：1981-06-18
申请人： Edward J. McLellan , John A. Webb
发明人： Edward J. McLellan , John A. Webb
IPC分类号： G01J1/42 , H01S3/00 , H01J40/00
CPC分类号： H01S3/0014 , G01J1/4257
摘要： The method and device of the instant invention is a detector of pulsed laser radiation which utilizes the electromotive force generated by the plasma formed when such radiation is focused onto a surface (1). Measurements are made with a 10.6 .mu.m CO.sub.2 laser capable of producing peak intensities of 10.sup.13 W/cm.sup.2 when directed through a converging lens (2). Evacuated detector response to such laser intensity is 1 kV signal peak amplitude and subnanosecond risetimes into a 50.OMEGA. load (3). Detector performance is found to be greatly altered with the introduction of a background gas (4). For example, with one atmosphere of air, the detector produces prompt signals of the order of 1 V with subnanosecond response for pulse trains lasting 100 ns. With argon, krypton, or zenon at pressures of the order of 10 torr, the detector generates "trigger pulses" of about 250 V amplitude and 0.2 ns risetimes. Such detectors are quite robust when irradiated with high intensity laser radiation and are useful for qualitative laser beam monitoring.
摘要翻译：本发明的方法和装置是脉冲激光辐射的检测器，其利用当这种辐射聚焦到表面（1）上时形成的等离子体产生的电动势。使用10.6微米CO2激光器进行测量，其能够通过会聚透镜（2）产生1013W / cm2的峰值强度。抽真空的检测器对这种激光强度的响应是1 kV信号峰值振幅，亚纳秒钟进入50欧姆负载（3）。随着背景气体的引入，发现检测器性能大大改变（4）。例如，在空气浓度为一个的情况下，检测器会产生1V的等级信号，并且持续100ns的脉冲串具有亚纳秒响应。在大约10托的压力下使用氩气，氪气或者氙气，检测器产生约250 V振幅和0.2 ns时间的“触发脉冲”。当用高强度激光辐射照射时，这种检测器是相当鲁棒的，并且可用于定性激光束监测。

2. 发明授权

US4345201A Fault location system with enhanced noise immunity 失效
标题翻译：故障定位系统具有增强的抗噪声能力
公开(公告)号：US4345201A
公开(公告)日：1982-08-17
申请号：US161484
申请日：1980-06-20
申请人： Brett A. Thompson , John A. Webb , Martin B. White
发明人： Brett A. Thompson , John A. Webb , Martin B. White
IPC分类号： G01R31/08 , G01R31/28 , G01R31/315
CPC分类号： G01R31/088 , G01R31/28 , G01R31/2806 , G01R31/315
摘要： A probe for sensing the direction of flow of an injected current pulse along a conductor of a circuit under test. The probe is linked to automatic test equipment (ATE), and is triggered to inject the pulse during a test sequence at a step previously found by the ATE to establish a faulty state in the circuit so that the faulty one of several components connected to a circuit node can be identified. The probe injects an approximately triangular-waveform current pulse which has a steep rising edge and a less steep falling edge, thereby inducing a voltage level and thus permits discrimination of the direction of current flow. To detect low level current pulses in the presence of masking noise, the output of the probe is connected to the series combination of a filter, an integrator and an A/D converter. The circuit under test is set to its faulty state, and then the probe is repeatedly operated, first with the injection of the current pulses inhibited and then with current pulses being injected. An average noise level is calculated, and then compared with the average signal level obtained while pulses are being injected to determine the direction of flow of the injected current pulses.
摘要翻译：用于感测沿着被测电路的导体的注入电流脉冲的流动方向的探头。探头连接到自动测试设备（ATE），并且被触发以在ATE先前发现的步骤期间在测试序列期间注入脉冲，以在电路中建立故障状态，使得几个组件中的有缺陷的一个连接到电路节点可以被识别。探头注入近似三角波形的电流脉冲，其具有陡峭的上升沿和较不陡峭的下降沿，从而引起电压电平，从而允许区分电流方向。为了在存在掩蔽噪声的情况下检测低电平电流脉冲，探头的输出连接到滤波器，积分器和A / D转换器的串联组合。被测电路设置为故障状态，然后重复操作探头，首先注入电流脉冲，然后注入电流脉冲。计算平均噪声电平，然后与注入脉冲时获得的平均信号电平进行比较，以确定注入电流脉冲的流向。

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