公开(公告)号：US06426679B1

公开(公告)日：2002-07-30

申请号：US09737723

申请日：2000-12-14

申请人： Tod A. Oblak ,  Harvey C. Nathanson

发明人： Tod A. Oblak ,  Harvey C. Nathanson

IPC分类号： H01S313

CPC分类号： H03L7/26 ,  G04F5/14 ,  H01S1/06 ,  H03L7/1974

摘要： An atomic clock of the type having a cell filled with an active vapor through which is projected a light beam. A detector of the projected light provides corresponding detector signals to a microprocessor. An rf frequency synthesizer provides a microwave signal to a microwave cavity adjacent the cell and also provides a clock standard output signal. The rf frequency synthesizer includes a fractional-N frequency synthesizer which compares signals from a voltage controlled crystal reference oscillator and a voltage controlled oscillator. The fractional-N frequency synthesizer is operable to provide an output control signal to precisely lock the voltage controlled oscillator microwave output signal with the voltage controlled crystal reference oscillator signal. The fractional-N frequency synthesizer also periodically causes a predetermined desired dither in the microwave signal.

摘要翻译： 具有填充有活性蒸汽的单体的类型的原子钟，通过该活性蒸气投射光束。 投影光的检测器向微处理器提供相应的检测器信号。 RF频率合成器向邻近单元的微波腔提供微波信号，并提供时钟标准输出信号。 RF频率合成器包括一个分数N频率合成器，其对来自压控晶体参考振荡器和压控振荡器的信号进行比较。 分数N频率合成器可操作以提供输出控制信号，以用压控晶体参考振荡器信号精确地锁定压控振荡器微波输出信号。 分数N频率合成器还周期性地在微波信号中引起预定的期望抖动。

公开(公告)号：US5946095A

公开(公告)日：1999-08-31

申请号：US812281

申请日：1997-03-06

申请人： Tom Henningsen ,  Tod A. Oblak ,  Max Garbuny ,  John M. Zomp ,  L. L. (Tom) Altpeter, Jr.

发明人： Tom Henningsen ,  Tod A. Oblak ,  Max Garbuny ,  John M. Zomp ,  L. L. (Tom) Altpeter, Jr.

IPC分类号： G01M3/22 ,  G01N21/35 ,  G01B9/02

CPC分类号： G01M3/22 ,  G01N21/3504 ,  G01N21/359

摘要： A natural gas detection system is provided for use with a vehicle. A natural gas detector apparatus is mounted to the vehicle so that the vehicle transports the detector apparatus over an are of interest at speeds of up to 20 miles per hour. The detector apparatus includes a transmitter section and a receiver section displaced a preselected distance from each other. The transmitter section has a light source transmitting a light beam to the receiver section forming a beam path therebetween. The apparatus is arranged such that natural gas intercepts the beam path and absorbs representative wavelengths of the light beam. The receiver section receives a portion of the light beam onto an electro-optical etalon for detecting the gas. A method of detecting natural gas is also provided. The method has the steps of providing a vehicle and mounting a natural gas detector apparatus to the vehicle. The detector apparatus has a transmitter section and a receiver section displaced a preselected distance from each other. The transmitter section includes a light source. The method includes transmitting a light beam in a beam path from the transmitter section to the receiver section, and driving the vehicle over an area of interest so that natural gas intercepts the beam path and absorbs representative wavelengths of the light beam. Fhe method also includes receiving a portion of the light beam in the receiver section so that the light beam is directed into an etalon, and detecting a gas leak in the area of interest from the portion light beam using the gas detection apparatus mounted on the vehicle while the vehicle is in motion.

摘要翻译： 提供了一种与车辆一起使用的天然气检测系统。 将天然气检测器装置安装到车辆上，使得车辆以高达每小时20英里的速度将检测器装置感兴趣。 检测器装置包括发射器部分和接收器部分，其相互之间的预选距离偏移。 发射机部分具有将光束发射到接收器部分的光源，其在它们之间形成光束路径。 该装置被布置成使得天然气拦截光束路径并吸收光束的代表性波长。 接收器部分将光束的一部分接收到用于检测气体的电光标准具上。 还提供了一种天然气检测方法。 该方法具有提供车辆并将天然气检测器装置安装到车辆的步骤。 检测器装置具有发送器部分和接收器部分，该接收器部分彼此相距预定的距离。 发射机部分包括光源。 该方法包括将光束从发射器部分传输到接收器部分，并且将车辆驱动在感兴趣区域上，使得天然气拦截光束路径并吸收光束的代表性波长。 Fhe方法还包括在接收器部分中接收光束的一部分，使得光束被引导到标准具中，并且使用安装在车辆上的气体检测装置从部分光束检测感兴趣区域中的气体泄漏 而车辆在运动。

公开(公告)号：US5768323A

公开(公告)日：1998-06-16

申请号：US322854

申请日：1994-10-13

申请人： Brian W. Kroeger ,  Joseph B. Bronder ,  Tod A. Oblak ,  Jeffrey S. Baird

发明人： Brian W. Kroeger ,  Joseph B. Bronder ,  Tod A. Oblak ,  Jeffrey S. Baird

IPC分类号： H03L7/099 ,  H04L7/00 ,  H04L7/02 ,  H04L27/227

CPC分类号： H04L27/2273 ,  H03L7/0994 ,  H04L7/0029 ,  H04L7/0083

摘要： A method and apparatus for synchronizing symbol timing for a QPSK demodulator. A matched filter pair outputs respective "early-punctual-late" signals. The early and late signals are input to a symbol synchronizing estimator that produces an interpolation control signal used by the filters to synchronize the symbol timing to the sample timing. The punctual signal is output as an information bearing signal representing the received inphase and quadrature signals. The matched filters are interpolating matched filters. The symbol synchronizing estimator normalizes the early and late signals in a manner that allow the demodulator to "flywheel" over signals having a low signal to noise ratio below a predetermined threshold.

摘要翻译： 一种用于使QPSK解调器的符号定时同步的方法和装置。 匹配滤波器对输出相应的“早点延迟”信号。 早期和晚期信号被输入到符号同步估计器，该估计器产生滤波器使用的插值控制信号，以使符号定时与采样定时同步。 作为表示接收的同相和正交信号的信息承载信号输出准时信号。 匹配滤波器内插匹配滤波器。 符号同步估计器以使得解调器能够以低于预定阈值的低信噪比的信号“飞轮”的方式对早期和晚期信号进行归一化。

公开(公告)号：US5319972A

公开(公告)日：1994-06-14

申请号：US963892

申请日：1992-10-19

申请人： Tod A. Oblak ,  Daniel F. Dudek ,  John R. Smith

发明人： Tod A. Oblak ,  Daniel F. Dudek ,  John R. Smith

IPC分类号： G01F23/296 ,  G01S7/52 ,  G01S7/527 ,  G21C17/035 ,  G01F23/00

CPC分类号： G21C17/035 ,  G01F23/2962 ,  G01S7/52004 ,  G01S7/527 ,  G21Y2002/204 ,  G21Y2002/206 ,  G21Y2004/30

摘要： An ultrasonic level measuring system includes a transducer mounted on the bottom of a pipe which launches acoustic pulses up through the pipe wall into the water. The pulses are reflected from the water surface and received by the transducer along with pulses reflected by the pipe wall and reverberations within the pipe wall. The system has a monitor mode in which a variable threshold for the reflected pulses is set by dividing the time after a trigger pulse into time bins and automatically establishing a threshold level for each time bin. In a signal search mode, the time bin containing the liquid level is identified from a histogram recording reflected pulses which exceed the threshold levels for the various time bins. In a normal operating mode, foreground calculations precisely calculating the liquid level in the identified bin alternate with background calculations which reassess the identification of the time bin containing the liquid level. If the bin identified by the background calculation does not agree with the time bin being used by the foreground calculation, the system restarts by returning to the signal search mode. Various system parameters can be easily changed without the need to rewrite code.

摘要翻译： 超声波液位测量系统包括安装在管道底部的换能器，其将通过管壁的声脉冲发射到水中。 脉冲从水面反射并被传感器接收，同时伴随管壁反射的脉冲和管壁内的混响。 系统具有监视模式，其中通过将触发脉冲之后的时间除以时间段来设置反射脉冲的可变阈值，并自动建立每个时间段的阈值水平。 在信号搜索模式中，从记录反应脉冲的直方图识别包含液面的时间段，该反射脉冲超过各种时间段的阈值水平。 在正常操作模式下，精确计算所识别的液位中的液位的前景计算与背景计算交替，其中重新评估包含液位的时间段的识别。 如果通过后台计算识别的bin与前台计算所使用的时间段不一致，则系统通过返回信号搜索模式重新启动。 可以轻松更改各种系统参数，无需重写代码。

公开(公告)号：US5005142A

公开(公告)日：1991-04-02

申请号：US386008

申请日：1989-07-24

申请人： John B. Lipchak ,  Tod A. Oblak ,  Fred H. Bednar ,  William Ciaramitaro ,  Francis R. Hughes ,  John R. Smith ,  Gregory A. Gisoni

发明人： John B. Lipchak ,  Tod A. Oblak ,  Fred H. Bednar ,  William Ciaramitaro ,  Francis R. Hughes ,  John R. Smith ,  Gregory A. Gisoni

IPC分类号： G06F11/07 ,  G06F17/40

CPC分类号： G06F11/0709 ,  G06F11/0736 ,  G06F11/0751

摘要： The present invention is a component monitoring system which includes all sensor and plant component monitoring at distributed plant locations close to the sensors which are the source of the signals to be analyzed. Minimally preconditioned analog sensor signals are multiplexed and further conditioned by a sensor signal preprocessor that adjusts the gain and filters the sensor signals before being applied to an analog-to-digital converter controlled by a data acquisition computer. The analog sensor signals are converted into digital samples and stored in a data memory of a digital signal processor using a direct memory access technique. The data acquisition computer also controls the selection of sensors, gain, etc., based on commands from a controller. The digital signal processor, once sufficient sensor data has been collected, performs appropriate processing using known digital signal processing techniques. This processed data is then sent to the controller for analysis to determine plant component condition. The analysis and processing routines can be changed by downloading a new routine from the controller. Once a sensor signal is processed, the controller selects the next sensor by transmitting an appropriate command to the data acquisition computer.

摘要翻译： 本发明是一种组件监控系统，其包括在靠近传感器的分布式工厂位置处的所有传感器和设备部件监控，传感器是要分析的信号源。 微型预处理的模拟传感器信号被多路复用，并由传感器信号预处理器进一步调节，传感器信号预处理器在被应用于由数据采集计算机控制的模数转换器之前调节增益并对传感器信号进行滤波。 模拟传感器信号被转换成数字样本，并使用直接存储器访问技术存储在数字信号处理器的数据存储器中。 数据采集​​计算机还根据控制器的命令控制传感器，增益等的选择。 一旦已经收集足够的传感器数据，数字信号处理器就使用已知的数字信号处理技术进行适当的处​​理。 然后将该处理的数据发送到控制器进行分析以确定工厂组件状况。 可以通过从控制器下载新的例程来更改分析和处理程序。 一旦处理了传感器信号，控制器通过向数据采集计算机发送适当的命令来选择下一个传感器。