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21. 发明授权

US5345522A Reduced noise fiber optic towed array and method of using same 失效
标题翻译：减少噪音的光纤拖曳阵列及其使用方法
公开(公告)号：US5345522A
公开(公告)日：1994-09-06
申请号：US939237
申请日：1992-09-02
申请人： Victor Vali , David B. Chang , I-Fu Shih
发明人： Victor Vali , David B. Chang , I-Fu Shih
IPC分类号： G01D5/353 , G01H9/00 , G01V1/20 , G02B6/28 , G01B9/02 , G01V1/38 , H01J5/16
CPC分类号： G01H9/004 , G01D5/35383 , G01V1/201
摘要： A sensitive towed optical fiber sensor array 50, wherein the fiber sensors (60A-60N) are connected in parallel, and the optical fiber cable (34) is paid out from the towing ship at a velocity about equal to but opposite to the velocity of the towing ship. The fiber sensors (60A-60N) are immune to electromagnetic interference, and the output of the sensors can be isolated readily to the parallel hookup of the sensors. Turbulence and acceleration noise is greatly reduced due to the manner in which the fiber cable (34) is paid out, and crosstalk between sensors is eliminated.
摘要翻译：一种敏感的牵引光纤传感器阵列50，其中光纤传感器（60A-60N）并联连接，光缆（34）以大约等于但与牵引船。光纤传感器（60A-60N）不受电磁干扰的影响，传感器的输出可以很容易地与传感器的并联连接。由于支付光缆（34）的方式，湍流和加速噪声大大降低，并且消除了传感器之间的串扰。

22. 发明授权

US5118932A Shaft rotation rate sensor with a diffraction grating producing a velocity-related beat frequency 失效
$Shaft rotation rate sensor with a diffraction grating producing a velocity-related beat frequency$
标题翻译：具有衍射光栅的轴转速传感器产生速度相关拍频
公开(公告)号：US5118932A
公开(公告)日：1992-06-02
申请号：US611598
申请日：1990-11-13
申请人： Patrick C. Brownrigg , Victor Vali , David B. Chang
发明人： Patrick C. Brownrigg , Victor Vali , David B. Chang
IPC分类号： G01D5/36 , G01D5/38 , G01P3/36 , G01P3/486 , G02B5/18
CPC分类号： G01P3/486 , G01D5/38 , G02B5/1861
摘要： A shaft rotation rate sensor for turbine engines. A reflective radial grating on the surface of the turbine shaft is employed in conjunction with an electromagnetic wave source and beam combining elements to mix two beams of frequency f and f.+-..DELTA.f, where .DELTA.f is proportional to the rotation rate of the grating. The source energy is reflected off the grating, and the zero-th and first order transmission from the grating are mixed to give the beat frequency proportional to the rotation rate. The sensor has no moving parts.

23. 发明授权

US5100230A True ground speed sensor 失效
标题翻译：真正的地面速度传感器
公开(公告)号：US5100230A
公开(公告)日：1992-03-31
申请号：US597953
申请日：1990-10-12
申请人： Patrick C. Brownrigg , David B. Chang , Victor Vali
发明人： Patrick C. Brownrigg , David B. Chang , Victor Vali
IPC分类号： G01S7/48 , G01P3/36 , G01S17/58 , G01S17/88
CPC分类号： G01P3/366
摘要： A speed sensor for a moving vehicle. A transmissive grating is used in conjunction with an electromagnetic wave source and beam combining waveguide to mix two beams of frequency f and f+.DELTA.f, where .DELTA.f is proportional to the speed of the grating relative to the ground. The source energy is reflected off the road to the grating. The zeroth and first order transmission from the grating are mixed to give the beat frequency .DELTA.f proportional to the ground speed. The sensor has no moving parts, and is independent of any gear ratios.

24. 发明授权

US5058420A Fiber optic liquid leak detector 失效
标题翻译：光纤液体探测器
公开(公告)号：US5058420A
公开(公告)日：1991-10-22
申请号：US511618
申请日：1990-04-20
申请人： Victor Vali , David B. Chang , Patrick C. Brownrigg
发明人： Victor Vali , David B. Chang , Patrick C. Brownrigg
IPC分类号： G01F23/28 , G01M3/32 , G01M3/38
CPC分类号： G01M3/3245
摘要： A precision liquid leak detector 10 free of mechanical moving parts is disclosed herein. The liquid leak detector 10 of the present invention is disposed to measure the rate of change of the volume of a liquid within a container 14. The leak detector 10 includes a light guide 16, implemented as an optical fiber, which is disposed within the container 14 and at least partially immersed in the liquid. The optical fiber 16 includes a fiber core circumscribed by a fiber cladding selected such that evanescent wave loss occurs as a result of immersion of the cladding within the liquid. The optical fiber 16 is positioned in optical alignment with a laser source 26, which injects optical energy therein. The leak detector 10 of the present invention further includes an arrangement 24 for measuring the decrease in the intensity of the injected optical energy occurring over a length of the fiber 16 immersed in the liquid. The measuring arrangement 24 then generates an intensity loss signal indicative of this intensity decrease. The inventive leak detector 10 also includes a network 36 and 38 for measuring the rate of change of the intensity loss signal and for calculating the rate of change of the liquid volume on the basis of the change in the intesity loss signal.

25. 发明申请

US20110166438A1 RF FIELD SHAPING AND ATTENUATION FOR EMAI INDUCTION ELEMENTS 审中-公开
标题翻译： EMAI感应元件的射频场形成和衰减
公开(公告)号：US20110166438A1
公开(公告)日：2011-07-07
申请号：US12896733
申请日：2010-10-01
申请人： Jane F. Emerson , David B. Chang , Stephen A. Cerwin , James E. Drummond , Joy Drummond
发明人： Jane F. Emerson , David B. Chang , Stephen A. Cerwin , James E. Drummond , Joy Drummond
IPC分类号： A61B8/13 , A61B8/00 , A61B5/055
CPC分类号： A61B5/0051 , G01R33/4814
摘要： An Electro-Magnetic Imaging (EMAI) System is presented. EMAI systems can include induction elements (e.g., an induction coil) configured to induce a target tissue to generate internally sourced ultrasounds. The induction elements can be shielded by one or more shielding elements to shape, or otherwise alter, an imaging field while attenuating radiated fields in a far zone. EMAI systems can further include a shield tuner to adjust shield parameters to achieved desired imaging or radiated field properties. A shielding element can be placed approximately one induction coil radius away from the coil to achieve suitably strong imaging field magnitudes while also achieving suitably weak radiated field magnitudes in a far zone. In some embodiments, acoustic sensors lack substantial shielding from the fields generated by the induction elements.
摘要翻译：介绍了电磁成像（EMAI）系统。 EMAI系统可以包括被配置为诱导靶组织以产生内部来源的超声波的感应元件（例如感应线圈）。感应元件可以被一个或多个屏蔽元件屏蔽，以形成或以其它方式改变成像场，同时衰减远区中的辐射场。 EMAI系统还可以包括屏蔽调谐器来调节屏蔽参数以实现期望的成像或辐射场特性。屏蔽元件可以放置在大约一个感应线圈半径远离线圈，以实现适当强的成像磁场强度，同时在远区域也实现适当的弱辐射场强。在一些实施例中，声传感器缺少与感应元件产生的场的实质屏蔽。

26. 发明授权

US06463202B1 Optimization of curved waveguide design to reduce transmission losses 有权
标题翻译：弯曲波导设计优化，减少传输损耗
公开(公告)号：US06463202B1
公开(公告)日：2002-10-08
申请号：US09591084
申请日：2000-06-09
申请人： Stephen A. Cerwin , David B. Chang
发明人： Stephen A. Cerwin , David B. Chang
IPC分类号： G02B610
CPC分类号： G02B6/125 , G02B6/02 , G02B2006/12119
摘要： A waveguide designed to minimize bend-induced losses. The waveguide has three regions of varying indices of refraction. The indices of refraction are chosen so that the field is a trigonometric function in the core region, evanescent in the intermediate region, and trigonometric again in the outer region. The widths of each region are calculated to further reduce losses.
摘要翻译：设计用于最小化弯曲损耗的波导。波导具有不同折射率的三个区域。选择折射率使得该场是核心区域中的三角函数，在中间区域中消逝，并且再次在外部区域中进行三角函数。计算每个区域的宽度以进一步减少损失。

27. 发明授权

US5228856A Optics approach to low side compliance simulation 失效
标题翻译：低边合规模拟的光学方法
公开(公告)号：US5228856A
公开(公告)日：1993-07-20
申请号：US653530
申请日：1991-02-11
申请人： David B. Chang , I-Fu Shih
发明人： David B. Chang , I-Fu Shih
IPC分类号： G09B9/32 , H04N13/00
CPC分类号： H04N13/026 , G09B9/326 , H04N13/0003 , H04N13/04 , H04N2013/0081
摘要： A low cost visual simulation system (100) for training simulators is disclosed. Aerial photo transparencies are used directly as image sources without creating a digital data base. The approximately correct image perspective is generated optically by a deformable mirror (114) and a zoom lens and rotation prism assembly (106). Stereo image photo pairs (120) need to be analyzed only at a relatively small number of points; thus, the computational burden is greatly reduced.

28. 发明授权

US5165084A System and method for measuring changes in sea level 失效
标题翻译：测量海平面变化的系统和方法
公开(公告)号：US5165084A
公开(公告)日：1992-11-17
申请号：US659761
申请日：1991-02-25
申请人： David B. Chang
发明人： David B. Chang
IPC分类号： G01C13/00 , G01F23/26
CPC分类号： G01F23/263 , G01C13/008
摘要： A system for determining changes in sea level based on the measurement of distance between capacitive elements. The system includes an electrically conductive sphere 17, 117 mounted on an electrically non-conductive buoy 13, 113, positioned a predetermined distance above sea level with the sphere and the sea (earth) acting as capacitive elements separated by the predetermined distance. The system also includes an ion source 25 for imparting charge to the sphere 17, a clock 23, an electrometer 21 for detecting (measuring) the voltage on the sphere at selected clock times. In an alternative embodiment, the ion source and electrometer are replaced with a swept frequency voltage generator 121, an inductor 127, and an ammeter 125. The inductor 127 and the sphere 117 form an LC component. In response to voltages of various frequencies applied to the sphere 117 by the generator 121, the ammeter 125 at each clock time, detects (measures) the current at the resonant frequency of the LC component. The measured voltages (or currents) are then averaged over time to compensate for wave motion (bobbing) of the buoy and dimensional changes in the buoy due to thermal (solar) effects. From each averaged voltage (or current) capacitance and sea level are calculated, and the change in sea level noted.
摘要翻译：一种用于基于电容元件之间的距离的测量来确定海平面变化的系统。该系统包括安装在非导电浮标13,113上的导电球体17,117，其位于海平面以上的预定距离处，球体和作为电容元件的海洋（地球）作为隔开预定距离的电容元件。该系统还包括用于向球体17施加电荷的离子源25，时钟23，用于在选定的时钟时间检测（测量）球体上的电压的静电计21。在替代实施例中，离子源和静电计被扫频频率电压发生器121，电感器127和电流计125代替。电感器127和球体117形成LC分量。响应于由发生器121施加到球体117的各种频率的电压，电流表125在每个时钟时间检测（测量）LC分量的谐振频率处的电流。然后测量的电压（或电流）随时间平均以补偿浮标的波浪运动（浮动）和由于热（太阳）效应引起的浮标中的尺寸变化。从每个平均电压（或电流）电容和海平面计算，并记录海平面的变化。

29. 发明授权

US5117676A Leak detector for natural gas pipelines 失效
标题翻译：天然气管道泄漏探测器
公开(公告)号：US5117676A
公开(公告)日：1992-06-02
申请号：US659670
申请日：1991-02-25
申请人： David B. Chang
发明人： David B. Chang
IPC分类号： G01M3/24
CPC分类号： G01M3/243
摘要： A simple acoustic detection system is described for measuring leaks from long gas pipelines. Microphones are strung along (and attached to) the pipeline exterior. The outputs of the microphones are spectrally analyzed. A peak at a frequency f.congruent.V.sub.s /(2d) and its harmonics indicates a leak in the vicinity of the recording microphone, where V.sub.s is the velocity of sound in the gas and d is the thickness of the pipe wall.
摘要翻译：描述了一种简单的声学检测系统，用于测量长天然气管道的泄漏。麦克风沿着（并附着在）管道外部。对麦克风的输出进行光谱分析。频率为f SIMILAR /（2d）的峰值及其谐波表示记录麦克风附近的泄漏，其中Vs是气体中的声速，d是管壁的厚度。

30. 发明授权

US5003186A Stratospheric Welsbach seeding for reduction of global warming 失效
标题翻译：平流层维尔斯巴赫种植用于减少全球变暖
公开(公告)号：US5003186A
公开(公告)日：1991-03-26
申请号：US513145
申请日：1990-04-23
申请人： David B. Chang , I-Fu Shih
发明人： David B. Chang , I-Fu Shih
IPC分类号： A01G15/00
CPC分类号： A01G15/00
摘要： A method is described for reducing atmospheric or global warming resulting from the presence of heat-trapping gases in the atmosphere, i.e., from the greenhouse effect. Such gases are relatively transparent to sunshine, but absorb strongly the long-wavelength infrared radiation released by the earth. The method incudes the step of seeding the layer of heat-trapping gases in the atmosphere with particles of materials characterized by wavelength-dependent emissivity. Such materials include Welsbach materials and the oxides of metals which have high emissivity (and thus low reflectivities) in the visible and 8-12 micron infrared wavelength regions.
摘要翻译：描述了一种用于减少由于大气中的热捕获气体的存在而引起的大气或全球变暖的方法，即温室效应。这种气体对阳光相对透明，但是强烈地吸收了地球释放的长波长的红外辐射。该方法包括以大小依次为波长依赖的发射率的材料颗粒将大气中的热捕获气体层接种的步骤。这些材料包括威尔斯巴赫材料和在可见光和8-12微米红外波长区域具有高发射率（因而具有低反射率）的金属氧化物。

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