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    • 31. 发明授权
    • Fiber optic flow meter
    • 光纤流量计
    • US07004038B2
    • 2006-02-28
    • US10905419
    • 2005-01-03
    • John C. Tsai
    • John C. Tsai
    • G01F1/28
    • G01F1/28G01F1/661
    • A metering module, or a system employing such, for monitoring fluid flow with a laser light source, a light detector and a processor, wherein the fluid may be a gas or liquid. A valve section and a grating section including a fiber Bragg grating (FBG) are provided. The valve section applies strain on the FBG that is representative of the flow of the fluid. An optical fiber couples a probing laser signal to the FBG and the FBG reflects a portion back as a return laser signal that the optical fiber couples to the light detector for detection and processing.
    • 测量模块或采用这种方式的系统用于利用激光光源,光检测器和处理器监测流体流动,其中流体可以是气体或液体。 提供了一个阀部分和一个包括光纤布拉格光栅(FBG)的光栅部分。 阀门部分应用于代表流体流动的FBG上。 光纤将探测激光信号耦合到FBG,并且FBG将部分反射回作为光纤耦合到光检测器进行检测和处理的返回激光信号。
    • 33. 发明授权
    • Wavelength division multiplexing and de-multiplexing system
    • 波分复用和解复用系统
    • US06807339B1
    • 2004-10-19
    • US10007719
    • 2001-11-09
    • John C. TsaiDavid W. Wang
    • John C. TsaiDavid W. Wang
    • G02B634
    • B82Y20/00G02B5/1857G02B6/124G02B2006/12038G02B2006/12061G02B2006/12078
    • A multiplexing and de-multiplexing system that may both use the same wavelength division multiplexing (WDM) device. For multiplexing, light sources provide a plurality of light beams having different wavelengths and the WDM forms a single light beam. For de-multiplexing, a light source provides a light beam having a plurality of different light wavelengths and the WDM forms a plurality of output light beams each having respective of the wavelengths. The WDM devices may particularly be formed from optically multi-dimensional planar gratings and cubical gratings which may diffract single wavelengths, sets of wavelengths, and ranges of wavelengths each with respect to one optical dimension present. The gratings may be discrete or integrated in the multiplexing or the de-multiplexing devices. Complex embodiments of the multiplexing system, such as an interleaver, and complex embodiments of the de-multiplexing system, such as a de-interleaver, can be formed using blocks of the gratings.
    • 可以使用相同的波分复用(WDM)设备的复用和解复用系统。 对于多路复用,光源提供具有不同波长的多个光束,并且WDM形成单个光束。 为了解复用,光源提供具有多个不同光波长的光束,并且WDM形成各自具有各自波长的多个输出光束。 WDM设备可以特别地由光学多维平面光栅和立方光栅形成,其可以相对于存在的一个光学维度衍射单个波长,波长组和波长范围。 光栅可以是离散的或集成在复用或解复用器件中。 诸如交织器的复用系统的复杂实施例和解复用系统的复杂实施例(诸如解交织器)可以使用光栅块形成。
    • 35. 发明授权
    • Positional measurement with normalized signal processing
    • 采用归一化信号处理进行位置测量
    • US06317200B1
    • 2001-11-13
    • US09548918
    • 2000-04-13
    • Mao WangJohn C. Tsai
    • Mao WangJohn C. Tsai
    • G01C308
    • G01S17/10G01D5/26G01S7/4811G01S7/4812
    • A measurement apparatus (10, 110) and methods to perform positional types of measurement with normalization respective to either or both of light beam (16, 116) intensity and measurement target (12, 112) reflectivity. A light source, such as a laser diode (14, 114), produces a light beam (16, 116) which is directed at the measurement target (12, 112). One or more beamsplitters (28, 120, 124) in the path of the light beam (16, 116) direct sample portions into one or more photodetectors (32, 36, 122, 128) to obtain either or both of illumination and reflectivity sample values. A portion of the light beam (16, 116) which is reflected by the measurement target (12, 112) is passed through and restricted by an aperture (26, 132) and then detected by a position sensitive detector (38, 134) to obtain a position value. The position value may then be normalized based on either or both of the illumination and reflectivity sample values.
    • 测量装置(10,110)以及对光束(16,116)强度和测量目标(12,112)之一或两者进行归一化的位置测量类型的测量装置(10,110)反射率。 诸如激光二极管(14,114)的光源产生指向测量目标(12,112)的光束(16,116)。 在光束(16,116)的路径中的一个或多个分束器(28,120,124)将样本部分引导到一个或多个光电检测器(32,36,122,128)中以获得照明和反射率样本中的任一个或两者 价值观。 由测量对象(12,112)反射的光束(16,116)的一部分被孔径(26,132)通过并被一个位置敏感检测器(38,134)检测到 获得位置值。 然后可以基于照明和反射率样本值中的一个或两者来归一化位置值。
    • 36. 发明授权
    • Apparatus and method for inscribing, optically detecting, and using a clock pattern to write a servo pattern in an information storage unit
    • 用于刻录,光学检测和使用时钟图案以将信息存储单元中的伺服图案写入的装置和方法
    • US06266298B1
    • 2001-07-24
    • US09084039
    • 1998-05-22
    • John C. Tsai
    • John C. Tsai
    • G11B1100
    • G11B20/1403G11B5/59633G11B27/24G11B2220/20
    • Apparatus (10) and method (100) for inscribing a clock pattern (14), detecting the clock pattern (14) optically, and using the clock pattern (14) to write a sevo pattern in an information storage unit (12), such as a computer hard drive. The clock pattern (14) is inscribed using a marking system (64), which may include a laser (66) or employ other, even non-optical, methods. The clock pattern (14) is inscribable into various locations on a disk platter (16) inside the storage unit (12), including many outside the media surface (26) conventionally used for such in data storage units. While the disk platter (16) is rotating, the clock pattern (14) is on detected using an detection subsystem (46), if desired through a transparent window (36) in a hermetically sealed housing (34) of the storage unit (12), for use in writing the servo pattern with less sector-inconsistency error and off-track error.
    • 用于刻录时钟图案(14),用于光学地检测时钟图案(14)的装置(10)和方法(100),以及使用时钟图案(14)将信息存储单元(12)中的写入图案写入 作为电脑硬盘。 使用标记系统(64)刻录时钟图案(14),其可以包括激光器(66)或采用其它甚至非光学方法。 时钟图案(14)可刻写在存储单元(12)内部的盘片(16)上的各种位置,包括在数据存储单元中常规使用的介质表面(26)外部的许多位置。 当盘片(16)旋转时,如果需要,通过存储单元(12)的密封壳体(34)中的透明窗口(36),使用检测子系统(46)来检测时钟图案(14) ),用于写入具有较少扇区不一致性错误和偏离磁道错误的伺服模式。
    • 37. 发明授权
    • Dual laser system for extended heterodyne interferometry
    • 双激光系统用于扩展外差干涉测量
    • US6052186A
    • 2000-04-18
    • US187434
    • 1998-11-05
    • John C. Tsai
    • John C. Tsai
    • G01B9/02
    • G01B9/02007G01B9/02003G01B9/02027G01B2290/70
    • The present invention is a laser system (10, 100, 200) employing paired simple lasers (12, 16) or paired Zeeman type lasers (102, 112 or 202, 204). Systems of beambenders (20, 108, 210, 212, 214), half-wave plates (106, 116), and polarizing beamsplitters (22, 104, 114, 118, 216) pair the frequency component of one laser (12, 16, 102, 112, 202, 204) with that of another to produce one or more measurement beams (24, 150, 160, 228, 230) having orthogonally polarized frequency components. Systems of beamsplitters (26, 120, 124, 218, 220) and photodetectors (30, 122, 126, 206, 208) provide reference information about the frequency difference (196, 198) between the respective frequency components in the measurement beams (24, 150, 160, 228, 230). The frequency difference (196, 198) is tunable across a wide range, specifically including 4 MHz to 40 MHz when the lasers (12, 16, 102, 112, 202, 204) are conventional He--Ne types.
    • 本发明是采用成对的简单激光器(12,16)或成对的塞曼型激光器(102,112或202,204)的激光系统(10,100,200)。 射束机(20,108,210,212,214),半波片(106,116)和偏振分光镜(22,104,114,188,216)的系统将一个激光器(12,16)的频率分量 ,102,112,202,204)与另一个产生具有正交极化频率分量的一个或多个测量光束(24,150,160,228,230)。 分束器(26,120,124,218,220)和光电检测器(30,122,126,206,208)的系统提供关于测量光束(24)中的各个频率分量之间的频率差(196,198)的参考信息 ,150,160,228,230)。 当激光器(12,16,102,112,202,204)是常规He-Ne类型时,频率差(196,198)可以在宽范围内可调谐,特别地包括4MHz至40MHz。