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    • 3. 发明授权
    • Increased well depth hact using a strained layer superlattice
    • 使用应变层超晶格增加深度深度
    • US5283444A
    • 1994-02-01
    • US918830
    • 1992-07-24
    • Robert N. SacksThomas W. GrudkowskiDonald E. CullenWilliam J. Tanski
    • Robert N. SacksThomas W. GrudkowskiDonald E. CullenWilliam J. Tanski
    • H01L29/15H03H9/02H01L29/161H01L29/205
    • H03H9/02976H01L29/155
    • A heterojunction acoustic charge transport device (HACT) having a charge transport channel 39 which is sandwiched between upper and lower charge confinement layers, 14,20, has the charge transport channel 39 made of a Strained Layer Superlattice (SLS) comprising alternating deep-well semiconductor layers 40, that provide a deep quantum well depth, and strain relief layers 42 that provide strain relief to prevent dislocations from occurring due to lattice mismatches between the InGaAs layers within the channel 39 and the charge confinement layers 14,20, thereby allowing the overall thickness of the channel 39 to be at least as wide as conventional HACT devices that use a GaAs channel. The strain relief layers 42 may be narrowly sized to allow tunneling of electrons across the entire channel 39 thereby allowing the charge to move as a single group, or alternatively, widely sized to provide separate isolated channels thereby allowing the charge to move in separate groups. Both embodiments provide increased quantum well depth in the channel 39 over conventional HACT devices.
    • 具有夹在上电荷限制层14和下电荷限制层14,20之间的电荷传输通道39的异质结声电荷输送装置(HACT)具有由包含交替深阱的应变层超晶格(SLS)制成的电荷传输通道39 提供深量子阱深度的半导体层40和应变消除层42,其提供应变消除以防止由于沟道39内的InGaAs层与电荷限制层14,20之间的晶格失配而发生位错,从而允许 通道39的总厚度至少与使用GaAs通道的常规HACT器件一样宽。 应变消除层42的尺寸可以窄,以允许电子穿过整个通道39,从而允许电荷作为单个组移动,或者可选地被广泛地设置以提供单独的隔离通道,从而允许电荷以分开的组移动。 两个实施例相对于传统的HACT装置在通道39中提供增加的量子阱深度。
    • 4. 发明授权
    • Nyquist frequency bandwidth hact memory
    • 奈奎斯特频带宽带内存
    • US5262659A
    • 1993-11-16
    • US928374
    • 1992-08-12
    • Thomas W. GrudkowskiDonald E. Cullen
    • Thomas W. GrudkowskiDonald E. Cullen
    • H01L29/765H03H9/02H01L29/84H01L29/96H01L41/08
    • H01L29/765H03H9/02976
    • A HACT device which propagates charge packets 21 along a charge transport channel 17 by a surface acoustic wave (SAW) 14 is provided with an interdigital electrode grid 30 disposed on the upper surface of the HACT, near the charge transport channel 17, having electrodes 30 spaced a distance of one-half wavelength of the SAW. A hold voltage Vh is applied across alternating electrodes to store (i.e., stop and hold) each charge packet. When a charge packet is to be released, the hold voltage Vh is removed and the electrodes 30 are shorted together or alternatively connected through a maximum allowable impedance, thereby allowing each charge packet 21 to be stored and released by the device without having the electrodes 30 absorb the SAW electric fields. Because the electrodes 30 are spaced one-half a SAW wavelength apart, the HACT memory can store each and every charge packet 21, thereby providing a Nyquist bandwidth device. Furthermore, the electrodes 30 are made thin to reduce mechanical absorption of the SAW by the electrodes.
    • 通过表面声波(SAW)14沿着电荷传送通道17传播电荷包21的HACT装置设置有设置在HACT的上表面上的交叉指状电极栅极30,电荷传输通道17附近具有电极30 隔开SAW的二分之一波长的距离。 在交替电极之间施加保持电压Vh以存储(即停止和保持)每个电荷包。 当要释放电荷包时,保持电压Vh被去除,并且电极30被短路在一起,或者通过最大允许阻抗交替地连接,从而允许每个电荷包21被器件储存和释放,而不需要电极30 吸收SAW电场。 因为电极30隔开一半的SAW波长,所以HACT存储器可以存储每一个电荷包21,从而提供奈奎斯特带宽装置。 此外,电极30被制成薄以减少由电极对SAW的机械吸收。
    • 5. 发明授权
    • Millimeter-wave active imaging system with fixed array
    • 具有固定阵列的毫米波有源成像系统
    • US07212153B2
    • 2007-05-01
    • US10728434
    • 2003-12-05
    • Richard L. RoweThomas W. GrudkowskiRaymond R. Blasing
    • Richard L. RoweThomas W. GrudkowskiRaymond R. Blasing
    • G01S13/89
    • G01S13/887G01S13/87G01S13/89H01Q3/08
    • Active millimeter-wave imaging systems can include an antenna apparatus configured to transmit toward and receive from a subject in a subject position, electromagnetic radiation. A controller can include a transceiver configured to operate the antenna apparatus and produce an output representative of the received radiation, and a processor adapted to convert the transceiver output into image data representative of an image of the subject. The antenna apparatus may move in a partial or continuous loop around the subject, toward or away from the subject, or in an opposite direction to an associated antenna apparatus. Antenna units in the antenna apparatus may be oriented at different angular positions along an array. Antenna arrays may also be formed of a plurality of array segments, and a group of arrays may be combined to form an antenna apparatus.
    • 有源毫米波成像系统可以包括被配置为朝向和接收来自被摄体位置的被摄体的电磁辐射的天线装置。 控制器可以包括被配置为操作天线装置并产生代表所接收的辐射的输出的收发器,以及适于将收发器输出转换为表示对象的图像的图像数据的处理器。 天线装置可以围绕对象,朝向或远离被摄体,或者与相关联的天线装置相反的方向以部分或连续的环路移动。 天线装置中的天线单元可以沿阵列定向在不同的角度位置。 天线阵列也可以由多个阵列段形成,并且一组阵列可以组合以形成天线装置。
    • 8. 发明授权
    • Fiber optic sensor for magnetic bearings
    • 用于磁性轴承的光纤传感器
    • US5640472A
    • 1997-06-17
    • US478701
    • 1995-06-07
    • Richard A. MeinzerThomas W. GrudkowskiEvan C. Polley
    • Richard A. MeinzerThomas W. GrudkowskiEvan C. Polley
    • F16C39/06G01B11/14G02B6/26
    • F16C32/0465F16C32/0446F16C32/048G01B11/14
    • A fiber optic sensor for magnetic bearings includes a stator 12, a rotor 14, and an optical transmit/receive fiber 50 which propagates transmit light 112 which is launched across a gap 15 between the stator and the rotor and which receives reflected light 114 that is reflected off of the rotor 14 and travels along the fiber 50 as the light 116. The gap 15 distance is determined by the change in intensity of the return light 114. The transmit/receive fiber 50 may be located radially through or longitudinally along the stator 12. The receive light 116 is detected by a photodetector 120 which provides an electrical signal to a control circuit 124 which controls electromagnetic coils 31-34 of the magnetic bearing. Alternatively, two separate fibers may be used for the transmit and receive light. Also, time or wavelength multiplexing may be employed to allow for remote optical source and detection/control of the gap 15 distance. Further, a plurality of such sensors may be used around the gap 15. Also, a temperature sensor may be embedded within the distance sensor. Further, radial and/or axial gaps may be measured.
    • 用于磁性轴承的光纤传感器包括定子12,转子14和传播透射光112的光发射/接收光纤50,透射光112跨过定子和转子之间的间隙15发射并接收反射光114 从转子14反射并沿着光116沿着光纤50行进。间隙15的距离由返回光114的强度变化确定。发射/接收光纤50可以沿着定子径向地或纵向地定位 接收光116由光电检测器120检测,光电检测器120向控制电路124提供电信号,控制电路124控制磁轴承的电磁线圈31-34。 或者,两个单独的光纤可以用于发射和接收光。 此外,可以采用时间或波长复用来允许远程光源和间隙15距离的检测/控制。 此外,可以在间隙15周围使用多个这样的传感器。而且,温度传感器可以嵌入在距离传感器内。 此外,可以测量径向和/或轴向间隙。