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    • 2. 发明授权
    • Terahertz radiation mixer
    • 太赫兹辐射混合器
    • US07376403B1
    • 2008-05-20
    • US11113635
    • 2005-04-25
    • Michael C. WankeS. James AllenMark Lee
    • Michael C. WankeS. James AllenMark Lee
    • H04B1/18
    • H03D7/125H01L29/205H01L29/7783
    • A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch-off mode or a narrowband resonant plasmon mode by changing a grating gate bias of the FET. The mixer can beat an RF signal frequency against a local oscillator frequency to generate an intermediate frequency difference signal in the microwave region. The mixer can have a low local oscillator power requirement and a large intermediate frequency bandwidth. The terahertz radiation mixer is particularly useful for terahertz applications requiring high resolution.
    • 太赫兹辐射混合器包括具有高电子迁移率异质结构的外差场效应晶体管(FET),其在FET的沟道区域中提供可点缀的二维电子气。 混频器可以通过改变FET的栅极栅极偏置来工作在宽带夹断模式或窄带谐振等离子体激元模式。 混频器可以针对本地振荡器频率击败RF信号频率,以在微波区域中产生中频差信号。 混频器可以具有低本地振荡器功率要求和大的中频带宽。 太赫兹辐射混合器对于需要高分辨率的太赫兹应用特别有用。
    • 4. 发明授权
    • Direct detector for terahertz radiation
    • 用于太赫兹辐射的直接检测器
    • US07420225B1
    • 2008-09-02
    • US11290090
    • 2005-11-30
    • Michael C. WankeMark LeeEric A. ShanerS. James Allen
    • Michael C. WankeMark LeeEric A. ShanerS. James Allen
    • H01L31/0328H01L31/0336H01L31/072H01L31/109H01L29/06
    • H01L31/119B82Y10/00H01L23/647H01L23/66H01L29/775H01L2924/0002H01L2924/19104H01L2924/00
    • A direct detector for terahertz radiation comprises a grating-gated field-effect transistor with one or more quantum wells that provide a two-dimensional electron gas in the channel region. The grating gate can be a split-grating gate having at least one finger that can be individually biased. Biasing an individual finger of the split-grating gate to near pinch-off greatly increases the detector's resonant response magnitude over prior QW FET detectors while maintaining frequency selectivity. The split-grating-gated QW FET shows a tunable resonant plasmon response to FIR radiation that makes possible an electrically sweepable spectrometer-on-a-chip with no moving mechanical optical parts. Further, the narrow spectral response and signal-to-noise are adequate for use of the split-grating-gated QW FET in a passive, multispectral terahertz imaging system. The detector can be operated in a photoconductive or a photovoltaic mode. Other embodiments include uniform front and back gates to independently vary the carrier densities in the channel region, a thinned substrate to increase bolometric responsivity, and a resistive shunt to connect the fingers of the grating gate in parallel and provide a uniform gate-channel voltage along the length of the channel to increase the responsivity and improve the spectral resolution.
    • 用于太赫兹辐射的直接检测器包括具有一个或多个在通道区域中提供二维电子气的量子阱的光栅门控场效应晶体管。 光栅可以是具有至少一个可以单独偏置的手指的分割光栅门。 将分光栅门的单根手指偏压到接近夹点,大大增加了检测器的谐振响应幅度,超过了现有的QW FET检测器,同时保持了频率选择性。 分光栅门控QW FET显示对FIR辐射的可调谐共振等离子体响应,这使得可以在无可移动的机械光学部件上实现电扫描光谱仪。 此外,窄频谱响应和信噪比足以在无源多光谱太赫兹成像系统中使用分光栅门控QW FET。 检测器可以在光电导或光伏模式下工作。 其他实施例包括均匀的前门和后门,以独立地改变沟道区域中的载流子密度,减薄的衬底以增加测温响应性,以及电阻分流器,以并行连接光栅门的指状物,并沿着栅极通道电压提供均匀的栅极通道电压 通道的长度增加了响应度并提高了光谱分辨率。
    • 9. 发明授权
    • Temperatures stable saw sensor with third-order elastic constants
    • 温度稳定的锯齿传感器具有三阶弹性常数
    • US07202589B2
    • 2007-04-10
    • US10492724
    • 2002-10-16
    • Victor Alexandrovich KalininMark Lee
    • Victor Alexandrovich KalininMark Lee
    • H03H9/25
    • H03H9/02834G01D5/485G01L1/165G01L3/106
    • A surface acoustic wave (SAW) sensor includes a transducer (240 provided on a substrate (23), wherein the transducer (24) is oriented on the substrate (23) so that the direction of acoustic wave propagation is such that the variation of sensor output with temperature, associated with the variation of the substrate third-elastic constants with temperature, substantially equal but opposite to the sum total of the variation of sensor output with temperature associated with the substrate linear temperature coefficient of expansion and with the variations with temperature of the substrate non-zero third order elastic constants, the substrate first-order elastic constants and the substrate density. The effect of temperature variation on sensor output is thereby minimized. This is achieved with a 35-degree arrangement or with reflective gratings inclined at an angle of 3.1 degrees to normal. Additionally, a robust package with a dish is given. Particular applications include the measurement of torque.
    • 表面声波(SAW)传感器包括换能器(240),其设置在基板(23)上,其中换能器(24)定向在基板(23)上,使得声波传播的方向使得传感器 与温度的输出相关联的第三弹性常数与温度的变化相关,基本上等于但与传感器输出的变化与基板线性温度系数膨胀的温度的变化总和相反, 衬底非零三阶弹性常数,衬底一级弹性常数和衬底密度,因此温度变化对传感器输出的影响最小化,这是通过35度布置或反射光栅倾斜于 角度为3.1度至正常值,另外,还提供了带有盘的强力包装,具体应用包括测量 扭矩。
    • 10. 发明申请
    • Inspection system and associated method
    • 检验系统及相关方法
    • US20070039390A1
    • 2007-02-22
    • US11205964
    • 2005-08-17
    • Michael DuncanMark LeeFred Young
    • Michael DuncanMark LeeFred Young
    • G01N29/04
    • G01N29/226G01N29/265G01N2291/2694
    • A system and method for inspecting a structure are provided. The system includes at least one non-destructive inspection (“NDI”) sensor capable of acquiring data indicative of at least a portion of the structure, and at least one positional sensor for acquiring positional data of the NDI sensor. The system also includes a mechanism operable to trigger the NDI sensor and/or the positional sensor to acquire data such that data indicative of the structure and the positional data are acquired at approximately the same time. The system further includes a movable arm carrying the sensors and movably attached to a base. The system includes a data acquisition system capable of communicating with the sensors such that the data acquisition system generates information indicative of at least a portion of the structure based on the data acquired by the sensors.
    • 提供了一种用于检查结构的系统和方法。 该系统包括能够获取表示该结构的至少一部分的数据的至少一个非破坏性检查(“NDI”)传感器,以及用于获取NDI传感器的位置数据的至少一个位置传感器。 该系统还包括可操作以触发NDI传感器和/或位置传感器以获取数据的机构,使得在大约相同的时间获取指示结构和位置数据的数据。 所述系统还包括携带所述传感器并可移动地附接到基座的可移动臂。 该系统包括能够与传感器通信的数据采集系统,使得数据采集系统基于由传感器获取的数据生成指示结构的至少一部分的信息。