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    • 44. 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。
    • 46. 发明授权
    • Measuring torsional distortion with an easily applied clip device (saw)
    • 用易于使用的夹具(锯)测量扭转变形
    • US07222541B2
    • 2007-05-29
    • US10528418
    • 2003-09-16
    • Raymond David LohrDavid Daniel George VileMark Lee
    • Raymond David LohrDavid Daniel George VileMark Lee
    • G01N3/22
    • G01L3/10
    • A device for measuring torsional distortion of a body comprises first and second clip portions each having a central part and two legs depending from the central part, each leg having adjacent the free end thereof a groove or projection for engaging a respective projection or groove (14) provided in the body (16) to mount the clip portion the body rotationally fastened therewith. A bridge interconnects the clip portion. The bridge is less stiff than the clip portions whereby relative rotational displacement of the clip portions caused by torsional distortion of the body will cause proportional deflection of the bridge. Means, for example a SAW device (15), are provided for measuring the deflection of the bridge to provide an indication of the torsional distortion which produces the deflection of the bridge. Also (20) for the interior all of a hollow body.
    • 用于测量主体的扭转变形的装置包括第一和第二夹子部分,每个夹子部分具有中心部分和两个从中心部分延伸的两个腿部,每个腿部具有邻近其自由端的用于接合相应突起或凹槽(14)的凹槽或突起 )设置在主体(16)中以将夹具部分安装在与其旋转地紧固的主体上。 桥连接夹子部分。 桥梁比夹子部分不那么硬,由此由夹子的扭转扭曲引起的夹子部分的相对旋转位移将导致桥梁的比例偏转。 提供了例如SAW器件(15)的装置,用于测量桥的偏转以提供产生桥的偏转的扭转变形的指示。 还有(20)为内部所有的空心体。
    • 47. 发明申请
    • Pressure monitor incorporating saw device
    • 压力监视器包括锯装置
    • US20050225214A1
    • 2005-10-13
    • US10508468
    • 2003-03-17
    • Victor KalininMark LeeRaymond LohrArthur Leigh
    • Victor KalininMark LeeRaymond LohrArthur Leigh
    • G01L1/16G01L9/00G01L19/00H01L41/08
    • G01L19/0092G01L1/165G01L9/0025
    • A pressure monitor has a base and a lid secured to the base to define a substantially fluid tight chamber. At least part of the lid is flexible and forms a diaphragm which deflects responsive to changes in fluid pressure surrounding the monitor. A projection provided on the diaphragm transmits movement thereof to a distortable substrate located within the chamber. A first SAW device is mounted on the distortable substrate, and at least a second and third SAW device are mounted within the chamber. The second SAW device carried on a reference substrate section has its direction of propagation inclined at an angle to the direction of propagation of at least one of the first and third SAW devices. This way movement of the diaphragm induced by a change in pressure in the zone surrounding the monitor results in distortion of the distortable substrate, which is measurable by the SAW device mounted thereon, without distorting said reference substrate section.
    • 压力监视器具有固定到基座的底座和盖子,以限定基本上流体密封的腔室。 盖的至少一部分是柔性的,并且形成响应于监视器周围的流体压力变化而偏转的隔膜。 设置在隔膜上的突起将其运动传递到位于室内的可变形基板。 第一SAW器件安装在可变形衬底上,并且至少第二和第三SAW器件安装在腔室内。 携带在参考基板部分上的第二SAW器件具有与第一和第三SAW器件中的至少一个的传播方向成一角度的传播方向。 以这种方式由围绕监视器的区域中的压力变化引起的隔膜的移动导致可变形的衬底的变形,其可由安装在其上的SAW器件测量,而不会使所述参考衬底部分变形。
    • 50. 发明授权
    • Wellbore wash nozzle system
    • 井筒清洗喷嘴系统
    • US06189618B1
    • 2001-02-20
    • US09063202
    • 1998-04-20
    • Robert S. BeemanMark LeeGuy L. McClung, IIIStephen P. Breaux
    • Robert S. BeemanMark LeeGuy L. McClung, IIIStephen P. Breaux
    • E21B2110
    • E21B34/14B05B3/027B05B3/06E21B37/00
    • A wash nozzle for wellbore washing operations has been invented, the wash nozzle, in one aspect having a central mandrel with a top, a bottom, and a fluid flow bore therethrough from top to bottom, at least one mandrel port through the central mandrel for fluid flow from within the central mandrel's fluid flow bore to an exterior of the central mandrel, a hollow sleeve rotatably mounted around the central mandrel, and at least one sleeve port through the sleeve for fluid flow from within the sleeve from the exterior of the central mandrel to an exterior of the sleeve, the at least one sleeve port defined by a wall on the sleeve. In one aspect the wash nozzle includes apparatus for selective rotation of the sleeve about the mandrel. In one aspect flow through the wash nozzle is stopped to effect sleeve rotation and, in one particular aspect, flow through the nozzle is then re-established. Methods have been invented using such wash nozzles for wellbore washing operations and/or cuttings removal.
    • 已经发明了用于井眼清洗操作的洗涤喷嘴,洗涤喷嘴在一个方面具有中心心轴,其具有顶部,底部和从顶部到底部穿过其的流体流动孔,至少一个通过中心心轴的心轴端口,用于 流体从中心心轴的流体流动孔内流出到中心心轴的外部,围绕中心心轴可旋转地安装的中空套管,以及通过套筒的至少一个套筒端口,用于从套筒内部从中心的外部流体流动 心轴到套筒的外部,所述至少一个套筒端口由套筒上的壁限定。 在一个方面,洗涤喷嘴包括用于围绕心轴选择性旋转套筒的装置。 在一个方面,通过洗涤喷嘴的流动停止以实现套筒旋转,并且在一个特定方面,然后重新建立通过喷嘴的流动。 已经发明了使用这种洗涤喷嘴进行井眼清洗操作和/或切割去除的方法。