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    • 3. 发明授权
    • Through flame optical viewing
    • 通过火焰光学观察
    • US4794452A
    • 1988-12-27
    • US9846
    • 1987-01-30
    • Jeffrey D. TaftJames F. Ellison
    • Jeffrey D. TaftJames F. Ellison
    • F27D21/02G01N21/55G02B23/24H04N7/18
    • F27D21/02G01N21/55G02B23/2492F27D2021/026
    • A method and apparatus for illuminating a target, for example the wall and internal structures of a coal, oil, or gas fired combustion chamber for remote viewing. A coherent light source is used to illuminate the target with illumination of a selected spectral content different from that produced by ambient light resulting from the combustion of the fuel. The coherent light illuminates the target and a narrow band optical filter is placed in front of a viewing camera to filter ambient light but to pass the illuminating source reflected from the target. The coherent light source has a wavelength range of about 422 nm to about 780 nm. Source wavelengths are chosen to be sufficiently long to penetrate particulate laden gases and still be distinguishable from thermal radiation inside the furnace. A human observer may manipulate the laser source and view the target using filter spectacles.
    • 用于照射目标的方法和装置,例如用于远程观察的煤,油或燃气燃烧室的壁和内部结构。 相干光源用于通过照射不同于由燃料燃烧产生的环境光产生的选定光谱含量来照亮目标物。 相干光照亮目标,并且将窄带光学滤光器放置在观察照相机的前面,以过滤环境光,但是通过从目标反射的照明光源。 相干光源具有约422nm至约780nm的波长范围。 源波长被选择为足够长以穿透含颗粒的气体,并且仍然可以与炉内的热辐射区分开。 人类观察者可以操纵激光源并使用滤光眼镜观察目标。
    • 5. 发明授权
    • Geometric surface inspection system with dual overlap light stripe
generator
    • 具有双重重叠光条纹发生器的几何表面检测系统
    • US4741621A
    • 1988-05-03
    • US897473
    • 1986-08-18
    • Jeffrey D. TaftJames F. Ellison
    • Jeffrey D. TaftJames F. Ellison
    • G01B11/25G01S17/42G01B11/24
    • G06T7/0057G01B11/25G01S17/42
    • The present invention includes a surface inspection system with a single light source producing two light stripe sheets projected from different angles onto an inspected surface so that a combined light sheet produces a light stripe image with no shadows results. The two light stripe sheets are created by tangentially reflecting a laser beam off of separate cylindrical reflectors. The light stripe is detected by an imaging system, including a camera having a CCD image array, held at a fixed angle with respect to the light sheet which allows the two-dimensional curvature of the stripe to be detected. The two-dimensional light stripe image is converted into a digital image and processed by linear and logical digital filters that narrow the stripe down to two pixels wide. A coordinate extraction apparatus extracts the coordinates of the bottom row of the pixel image producing a digital representation of the light stripe curve. The sample curve is compared by a computer with a reference curve by obtaining the absolute value of the difference in height of points along the sample and reference curves after alignment and comparing the absolute value to an error or tolerance threshold. Any deviation beyond the fixed tolerance is reported as a surface irregularity defect.
    • 本发明包括具有单个光源的表面检查系统,其产生从不同角度投影到被检查表面上的两个光条片,使得组合的光片产生不产生阴影的光条纹图像。 通过将激光束切向反射离开单独的圆柱形反射器来产生两个光条带片。 该光条由成像系统检测,该成像系统包括具有CCD图像阵列的照相机,该相机具有相对于允许检测条纹的二维曲率的光片固定的角度。 将二维光条纹图像转换为数字图像,并通过将条纹缩小到两个像素宽的线性和逻辑数字滤波器进行处理。 坐标提取装置提取产生光条纹曲线的数字表示的像素图像的底行的坐标。 通过计算机与参考曲线比较样本曲线,通过获得沿着样本的点的高度差和对准后的参考曲线的绝对值,并将绝对值与误差或公差阈值进行比较。 超出固定公差的任何偏差都报告为表面不规则缺陷。
    • 6. 发明授权
    • Instantaneous phasor determination for poly-phase electrical grids
    • 多相电网的瞬时相量测定
    • US08532230B2
    • 2013-09-10
    • US13222142
    • 2011-08-31
    • Jeffrey D. Taft
    • Jeffrey D. Taft
    • H04L27/06
    • G01R19/2513Y02E60/728Y04S10/265
    • In one embodiment, three substantially simultaneous phase waveforms may be converted into a first quadrature signal and a zero sequence signal. For each phase waveform, a power system digital frequency may be determined through analysis of the first quadrature signal (e.g., and at least one additional prior quadrature signal) while eliminating waveform phase angles from the analysis. Subsequently, demodulation of the first quadrature signal and zero sequence signal based on the power system digital frequency results in a positive sequence phasor, a negative sequence phasor, and a zero sequence phasor.
    • 在一个实施例中,三个基本上同时的相位波形可以被转换成第一正交信号和零序信号。 对于每个相位波形,可以通过分析第一正交信号(例如和至少一个附加的先前正交信号)来确定电力系统数字频率,同时消除来自分析的波形相位角。 随后,基于电力系统数字频率的第一正交信号和零序信号的解调产生正序相量,负序相量和零序相量。