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    • 7. 发明授权
    • Method and apparatus for measurement of spatial signal and noise power
of imaging systems
    • 用于测量成像系统的空间信号和噪声功率的方法和装置
    • US5526113A
    • 1996-06-11
    • US263319
    • 1994-06-21
    • J. Michael LengyelRandy M. ManerLarry A. Nelson
    • J. Michael LengyelRandy M. ManerLarry A. Nelson
    • G01N21/956G02B27/46G01N21/00
    • G01N21/95623G02B27/46
    • A photographic facsimile of a line image at a predetermined orientation is illuminated by a collimated monochromatic light source to produce a diffraction pattern. The Fourier distribution of the diffraction pattern is focussed by a converging lens to image on a spatial frequency plane of spatial signal and spatial noise components. The image in the spatial frequency plane is applied to a detector for selectively measuring the spatial power contribution of the signal and noise components, thereby to provide a measure of image quality relating to imaging system signal-to-noise ratio. A spatial filter (18) may be introduced into the optical path to block the spatial signal components, while allowing the noise components to impinge on the detector. The line image is then reoriented in the image plane, and successive measurements of spatial signal and noise contributions repeated. The ratio of signal-to-noise power is then computed for each orientation of the line image. By simulating selected imaging components and generating a resultant line image, the effect of such components on noise may be determined.
    • 以预定取向的线图像的摄影传真由准直单色光源照射以产生衍射图案。 衍射图案的傅立叶分布由会聚透镜聚焦在空间信号和空间噪声分量的空间频率平面上的图像上。 将空间频率平面中的图像应用于检测器,用于选择性地测量信号和噪声分量的空间功率贡献,从而提供与成像系统信噪比相关的图像质量的度量。 可以将空间滤波器(18)引入到光路中以阻挡空间信号分量,同时允许噪声分量撞击检测器。 然后将线图像重新定向在图像平面中,并重复连续测量空间信号和噪声贡献。 然后针对线图像的每个取向计算信噪比的比率。 通过模拟所选择的成像组件并产生合成线图像,可以确定这些组件对噪声的影响。
    • 9. 发明授权
    • Optical transmitter power measurement and control
    • 光发射机功率测量与控制
    • US4991229A
    • 1991-02-05
    • US331866
    • 1989-04-03
    • Larry A. NelsonJames W. Woods
    • Larry A. NelsonJames W. Woods
    • G08C25/00H04B10/00H04B10/04
    • H04B10/50
    • A fiber optic transmission system including a fiber optic link. Transmitting apparatus transmits an optical signal having a concentration of energy at a particular wavelength. Routing apparatus then routes optical signals in response to the concentration of energy at the particular wavelength of the transmitted optical signal. The routing apparatus is disposed to receive the transmitted optical signal and also reflects a small portion of the transmitted optical signal. A first apparatus for receiving the reflected portion of the optical signal is disposed to cooperate with the routing apparatus and further has apparatus for converting the reflected portion into a control signal. Temperature sensing apparatus is disposed to sense temperature variations in the first receiving apparatus and apparatus for controlling the transmitting apparatus is adapted to receive the control signal and further is disposed so as to regulate the transmitting appratus responsively to the control signal. The controlling apparatus further operates to regulate the power of the transmitting apparatus as a function of temperature sensed by the temperature sensing apparatus so as to maintain a preselected power margin in the fiber optic link.
    • 10. 发明授权
    • Liquid handling
    • 液体处理
    • US4788150A
    • 1988-11-29
    • US27558
    • 1987-03-18
    • Larry A. NelsonWilliam A. Mace
    • Larry A. NelsonWilliam A. Mace
    • G01N35/00G01N35/02G01N35/04G01N37/00
    • G01N35/02G01N2035/00425Y10T436/111666Y10T436/113332
    • An analysis system has a first region in which sample materials are stored at an appropriate storage temperature and an analysis region which is maintained at a controlled and stabilized temperature higher than the temperature of the first region. Transfer mechanism for transferring a quantity of sample material from the first region for loading into an analysis cuvette in the analysis region includes a liquid handling probe that is mounted on a probe transport carriage, and a drive for moving the transport carriage between the first and second regions. The transport carriage includes a storage chamber connected to the liquid handling probe, thermal energy supplying means in heat exchange relation with the storage chamber, and thermal sensor means carried by the transport carriage. Means responsive to the thermal sensor supplies thermal energy to the transport carriage to maintain the storage chamber at substantially the same temperature as the analysis region.
    • 分析系统具有第一区域,其中样品材料以适当的储存温度存储,并且分析区域保持在比第一区域的温度高的受控和稳定的温度。 用于将来自第一区域的样品材料的量从用于装载到分析区域中的分析试管中的转移机构包括安装在探针输送架上的液体处理探针和用于在第一和第二 地区。 运输托架包括连接到液体处理探针的储存室,与储存室热交换的热能供应装置和由运输托架承载的热传感器装置。 响应于热传感器的装置将热能提供给运输托架,以将储存室维持在与分析区域基本相同的温度。