Process and apparatus for automatically determining the modulation transfer function of focal plane array cameras
    32.
    发明申请
    Process and apparatus for automatically determining the modulation transfer function of focal plane array cameras 有权
    自动确定焦平面阵列相机的调制传递函数的过程和装置

    公开(公告)号:US20030086079A1

    公开(公告)日:2003-05-08

    申请号:US10284136

    申请日:2002-10-31

    IPC分类号: G01M011/00

    CPC分类号: H04N17/002 G01M11/0292

    摘要: In a process for automatically determining the modulation transfer function (MTF) of a focal plane array (FPA) cameras, a test grid is used to generate a beat whose amplitude corresponds to that of the grid image to be measured, without the sampling MTF. (The image of the test grid has a spatial frequency in the detector plane that is detuned with respect to the Nyquist frequency of the detector array. The test grid covers a range of at least half a beat period, and then, regardless of the actual phase position, the modulation amplitude is determined therefrom. Comparative MTF measurements are thereby permitted without the influence of the sampling effect of an FPA, and particularly the MTF measurement in real time suitable for the application to moving images.

    摘要翻译: 在用于自动确定焦平面阵列(FPA)相机的调制传递函数(MTF)的过程中,使用测试网格来生成其幅度对应于待测量的网格图像的拍子,而不需要采样MTF。 (测试网格的图像在检测器平面中具有相对于探测器阵列的奈奎斯特频率失谐的空间频率,测试网格覆盖至少半个拍摄周期的范围,然后,无论实际情况如何 相位位置,由此确定调制幅度,从而允许比较MTF测量,而不受FPA的采样效果的影响,特别是适用于运动图像的实时MTF测量。

    Rotational rate comparator for a fiber optic gyroscope with a 3.times.3
coupler
    33.
    发明授权
    Rotational rate comparator for a fiber optic gyroscope with a 3.times.3 coupler 失效
    具有3x3耦合器的光纤陀螺仪的转速比较器

    公开(公告)号:US6151126A

    公开(公告)日:2000-11-21

    申请号:US251857

    申请日:1999-02-17

    IPC分类号: G01C19/72

    CPC分类号: G01C19/725

    摘要: A rotational rate comparator for a fiber optic gyroscope has a 3.times.3 coupler and an evaluating computer to calculate the rotational rate from photodiode signals generated by the fiber optic gyroscope. An electrical circuit is provided that is independent of the evaluating computer, and embodies an algorithm for producing at least one signal that depends on the rotational rate as a function of the photodiode signals. When the rotational rate dependent signal exceeds at least one presettable limiting value the comparator supplies an output signal.

    摘要翻译: 用于光纤陀螺仪的旋转速率比较器具有3×3耦合器和评估计算机,以计算由光纤陀螺仪产生的光电二极管信号的转速。 提供了独立于评估计算机的电路,并且实现了用于产生取决于作为光电二极管信号的函数的旋转速率的至少一个信号的算法。 当旋转速率相关信号超过至少一个预设限制值时,比较器提供输出信号。