公开(公告)号：WO1993012474A1

公开(公告)日：1993-06-24

申请号：PCT/US1992010806

申请日：1992-12-10

Applicant: ESSEX CORPORATION

Inventor： ESSEX CORPORATION ,  GESELL, Leslie, H. ,  LaFUSE, James, L.

IPC: G03H01/10

CPC classification number: H01Q3/2676 ,  G02F2/002 ,  G02F2001/212 ,  G02F2201/20 ,  G06E3/005

Abstract: Optical systems are disclosed which are capable of generating and rapidly changing time delays of electrical signals for true time delay beam formation and beam steering. The systems utilize an interferometer configuration. A first optical modulator (12) and a Fourier transform lens (18) define a Fourier transform plane in a first leg of the interferometer. In a second leg of interferometer, a second optical modulator (28) provides beam steering to a prism stack (30) which produces a set of plane reference waves having a range of orientations required to generate a desired range of time delays. Preferably the optical modulators (12, 28) are accousto optic Bragg cells. Alternatively, a holographic optic element could be used in place of the prism stack (30).

公开(公告)号：WO1994024588A1

公开(公告)日：1994-10-27

申请号：PCT/US1994003809

申请日：1994-04-07

Applicant: ESSEX CORPORATION

Inventor： ESSEX CORPORATION ,  GESELL, Leslie, H. ,  TURPIN, Terry, M.

IPC: G02B05/32

CPC classification number: G02F2/002 ,  G02B5/32 ,  G02F1/33 ,  G02F2001/212 ,  G02F2201/20 ,  G06E3/005 ,  H01Q3/2676

Abstract: Optical systems are disclosed which are capable of generating and rapidly changing time delays of electrical signals for true time delay beam formation and beam steering and for signal processing applications. The systems utilize an interferometer configuration. A first optical modulator (12) in a first leg of the interferometer (14) is used to modulate coherent light with the signal to be delayed. In a second leg of the interferometer (26), a second optical modulator (28) provides beam steering to a prism stack (30), which produces a set of plane reference waves having a range of orientations required to generate a desired range of time delays. Preferably the optical modulators are acousto optic Bragg cells (12, 28). Alternatively, a stack of lens pairs of diffractive optical elements or a holographic optic element may be used in place of the prism stack. The modulated optical signal from the first leg interferes on an array of photodiodes with the reference waves from the second leg. The resulting electrical signals out of the photodiodes (20) are delayed replicas of the signals driving the optical modulator in the first leg.

Abstract translation: 公开了能够产生并快速改变电信号的时间延迟用于真实的时间延迟波束形成和波束导向以及信号处理应用的光学系统。 该系统利用干涉仪配置。 干涉仪（14）的第一支路中的第一光调制器（12）用于调制具有要被延迟的信号的相干光。 在干涉仪（26）的第二支路中，第二光调制器（28）向棱镜堆叠（30）提供光束转向，其产生一组具有产生所需时间范围所需的取向范围的​​平面参考波 延迟。 优选地，光学调制器是声光布拉格单元（12,28）。 或者，可以使用一叠透镜对的衍射光学元件或全息光学元件来代替棱镜堆叠。 来自第一腿的经调制的光信号利用来自第二腿的参考波干扰一组光电二极管。 从光电二极管（20）中产生的电信号是驱动第一支路中的光调制器的信号的延迟复制品。

公开(公告)号：WO1993013432A1

公开(公告)日：1993-07-08

申请号：PCT/US1992010970

申请日：1992-12-17

Applicant: ESSEX CORPORATION

Inventor： ESSEX CORPORATION ,  TURPIN, Terry, M.

IPC: G01S13/89

CPC classification number: G01S17/895 ,  G01S7/20 ,  G01S7/481 ,  G01S13/89 ,  G01S13/9035 ,  G03H1/00 ,  G03H3/00 ,  G03H5/00

Abstract: A system (4) for generating an image of an object, comprising a combination of a sensing feature (2) for measuring the spatial component parameters (amplitude, phase, etc.) of the object basis functions that satisfy a Bragg condition, together with an image synthesis feature (16, 18) for generating a reconstructed image of the object using the measured parameters of the basis functions. The image reconstruction feature may optically project spatial components (6) (spatial frequencies). The image reconstruction feature may optically record the spatial frequency domain sequentially, then perform a two dimensional Fourier transform by a variety of methods. The image reconstruction feature is not restricted to optical radiation, and may include projection imaging systems that use other forms of wavelike radiation. The image reconstruction feature does not require purely digital electronic methods for producing a two-dimensional image.

Abstract translation: 一种用于生成对象的图像的系统（4），包括用于测量满足布拉格条件的对象基函数的空间分量参数（振幅，相位等）的感测特征（2）和 图像合成特征（16,18），用于使用所测量的基本函数的参数来生成所述对象的重建图像。 图像重建特征可以光学地投影空间分量（6）（空间频率）。 图像重建特征可以顺序地光学记录空间频域，然后通过各种方法进行二维傅里叶变换。 图像重建特征不限于光辐射，并且可以包括使用其他形式的波浪辐射的投影成像系统。 图像重建特征不需要用于产生二维图像的纯数字电子方法。