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公开(公告)号：US4813766A
公开(公告)日：1989-03-21
申请号：US162992
申请日：1988-03-02
CPC分类号： H01Q3/2676 , G02B26/06 , G02B5/3066 , G02F1/01
摘要： An optical time delay unit for use in an optical phased array beam-steering system includes a switchable polarization rotator in conjunction with Brewster plates and mirrors to form electrically-selectable optical paths of different lengths. The switchable polarization rotator is aligned with the optical beam and is responsive to a control signal for varying the polarization of light passing therethrough. The Brewster plates receive the light passing through the first polarization rotator and are transmissive to a first polarization and reflective of a second. The transmissive and reflective paths are of different lengths, and are recombined at a second Brewster plate. The original polarization may be restored by a second polarization rotator. A plurality of time delay units may be cascaded to permit selection from among many paths of various lengths. In a preferred embodiment, the polarization rotators include liquid crystal cells having nematic phase molecules. Optically-transparent electrodes are formed on the cell windows by an ion implantation process. A planar phased array beam-forming system comprises a plurality of time delay units, illustratively arranged in a 2-by-2 configuration, wherein each unit is illuminated by a corresponding sector of a single light beam.
摘要翻译： 用于光相控阵光束转向系统的光学延迟单元包括与布鲁斯特板和反射镜相结合的可切换偏振旋转器，以形成不同长度的电选择光路。 可切换的偏振旋转器与光束对准，并且响应于控制信号来改变通过其中的光的偏振。 布鲁斯特板接收通过第一偏振旋转器的光，并且对第一偏振透射并反射第二偏振。 透射和反射路径具有不同的长度，并且在第二布鲁斯特板上重组。 原始极化可以由第二偏振旋转器恢复。 可以级联多个时间延迟单元以允许从各种长度的许多路径中进行选择。 在优选实施例中，偏振旋转器包括具有向列相分子的液晶单元。 通过离子注入工艺在电池窗口上形成光学透明电极。 平面相控阵波束形成系统包括多个时间延迟单元，其示例性地以2乘2配置排列，其中每个单元由单个光束的相应扇区照射。
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公开(公告)号：US5170218A
公开(公告)日：1992-12-08
申请号：US677696
申请日：1991-03-29
申请人： Wayne H. Keene
发明人： Wayne H. Keene
摘要： A laser radar system for measuring wind velocities including apparatus for permitting the system to measure the direction of the atmospheric flow field. A modulator is used to chirp the laser frequency toward increasing frequencies. The local oscillator frequency available for homodyning will be offset from the initial transmitted frequency by an amount equal to the chirp rate multiplied by the round trip transit time to the aerosols at the focal point of the converging laser beam. During the up-ramped chirps of the optical beam frequency, the Doppler shift frequency of aerosols moving toward the laser beam will be translated to a lower frequency, and the Doppler shift frequency of aerosols moving away from the laser beam will be frequency translated upward.
摘要翻译： 一种用于测量风速的激光雷达系统，包括允许系统测量大气流场方向的装置。 调制器用于将激光频率啁啾到增加的频率。 可用于校正的本地振荡器频率将从初始发射频率偏移等于啁啾率乘以会聚激光束焦点处的气溶胶的往返行进时间的量。 在光束频率的上升啁啾期间，朝向激光束移动的气溶胶的多普勒频移将被转换为较低的频率，并且离开激光束的气溶胶的多普勒频移将向上频率转换。
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13.发明授权Coherent detection lag angle compensated scanning system independent of inhomogeneities of the detector 失效相干检测滞后角补偿扫描系统独立于检测器的不均匀性
公开(公告)号：US4311385A
公开(公告)日：1982-01-19
申请号：US200854
申请日：1980-10-27
申请人： Wayne H. Keene
发明人： Wayne H. Keene
CPC分类号： G01S7/4972 , G01B11/26 , G01S7/4917
摘要： A coherent detection scanning laser system having an optical system that compensates for the angular deviation of the received signal resulting from the scanning process, and having a detection system with output independent of spatially varying sensitivity or response of the detector caused by inhomogeneities therein.In one embodiment, the local oscillator reference signal is compensated for the lag angle and the detector is placed at the image plane of the scanning antenna, and system geometry is arranged so that the image plane of the mirror providing the compensating reference signal coincides with the image plane of the scanning antenna. In another embodiment, the received signal is compensated for lag angle and the system geometry is arranged so that the detector receives a focused signal permitting the use of a smaller area.
摘要翻译： 一种相干检测扫描激光系统，其具有补偿由扫描过程产生的接收信号的角度偏差的光学系统，并且具有独立于由不均匀性引起的检测器的空间变化的灵敏度或响应的输出的检测系统。 在一个实施例中，本地振荡器参考信号被补偿滞后角，并且检测器被放置在扫描天线的图像平面处，并且系统几何形状被布置成使得提供补偿参考信号的反射镜的像平面与 扫描天线的图像平面。 在另一个实施例中，接收的信号被补偿滞后角，并且系统几何形状被布置成使得检测器接收允许使用更小面积的聚焦信号。
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公开(公告)号：US4311384A
公开(公告)日：1982-01-19
申请号：US601764
申请日：1975-08-04
申请人： Wayne H. Keene
发明人： Wayne H. Keene
CPC分类号： G01S7/4817 , G01S7/4812 , G01S7/499
摘要： A scanning laser doppler system in which the change in angle between transmitted and received beams caused by the finite transit time to the target is automatically compensated. The scanning beam is produced as a downward looking Palmer scan pattern by an expanded laser beam transmitted through a rotating wedge. The rotating wedge is tilted in accordance with the invention to align the received beam with a portion of the transmitted beam upon a detector.
摘要翻译： 一种扫描激光多普勒系统，其中自动补偿由到目标的有限传播时间引起的发射和接收光束之间的角度变化。 扫描光束通过透过旋转楔形体的扩大的激光束产生为向下看的帕尔默扫描图案。 根据本发明，旋转楔倾斜以将接收的波束与发射波束的一部分对准在检测器上。
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公开(公告)号：US3958881A
公开(公告)日：1976-05-25
申请号：US90526
申请日：1970-11-18
摘要： In a laser system, the method of operating a laser simultaneously as an oscillator to produce a beam of coherent light and as an amplifier for backscattered light from targets illuminated by the coherent light in such beam is disclosed.
摘要翻译： 在激光系统中，公开了作为振荡器同时操作激光以产生相干光束的方法，并且用作用于由该光束中的相干光照射的目标的后向散射光的放大器的方法。
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