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    • 1. 发明授权
    • Spectral filter
    • US09766128B1
    • 2017-09-19
    • US07220697
    • 1988-07-06
    • Herbert A. FrenchPhilip Sutton
    • Herbert A. FrenchPhilip Sutton
    • G02B27/46G01J3/45G01J9/00
    • G01J3/45G01J3/0229G01J3/0297G01J3/18G01J9/00G01J2003/1213G01J2003/1278
    • A filter for removing coherent radiation from a source in a field of view, substantially independent of the size of the source, comprises a first reticle 22 located in the path of received light 21, a first lens 23 producing an optical transform of the first reticle 22 at a second reticle 24 located in the image plane of the first lens 23, a second lens 25 producing an optical transform of the second reticle 24 and a third reticle 26 located in the image plane of the second lens 25. The arrangement is such that the spatial transmittance of the third reticle 26 is selected to block at least part of the diffracted image of the first reticle 22 produced in the image plane of the second lens 25 and characteristic of the coherent radiation. Preferably the optical transforms are Fourier Transforms. A monochromatic coherent source in the field of view produces a pattern of diffracted energy in the image plane of the second lens which is independent of the size of the source. Thus, by providing a suitable reticle 26 in the image plane of the second lens light from a coherent source in the field of view can be blocked while polychromatic light is transmitted. The first and second reticles may be periodic picket-fence reticles or different spatial frequencies may be used for the first and third reticles so as to vary the stop-band characteristics of the filter.
    • 2. 发明授权
    • Radiation interference devices
    • 辐射干扰装置
    • US4722604A
    • 1988-02-02
    • US461203
    • 1983-01-20
    • Herbert A. FrenchPhilip Sutton
    • Herbert A. FrenchPhilip Sutton
    • G01J3/45G01J9/02G01B9/02H04B9/00
    • G01J9/02G01J2009/0211G01J3/45
    • An interference device for discriminating between radiation sources of differing coherence length comprises means to divide received radiation from a source into two components. A path difference, defining a coherence length cut-off, is introduced into the path of one component and the components are brought together for interference. The recombined light passes through a reticle with alternate opaque and tranparent bars and an optical band-pass filter to a detector. Interference fringes present in the plane of the reticle are swept across the reticle by the action of the collection optical system of the device which includes a scanning rotating mirror. Two similar devices can be arranged for band-pass coherence length filtering and when used in conjunction with a light soruce whose coherence is modulated the device can be used for signalling.
    • 用于区分不同相干长度的辐射源的干扰装置包括将来自源的接收辐射分成两部分的装置。 定义相干长度截止的路径差被引入到一个组件的路径中,并且组件被聚集在一起用于干扰。 重新组合的光通过具有交替的不透明透明棒和光学带通滤光器的掩模版到检测器。 通过包括扫描旋转镜的装置的收集光学系统的作用,存在于掩模版的平面中的干涉条纹扫过光罩。 可以安排两个类似的装置用于带通相干长度滤波,并且当与光耦合器一起使用时,其相干性被调制,该装置可以用于信令。
    • 7. 发明授权
    • Optical multiplexer
    • 光复用器
    • US5363221A
    • 1994-11-08
    • US937860
    • 1992-10-16
    • Philip SuttonAndrew P. ShawWilliam DawberPeter F. HirstBrian Condon
    • Philip SuttonAndrew P. ShawWilliam DawberPeter F. HirstBrian Condon
    • H04J14/00H04B10/11H04J14/02H04Q3/52G02F1/11H04B10/00
    • H04B10/11H04J14/02
    • Light from a laser (10) is divided by a beam splitter (12) to provide signal (15) and reference (14) channels. The signal channel light is expanded (11) to illuminate an acousto-optic (AO) device (13). This leads to a spatial distribution of Doppler shifted frequencies. This spatial distribution then illuminates a spatial light modulator (SLM) (19) such that a number of parallel and discrete optical channels (112) emerge. In a local area network (LAN) the optical signal channels are coupled into a single mode optical fibre (22) and then heterodont to the reference laser light from a further optical fibre (23) in an optical coupler (25). In a receiver the modulated light is detected (32) and the detected signal connected to the transducer of an AO device (35). The AO device (35) is illuminated by a receiver laser light (36) and the emerging modulated light is incident on a focal plane detector array (39) where each detector (310) then receives light corresponding to each of the transmitted channels (311). A secure free space communications system is possible by separate transmission of a delayed (43) unmodulated reference signal. The receiver is then arranged to include an identical delay (55) in the signal channels before coupling together the signal and reference channels (56) for modulating the AO cell (35). By this means the transmission delay lines (43) and the reference delay lines (55) must have delays which are equal within the coherence length of the source laser.
    • PCT No.PCT / GB91 / 00382 Sec。 371日期:1992年10月16日 102(e)日期1992年10月16日PCT 1991年3月11日PCT公布。 WO91 / 14321 PCT出版物 日期:1991年9月19日。来自激光(10)的光由光束分离器(12)分开,以提供信号(15)和参考(14)通道。 信号通道光被扩展(11)以照亮声光(AO)装置(13)。 这导致多普勒频移的空间分布。 该空间分布然后照亮空间光调制器(SLM)(19),使得出现多个平行和离散的光通道(112)。 在局域网(LAN)中,光信号通道耦合到单模光纤(22)中,然后与来自光耦合器(25)中的另一光纤(23)的参考激光异相。 在接收机中,检测调制的光(32),并且检测到的信号连接到AO设备(35)的换能器。 AO器件(35)被接收器激光(36)照射,并且出现的调制光入射到焦平面检测器阵列(39)上,其中每个检测器(310)然后接收与每个发送的通道(311)相对应的光 )。 可以通过单独传输延迟(43)未调制的参考信号来实现安全的自由空间通信系统。 然后,接收器被布置为在将信号和参考通道(56)耦合在一起以用于调制AO单元(35)之前在信号通道中包括相同的延迟(55)。 通过这种方式,传输延迟线(43)和参考延迟线(55)必须具有在源激光器的相干长度内相等的延迟。
    • 8. 发明授权
    • Electro-optical detection system
    • 电光检测系统
    • US5880771A
    • 1999-03-09
    • US364685
    • 1989-05-09
    • Philip Sutton
    • Philip Sutton
    • G01S7/487G01S7/493G01V8/10H04N7/00H04N5/33
    • G01V8/10
    • An electro-optical detection system for detecting objects embedded in a partially transmitting medium. The system includes a receiver for receiving electromagnetic radiation and a device for separating the received radiation into two separate spectral channels. A detector in each of the spectral channels for providing a signal indicative of the received radiation in each spectral channel. A signal processor, responsive to the outputs of the detectors, having a signal channel where transmission of light of the signal channel wavelength in the medium is high and having a reference channel where attenuation of light of the reference channel wavelength in the medium is high. The signal processor ensures that the reflected light at both signal and reference wavelengths are of similar intensity and geometric distribution. A subtractor provides a difference output in which the signal and reference channels are subtracted, removing the effect of reflected light.
    • 一种用于检测嵌入在部分传送介质中的物体的电光检测系统。 该系统包括用于接收电磁辐射的接收器和用于将接收到的辐射分离成两个单独光谱通道的装置。 每个频谱信道中的检测器,用于提供指示每个频谱信道中接收到的辐射的信号。 响应于检测器的输出的信号处理器具有信号通道,其中介质中的信号通道波长的光的透射高,并且具有介质中基准通道波长的光的衰减高的参考通道。 信号处理器确保信号和参考波长处的反射光具有相似的强度和几何分布。 减法器提供差分输出,其中减去信号和参考通道,消除反射光的影响。
    • 10. 发明授权
    • Electro-optical detection system for reflection free underwater images
from aircraft
    • 用于飞机无反射水下图像的电光检测系统
    • US5444441A
    • 1995-08-22
    • US182044
    • 1994-05-18
    • Philip Sutton
    • Philip Sutton
    • G01J3/46G01S7/497G01S17/89G06T1/00H04B13/02G01J3/00G01S13/00
    • G01S7/497G01S17/89
    • An electro-optical detection system for detecting objects 12 embedded within a partially transmitting medium comprises means 20 to receive electro-magnetic radiation in two close spectral channels 28, 212: a signal channel 212 where the wavelength and bandwidth of the signal channel are optimized to correspond to the peak of transmission of the medium and a reference channel 28 where the wavelength and bandwidth are selected to correspond to a spectral region where attenuation in the medium is high. The signal and reference channels are then subtracted (213) so as to remove the effect of reflected radiation from the signal channel 212. The signal is processed digitally (218) to provide an enhanced image of the field of view. In a particular arrangement for detecting objects underwater a CCD TV camera 20 is used with three separate CCD detector arrays providing concurrent red (R), green (G), blue (B) output signals. The green and blue signals are combined in an adjustable ratio to provide the image signal to match the prevailing conditions of the partially transmitting sea. A notch filter is employed to cut out light in a spectral band between the signal and reference channels.
    • PCT No.PCT / GB92 / 01242 Sec。 371日期:1994年5月18日 102(e)日期1994年5月18日PCT提交1992年7月9日PCT公布。 公开号WO93 / 02367 日期:1993年2月4日。用于检测嵌入在部分传输介质中的物体12的电光检测系统包括用于在两个近光谱通道28,212中接收电磁辐射的装置20:信号通道212,其中波长和带宽 信号通道的优化对应于介质的传输峰值和参考通道28,其中选择波长和带宽以对应于介质中的衰减高的光谱区域。 然后减去信号和参考通道(213),以消除来自信号通道212的反射辐射的影响。信号被数字地处理(218)以提供视场的增强图像。 在用于水下检测物体的特定布置中,CCD电视摄像机20与三个独立的CCD检测器阵列一起使用,其提供并发红(R),绿(G),蓝(B)输出信号。 绿色和蓝色信号以可调节的比例组合,以提供图像信号以匹配部分传播海域的主要条件。 采用陷波滤波器来切割信号和参考信道之间的频谱带中的光。