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1. 发明授权

US4477725A Microbending of optical fibers for remote force measurement 失效
公开(公告)号：US4477725A
公开(公告)日：1984-10-16
申请号：US297050
申请日：1981-08-27
申请人： Charles K. Asawa , Joseph W. Austin , Michael K. Barnoski , Allan R. Jackson , Stewart D. Personick , Shi-Kay Yao
发明人： Charles K. Asawa , Joseph W. Austin , Michael K. Barnoski , Allan R. Jackson , Stewart D. Personick , Shi-Kay Yao
IPC分类号： G01L5/00 , G01D5/353 , G01L1/00 , G01L1/24 , G08C15/06 , G08C23/00 , G02B5/14
CPC分类号： G01L1/245
摘要： A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector. Specific preferred constructions for microbend transducers and system arrangements particularly adapted for detecting structural strain in an oil or gas pipeline are disclosed.

2. 发明授权

US4459477A Microbending of optical fibers for remote force measurement 失效
标题翻译：用于远程力测量的光纤的微弯曲
公开(公告)号：US4459477A
公开(公告)日：1984-07-10
申请号：US297051
申请日：1981-08-27
申请人： Charles K. Asawa , Joseph W. Austin , Michael K. Barnoski , Stewart D. Personick , Shi-Kay Yao
发明人： Charles K. Asawa , Joseph W. Austin , Michael K. Barnoski , Stewart D. Personick , Shi-Kay Yao
IPC分类号： G01L1/24
CPC分类号： G01L1/245
摘要： A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector. Specific preferred constructions for microbend transducers and system arrangements particularly adapted for detecting structural strain in an oil or gas pipeline are disclosed.
摘要翻译：用于远程测量结构力的系统包括沿着结构的长度安装的多个微弯曲换能器，用于响应于结构力（例如作用在油或气体管线等上的应力）而微纤维弯曲光纤。光时域反射计（OTDR）具有用于发射用于通过光纤的脉冲光信号的光源，以及用于感测作为时间的函数的光电检测器，用于通过光纤反射回的反向散射光的强度，其中该感测时间函数为与纤维长度和结构的离散纵向位置直接相关。当一个或多个微弯变换器被激活以响应于作用在结构上的局部力引起纤维中的微弯曲时，反向散射光的一部分在微弯处丧失。反射散射光强度中的衰减由光电检测器定量和位置地识别。公开了用于微弯传感器和特别适用于检测油或气管线中的结构应变的系统布置的特定优选结构。

3. 发明授权

US4463254A Microbending of optical fibers for remote force measurement 失效
标题翻译：用于远程力测量的光纤的微弯曲
公开(公告)号：US4463254A
公开(公告)日：1984-07-31
申请号：US297058
申请日：1981-08-27
申请人： Charles K. Asawa , Michael K. Barnoski , Shi-Kay Yao
发明人： Charles K. Asawa , Michael K. Barnoski , Shi-Kay Yao
IPC分类号： G01L1/24
CPC分类号： G01L1/245
摘要： A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microband transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector. Specific preferred constructions for microbend transducers and system arrangements particularly adapted for detecting structural strain in an oil or gas pipeline are disclosed.
摘要翻译：用于远程测量结构力的系统包括沿着结构的长度安装的多个微弯曲换能器，用于响应于结构力（例如作用在油或气体管线等上的应力）而微纤维弯曲光纤。光学时域反射计（OTDR）具有用于发射用于通过光纤的脉冲光信号的光源和用于感测作为时间的函数的光电检测器，通过光纤反射回反向散射光的强度，其中该感测时间函数为与纤维长度和结构的离散纵向位置直接相关。当一个或多个微带换能器被激活以响应于作用在结构上的局部力引起纤维中的微弯曲时，部分后向散射光在微弯处丧失。反射散射光强度中的衰减由光电检测器定量和位置地识别。公开了用于微弯传感器和特别适用于检测油或气管线中的结构应变的系统布置的特定优选结构。

4. 发明授权

US4421979A Microbending of optical fibers for remote force measurement 失效
标题翻译：用于远程力测量的光纤的微弯曲
公开(公告)号：US4421979A
公开(公告)日：1983-12-20
申请号：US297052
申请日：1981-08-27
申请人： Charles K. Asawa , Shi-Kay Yao
发明人： Charles K. Asawa , Shi-Kay Yao
IPC分类号： G01L1/24 , G02B5/14
CPC分类号： G01L1/245
摘要： A system for remote measurement of structural forces includes a plurality of microbend transducers mounted along the length of the structure for microbending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector. Specific preferred constructions for microbend transducers and system arrangements particularly adapted for detecting structural strain in an oil or gas pipeline are disclosed.
摘要翻译：用于远程测量结构力的系统包括沿着结构的长度安装的多个微弯曲换能器，用于响应于结构力（例如作用在油或气体管线等上的应力）而微纤维弯曲光纤。光时域反射计（OTDR）具有用于发射用于通过光纤的脉冲光信号的光源，以及光电检测器，用于根据通过光纤反射回的反向散射光的强度随时间感测，其中该感测时间函数为与纤维长度和结构的离散纵向位置直接相关。当一个或多个微弯变换器被激活以响应于作用在结构上的局部力引起纤维中的微弯曲时，反向散射光的一部分在微弯处丧失。反射散射光强度中的衰减由光电检测器定量和位置地识别。公开了用于微弯传感器和特别适用于检测油或气管线中的结构应变的系统布置的特定优选结构。

5. 发明授权

US4942623A Device and method for modal separation and combination in an optical fiber intrusion detection system 失效
标题翻译：光纤入侵检测系统中模态分离和组合的装置和方法
公开(公告)号：US4942623A
公开(公告)日：1990-07-17
申请号：US11400
申请日：1987-02-04
申请人： Charles K. Asawa , Shi-Kay Yao , John D. Anderson
发明人： Charles K. Asawa , Shi-Kay Yao , John D. Anderson
IPC分类号： G02B6/14 , G02B6/24 , G02B6/34 , G02B6/44 , G08B13/12 , H04B10/12
CPC分类号： H04B10/85 , G02B6/24 , G02B6/264 , G02B6/32 , G02B6/4469 , G08B13/186 , G02B6/14
摘要： Apparatus and a corresponding method for launching two light beams into an optical fiber as two separate modal groups, and for separating light emanating from a fiber into two modal groups. The apparatus includes first and second lenses and a spatial modal filter in the form of a reflective disc disposed coaxially between the two lenses. When the apparatus is used as a launching device, the first lens operates to collimate light from a source of light modulated by a data signal and intended for launching as lower-order modes. The lower-order-mode light is reflected from the filter and focused by the first lens into an output fiber. The second lens collimates light from a source of light indicative of a monitor signal to be transmitted in the form of higher-order modes. This light is partially blocked by the spatial modal filter, then focused into the output fiber by the first lens. The fiber constrains this light to enter the output fiber at angles of incidence greater than some predetermined threshold angle. When the apparatus is used as a modal separator, the first lens collimates light from an input fiber, and the modal filter reflects only the light corresponding to the lower-order modes, allowing the higher-order modes to pass into the second lens and be focused into an output fiber. The reflected lower-order modes are focused by the first lens into another output fiber.
摘要翻译：用于将两个光束作为两个单独的模式组发射到光纤中并用于将从光纤发出的光分离成两个模态组的装置和相应的方法。该装置包括第一和第二透镜以及同轴地设置在两个透镜之间的反射盘形式的空间模态滤光器。当该装置用作发射装置时，第一透镜操作以准直来自由数据信号调制的光的光，并且用于作为低阶模式发射。低阶模式光从滤光器反射并被第一透镜聚焦成输出光纤。第二透镜使来自指示要以高阶模式的形式发送的监视信号的光源的光准直。该光被空间模态滤波器部分阻挡，然后通过第一透镜聚焦到输出光纤中。纤维约束该光以入射角大于某一预定阈值角度进入输出光纤。当该装置用作模态分离器时，第一透镜对来自输入光纤的光进行准直，并且模态滤波器仅反射与较低阶模式对应的光，允许高阶模式进入第二透镜，并且专注于输出光纤。反射的低阶模式被第一透镜聚焦到另一个输出光纤中。

6. 发明授权

US06185346B2 Propagation in lowest order modes of multimode graded index fiber, resulting in: very low transmission loss, low modal noise, high data security, and high data rate capabilities 失效
标题翻译：在多模渐变折射率光纤的最低阶模式下传播，导致：传输损耗非常低，模态噪声低，数据安全性高，数据速率高
公开(公告)号：US06185346B2
公开(公告)日：2001-02-06
申请号：US09205436
申请日：1998-12-04
申请人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
发明人： Charles K. Asawa , Jane K. Asawa , Mike H. Asawa
IPC分类号： G02B626
CPC分类号： H04B10/2581 , G02B6/14 , G02B6/262 , G02B6/30
摘要： This invention relates to optical fiber communication systems where data light is launched into a very small set of the lowest order propagation modes of multimode graded-index fibers, resulting in very high data rate transmission capability. We have determined, experimentally and theoretically, that light launched into a small set of a few lowest order propagation modes, or launched only into the fundamental propagation mode of multimode graded-index fiber, converts into and within a limited small set of lowest order modes due to severe bending perturbations that may occur in deployed multimode graded-index fiber transmission cable. Low modal time dispersion of the limited small set of lowest order modes is much less than when all modes of the multimode graded-index fiber are launched, yielding a much higher data rate transmission capability. Added advantages are: low transmission loss, low modal noise, and data security. Methods for launching the small set of lowest order propagation modes or the fundamental propagation modes into a single multimode graded-index fiber or into a plurality of multimode fibers in other optical fiber communication networks are described.
摘要翻译：本发明涉及光纤通信系统，其中将数据光发射到多模渐变折射率光纤的最低阶传播模式的非常小的集合中，导致非常高的数据速率传输能力。我们已经在实验和理论上确定了将光发射到一小组最低阶传播模式中，或仅发射到多模渐变折射率光纤的基本传播模式，转换成有限的一小组最低阶模式由于在部署的多模分级折射率光纤传输电缆中可能发生严重的弯曲扰动。有限小组最低阶模式的低模态时间色散远小于多模式渐变折射率光纤的所有模式启动时产生高得多的数据传输能力。增加的优点是：低传输损耗，低模态噪声和数据安全性。描述了将小组最低阶传播模式或基本传播模式发射到单个多模渐变折射率光纤或其它光纤通信网络中的多个多模光纤中的方法。

7. 发明授权

US5712937A Optical waveguide including singlemode waveguide channels coupled to a multimode fiber 失效
公开(公告)号：US5712937A
公开(公告)日：1998-01-27
申请号：US347947
申请日：1994-12-01
申请人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa , Michi Asawa
发明人： Charles K. Asawa , Mike H. Asawa , Jane K. Asawa , Michi Asawa
IPC分类号： G02B6/12 , G02B6/125 , G02B6/14 , G02B6/30 , H04B10/2581 , G02B6/28
CPC分类号： H04B10/2581 , G02B6/12007 , G02B6/125 , G02B6/14 , G02B6/30
摘要： An intrusion-alarmed optical fiber communication system, where light from two or more sources are launched with a planar channel waveguide launcher into two or more modes of a multimode graded-index transmission fiber, is disclosed. Input fibers containing the source light waves and the output fibers are in direct contact with the waveguide channels. Waveguide channels redistribute the light from input channels to output channels by rerouting, crossing, merging, or splitting channels. Waveguide launcher precisely launches data light into the fundamental mode and intrusion monitor light into high order modes of a multimode graded-index fiber. Fiber intrusion attenuates light in high order modes, but much less of the data in the fundamental mode, thereby forming a basis for the intrusion-alarmed system. Waveguide launcher permits light from a plurality of sources to be launched selectively into several types of fibers: singlemode fibers, multimode fibers, multicore fibers, multimode fibers having high refractive-index ring profile within the fiber core boundary. Waveguide channel configuration permit other versatile functions to be performed; these include optical time domain reflectometry, channel feedback stabilization of the diodes, launching light from more than one light source into the fundamental mode of a multimode graded-index fiber, and other functions. Means for launching and propagating the fundamental mode in multimode graded-index fiber in order to increase bandwidth capacity of said fiber are disclosed. Optical-electronic intrusion-alarmed systems with synchronous phase sensitive detection of intrusion are described, including reference recovery means. In order to decrease false alarm rates, information on transmitter light source variations are transmitted to the receiver via digital bit stream. A precise fiber optic sensor system based on the waveguide launcher is disclosed.

8. 发明授权

US4087689A Boresighting system for infrared optical receiver and transmitter 失效
标题翻译：红外光接收机和发射机的视觉系统
公开(公告)号：US4087689A
公开(公告)日：1978-05-02
申请号：US744071
申请日：1976-11-22
申请人： Charles K. Asawa
发明人： Charles K. Asawa
IPC分类号： G02B13/14 , G02B23/12 , G02B23/24 , H01J31/49
CPC分类号： G02B13/14 , G02B23/12 , G02B23/2461
摘要： Accurate pointing of an infrared receiver or transmitter is provided by boresighting using a special beamsplitter and visible spectrum transmitting optics. The beamsplitter reflects the infrared signal and transmits visible light which permits sighting through the receiver field optics for accurate boresighting or pointing.
摘要翻译：通过使用特殊的分光器和可见光谱发射光学器的光轴提供红外接收器或发射器的精确指向。分束器反射红外信号并透射可见光，其允许通过接收器场光学器件瞄准以准确地瞄准或指向。

9. 发明授权

US4817205A Bimodal optical fiber communication system using graded index fiber 失效
标题翻译：双峰光纤通信系统采用分级折射率光纤
公开(公告)号：US4817205A
公开(公告)日：1989-03-28
申请号：US847792
申请日：1986-04-03
申请人： Charles K. Asawa
发明人： Charles K. Asawa
IPC分类号： G02B6/14 , G02B6/26 , H04B10/2581 , G02B5/14
CPC分类号： H04B10/2581 , G02B6/14 , G02B6/262
摘要： An optical communication system in which at least two separate modal groups are launched into a single graded index transmission fiber. The system includes two light sources and a lens to focus the light sources into the transmission fiber. A spatial filter is used to selectively limit the angles of incidence of the light on the fiber, and operates in conjunction with the lens to launch light from one source at appropriate angles and points of excitation to excite higher-order modes in the fiber, and to launch light from the other source at appropriate angles and points of excitation to excite lower-order modes in the fiber.
摘要翻译：一种光通信系统，其中至少两个单独的模式组被发射到单个分级索引传输光纤中。该系统包括两个光源和用于将光源聚焦到传输光纤中的透镜。使用空间滤波器来选择性地限制光纤在光纤上的入射角，并且与透镜一起工作，以适当的角度和激发点从一个光源发射光以激发光纤中的高阶模，以及以适当的角度和激发点从另一个源发射光，以激发光纤中的低阶模式。

10. 发明授权

US4214165A Pyroelectric IR detector with signal capacitively coupled to an output circuit 失效
标题翻译：具有与输出电路电容耦合的信号的热释电IR检测器
公开(公告)号：US4214165A
公开(公告)日：1980-07-22
申请号：US13705
申请日：1979-02-21
申请人： Charles K. Asawa
发明人： Charles K. Asawa
IPC分类号： G01J5/34 , H01L37/02 , G01J1/00
CPC分类号： H01L37/02 , G01J5/34
摘要： The specification describes a novel pyroelectric detector in which one input detector electrode is mounted directly on one surface of a pyroelectric substrate and is used for absorbing chopped incoming infrared radiation. The output detector electrodes are capacitively coupled to the reverse substrate surface and provide an AC coupled output signal with a minimum of conductive heat transfer from the pyroelectric substrate.
摘要翻译：本说明书描述了一种新型热释电检测器，其中一个输入检测器电极直接安装在热电基片的一个表面上，并用于吸收切碎的入射红外辐射。输出检测器电极电容耦合到反向衬底表面，并且提供具有来自热电衬底的最小导电热传递的AC耦合输出信号。

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