-
1.发明授权Sensor array and method of selective interferometric sensing by use of coherence synthesis 失效通过使用相干合成的传感器阵列和选择性干涉测量方法
公开(公告)号：US4818064A
公开(公告)日：1989-04-04
申请号：US100483
申请日：1987-09-24
CPC分类号： G01H9/004 , G01D5/35383 , Y10S359/90
摘要： A sensor array and method for remotely monitoring environmental effects on a selected sensor. In a sensor array comprising a plurality of interferometers, an optical signal of a selected configuration is provided so that portions of the optical signal are propagated through the interferometers. The optical signal configuration causes optical signal portions which have traveled the same signal path, except where separated on signal paths in a selected interferometer, to coherently mix when combined at an output of the selected interferometer. No other optical signal portions in the sensor array will coherently mix. The optical signal comprises plural components such as side bands which are configured to form a power spectrum defining an optical signal coherence function having a maximum which repeats periodically at a rate substantially corresponding to optical signal travel time difference in the selected interferometer. Also, the coherence function has minimums or zero values at times such that intervals between various minimums substantially correspond to optical signal travel time differences through non-selected interferometers, thus precluding coherent mixing of optical signal portions emerging from those non-selected interferometers. By modifying characteristics of the optical signal components, one may change the repetition period of the coherence function maximum and of selected coherence function minimums to produce coherent mixing of signal portions from another interferometer while precluding coherent mixing of signals from all other interferometers, including the previously selected interferometer. Accordingly, a given sensor may be selected from monitoring, to the exclusion of all others.
摘要翻译： 用于远程监测所选传感器的环境影响的传感器阵列和方法。 在包括多个干涉仪的传感器阵列中，提供所选配置的光信号，使得光信号的部分通过干涉仪传播。 光信号配置导致已经行进相同信号路径的光信号部分，除了在所选择的干涉仪中的信号路径上分离的情况下，当在所选择的干涉仪的输出处被组合时相干混合。 传感器阵列中没有其他光信号部分将相干混合。 光信号包括诸如边带的多个组件，其被配置为形成定义具有最大值的光信号相干函数的功率谱，该最大值以基本上对应于所选干涉仪中的光信号行进时间差的速率周期性地重复。 此外，相干函数在时间上具有最小值或零值，使得各种最小值之间的间隔基本上对应于通过未选择的干涉仪的光信号行进时间差，从而排除从那些未选择的干涉仪出现的光信号部分的相干混合。 通过修改光信号分量的特性，可以改变相干函数最大值和所选相干函数最小值的重复周期，以产生来自另一干涉仪的信号部分的相干混合，同时排除来自所有其它干涉仪的信号的相干混合，包括先前 选择干涉仪。 因此，可以选择给定的传感器来监视所有其他传感器。
-
公开(公告)号：US4770535A
公开(公告)日：1988-09-13
申请号：US877296
申请日：1986-06-23
CPC分类号： G01D5/35383
摘要： A distributed sensor system using pulsed optical signals optionally produced by a short coherence length source to provide a phase difference output signal representative of conditions affecting a selected sensor. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light pulses transmitted through the sensors are multiplexed onto a return arm of the ladder. The multiplexed signals are received by an optical fiber compensating interferometer which coherently couples portions of adjacent multiplexed light signals to produce a phase difference signal representing conditions influencing selected sensors. In other preferred embodiments, the system is configured to define a plurality of adjacent Mach-Zehnder interferometers which provide output signal pairs which coherently couple to yield a phase difference signal directly representing the environmental effects on a particular sensor. Functional equivalents of the Mach-Zehnder interferometer configurations comprise configurations including adjacent Michelson interferometers. A phase and amplitude modulation technique is disclosed for providing heterodyned output signals from the distributed sensor system.
摘要翻译： 使用脉冲光信号的分布式传感器系统，其可选地由短相干长度源产生，以提供表示影响所选传感器的条件的相位差输出信号。 在一个优选实施例中，光纤传感器阵列以梯形结构组织，传感器以间隔关系定位并限定梯子的梯级。 通过传感器传输的光脉冲被复用到梯子的返回臂上。 复用的信号由光纤补偿干涉仪接收，该干涉仪相干地耦合相邻复用光信号的部分，以产生表示影响所选传感器的条件的相位差信号。 在其它优选实施例中，该系统被配置为限定多个相邻的马赫 - 曾德尔干涉仪，其提供相干耦合以产生直接表示对特定传感器的环境影响的相位差信号的输出信号对。 Mach-Zehnder干涉仪配置的功能等同物包括相邻的迈克尔逊干涉仪。 公开了一种用于从分布式传感器系统提供外差输出信号的相位和幅度调制技术。
-
3.发明授权
公开(公告)号：US4697926A
公开(公告)日：1987-10-06
申请号：US699855
申请日：1985-02-08
申请人： Robert C. Youngquist , Janet L. Brooks , Kenneth A. Fesler , Cassius C. Cutler , Herbert J. Shaw
发明人： Robert C. Youngquist , Janet L. Brooks , Kenneth A. Fesler , Cassius C. Cutler , Herbert J. Shaw
CPC分类号： G01D5/35383
摘要： A distributed sensor system including an optical source having a short coherence length for optionally continuously monitoring each sensor in the system. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light transmitted through the sensors is multiplexed onto a return arm of the ladder, with sensor spacing being such that interference between light from different sensors is prevented. The multiplexed signals are received by an optical fiber receiver which couples the multiplexed light with an interfering optical reference signal to produce a phase difference signal representing conditions influencing selected sensors. Embodiments are disclosed for use of either pulsed or continuous wave light sources. In another preferred embodiment, the sensors comprise a plurality of Mach-Zehnder interferometers connected in series configuration by a common optical fiber, which provides multiplexed output signals from the sensors to a plurality of Mach-Zehnder interferometers comprising receivers. The optical path length differences between the arms of each of the sensors are selected to prevent interference between the multiplexed sensor output signals from various sensors. The optical path lengths through the sensors and receivers are structured so that each receiver produces a phase difference signal relating to conditions affecting light transmission through a specific sensor. A phase and amplitude modulation technique is disclosed for providing heterodyned output signals from the distributed sensor system.
摘要翻译： 一种分布式传感器系统，包括具有短相干长度的光源，用于可选地连续监测系统中的每个传感器。 在一个优选实施例中，光纤传感器阵列以梯形结构组织，传感器以间隔关系定位并限定梯子的梯级。 通过传感器传输的光被多路复用到梯子的返回臂上，传感器间隔使得防止来自不同传感器的光之间的干扰。 复用的信号由光纤接收器接收，光纤接收器将复用的光与干涉光参考信号耦合，以产生表示影响所选传感器的条件的相位差信号。 公开了使用脉冲或连续波光源的实施例。 在另一个优选实施例中，传感器包括通过公共光纤串联配置的多个马赫 - 曾德干涉仪，其将来自传感器的多路复用输出信号提供给包括接收器的多个马赫 - 曾德干涉仪。 选择每个传感器的臂之间的光程长度差以防止来自各种传感器的多路传感器输出信号之间的干扰。 通过传感器和接收器的光路长度被构造成使得每个接收器产生与影响通过特定传感器的光透射的条件相关的相位差信号。 公开了一种用于从分布式传感器系统提供外差输出信号的相位和幅度调制技术。
-
公开(公告)号：US06535145B1
公开(公告)日：2003-03-18
申请号：US08548441
申请日：1995-10-26
IPC分类号： H03M1100
摘要： Ideographic keyboard and method in which an array of characters are printed on one side of a panel and optically readable data corresponding to the characters is recorded on the other side of the panel. A character selector is moved about the first side the panel for selective alignment with the characters, and an optical reader is linked to the character selector for movement about the recorded data in concert with the character selector. The data corresponding to a selected character is read, and a coded signal for the selected character is output in response to the data which is read. In one disclosed embodiment, the data is recorded in the form of bar coding, and the reader is a bar code reader. Precise alignment of the reader with the data for the selected character is assured by reading data from a region larger than the data field itself and extracting the character data in software.
摘要翻译： 在面板的一侧印刷字符阵列的表意键盘和方法，并且与面板对应的光学可读数据被记录在面板的另一侧。 字符选择器围绕面板的第一侧移动以与字符选择性对准，并且光学读取器被链接到字符选择器以便与字符选择器一致地关于所记录的数据移动。 读取对应于所选字符的数据，并响应于读取的数据输出所选字符的编码信号。 在一个公开的实施例中，以条形码的形式记录数据，读取器是条形码阅读器。 通过从大于数据字段本身的区域读取数据并且以软件提取字符数据来确保读取器与所选字符的数据的精确对准。
-
5.发明授权Emergency alert communication system wherein emergency messages are received by a radio frequency receiver and routed to a telephone device 失效紧急警报通信系统，其中紧急消息由射频接收机接收并被路由到电话设备
公开(公告)号：US5917887A
公开(公告)日：1999-06-29
申请号：US925253
申请日：1997-09-08
申请人： Kenneth A. Fesler , Carl Goy
发明人： Kenneth A. Fesler , Carl Goy
CPC分类号： G08B25/08 , G08B25/016 , H04M11/045
摘要： An emergency alert communication system comprising a radio frequency receiver. The radio frequency receiver decodes incoming emergency alert signals and demodulates data header signals and emergency alert voice message signals of the emergency alert signals. Included in the data header signals are event and location code signals, which are followed by the emergency alert voice message signals. The demodulated data header signals in the form of digital data header signals are applied to a microcontroller. A telephone keypad of a telephone device is actuated to enter into the microcontroller event and location code signals. Should the event and location code signals demodulated by the receiver and applied to the microcontroller match the event and location code signals entered into the microcontroller by the telephone keypad, the microcontroller routes through an audio switching circuit the emergency alert voice message signals to a speaker, a recording device and a telephone handset of a telephone device. The radio frequency receiver, the microcontroller, the telephone handset, the telephone keypad, the speaker, and the recording device are embodied in the telephone device.
摘要翻译： 一种包括射频接收机的紧急警报通信系统。 射频接收机解码进入的紧急警报信号，解调紧急警报信号的数据头信号和紧急警报语音信息信号。 包括在数据头信号中的是事件和位置码信号，紧随其后的紧急警报语音信息信号。 数字数据头信号形式的解调数据头信号被施加到微控制器。 电话设备的电话键盘被致动以进入微控制器事件和位置码信号。 如果由接收机解调并应用于微控制器的事件和位置代码信号与通过电话键盘输入到微控制器的事件和位置代码信号相匹配，则微控制器通过音频切换电路将紧急警报语音消息信号路由到扬声器， 电话设备的记录设备和电话听筒。 无线电频率接收机，微控制器，电话听筒，电话键盘，扬声器和记录装置体现在电话装置中。
-
公开(公告)号：US5108183A
公开(公告)日：1992-04-28
申请号：US565248
申请日：1990-08-09
CPC分类号： G01C19/721 , G01P3/36
摘要： An improved broadband light source for a Sagnac interferometer includes a waveguide, such as a fluorescent optical fiber, that is pumped by a pump source with a sufficient intensity to generate temporally incoherent light. The fluorescent optical fiber has first and second ends, one end being an input end of the fiber. The broadband light is provided at an output of the fluorescent optical fiber and is input to the interferometer. In order to prevent laser oscillations between the light source and the interferometer, one end of the fluorescent optical fiber is formed so as to prevent reflections. The light output from the fluorescent fiber to the interferometer comprises only that light that initially propagates toward the output of the optical fiber. In one embodiment of the light source, the pump light from the pump source is coupled into the fluorescent optical fiber in a direction so that it travels away from the output of the fluorescent optical fiber towards the first end. In an alternative embodiment, the fluorescent optical fiber is a doubly clad optical fiber having a first acceptance region and a second acceptance region at the first end. The pump light is introduced into an aperture window between the two acceptance regions so that the pump light can be introduced into the first end at an angle without requiring a reflective surface at the first end.
摘要翻译： 用于Sagnac干涉仪的改进的宽带光源包括诸如荧光光纤的波导，其由泵浦源以足够的强度泵浦以产生时间上不相干的光。 荧光光纤具有第一和第二端，一端是光纤的输入端。 宽带光被提供在荧光光纤的输出处，并被输入到干涉仪。 为了防止光源和干涉仪之间的激光振荡，形成荧光光纤的一端以防止反射。 从荧光纤维到干涉仪的光输出仅包括最初向光纤的输出传播的光。 在光源的一个实施例中，来自泵浦源的泵浦光沿着使得其从荧光光纤的输出朝着第一端行进的方向耦合到荧光光纤中。 在替代实施例中，荧光光纤是在第一端具有第一接收区和第二接收区的双包层光纤。 泵浦光被引入两个接受区域之间的孔眼窗口中，使得泵浦光可以一角度被引入第一端，而不需要第一端的反射表面。
-
公开(公告)号：US5106193A
公开(公告)日：1992-04-21
申请号：US565255
申请日：1990-08-09
CPC分类号： G01B9/0209 , G01B9/0201 , G01C19/64 , G01B2290/70
摘要： An improved broadband light source for a Sagnac interferometer includes a fluorescent optical medium that is pumped by light from a pump source with a sufficient intensity to cause the fluorescent optical medium to generate temporally incoherent light by superfluorescence. In the preferred embodiment, the superfluorescent optical medium comprises an optical fiber which is backward pumped. The signal output from the interferometer loop is amplified by the optical gain of the superfluorescent fiber which acts as a light source and as an amplifier. In order to avoid gain modulation in the superflorescent fiber, the modulation frequency is selected so that the modulation gain depth is substantially reduced.
-
8.发明授权Interferometric technique for measurement of nonreciprocal optical effects in a sample 失效用于测量样品中非互易光学效应的干涉测量技术
公开(公告)号：US5235404A
公开(公告)日：1993-08-10
申请号：US722338
申请日：1991-06-27
CPC分类号： G01N21/21 , G02B21/002 , G01J2009/0261 , G01J2009/0273 , G01N2021/216 , G01N2021/218
摘要： A method and apparatus for measuring nonreciprocal optical effects contemplates directing two circularly polarized optical beams having a known phase relation to each other at a sample, and detecting the difference in phase between the two beams after they have encountered the sample. In a transmission measurement the two circularly polarized beams have the same handedness, but pass through the sample in opposite directions. In a reflection measurement, the two circularly polarized beams have opposite handedness, but encounter the sample in the same direction. In a particular embodiment of the invention a linearly polarized beam is introduced into a Sagnac interferometer and split into two linearly polarized beams which are ultimately recombined.
摘要翻译： 用于测量不可逆光学效应的方法和装置预期在样本处引导具有彼此已知相位关系的两个圆偏振光束，并且在两个光束遇到样本之后检测两相之间的相位差。 在透射测量中，两个圆偏振光束具有相同的螺旋性，但是在相反方向穿过样品。 在反射测量中，两个圆偏振光束具有相反的手性，但是在相同方向上遇到样品。 在本发明的一个具体实施例中，线性偏振光束被引入到Sagnac干涉仪中，并被分成两个最终重组的线性偏振光束。
-
公开(公告)号：US4735484A
公开(公告)日：1988-04-05
申请号：US699666
申请日：1985-02-08
申请人： Kenneth A. Fesler
发明人： Kenneth A. Fesler
CPC分类号： G02F1/0134
摘要： A fiber optic frequency shifter comprises an optical fiber having an acoustic conducting medium for propagation of an acoustic signal. The acoustic medium is preferably shaped as a rod, and the acoustic signal propagates longitudinally down the rod. The optical fiber is wound around the rod with plural turns such that the axis of the fiber is at an angle relative to the wave fronts of the acoustic signal. As the acoustic signal propagates through the rod, it causes stress on the portions of the fiber in contact with the rod. The stress on the fiber caused by the acoustic wave causes optical energy to be transferred between two propagation mdes of the fiber. This transferred energy is shifted in frequency by the frequency of the acoustic signal. By tightly winding the turns of the fiber, high frequency shifts can be obtained. The invention is also advantageous in that it provides a large amount of acoustic contact between the acoustic wave fronts and the fiber over a relatively short acoustic propagation distance. Thus, the device is quite compact.
摘要翻译： 光纤移频器包括具有用于传播声信号的声传导介质的光纤。 声学介质优选地成形为杆，并且声信号沿杆向下传播。 光纤以多匝缠绕在杆上，使得光纤的轴线相对于声信号的波前成一定角度。 当声信号通过杆传播时，它会使纤维与棒接触的部分产生应力。 由声波引起的光纤上的应力导致光能在光纤的两个传播mdes之间传输。 该传输的能量以声频信号的频率在频率上移动。 通过紧紧缠绕光纤的匝数，可以获得高频移。 本发明的优点在于，它在相对较短的声传播距离内在声波前沿和光纤之间提供大量的声学接触。 因此，该装置相当紧凑。
-
10.发明授权公开(公告)号：US06891994B2
公开(公告)日：2005-05-10
申请号：US10274728
申请日：2002-10-21
CPC分类号： G02B6/29386 , G02B6/2817 , G02B6/2935 , G02B6/29398 , G02B27/144 , G02B27/145
摘要： A device includes a first fiber collimator, a second fiber collimator, a third fiber collimator, a first beam splitting prism, a second beam splitting prism, a spacer, a resonator cube, and a dielectric beam splitting coating. The dielectric beam splitting coating separates the second beam splitting prism from the resonator cube. The spacer and the first fiber collimator straddle the first beam splitting prism. The first beam splitting prism and the second beam splitting prism straddle the spacer. The second fiber collimator and the spacer straddle the second beam splitting prism. The third fiber collimator and the spacer straddle the second beam splitting prism.
摘要翻译： 一种器件包括第一光纤准直器，第二光纤准直器，第三光纤准直器，第一分束棱镜，第二分束棱镜，间隔物，谐振器立方体和介质光束分裂涂层。 介质分束涂层将第二分束棱镜与共振器立方体分开。 间隔件和第一光纤准直器跨越第一分束棱镜。 第一分束棱镜和第二分束棱镜跨越间隔件。 第二光纤准直仪和间隔物跨越第二分束棱镜。 第三光纤准直器和间隔物跨越第二分束棱镜。
-
-
-
-
-
-
-
-
-
搜索结果
12 条记录 (耗时 0.015 秒)
