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11. 发明授权

US5880824A Optical fiber strain measuring apparatus 失效
标题翻译：光纤应变测量仪
公开(公告)号：US5880824A
公开(公告)日：1999-03-09
申请号：US924325
申请日：1997-09-05
申请人： Haruyoshi Uchiyama , Zhixien Li , Yasushi Satoh , Toshio Kurashima
发明人： Haruyoshi Uchiyama , Zhixien Li , Yasushi Satoh , Toshio Kurashima
IPC分类号： G01M11/00 , G01D5/353 , G01L1/24 , G01M11/02 , G01N21/00
CPC分类号： G01L1/242 , G01D5/344 , G01D5/35358
摘要： An object of the present invention is to provide an optical fiber strain measuring apparatus which can perform precise measurement without causing any fluctuation in signal level. To achieve the above object the present invention comprises: a polarization plane rotation device 105 which rotates a plane of polarization of an optical pulse; a photo-directional coupler 106 which projects an optical pulse projected from the polarization plane rotation device 105 into an optical fiber 107 to be measured, and projects out backscattering light produced in the optical fiber 107 to be measured; a polarization plane rotation device 160 which rotates a plane of polarization of a reference light; a light mixing device 109 for mixing the backscattering light projected out from the photo-directional coupler 106 and the reference light projected from the polarization plane rotation device 160; and a signal processing section 111 which detects the mixed light projected from the light mixing device 109, converts the detected light into an electrical signal and subjects the electrical signal to a predetermined operational processing to obtain a measurement waveform.
摘要翻译：本发明的目的是提供一种可以进行精确测量而不引起信号电平波动的光纤应变测量装置。为了实现上述目的，本发明包括：使光脉冲的偏振平面旋转的偏振面旋转装置105; 将从偏振面旋转装置105投射的光脉冲投射到被测光纤107的光定向耦合器106，投射出待测光纤107中产生的后向散射光; 旋转参考光的偏振平面的偏振面旋转装置160; 用于混合从光定向耦合器106射出的后向散射光和从偏振面旋转装置160投影的参考光的光混合装置109; 以及信号处理部111，其检测从光混合装置109射出的混合光，将检测出的光转换为电信号，并对电信号进行预定的运算处理，得到测定波形。

12. 发明授权

US5880463A Optical fiber strain-measuring apparatus 失效
标题翻译：光纤应变测量仪
公开(公告)号：US5880463A
公开(公告)日：1999-03-09
申请号：US954799
申请日：1997-10-21
申请人： Haruyoshi Uchiyama
发明人： Haruyoshi Uchiyama
IPC分类号： G01M11/00 , G01B11/00 , G01B11/16 , G01D5/353 , G01L1/24 , G01M11/02 , G01J1/04
CPC分类号： G01M11/39 , G01B11/18 , G01D5/35364 , G01L1/242
摘要： The objective of the present invention is to offer an optical fiber strain-measuring apparatus, which allows the detecting of the amount of strain at an arbitrary distance within a test optical fiber as well as the distance strain distribution, and facilitates the detecting of the back scattered light. In order to achieve the above objective, the present invention comprises an acousto-optic switch 108 which outputs a measuring pulse light, an optical circulator 112 which forwards the measuring pulse light to an optical ring circuit possessing a test optical fiber 124, while allowing the natural Brillouin back scattered light generated from the test optical fiber 124 to travel through the optical ring circuit, a frequency conversion section 132 to successively convert the reference light outputted from an optical directional coupler 102 into a reference pulse train which has its frequency change into a step form, and an acousto-optic switch 134 to output the reference pulse train as a sampling pulse, and the sampling pulse and the natural Brillouin back scattered light outputted from the optical ring circuit are converted into electrical signals by the opto-electric conversion section 138, and the signal processing section 146 measures the strain of the test optical fiber 124 based on these electrical signals.
摘要翻译：本发明的目的是提供一种光纤应变测量装置，其能够检测测试光纤内的任意距离处的应变量以及距离应变分布，并且便于检测背面散光为了实现上述目的，本发明包括输出测量脉冲光的声光开关108，将测量脉冲光转发到具有测试光纤124的光环电路的光环行器112，同时允许从测试光纤124产生的自然布里渊背散射光穿过光环电路，频率转换部分132将从光学定向耦合器102输出的参考光连续地转换成具有频率变化的参考脉冲串步进形式和声光开关134，以输出参考脉冲串作为采样脉冲，并且从光环电路输出的采样脉冲和自然布里渊背散射光被光电转换部分转换成电信号 138，信号处理部146基于测量光纤124的应变这些电信号。

13. 发明授权

US5821426A Optical fiber strain measuring apparatus 失效
标题翻译：光纤应变测量仪
公开(公告)号：US5821426A
公开(公告)日：1998-10-13
申请号：US926577
申请日：1997-09-04
申请人： Haruyoshi Uchiyama
发明人： Haruyoshi Uchiyama
IPC分类号： G01M11/00 , G01B11/00 , G01B11/16 , G01D5/353 , G01L1/24 , G01M11/02
CPC分类号： G01M11/39 , G01D5/35364 , G01L1/242
摘要： The objective of the present invention is to offer an optical fiber strain-measuring apparatus, which allows the measurement of the strain at an arbitrary position within an optical fiber. An optical frequency conversion section 3 shifts, in a step-wise manner for prescribed frequencies, the frequencies of a continuous light emitted from a light source 1. A sound-light switch 4 coverts into pulses the continuous light forwarded from the optical frequency conversion section 3. When those light pulses are entered into a test optical fiber, back-scattered light is generated. An optical directional coupler 11 branches and forwards to an optical ring circuit and to an optical directional coupler 13 the back-scattered light. A photo-electric converter 14 receives employing heterodyne detection and converts into electric signals the synthesized light signals of the back-scattered light forwarded from the optical directional coupler 11 and the continuous light forwarded from the optical directional coupler 2. A signal processing section 18 reads at an arbitrary timing the electric signals, performs necessary processes, and obtains the amount of strain of the test optical fiber 7.
摘要翻译：本发明的目的是提供一种光纤应变测量装置，其允许测量光纤内的任意位置处的应变。光频变换部分3以规定频率逐步地移动从光源1发射的连续光的频率。声光开关4将从光频变换部分转发的连续光遮盖成脉冲，当这些光脉冲进入测试光纤时，产生背散射光。光学定向耦合器11向光环路电路和光定向耦合器13分支并向前散射光。光电转换器14接收采用外差检测，并将从光学定向耦合器11转发的反向散射光的合成光信号和从光学定向耦合器2转发的连续光转换成电信号。信号处理部分18读取在任意定时，电信号执行必要的处理，并获得测试光纤7的应变量。

14. 发明授权

US5781322A Method and apparatus for measuring the noise figure of an optical amplifier 失效
标题翻译：用于测量光放大器噪声系数的方法和装置
公开(公告)号：US5781322A
公开(公告)日：1998-07-14
申请号：US696074
申请日：1996-08-13
申请人： Haruyoshi Uchiyama , Zhixien Li , Kazuo Aida
发明人： Haruyoshi Uchiyama , Zhixien Li , Kazuo Aida
IPC分类号： G01M11/00 , G01J11/00 , H04B10/00
CPC分类号： G01J11/00
摘要： An optical pulse signal produced by modulating a continuous laser light by means of a first pulse having a period sufficiently shorter than the atomic lifetime in the upper energy state of a rare earth doped fiber is input to an optical amplifier to be measured, while an output signal from the optical amplifier is modulated by a second pulse synchronized with the first pulse and having a phase difference relative to the first pulse which can be optionally set so that rapid phase adjustment relative to the first pulse is possible based on the phase at the time of minimum optical power. The noise figure of the optical amplifier is then measured based on, the maximum photoelectric power (P.sub.AMP +P.sub.ASE) and the minimum photoelectric power P.sub.ASE of the resultant optical signal.
摘要翻译：通过在稀土掺杂光纤的上能量状态下通过具有比原子寿命充分短的时间的第一脉冲调制连续激光而产生的光脉冲信号被输入到待测量的光放大器，而输出来自光放大器的信号由与第一脉冲同步的第二脉冲调制，并具有相对于第一脉冲的相位差，该第一脉冲可以可选地被设置为使得可以基于当时的相位相对于第一脉冲进行快速相位调整的最小光功率。然后，基于最终的光信号的最大光电功率（PAMP + PASE）和最小光电功率PASE来测量光放大器的噪声系数。

15. 发明授权

US5581389A Light frequency control apparatus 失效
标题翻译：光频控制装置
公开(公告)号：US5581389A
公开(公告)日：1996-12-03
申请号：US364204
申请日：1994-12-27
申请人： Tekken Lee , Nobunari Takeuchi , Haruyoshi Uchiyama , Kaoru Shimizu , Tsuneo Horiguchi , Yahei Koyamada
发明人： Tekken Lee , Nobunari Takeuchi , Haruyoshi Uchiyama , Kaoru Shimizu , Tsuneo Horiguchi , Yahei Koyamada
IPC分类号： G02F2/02 , H01S3/10 , H01S3/13 , H04B10/00 , H04J14/06
CPC分类号： H04B10/2572 , H01S3/1301 , H01S3/10
摘要： The present invention provides light frequency control apparatus comprising a light pulse signal generating mechanism for generating a light pulse signal of a standard frequency; a light frequency shifting mechanism for circulating this light pulse signal a predetermined number of times, delaying this light pulse signal at each cycle thereby sequentially shifting and outputting the aforementioned light pulse signal; an extracting mechanism for extracting a light pulse signal in the second half of a cycle from the output of the light frequency shifting mechanism; and a polarization control mechanism inserted into the light frequency shifting mechanism for controlling the angle of polarization of the light pulse signal circulating in the light frequency shifting mechanism based on the amount of attenuation of the light pulse signal outputted by the extracting mechanism.
摘要翻译：本发明提供一种光频控制装置，其包括用于产生标准频率的光脉冲信号的光脉冲信号发生机构; 用于使该光脉冲信号循环预定次数的光频移位机构，在每个周期延迟该光脉冲信号，从而依次移位并输出上述光脉冲信号; 提取机构，用于从光频移位机构的输出端提取周期的后半部分的光脉冲信号; 以及偏振控制机构，其插入到所述光频移动机构中，用于基于由所述提取机构输出的所述光脉冲信号的衰减量来控制在所述光频移动机构中循环的所述光脉冲信号的偏振角。

16. 发明授权

US5561551A Method and apparatus for determining noise factor of optical amplifier 失效
标题翻译：用于确定光放大器噪声系数的方法和装置
公开(公告)号：US5561551A
公开(公告)日：1996-10-01
申请号：US542737
申请日：1995-10-13
申请人： Takashi Iwasaki , Haruyoshi Uchiyama , Kazuo Aida , Yoshiaki Sato
发明人： Takashi Iwasaki , Haruyoshi Uchiyama , Kazuo Aida , Yoshiaki Sato
IPC分类号： G01M11/00 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/10 , H01S3/17 , H04B10/02
CPC分类号： H04B10/0731 , H01S3/06754 , H04B10/07 , H01S2301/02
摘要： A simple, quick and precise method for determining a noise factor of an optical amplifier system is presented and demonstrated with an apparatus based on rare-earth doped optical fibers. The method is based on rapid adjustments of the phase differentials between the input optical signals into and the output optical signals from the optical amplifier to compensate for system variables including the optical fiber lengths within the apparatus as well as in the ancillary devices. A cw laser source is modulated with a first pulse having a significantly shorter cycle than a lifetime of excited atoms within the doped fiber, and the modulated pulses are continually applied to the noise determining apparatus. The optical output signal from the apparatus is synchronized with the first pulse and the optical output signal is further modulated with a series of second pulses having increasing phase differentials in relation to the first pulse. The electrical output power from the noise determining apparatus undergoes a maximum and a minimum values, and the noise factor of the apparatus is calculated by using the values of the respective maximum and the minimum electrical output power.
摘要翻译：介绍了一种用于确定光放大器系统的噪声系数的简单，快速和精确的方法，并用基于稀土掺杂光纤的设备进行了演示。该方法基于输入光信号之间的相位差的快速调整和来自光放大器的输出光信号的补偿，以补偿包括装置内和辅助装置中的光纤长度的系统变量。 cw激光源通过第一脉冲进行调制，该第一脉冲具有比掺杂光纤内的激发原子的寿命显着更短的周期，并且调制脉冲被连续施加到噪声确定装置。来自装置的光输出信号与第一脉冲同步，并且光输出信号通过相对于第一脉冲具有增加的相位差的一系列第二脉冲进一步调制。来自噪声判定装置的电力输出功率经历最大值和最小值，并且通过使用相应的最大和最小电力输出功率的值来计算装置的噪声系数。

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