专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4770535A Distributed sensor array and method using a pulsed signal source 失效
标题翻译：分布式传感器阵列和使用脉冲信号源的方法
公开(公告)号：US4770535A
公开(公告)日：1988-09-13
申请号：US877296
申请日：1986-06-23
申请人： Byoung Y. Kim , Moshe Tur , Janet L. Brooks , Kenneth A. Fesler , Herbert J. Shaw
发明人： Byoung Y. Kim , Moshe Tur , Janet L. Brooks , Kenneth A. Fesler , Herbert J. Shaw
IPC分类号： G01J1/02 , G01D5/353 , G01H9/00 , G01J9/02 , G01R15/24 , G08C23/04 , G01B9/02
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。

2. 发明授权

US4768880A System and method for accurate loop length determination in fiber-optic sensors and signal processors 失效
标题翻译：光纤传感器和信号处理器的精确环路长度确定的系统和方法
公开(公告)号：US4768880A
公开(公告)日：1988-09-06
申请号：US877321
申请日：1986-06-23
申请人： Moshe Tur , Byoung Y. Kim , Janet L. Brooks , Herbert J. Shaw
发明人： Moshe Tur , Byoung Y. Kim , Janet L. Brooks , Herbert J. Shaw
IPC分类号： G01D5/353 , G01B9/02
CPC分类号： G01D5/35303
摘要： A technique and system for accurate determination of differential propagation delays in fiber-optic circuits. The method includes providing a sinusoidally modulated optical signal to each of two waveguides defining optical paths. The optical signals received from the optical paths are combined to form a reference output signal which has a null waveform whenever the propagation delay between the optical signals contains an odd number of half periods of the optical signal waveforms. The difference in the sinusoidal modulation frequency producing a first and second null or constant waveform in the reference signal is determined. This difference value between adjacent frequencies forming the null or constant waveforms comprises the inverse of the difference of signal propagation delay in the two optical paths. Accuracy is improved by measuring the sinusoidal modulation frequencies corresponding to first and second waveforms which are not formed by adjacent frequencies. The difference between those nonadjacent frequencies is divided by the difference in the reference waveform orders of the null reference waveforms to obtain the inverse of the differential propagation delay. Further accuracy is achieved by measuring at least one of the waveform nulls at a high waveform order. Still further accuracy is achieved by monitoring the reference waveforms on a network analyzer and using a frequency synthesizer to more precisely match and identify the modulation frequencies corresponding to the null reference signal waveforms. A system is disclosed for implementing this technique optionally using optical sources having a short coherence length. Mathematical relationships are disclosed for use with measured values in obtaining further improved accuracy.
摘要翻译：一种用于精确确定光纤电路差分传播延迟的技术和系统。该方法包括向定义光路的两个波导中的每一个提供正弦调制光信号。每当光信号中的传播延迟包含光信号波形的奇数个半周期时，从光路接收的光信号被组合以形成具有零波形的参考输出信号。确定在参考信号中产生第一和第二无效或恒定波形的正弦调制频率的差异。形成零波形或恒定波形的相邻频率之间的差值包括两个光路中的信号传播延迟差的倒数。通过测量对应于不由相邻频率形成的第一和第二波形的正弦调制频率来提高精度。这些不相邻频率之间的差异除以空参考波形的参考波形次数的差异，以获得差分传播延迟的倒数。通过以高波形顺序测量至少一个波形零点来实现进一步的精度。通过监视网络分析仪上的参考波形并使用频率合成器更精确地匹配和识别与空参考信号波形相对应的调制频率，可以进一步提高精度。公开了一种用于实现该技术的系统，其可选地使用具有短相干长度的光源。公开了与测量值一起使用的数学关系，以获得进一步提高的准确度。

3. 发明授权

US4699513A Distributed sensor and method using coherence multiplexing of fiber-optic interferometric sensors 失效
标题翻译：分布式传感器和使用光纤干涉传感器相干多路复用的方法
公开(公告)号：US4699513A
公开(公告)日：1987-10-13
申请号：US738678
申请日：1985-05-28
申请人： Janet L. Brooks , Moshe Tur , Robert C. Youngquist , Byoung Y. Kim , Robert H. Wentworth , Herbert J. Shaw , Kjell Blotekjaer
发明人： Janet L. Brooks , Moshe Tur , Robert C. Youngquist , Byoung Y. Kim , Robert H. Wentworth , Herbert J. Shaw , Kjell Blotekjaer
IPC分类号： G01D21/00 , G01D5/26 , G01D5/353 , G01H7/00 , G01H9/00 , G01K11/00 , G01L1/00 , G01N21/00 , G01N21/17 , G02B6/00 , G02B6/14 , G02B6/28 , G08C15/00 , H04J14/00 , G01B9/02
CPC分类号： G01D5/35383 , G02B6/14 , G02B6/2821 , G02B6/2826 , G02B6/283 , G02B6/2843 , G02B6/2861 , H04J14/002
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 interferometers connected in series configuration by a common optical fiber, which provides multiplexed output signals from the sensors to another plurality of interferometers comprising receivers. Functional equivalents of the series configuration provide sensors and receivers comprising birefringent or two-mode fiber. The optical path length differences between each pair of sensor arms are selected to prevent interference between the multiplexed sensor output signals from the 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另外多个干涉仪。串联配置的功能等同物提供包括双折射或双模光纤的传感器和接收器。选择每对传感器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。

4. 发明授权

US4697926A Coherent distributed sensor and method using short coherence length sources 失效
标题翻译：相干分布传感器和使用短相干长度源的方法
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
IPC分类号： G01D21/00 , G01D5/353 , G01H9/00 , G02B6/00 , H04B10/00 , H04B10/20 , G01B9/02
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。

5. 发明授权

US5108183A Interferometer utilizing superfluorescent optical source 失效
标题翻译：干涉仪采用超荧光光源
公开(公告)号：US5108183A
公开(公告)日：1992-04-28
申请号：US565248
申请日：1990-08-09
申请人： John J. Fling , Byoung Y. Kim , Kenneth A. Fesler , Michel J. F. Digonnet , Herbert J. Shaw
发明人： John J. Fling , Byoung Y. Kim , Kenneth A. Fesler , Michel J. F. Digonnet , Herbert J. Shaw
IPC分类号： G01B9/02 , G01C19/72 , G01P3/36 , H01S3/06 , H01S3/07 , H01S3/10
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。

6. 发明授权

US5106193A Optical waveguide amplifier source gyroscope 失效
标题翻译：光波导放大器源光源
公开(公告)号：US5106193A
公开(公告)日：1992-04-21
申请号：US565255
申请日：1990-08-09
申请人： Kenneth A. Fesler , Michel J. F. Digonnet , Byoung Y. Kim , Herbert J. Shaw
发明人： Kenneth A. Fesler , Michel J. F. Digonnet , Byoung Y. Kim , Herbert J. Shaw
IPC分类号： G01B9/02 , G01C19/64 , G01C19/72 , G02B6/00 , G02B6/036 , G02F1/35 , H01S3/07 , H01S3/10
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.

7. 发明授权

US4964131A Broadband optical fiber laser 失效
标题翻译：宽带光纤激光器
公开(公告)号：US4964131A
公开(公告)日：1990-10-16
申请号：US319241
申请日：1989-03-09
申请人： Karen Liu , Byoung Y. Kim , Michel J. F. Digonnet , Kenneth A. Fesler , Herbert J. Shaw
发明人： Karen Liu , Byoung Y. Kim , Michel J. F. Digonnet , Kenneth A. Fesler , Herbert J. Shaw
IPC分类号： G01C19/72 , H01S3/067 , H01S3/094 , H01S3/0941
CPC分类号： G01C19/721 , H01S3/06795 , H01S3/0941 , H01S3/094003
摘要： An optical fiber laser includes a single-mode optical fiber doped with a lasing material such as Neodymium. The optical fiber is pumped with a pump optical signal having a pump wavelength selected to cause spontaneous emission of an optical signal at a second wavelength different from the pump wavelength. The optical fiber is formed into a laser cavity such as by including a suitable reflector at each of the two ends of a suitable length of the optical fiber so that the emitted optical signal oscillates therein. One of the reflectors has a reflectivity at the wavelength of the emitted light so that most (e.g., approximately 95%) of the emitted light is reflected back into the laser cavity and a smaller portion (e.g, approximately 5%) is transmitted through the mirror as a laser output signal. Alternatively, the optical fiber can be formed into a ring laser structure using an optical coupler that couples a substantial portion (e.g., approximately 95%) of the emitted light back into the ring for recirculation therein and provides a smaller portion of the emitted light (e.g., approximately 5%) as a laser output signal. The wavelength of the pump optical signal is selected to be outside the pump variable tuning range of the Neodymium-doped optical fiber (i.e., the range of pump wavelengths which stimulate emitted wavelengths having a average wavelengths with a generally one-to-one correspondence to the pump wavelength). Pumping with a pump signal outside the pump variable tuning ranges causes the emitted light to have a broad spectral envelope of longitudinal modes having emission wavelengths corresponding to substantially all the pump variable tuning range. Thus, by pumping the optical fiber with a single pump wavelength, a broadband laser output signal is generated.
摘要翻译：光纤激光器包括掺杂有诸如钕的激光材料的单模光纤。用选择了泵浦波长的泵浦光信号来泵浦光纤，以引起与泵浦波长不同的第二波长的光信号的自发发射。光纤被形成为激光腔，例如通过在光纤的适当长度的两端中的每一端包括合适的反射器，使得所发射的光信号在其中振荡。反射器中的一个在发射光的波长处具有反射率，使得大部分（例如，大约95％）的发射光被反射回到激光腔中，并且较小的部分（例如，大约5％）通过镜像为激光输出信号。或者，可以使用光耦合器将光纤形成为环形激光器结构，所述光耦合器将发射的光的大部分（例如，大约95％）重新连接到环中以在其中再循环，并且提供较小部分的发射光例如约5％）作为激光输出信号。泵浦光信号的波长被选择在掺杂钕光纤的泵可变调谐范围之外（即，泵浦波长的范围，其激发平均波长与一般一一对应的发射波长泵浦波长）。在泵可变调谐范围之外用泵浦信号泵送使得发射的光具有宽泛的光谱包络，其具有与基本上所有泵可变调谐范围对应的发射波长的纵向模式。因此，通过用单个泵浦波长泵浦光纤，产生宽带激光输出信号。

8. 发明授权

US4768851A Fiber optic modal coupler, interferometer and method of coupling spatial modes using same 失效
标题翻译：光纤模态耦合器，干涉仪和使用它们耦合空间模式的方法
公开(公告)号：US4768851A
公开(公告)日：1988-09-06
申请号：US884871
申请日：1986-07-09
申请人： Herbert J. Shaw , Robert C. Youngquist , Janet L. Brooks
发明人： Herbert J. Shaw , Robert C. Youngquist , Janet L. Brooks
IPC分类号： G02B6/28 , G02B6/34 , G02F1/01 , G02B6/26 , G01B9/02
CPC分类号： G02B6/29352 , G02B6/2726 , G02B6/2821 , G02F1/0134 , Y10S359/90
摘要： A modal coupler, for coupling between first and second order modes of an optical fiber, comprises a single continuous strand of optical fiber, and a device for applying stress to the optical fiber at spaced intervals along the fiber. The stress deforms the fiber and abruptly changes the fiber geometry at the beginning and end of each stressed region. The change in fiber geometry causes coupling of light from the fundamental mode to the second order mode. The coupler, under certain conditions, exhibits polarization dependence, and thus, it may be utilized as a fiber optic polarizer. In addition, the device couples coherently, and may be used in interferometric systems.
摘要翻译：用于在光纤的一阶和二阶模之间耦合的模式耦合器包括单个连续的光纤链，以及用于沿光纤以间隔间隔向光纤施加应力的装置。应力使纤维变形，并突然改变每个应力区域的开始和结束处的纤维几何形状。光纤几何形状的改变导致从基模到二阶模的耦合。在一定条件下，耦合器具有偏振相关性，因此可用作光纤偏振器。此外，该装置相干耦合，并可用于干涉系统。

9. 发明授权

US4684215A Single mode fiber optic single sideband modulator and method of frequency 失效
标题翻译：单模光纤单边带调制器和频率法
公开(公告)号：US4684215A
公开(公告)日：1987-08-04
申请号：US556636
申请日：1983-11-30
申请人： Herbert J. Shaw , Robert C. Youngguist , Janet L. Brooks
发明人： Herbert J. Shaw , Robert C. Youngguist , Janet L. Brooks
IPC分类号： G02B6/00 , G02B6/14 , G02B6/28 , G02F1/01 , G02F1/125 , G02F2/02 , G02B6/02 , G02B5/30 , G02F1/11
CPC分类号： G02B6/2821 , G02F1/0134
摘要： A fiber optic frequency shifter comprising two waveguides having different indices of refraction. In some embodiments the waveguides are two modes of propagation in one fiber. Plural distributed coupling ridges, or electrodes mounted adjacent piezoelectric materials, are independently driven to apply sinusoidally varying forces to the fiber. In some embodiments, the phase relationship of the driving signals for the electrodes or ridges is such that a travelling acoustic wave is launched in the fiber. In other embodiments, regions of stress in the fiber are created by an acoustic wave coupled into the fiber from a transducer coupled to an acoustic medium surrounding the fiber. The input carrier light is shifted in frequency by the frequency of the acoustic wave.
摘要翻译：一种光纤移频器，包括具有不同折射率的两个波导。在一些实施例中，波导是在一个光纤中的两种传播模式。多个分布耦合脊或邻近压电材料安装的电极被独立地驱动以向光纤施加正弦变化的力。在一些实施例中，用于电极或脊的驱动信号的相位关系使得行进声波在光纤中发射。在其他实施例中，光纤中的应力区域是由耦合到围绕光纤的声学介质的传感器耦合到光纤中的声波产生的。输入载波的频率以声波的频率移动。

10. 发明授权

US4832437A Fiber optic inter-mode coupling single side band frequency shifter 失效
标题翻译：光纤互耦合单边带变频器
公开(公告)号：US4832437A
公开(公告)日：1989-05-23
申请号：US48142
申请日：1987-05-11
申请人： Byoung Y. Kim , Herbert J. Shaw , Helege E. Engan , James N. Blake
发明人： Byoung Y. Kim , Herbert J. Shaw , Helege E. Engan , James N. Blake
IPC分类号： G02B6/14 , G02B6/28 , G02F1/01
CPC分类号： G02B6/14 , G02B6/2821 , G02F1/0134
摘要： An optical fiber is subjected to a series of traveling flexural waves propagating along a length of the fiber. At least a portion of an optical signal propagating within the optical fiber in a first propagation mode is coupled to a second propagation mode. The optical signal in the second propagation mode has a frequency which is equal to either the sum of or the difference between the frequency of the optical signal in the first propagation mode and the frequency of the traveling flexural waves. The frequency of the optical signal in the second propagation mode is shifted upward or downward from the frequency of the optical signal in the first propagation mode as determined by the direction of propagation of the first optical signal with respect to the direction of propagation of the traveling flexural waves, and as also determined by whether the phase propagation velocity of the optical signal in the first propagation mode is greater than or less than the propagation velocity of the optical signal in the second propagation mode.
摘要翻译：光纤经受沿纤维长度传播的一系列行进弯曲波。以第一传播模式在光纤内传播的光信号的至少一部分耦合到第二传播模式。第二传播模式中的光信号具有等于第一传播模式中的光信号的频率与行进的弯曲波的频率的和之和的频率的频率。第二传播模式中的光信号的频率从第一传播模式中的光信号的频率向上或向下偏移，由第一光信号相对于传播的传播方向的传播方向确定弯曲波，并且还根据第一传播模式中的光信号的相位传播速度是否大于或小于第二传播模式中的光信号的传播速度来确定。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式