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公开(公告)号：US20080229825A1
公开(公告)日：2008-09-25
申请号：US10586105
申请日：2005-01-12
IPC分类号： G01P15/02
CPC分类号： G01H9/004 , G01P15/093 , G01V1/181 , G02F1/0134
摘要： A fibre optic accelerometer particularly intended for use with an interferometer using the compliant cylinder approach but further providing a seismic mass at the core of the cylinder resulting in improved sensitivity and rejection of out-of-axis inputs.
摘要翻译： 特别是与干涉仪一起使用的光纤加速度计，其使用柔性气缸方式，但进一步在气缸的核心处提供地震质量，从而提高了轴外输入的灵敏度和排除。
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公开(公告)号：US08079261B2
公开(公告)日：2011-12-20
申请号：US10586105
申请日：2005-01-12
IPC分类号： G01P15/13
CPC分类号： G01H9/004 , G01P15/093 , G01V1/181 , G02F1/0134
摘要： A fibre optic accelerometer particularly intended for use with an interferometer using the compliant cylinder approach but further providing a seismic mass at the core of the cylinder resulting in improved sensitivity and rejection of out-of-axis inputs.
摘要翻译： 特别是与干涉仪一起使用的光纤加速度计，其使用柔性气缸方式，但进一步在气缸的核心处提供地震质量，从而提高了轴外输入的灵敏度和排除。
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公开(公告)号：US09599489B2
公开(公告)日：2017-03-21
申请号：US12282784
申请日：2007-03-08
CPC分类号： G01D5/35383 , G01D5/35303
摘要： A fiber-optic sensor array (100) comprises a line array of fiber-optic sensor packages (AX, BX, CX, DX, AY, BY, CY, DY, AZ, BZ, CZ, DZ) each having a package input/output (i/o) fiber and each being arranged to output a finite output pulse series of optical output pulses via the package i/o fiber in response to input thereto of one or more interrogating optical pulses. The array further comprises a fiber-optic bus (104,106, 108, 110) extending along the length of the line array, each package i/o fiber being optically coupled to the fiber-optic bus at a respective positions along the line array. The array allows interrogation at a higher frequency than is the case for a serial array of the same number of fiber-optic sensing packages.
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公开(公告)号：US20120188533A1
公开(公告)日：2012-07-26
申请号：US13499076
申请日：2010-09-24
IPC分类号： G01N21/49
CPC分类号： G01D5/35303 , G01H9/004
摘要： A method of distributed acoustic sensing (DAS) whereby the derivative or rate of change of a signal backscatted from a fibre is measured. The change, or derivative of the phase measured in this way has a much smaller amplitude than the signal itself if the difference between the two times at which the signal is measured is much less than the period of the signal being measured, resulting in lower sensitivity. Frequency shifts can be applied to temporally displaced return signals to compare the rate of change, for example by employing an output interferometer arranged to modulate the signal in each arm by a different frequency shift.
摘要翻译： 一种分布式声学感测（DAS）的方法，其中测量从光纤反向扫描的信号的微分或变化率。 以这种方式测量的相位的变化或导数比信号本身的幅度小得多，如果测量信号的两次之间的差异远小于被测信号的周期，导致较低的灵敏度 。 频移可以应用于时间上移位的返回信号以比较变化率，例如通过采用布置成通过不同频移调制每个臂中的信号的输出干涉仪。
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公开(公告)号：US20090080828A1
公开(公告)日：2009-03-26
申请号：US12282784
申请日：2007-03-08
IPC分类号： G02B6/00
CPC分类号： G01D5/35383 , G01D5/35303
摘要： A fibre-optic sensor array (100) comprises a line array of fibre-optic sensor packages (AX, BX, CX, DX, AY, BY, CY, DY, AZ, BZ, CZ, DZ) each having a package input/output (i/o) fibre and each being arranged to output a finite output pulse series of optical output pulses via the package i/o fibre in response to input thereto of one or more interrogating optical pulses. The array further comprises a fibre-optic bus (104,106, 108, 110) extending along the length of the line array, each package i/o fibre being optically coupled to the fibre-optic bus at a respective positions along the line array. The array allows interrogation at a higher frequency than is the case for a serial array of the same number of fibre-optic sensing packages.
摘要翻译： 光纤传感器阵列（100）包括光纤传感器封装（AX，BX，CX，DX，AY，BY，CY，DY，AZ，BZ，CZ，DZ）的线阵列， 输出（i / o）光纤，并且每个光纤布置成响应于一个或多个询问光脉冲的输入，经由封装i / o光纤输出有限的输出脉冲序列的光输出脉冲。 阵列还包括沿着线阵列的长度延伸的光纤总线（104,106,108,110），每个封装i / o光纤在沿着线阵列的相应位置处光耦合到光纤总线。 该阵列允许以比相同数量的光纤传感封装的串行阵列的情况更高的频率进行询问。
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公开(公告)号：US09677956B2
公开(公告)日：2017-06-13
申请号：US13509425
申请日：2010-11-11
IPC分类号： G02B6/02 , G01N9/00 , G01N21/47 , G01L1/24 , G01D5/353 , G01H9/00 , G01L11/02 , G02B6/44 , G02B6/032
CPC分类号： G01L1/243 , G01D5/3538 , G01H9/004 , G01L11/025 , G01V1/208 , G01V1/52 , G02B6/02 , G02B6/443 , G02B2006/0325
摘要： Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) and surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximised compared with the core being located at the center of the cable.
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公开(公告)号：US20120222487A1
公开(公告)日：2012-09-06
申请号：US13509425
申请日：2010-11-11
CPC分类号： G01L1/243 , G01D5/3538 , G01H9/004 , G01L11/025 , G01V1/208 , G01V1/52 , G02B6/02 , G02B6/443 , G02B2006/0325
摘要： Fibre optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fibre optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) and surrounded by a jacket (204) and arranged so that the core is offset from the centre of the cable. By offsetting the core from the centre of the jacket any bending effects on the core can be maximised compared with the core being located at the centre of the cable.
摘要翻译： 公开了在分布式感测中使用具有改进性能的光缆，例如在分布式声学传感器中。 在一个实施例中，光纤电缆（210）包括设置在缓冲材料（202）内并由护套（204）围绕的芯体（208）和包层（206），并布置成使得芯部从 电缆。 通过将芯从夹套的中心偏移，与位于电缆中心的芯相比，可以最大限度地提高芯的弯曲效果。
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公开(公告)号：US20080277568A1
公开(公告)日：2008-11-13
申请号：US12091076
申请日：2006-10-18
IPC分类号： G01J1/42
CPC分类号： G08G1/02 , G01D5/35361
摘要： Traffic sensing and monitoring apparatus (100) comprises a length of optical fibre (112), means (102, 103, 104, 106, 107, 109, 119) arranged to introduce a series of pulse pairs into an input end of the length, each of the pulse pairs comprising first and second pulses of radiation having a frequency difference Ω and the second pulse being delayed with respect to the first by a delay τ, and the apparatus further comprising a photodetector arranged to detect radiation which is Rayleigh-backscattered within the length of fibre towards the input end to generate an output signal in response thereto. Apparatus of the invention allows sensing and monitoring of traffic at any position along a long length of road (e.g. 5 km) with lower installation and maintenance costs per unit length compared to prior art systems providing the same spatial resolution.
摘要翻译： 交通感测和监测设备（100）包括一段长度的光纤（112），被布置成将一系列脉冲对引入长度的输入端的装置（102,103,104,106,107,109,119） 每个脉冲对包括具有频差Ω的第一和第二辐射脉冲，并且第二脉冲相对于第一脉冲相对于第一脉冲被延迟延迟τ，并且该装置还包括光电检测器，该光检测器被布置成检测辐射内的瑞利反向散射 光纤朝向输入端的长度，以响应于此产生输出信号。 与提供相同空间分辨率的现有技术系统相比，本发明的装置允许在沿着长的道路（例如5km）的任何位置处感测和监测每单位长度的安装和维护成本。
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公开(公告)号：US08537345B2
公开(公告)日：2013-09-17
申请号：US13499076
申请日：2010-09-24
IPC分类号： G01N21/00
CPC分类号： G01D5/35303 , G01H9/004
摘要： A method of distributed acoustic sensing (DAS) whereby the derivative or rate of change of a signal backscatted from a fiber is measured. The change, or derivative of the phase measured in this way has a much smaller amplitude than the signal itself if the difference between the two times at which the signal is measured is much less than the period of the signal being measured, resulting in lower sensitivity. Frequency shifts can be applied to temporally displaced return signals to compare the rate of change, for example by employing an output interferometer arranged to modulate the signal in each arm by a different frequency shift.
摘要翻译： 一种分布式声学感测（DAS）的方法，其中测量从光纤反向扫描的信号的微分或变化率。 以这种方式测量的相位的变化或导数比信号本身的幅度小得多，如果测量信号的两次之间的差异远小于被测信号的周期，导致较低的灵敏度 。 频移可以应用于时间上移位的返回信号以比较变化率，例如通过采用布置成通过不同频移调制每个臂中的信号的输出干涉仪。
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公开(公告)号：US07652245B2
公开(公告)日：2010-01-26
申请号：US12091076
申请日：2006-10-18
IPC分类号： G01J1/04
CPC分类号： G08G1/02 , G01D5/35361
摘要： Traffic sensing and monitoring apparatus (100) comprises a length of optical fiber (112), means (102, 103, 104, 106, 107, 109, 119) arranged to introduce a series of pulse pairs into an input end of the length, each of the pulse pairs comprising first and second pulses of radiation having a frequency difference Ω and the second pulse being delayed with respect to the first by a delay τ, and the apparatus further comprising a photodetector arranged to detect radiation which is Rayleigh-backscattered within the length of fiber towards the input end to generate an output signal in response thereto. Apparatus of the invention allows sensing and monitoring of traffic at any position along a long length of road (e.g. 5 km) with lower installation and maintenance costs per unit length compared to prior art systems providing the same spatial resolution.
摘要翻译： 交通感测和监测设备（100）包括一段长度的光纤（112），被布置成将一系列脉冲对引入长度的输入端的装置（102,103,104,106,107,109,119） 每个脉冲对包括具有频差Ω的第一和第二辐射脉冲，并且第二脉冲相对于第一脉冲相对于第一脉冲延迟延迟τ，并且该装置还包括光电检测器，该光检测器被布置成检测辐射内的瑞利反向散射 光纤朝向输入端的长度，以响应于此产生输出信号。 与提供相同空间分辨率的现有技术系统相比，本发明的装置允许在沿着长的道路（例如5km）的任何位置处感测和监测每单位长度的安装和维护成本。
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