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公开(公告)号:US06480635B1
公开(公告)日:2002-11-12
申请号:US09554559
申请日:2000-05-15
IPC分类号: G02B627
CPC分类号: G02B6/447
摘要: In order to identify a fiber optic cable (10) a beam (14) of polarized light is caused to pass down the cable to a first site (A) at which an electromagnetic field (24) is applied to the cable (10). The electromagnetic field (24) traverses the cable (10) in an essentially transverse direction and has a time-varying component orientated along the length of the cable (10) at the first site (A), with the component varying so that the line integral thereof along the cable (10) is non-zero. This results in a variation in the polarization of the light, which can then be detected by a polarization discriminator (20) at a second site (B), thereby to identify the cable (10).
摘要翻译: 为了识别光纤电缆(10),使得偏振光束(14)将电缆穿过第一位置(A),在第一位置(A)处将电磁场(24)施加到电缆(10)。 电磁场(24)在基本横向上横穿电缆(10),并且具有沿第一位置(A)处的电缆(10)的长度方向定向的时变分量,其中部件变化,使得线 沿着电缆(10)的整体不为零。 这导致光的偏振变化,其然后可以在第二位置(B)处由偏振鉴别器(20)检测,从而识别电缆(10)。
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公开(公告)号:US06650798B2
公开(公告)日:2003-11-18
申请号:US10288431
申请日:2002-11-06
IPC分类号: G02B627
CPC分类号: G02B6/447
摘要: In order to identify a fiber optic cable (10) a beam (14) of polarised light is caused to pass down the cable to a first site (A) at which an electromagnetic field (24) is applied to the cable (10). The electromagnetic field (24) traverses the cable (10) in an essentially transverse direction and has a time-varying component orientated along the length of the cable (10) at the first site (A), with the component varying so that the line integral thereof along the cable (10) is non-zero. This results in a variation in the polarisation of the light, which can then be detected by a polarisation discriminator (20) at a second site (B), thereby to identify the cable (10).
摘要翻译: 为了识别光纤电缆(10),使得偏振光束(14)将电缆穿过第一位置(A),在第一位置(A)处将电磁场(24)施加到电缆(10)。 电磁场(24)在基本横向上横穿电缆(10),并且具有沿第一位置(A)处的电缆(10)的长度方向定向的时变分量,其中部件变化,使得线 沿着电缆(10)的整体不为零。 这导致光的偏振变化,其然后可以在第二位置(B)处由偏振鉴别器(20)检测,从而识别电缆(10)。
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公开(公告)号:US06490045B1
公开(公告)日:2002-12-03
申请号:US09806963
申请日:2001-04-06
IPC分类号: G01B902
CPC分类号: G01D5/35322
摘要: A Sagnac or loop type interferometer is disclosed which uses a single broadband Erbium-doped fibre source (10) and a single IngaAs detector (150) together with a 40 km long sensor loop (90). A wavelength division multiplexer (50) spectrally slices the broadband light from the source (10) into two sub-bands, with different optical paths being defined between the source (10) and detector (150) for the light in the different spectrally sliced sub-bands. The two optical paths include separate phase modulators (70, 130) which modulate the two signals at different frequencies, and also separate delay loops (60, 130) at different places relative to the sensor loop (90). Effectively, two separate Sagnac loops are provided with a single sensor loop (90), source (10) and detector (150). Standard phase locked loop techniques can be used to extract information from signals that have passed through the two loops and to determine the location of a mechanical or thermal perturbation applied to the sensor loop (90).
摘要翻译: 公开了一种Sagnac或环型干涉仪,其使用单个宽带掺铒光纤源(10)和单个IngaAs检测器(150)以及40km长的传感器回路(90)。 波分多路复用器(50)将来自源(10)的宽带光光谱地切割成两个子带,其中在源(10)和检测器(150)之间限定不同光路,用于不同光谱切片子 带。 两个光路包括调制不同频率的两个信号的分离的相位调制器(70,130),以及在相对于传感器回路(90)的不同位置处分离的延迟环路(60,130)。 有效地,两个单独的Sagnac回路设置有单个传感器回路(90),源极(10)和检测器(150)。 标准锁相环技术可用于从已经通过两个环路的信号中提取信息,并确定施加到传感器回路(90)的机械或热扰动的位置。
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