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1.发明授权Optical spectrometer with improved geometry and data processing for monitoring fiber optic bragg gratings 失效具有改进的几何形状和数据处理用于监测光纤布拉格光栅的光谱仪公开(公告)号：US06233373B1
公开(公告)日：2001-05-15
申请号：US09337159
申请日：1999-06-21
IPC分类号： G02B602
CPC分类号： G01J3/02 , G01J3/021 , G01J3/18 , G01J3/1895 , G01J3/2803 , G02B6/2932
摘要： An aspect of the present invention is an optical spectrometer for detecting a spectral signature of a input optical signal, including: (a) a collimating lens having an optical axis and focal plane, for collimating the input optical signal; (b) an input optical system, for directing the input optical signal to the collimating lens; (c) a diffraction grating, for scattering the collimated input optical signal, positioned in the path of collimated light from the collimating lens, oriented to reflect a majority of the scattered light through the collimating lens; and (d) a detector, in a focal plane of the collimating lens. Another aspect of the invention is a fiber-based sensing system using the optical spectrometer of the invention. Such a system will include (a) an optical fiber having an array of fiber Bragg gratings, where each of the gratings is reflective at a selected wavelength; (b) a light source, for radiating light at each of the selected wavelengths, optically coupled to the optical fiber; and (c) the optical spectrometer of the invention, optically coupled to the optical fiber, for detecting a spectral signature of reflected light from the fiber Bragg gratings. Typically, the spectrometer output will be fed to a data capturing system, and subsequently to a data analysis system, which may combined in a single computer system for control, data capture.
摘要翻译： 本发明的一个方面是用于检测输入光信号的光谱特征的光谱仪，包括：（a）具有光轴和焦平面的准直透镜，用于准直输入光信号; （b）用于将输入光信号引导到准直透镜的输入光学系统; （c）衍射光栅，用于散射位于来自准直透镜的准直光的路径中的准直输入光信号，其被定向成反射大部分散射光通过准直透镜; 和（d）在准直透镜的焦平面中的检测器。 本发明的另一方面是使用本发明的光谱仪的基于光纤的感测系统。 这样的系统将包括（a）具有光纤布拉格光栅阵列的光纤，其中每个光栅以选定的波长反射; （b）光源，用于在每个所选择的波长处照射光，光耦合到光纤; 和（c）光学耦合到光纤的本发明的光谱仪，用于检测来自光纤布拉格光栅的反射光的光谱特征。 通常，光谱仪输出将被馈送到数据捕获系统，然后被馈送到数据分析系统，其可以组合在单个计算机系统中用于控制，数据捕获。
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2.发明申请公开(公告)号：US20120281205A1
公开(公告)日：2012-11-08
申请号：US13552948
申请日：2012-07-19
申请人： Charles G. Askins
发明人： Charles G. Askins
IPC分类号： G01N21/23
CPC分类号： G01M11/088 , G01D5/344 , G01D5/35316 , G01D5/35354 , G01M11/3181 , G02B6/274 , G02B6/29319
摘要： A method of measuring fiber twist in a multi-core optical fiber bearing an FBG with polarization dependent reflectivity. The state of polarization of the launched light is adjusted until the reflected FBG wavelength is maximal, indicating that light reaching the FBG is linearly polarized, and the polarization axis of the light reaching the FBG is aligned with the slow birefringent axis of the FBG; the SOP of launched light is now measured. Bending experienced by the fiber is measured conventionally, and birefringence produced by bending of the multi-core optical fiber is calculated. A candidate amount of twist between the launch location and the FBG is proposed, and the corresponding twist-induced birefringence is calculated. When calculations show that light with the launched SOP becomes linearly polarized and aligned with the FBG after traversing a fiber section with the calculated birefringences and proposed rotation, the amount of twist has been properly identified.
摘要翻译： 在具有偏振相关反射率的FBG的多芯光纤中测量纤维捻度的方法。 调整发射光的偏振状态，直到反射的FBG波长最大，表示到达FBG的光线性偏振，并且到达FBG的光的偏振轴与FBG的慢双折射轴对准; 现在测量发射光的SOP。 通常测量纤维经历的弯曲，并且计算通过多芯光纤的弯曲产生的双折射。 提出了发射位置和FBG之间的候选扭曲量，并计算出相应的扭曲双折射。 当计算结果表明，使用推出的SOP的光线在通过计算的双折射和提出的旋转穿过纤维部分之后，线性偏振并与FBG对准，扭曲量已被适当地识别。
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3.发明授权Technique to prepare high-reflectance optical fiber bragg gratings with single exposure in-line or fiber draw tower 失效制备具有单次曝光在线或纤维拉制塔的高反射率光纤布拉格光栅的技术
公开(公告)号：US5400422A
公开(公告)日：1995-03-21
申请号：US6544
申请日：1993-01-21
IPC分类号： C03B37/027 , C03C25/62 , G02B6/34
CPC分类号： G02B6/02133 , C03B37/027 , C03C25/6226 , C03C25/6233 , C03B2201/31 , C03B2201/34 , C03B2201/36 , C03B2203/18 , C03B2205/20 , G02B2006/02157
摘要： A process for making an optical reflection grating in a glass fiber includes exposing an unjacketed optic fiber to a single writing pulse from a pair of interfering light beams that form an interference pattern in the fiber. A novel optical fiber has at least one optical grating with a preselected Bragg spacing in at least one region of the fiber, with a periodic modulation in its index of refraction, with high thermal stability and narrow linewidth. A process for making an array of optical reflection gratings in a glass fiber includes exposing a fiber to a plurality of writing pulse from a pair of interfering light beams that form an interference pattern in the fiber, where these pulses are applied sequentially as the fiber is drawn from a draw furnace. A novel optical fiber has a plurality of unspliced gratings with high thermal stability and narrow linewidth.
摘要翻译： 用于在玻璃纤维中制造光学反射光栅的工艺包括将未封装的光纤暴露于在光纤中形成干涉图案的一对干涉光束的单个写入脉冲。 一种新颖的光纤具有在光纤的至少一个区域中具有预选布拉格间隔的至少一个光栅，其折射率具有周期性调制，具有高热稳定性和窄线宽。 用于在玻璃纤维中制造光学反射光栅阵列的工艺包括将光纤暴露于来自在光纤中形成干涉图案的一对干涉光束的多个写入脉冲，其中这些脉冲是随着光纤被依次施加的 从拉丝机拉出。 新颖的光纤具有多个具有高热稳定性和窄线宽的未切割光栅。
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4.依法登记的发明
公开(公告)号：USH1268H
公开(公告)日：1993-12-07
申请号：US906093
申请日：1992-06-29
IPC分类号： G01M11/00 , G01N21/23 , G01N21/00 , C03B37/075
摘要： A technique and apparatus for detecting the internal rotation of the principal axes in the fabrication of birefringent fibers is based upon a new method for producing and interpreting the interference fringe pattern backscattered power from a birefringent fiber side-illuminated with a laser light source to determine the internal orientation of the strain-inducing axes. An apparatus employing this technique for controlling internal rotation of the principal axes provides for adjustment of the orientation of at least one of the traction surfaces pulling the fiber during drawing fabrication to maintain parallel alignment of the planes of rotation of the surfaces to reduce the fiber rotation-inducing motion which leads to internal rotation of the fiber's principal axes.
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