WO2017219568A1 - 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法 - Google Patents

一种光频域反射中利用阿基米德螺旋线的光纤铺设方法 Download PDF

Info

Publication number
WO2017219568A1
WO2017219568A1 PCT/CN2016/103520 CN2016103520W WO2017219568A1 WO 2017219568 A1 WO2017219568 A1 WO 2017219568A1 CN 2016103520 W CN2016103520 W CN 2016103520W WO 2017219568 A1 WO2017219568 A1 WO 2017219568A1
Authority
WO
WIPO (PCT)
Prior art keywords
dimensional
information
strain
optical fiber
laying method
Prior art date
Application number
PCT/CN2016/103520
Other languages
English (en)
French (fr)
Inventor
刘铁根
丁振扬
杨迪
刘琨
江俊峰
徐哲茜
Original Assignee
天津大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US15/565,682 priority Critical patent/US20190121048A1/en
Application filed by 天津大学 filed Critical 天津大学
Publication of WO2017219568A1 publication Critical patent/WO2017219568A1/zh

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0977—Reflective elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0006—Coupling light into the fibre

Definitions

  • the invention relates to the technical field of distributed optical fiber sensing instruments, in particular to a fiber laying method using an Archimedes spiral in optical frequency domain reflection.
  • High-precision, high spatial resolution distributed strain sensing is widely used in many fields such as people's death and national defense security, such as structural health monitoring of key parts such as aircraft, spacecraft, ships, defense equipment, industrial equipment, and bridge culverts.
  • distributed strain sensing in a two-dimensional space can be realized by using a fiber laying method such as parallel laying.
  • strain may occur in all directions in the two-dimensional space.
  • the fiber laying method can only reflect the strain in one direction more obviously. Therefore, it is necessary to adopt a new method to reflect the two-dimensional strain in all directions.
  • the invention provides a fiber laying method using an Archimedes spiral in optical frequency domain reflection, and the invention overcomes the problem of the existing multi-directional sensing insensitivity, and adopts an Archimedes spiral shape to realize the second
  • the requirements for dimensional strain multi-directional sensing are described below:
  • optical fiber laying method using an Archimedes spiral in optical frequency domain reflection comprising the following steps:
  • the two-dimensional strain sensing device performs continuous secondary measurement, performs cross-correlation operation on two local distance domain one-dimensional information, and obtains one-dimensional information strain change amount corresponding to the two measurements through the obtained cross-correlation information;
  • the one-dimensional information of the local distance domain is derived corresponding to the two-dimensional angle information and the radius of curvature information in the panel to be measured;
  • the one-dimensional information strain change amount is corresponding to the coordinate position corresponding to the two-dimensional plane, that is, the two-dimensional strain information is obtained.
  • the step of acquiring the one-dimensional information of the local distance domain is specifically:
  • the beat frequency interference signal is formed by the fiber back to Rayleigh scattering, and the beat frequency interference signal is respectively subjected to fast Fourier transform;
  • the fiber laying method adopts a line type of Archimedes spiral wire, and measures the strain in a two-dimensional space by using one fiber.
  • the strain change amount of the one-dimensional information is corresponding to the coordinate position corresponding to the two-dimensional plane, that is, the two-dimensional strain information is specifically:
  • the technical solution provided by the present invention has the beneficial effects that the present invention performs distributed strain measurement based on fiber Rayleigh backscattering frequency shift in optical frequency domain reflection, and arranges fiber on the plate to be measured by Archimedes spiral line type.
  • the measurement of the two-dimensional strain realizes the requirement for the two-dimensional strain multi-directional sensing; that is, the invention measures the two-dimensional strain by using one optical fiber, thereby realizing the measurement of the transverse, longitudinal and combined direction strains, and solves the problem.
  • the existing multi-directional sensing is not sensitive, and meets various needs in practical applications.
  • 1 is a flow chart of a fiber laying method using an Archimedes spiral in optical frequency domain reflection
  • 2 is a flow chart for solving two-dimensional strain information by an Archimedes spiral expression according to one-dimensional strain distance information
  • FIG. 3 is a schematic diagram of a two-dimensional strain sensing device applied in the method
  • FIG. 4 is a schematic view showing a fiber laying method of a two-dimensional strain sensing device
  • Figure 5 is an experimental effect diagram.
  • 24 a clock triggering system based on an auxiliary interferometer
  • 25 a primary interferometer
  • 16 a first polarizing beam splitter
  • 17 a second polarizing beam splitter
  • 151 optical fiber
  • 152 flat plate to be measured.
  • An embodiment of the present invention provides a fiber laying method using an Archimedes spiral in optical frequency domain reflection.
  • the optical fiber laying method includes the following steps:
  • the one-dimensional information strain change amount is corresponding to the coordinate position corresponding to the two-dimensional plane, that is, the two-dimensional strain information is obtained.
  • the step of acquiring the one-dimensional information of the local distance domain in step 101 is specifically:
  • the beat frequency interference signal is formed by the fiber back to Rayleigh scattering, and the beat frequency interference signal is respectively subjected to fast Fourier transform;
  • the optical frequency domain information is converted to the distance domain information corresponding to each location, and the distance domain information is sequentially selected by the moving window of a certain width to form the local distance domain one-dimensional information.
  • the fiber laying method adopts a line type of Archimedes spiral wire, and uses one fiber to measure the strain in a two-dimensional space.
  • the fiber end does not require any device, which simplifies the operation.
  • the embodiment of the present invention performs distributed strain measurement based on the optical fiber Rayleigh backscattering frequency shift in the optical frequency domain reflection, and uses the Archimedes spiral line type to arrange the optical fiber on the tablet to be measured, and measures the two-dimensional. Strain, the need for two-dimensional strain multi-directional sensing.
  • Embodiment 1 The solution in Embodiment 1 is further described below with reference to FIG. 1 , FIG. 2 , and a specific calculation formula.
  • the parameter measurement and calculation involved in the fiber laying method are implemented by a two-dimensional strain sensing device, as described below. description:
  • 201 Forming a beat frequency interference signal from a fiber back to Rayleigh scattering in a two-dimensional strain sensing device, and performing fast Fourier transform on the beat frequency interference signal respectively, and converting the optical frequency domain information to a distance corresponding to each position Domain information, the distance domain information is sequentially selected by moving windows of a certain width to form one-dimensional information of the local distance domain;
  • the one-dimensional information strain change amount is corresponding to the coordinate position corresponding to the two-dimensional plane, that is, the two-dimensional strain information is obtained.
  • Curve length function It is possible to pass the pair of differential dl at 0 to Calculate by integrating; The total angle at which the fiber is spirally formed on the plate to be measured.
  • the formula for the length of the Archimedes spiral about the angle can be obtained as:
  • the inverse function can be used to derive the two-dimensional coordinates corresponding to the one-dimensional length L according to the polar coordinates.
  • the two-dimensional coordinate x, y corresponding to the one-dimensional length L can be derived from the polar coordinates:
  • the embodiment of the present invention performs distributed strain measurement based on the Rayleigh scattering spectrum shift of the single-mode fiber in the optical frequency domain reflection, and uses the Archimedes spiral line type to arrange the optical fiber on the tablet to be measured, and measures the two-dimensional. Strain, the need for two-dimensional strain multi-directional sensing.
  • Embodiments 1 and 2 of the present invention will be described in detail below with reference to FIG. 3 and FIG. 4, which are described in detail below.
  • the two-dimensional strain sensing device includes a tunable laser 1, a 1:99 beam splitter 4, a computer 11, a GPIB control module 21, a clock interferometer system 24 based on an auxiliary interferometer, and a main interferometer 25.
  • the auxiliary interferometer-based clock trigger system 24 includes: a detector 2, a first 50:50 coupler 5, a clock multiplying circuit module 6, a delay fiber 7, a first Faraday mirror 8, a second Faraday mirror 9, and an isolation 10.
  • the auxiliary interferometer based clock triggering system 24 is used to achieve equal optical frequency spacing sampling with the purpose of suppressing non-linear scanning of the light source.
  • the main interferometer 25 includes: a 50:50 beam splitter 3, a polarization controller 12, a circulator 13, a second 50:50 coupler 14, a two-dimensional strain sensing fiber 15, a first polarization beam splitter 16, and a second The polarization beam splitter 17, the first balance detector 18, the second balance detector 19, the acquisition device 20, the reference arm 22, and the test arm 23.
  • the main interferometer 25 is the core of the optical frequency domain reflectometer, which is a modified Mach Zehnder interferometer.
  • the input end of the GPIB control module 21 is connected to the computer 11; the output end of the GPIB control module 21 is connected to the tunable laser 1; the tunable laser 1 is connected to the a port of the 1:99 optical beam splitter 4; 1:99 optical beam splitter 4
  • the b port is connected to one end of the isolator 10; the c port of the 1:99 optical beam splitter 4 is connected to the a port of the 50:50 beam splitter 3; the other end of the isolator 10 is coupled to the first 50:50 coupler 5
  • the b port is connected; the a port of the first 50:50 coupler 5 is connected to one end of the detector 2; the c port of the first 50:50 coupler 5 is connected to the first Faraday mirror 8; the first 50:50 coupling
  • the d port of the device 5 is connected to the second Faraday mirror 9 via the delay fiber 7; the other end of the detector 2 is connected to the input of the clock multiplying circuit module 6; the
  • the computer 11 controls the tunable laser 1 through the GPIB control module 21 to control the tuning speed, the center wavelength, the tuning start, etc.; the tunable laser 1 emits light by a 1:99 beam splitting
  • the port a of the device 4 enters and enters the b port of the first 50:50 coupler 5 from the b port of the 1:99 beam splitter 4 through the isolator 10 at a ratio of 1:99, the light from the first 50:50
  • the b port of the coupler 5 enters, exits from the c and d ports of the first 50:50 coupler 5, is reflected by the first Faraday rotator 8 and the second Faraday rotator 9 of the two arms, respectively, and returns to the first 50: 50, c, d port of coupler 5, two beams of light interfere in the first 50:50 coupler 5, output from the a port of the first 50:50 coupler 5; the first 50:50 couples a port a
  • the exiting light of the tunable laser 1 enters from the a port of the 1:99 beam splitter 4, from the c port of the 1:99 beam splitter 4 to the a port of the 50:50 beam splitter 3; after 50:50
  • the beam 3 enters the polarization controller 12 in the reference arm 22 from the b port, enters the a port of the circulator 13 on the test arm 23 from the c port; the light enters from the a port of the circulator 13 from the c port of the circulator 13 Entering the two-dimensional strain sensing fiber 15, and the backscattered light of the two-dimensional strain sensing fiber 15 enters from the port c port of the circulator 13 and is output from the port b port of the circulator 13; the output of the polarization controller 12 in the reference arm 22
  • the reference light passes through the a port of the second 50:50 coupler 14 and the backscattered light on the circulator 13 through the b port of the second 50:50 coupler 14 to form a beat interference and from
  • the GPIB control module 21 is used by the computer 11 to control the tunable laser 1 therethrough.
  • the tunable laser 1 is used to provide a light source for the optical frequency domain reflection system, the optical frequency of which can be linearly scanned.
  • the isolator 10 prevents reflected light from the b port of the first 50:50 coupler 5 in the auxiliary interferometer from entering the laser.
  • the first 50:50 coupler 5 is used for optical interference.
  • the delay fiber 7 is used to achieve beat frequency interference of the non-equal arm, and the optical frequency can be obtained according to the beat frequency and the delay fiber length.
  • the first Faraday rotator 8 and the second Faraday rotator 9 are used to provide reflection to the interferometer and to eliminate the polarization fading phenomenon of the interferometer.
  • the polarization controller 12 functions to adjust the polarization state of the reference light such that the intensity of the light is substantially uniform in the two orthogonal directions at the time of polarization beam splitting.
  • the second 50:50 coupler 14 performs polarization splitting on the signal, eliminating the effects of polarization fading noise.
  • the computer 11 performs data processing on the interference signal collected by the acquisition device 20 to realize distributed temperature strain sensing based on the amount of movement of the fiber Rayleigh scattering spectrum.
  • the two-dimensional strain sensing fiber 15 applied in the embodiment of the present invention is composed of an optical fiber 151 and a flat plate 152 to be measured.
  • the embodiment of the present invention does not limit the type of the optical fiber 151.
  • the to-be-measured flat plate 152 can be any flat plate to be measured, and the embodiment of the present invention does not limit its structure.
  • the embodiment of the present invention is only described by taking the two-dimensional strain sensing device in FIG. 3 and FIG. 4 as an example. In the specific implementation, other types of two-dimensional strain sensing devices may be used, which are not limited in this embodiment of the present invention. .
  • the model of each device is not limited unless otherwise specified, as long as the device capable of performing the above functions can be used.
  • Embodiments 1 and 2 The feasibility of the solutions in Embodiments 1 and 2 is verified in conjunction with FIG. 4 and FIG. 5, as described below.
  • the verification experiment of the present invention uses the same optical fiber 151 to demodulate the two-dimensional strain change value ⁇ ⁇ by the two-dimensional strain sensing device and method proposed in the present invention.
  • an optical fiber 151 is affixed to the plate to be measured 152 by an Archimedes spiral type, and a pressure is applied to the measuring plate 152 by a weight.
  • the true strain change value on the plate 152 to be measured can be obtained from the weight applied to the plate 152 to be measured.
  • the strain change value ⁇ ⁇ is demodulated by the two-dimensional strain sensing device and method proposed in the embodiments of the present invention, and compared with the true strain change value, and the effectiveness of the method is verified by comparing the results.
  • Fig. 5 The schematic results are shown in Fig. 5.
  • the display part is the system detectable area
  • X and Y correspond to the position coordinates
  • the position of the pressed point produces strain, which is reflected in Fig. 5, and it can be seen that Z
  • the Z-axis value of the peripheral position decreases, indicating that the plate 152 to be measured is subjected to the reverse strain due to the pressing action.
  • the embodiment of the present invention performs distributed strain measurement based on the Rayleigh scattering spectrum shift of the single-mode fiber in the optical frequency domain reflection, and uses the Archimedes spiral line type to arrange the optical fiber on the tablet to be measured, and measures the two-dimensional. Strain, realized the second Dimensional strain multi-directional sensing needs.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，包括以下步骤：通过二维应变传感装置进行连续二次测量，对两次本地距离域一维信息进行互相关运算，通过得到的互相关信息获取两次测量对应的一维信息应变变化量；利用阿基米德螺线公式，推导本地距离域一维信息对应待测量平板内的二维角度信息、及曲率半径信息；利用曲率半径信息与二维角度信息，推导二维平面对应位置坐标；将一维信息应变变化量，对应至二维平面对应位置坐标上，得到二维应变信息。该方法通过采用一根光纤测量二维应变，解决了多方向传感不敏感的问题。

Description

一种光频域反射中利用阿基米德螺旋线的光纤铺设方法 技术领域
本发明涉及分布式光纤传感仪器技术领域，尤其涉及一种光频域反射中利用阿基米德螺旋线的光纤铺设方法。
背景技术
高精度、高空间分辨率的分布式应变传感广泛应用于民生、国防安全等多个领域中，如飞行器、航天器、船舶、国防装备、工业设备、桥梁涵洞等重点部位的结构健康监控，光频域反射中利用平行铺设等光纤铺设方法可实现二维空间内的分布式应变传感。但在实际应用中，二维空间内各个方向都可能产生应变，一般光纤铺设方法只能较明显的反映单方向的应变。因此，需要采用新的方法全方位的反映二维应变。
发明内容
本发明提供了一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，本发明克服了现有多方向传感不敏感的问题，采用阿基米德螺旋线形，实现了对二维应变多方向传感的需求，详见下文描述：
一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，所述光纤铺设方法包括以下步骤：
通过二维应变传感装置进行连续二次测量，对两次本地距离域一维信息进行互相关运算，通过得到的互相关信息获取两次测量对应的一维信息应变变化量；
利用阿基米德螺线公式，推导本地距离域一维信息对应待测量平板内的二维角度信息、及曲率半径信息；
利用曲率半径信息与二维角度信息，推导二维平面对应位置坐标；
将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息。
所述本地距离域一维信息的获取步骤具体为：
在二维应变传感装置中由光纤背向瑞利散射形成拍频干涉信号，并对这拍频干涉信号分别进行快速傅里叶变换；
将光频域信息转换到对应各个位置的距离域信息，对距离域信息通过一定宽度的移动 窗依次选取各个位置形成本地距离域一维信息。
所述光纤铺设方法采用阿基米德螺旋线的线型，利用一根光纤测量二维空间的应变。
所述光纤末端无需任何装置。
所述将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息具体为：
Figure PCTCN2016103520-appb-000001
Figure PCTCN2016103520-appb-000002
其中，a为＞0的参数；L为曲线长度。
本发明提供的技术方案的有益效果是：本发明基于光频域反射中光纤瑞利背向散射频率移动进行分布式应变测量，采用阿基米德螺旋线线型于待测量平板上排布光纤，测量二维应变，实现了对二维应变多方向传感的需求；即本发明通过采用一根光纤测量二维应变，即实现了对横、纵方向及其合成方向应变的测量，解决了现有多方向传感不敏感的问题，满足了实际应用中的多种需要。
附图说明
图1是一种光频域反射中利用阿基米德螺旋线的光纤铺设方法的流程图；
图2是根据一维应变距离信息，通过阿基米德螺旋线表达式求解二维应变信息的流程图；
图3为本方法中应用的二维应变传感装置的示意图；
图4为二维应变传感装置的光纤铺设方法的示意图；
图5为实验效果图。
附图中，各标号所代表的部件列表如下：
1：可调谐激光器；  4：1:99光分束器；
11：计算机；  21：调谐信号控制模块；
24：基于辅助干涉仪的时钟触发***；  25：主干涉仪；
2：探测器；  5：第一50:50耦合器；
6：时钟整形电路模块；     7：延迟光纤；
8：第一法拉第转镜；       9：第二法拉第转镜；
10：隔离器；         3：50:50分束器；
12：偏振控制器；  13：环形器；
14：第二50:50耦合器；      15：二维应变传感光纤；
16：第一偏振分束器；  17：第二偏振分束器；
18：第一平衡探测器；       19：第二平衡探测器；
20：采集装置；             21：GPIB(通用接口总线)控制模块；
22：参考臂；   23：测试臂；
151：光纤；           152：待测量平板。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面对本发明实施方式作进一步地详细描述。
实施例1
本发明实施例提供了一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，参见图1，该光纤铺设方法包括以下步骤：
101：通过二维应变传感装置进行连续二次测量，对两次本地距离域一维信息进行互相关运算，通过得到的互相关信息获取两次测量对应的一维信息应变变化量；
102：利用阿基米德螺线公式，推导本地距离域一维信息对应待测量平板内的二维角度信息、及曲率半径信息；
103：利用曲率半径信息与二维角度信息，推导二维平面对应位置坐标；
104：将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息。
其中，步骤101中的本地距离域一维信息的获取步骤具体为：
在二维应变传感装置中由光纤背向瑞利散射形成拍频干涉信号，并对这拍频干涉信号分别进行快速傅里叶变换；
将光频域信息转换到对应各个位置的距离域信息，对距离域信息通过一定宽度的移动窗依次选取各个位置形成本地距离域一维信息。
其中，该光纤铺设方法采用阿基米德螺旋线的线型，利用一根光纤测量二维空间的应变。
进一步地，该光纤末端无需任何装置，简化了操作过程。
综上所述，本发明实施例基于光频域反射中光纤瑞利背向散射频率移动进行分布式应变测量，采用阿基米德螺旋线线型于待测量平板上排布光纤，测量二维应变，实现了对二维应变多方向传感的需求。
实施例2
下面结合图1、图2，以及具体的计算公式对实施例1中的方案进行进一步地介绍，该光纤铺设方法中涉及的参数测量、以及计算均通过二维应变传感装置实现，详见下文描述：
201：在二维应变传感装置中由光纤背向瑞利散射形成拍频干涉信号，并对这拍频干涉信号分别进行快速傅里叶变换，将光频域信息转换到对应各个位置的距离域信息，对距离域信息通过一定宽度的移动窗依次选取各个位置形成本地距离域一维信息；
202：通过二维应变传感装置进行连续二次测量，对两次本地距离域一维信息进行互相关运算，通过得到的互相关信息获取两次测量对应的一维信息应变变化量；
其中，该步骤为本领域技术人员所公知，本发明实施例对具体的操作过程不做赘述。
203：利用阿基米德螺线公式，推导本地距离域一维信息对应待测量平板内的二维角度信息、及曲率半径信息；
204：利用曲率半径信息与二维角度信息，推导二维平面对应位置坐标；
205：将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息。
下面结合具体的计算公式对步骤203至步骤205中的计算原理进行详细的描述：
1)获取阿基米德螺旋线的极坐标参数方程；
由阿基米德螺旋线定义，阿基米德螺旋线的极坐标表示为r＝a*θ，(a＞0)。用参数方程表示为：x＝r*cosθ，y＝r*sinθ。其中r为极径，θ为极角。
2)获取曲线长度的微分，并求取阿基米德螺旋线关于角度的长度公式，由长度公式 求取角度的反函数；
由上一步的参数方程可以得出曲线长度的微分为：
Figure PCTCN2016103520-appb-000003
这时曲线长度函数
Figure PCTCN2016103520-appb-000004
就可以通过对长度微分dl在0到
Figure PCTCN2016103520-appb-000005
进行积分求得；其中
Figure PCTCN2016103520-appb-000006
为光纤于待测量平板上螺旋形成的总角度。
根据积分推导，可求得阿基米德螺旋线关于角度的长度公式为：
Figure PCTCN2016103520-appb-000007
由长度公式，可关于角度
Figure PCTCN2016103520-appb-000008
求其反函数
Figure PCTCN2016103520-appb-000009
3)在所需角度范围内将角度的反函数简化为线性曲线，根据线性曲线求解对应角度范围的反函数；
由于上述函数方程为超越函数，无法求得精确解析解，因此在所需角度范围内根据
Figure PCTCN2016103520-appb-000010
简化为线性曲线
Figure PCTCN2016103520-appb-000011
再对该线性方程求解对应角度范围的反函数
Figure PCTCN2016103520-appb-000012
由于实际运用过程中，需要阿基米德螺旋线圈数有限，因此可设定
Figure PCTCN2016103520-appb-000013
的角度范围为0到100π，可知
Figure PCTCN2016103520-appb-000014
在大部分范围内均远大于1，故可将
Figure PCTCN2016103520-appb-000015
公式化简为：
Figure PCTCN2016103520-appb-000016
又由于，
Figure PCTCN2016103520-appb-000017
在角度范围内，增长性及值均远高于
Figure PCTCN2016103520-appb-000018
故可将
Figure PCTCN2016103520-appb-000019
简化为线性方程
Figure PCTCN2016103520-appb-000020
Figure PCTCN2016103520-appb-000021
经模拟分析，该简化方程与原方程在角度取值范围内，具有较高的一致性。
由
Figure PCTCN2016103520-appb-000022
公式，即可推得
Figure PCTCN2016103520-appb-000023
Figure PCTCN2016103520-appb-000024
4)通过反函数可根据极坐标推得一维长度L对应的二维坐标。
由
Figure PCTCN2016103520-appb-000025
即可根据极坐标推得一维长度L对应的二维坐标x,y：
Figure PCTCN2016103520-appb-000026
Figure PCTCN2016103520-appb-000027
综上所述，本发明实施例基于光频域反射中单模光纤瑞利散射光谱移动进行分布式应变测量，采用阿基米德螺旋线线型于待测量平板上排布光纤，测量二维应变，实现了对二维应变多方向传感的需求。
实施例3
下面结合图3、图4对本发明实施例1和2中用到的二维应变传感装置进行详细的介绍，详见下文描述：
参见图3，该二维应变传感装置包括：可调谐激光器1、1:99光分束器4、计算机11、GPIB控制模块21、基于辅助干涉仪的时钟触发***24、主干涉仪25。
基于辅助干涉仪的时钟触发***24包括：探测器2、第一50:50耦合器5、时钟倍频电路模块6、延迟光纤7、第一法拉第转镜8、第二法拉第转镜9和隔离器10。基于辅助干涉仪的时钟触发***24用于实现等光频间距采样，其目的是抑制光源的非线性扫描。
主干涉仪25包括：50:50分束器3、偏振控制器12、环形器13、第二50:50耦合器14、二维应变传感光纤15、第一偏振分束器16、第二偏振分束器17、第一平衡探测器18、第二平衡探测器19、采集装置20、参考臂22和测试臂23。主干涉仪25是光频域反射仪的核心，其为改进型马赫泽德干涉仪。
GPIB控制模块21输入端与计算机11相连；GPIB控制模块21输出端与可调谐激光器1相连；可调谐激光器1与1:99光分束器4的a端口相连；1:99光分束器4的b端口与隔离器10的一端相连；1:99光分束器4的c端口与50:50分束器3的a端口相连；隔离器10的另一端与第一50:50耦合器5的b端口相连；第一50:50耦合器5的a端口与探测器2的一端相连；第一50:50耦合器5的c端口与第一法拉第转镜8相连；第一50:50耦合器5的d端口通过延迟光纤7与第二法拉第转镜9相连；探测器2的另一端与时钟倍频电路模块6的输入端相连；50:50分束器3的b端口通过参考臂22与偏振控制器12的输入端相连；50:50分束器3的c端口通过测试臂23与环形器13的a端口相连；偏振控制器12的输出端与第二50:50耦合器14的a端口相连；环形器13的b端口与第二50:50耦合器14的b端口相连；环形器13的c端口与二维应变传感光纤15相连；第二50:50耦合器14的c端口与第一偏振分束器16的输入端相连；第二50:50耦合器14的d端口与第二偏振分束器17的输入端相连；第一偏振分束器16的输出端分别与第一平衡探测器18的输入端、第二平衡探测器19的输入端相连；第二偏振分束器17的输出端分别与第一平衡探测器18的输入端、第二平衡探测器19的输入端相连；第一平衡探测器18的输出端与采集 装置20的输入端相连；第二平衡探测器19的输出端与采集装置20的输入端相连；采集装置20的输出端与计算机11相连。
该二维应变传感装置工作时，计算机11通过GPIB控制模块21控制可调谐激光器1，以此控制调谐速度、中心波长、调谐启动等；可调谐激光器1的出射光由1:99光分束器4的a端口进入，并以1:99的比例从1:99光分束器4的b端口经过隔离器10进入第一50:50耦合器5的b端口，光从第一50:50耦合器5的b端口进入，从第一50:50耦合器5的c和d端口出射，分别被两臂的第一法拉第转镜8和第二法拉第转镜9反射，返回到第一50:50耦合器5的c、d端口，两束光在第一50:50耦合器5中发生干涉，从第一50:50耦合器5的a端口输出；第一50：50耦合5器a端口的出射光进入探测器2，探测器2将探测到的光信号转换为干涉拍频信号传输至时钟倍频电路模块6，时钟倍频电路模块6干涉拍频信号整形为方波，整形后的信号传输至采集装置20，作为采集装置20的外部时钟信号。
可调谐激光器1的出射光由1:99光分束器4的a端口进入，从1:99光分束器4的c端口进入50:50分束器3的a端口；经过50：50分束器3从b端口进入参考臂22中的偏振控制器12，从c端口进入测试臂23上的环行器13的a端口；光从环行器13的a端口进入，从环行器13的c端口进入二维应变传感光纤15，而二维应变传感光纤15的背向散射光从环行器13端口c端口进入，从环行器13端口b端口输出；参考臂22中的偏振控制器12输出的参考光通过第二50:50耦合器14的a端口与环行器13上的背向散射光通过第二50:50耦合器14的b端口进行合束，形成拍频干涉并从第二50:50耦合器14的c端口和d端口输出至第一偏振分束器16和第一偏振分束器17，第一偏振分束器16和第一偏振分束器17通过第一平衡探测器18和第二平衡探测器19对应采集两个偏振分束器输出的正交方向的信号光，第一平衡探测器18和第二平衡探测器19将输出的模拟电信号传输至采集装置20，采集装置20在时钟倍频电路模块6形成的外部时钟信号作用下将采集到的模拟电信号传输至计算机11。
GPIB控制模块21用于计算机11通过其控制可调谐激光器1。
可调谐激光器1用于为光频域反射***提供光源，其光频能够进行线性扫描。
隔离器10防止辅助干涉仪中第一50:50耦合器5的b端口的反射光进入激光器。
第一50:50耦合器5用于光干涉。
延迟光纤7用于实现非等臂的拍频干涉，能够根据拍频和延迟光纤长度得到光频。
第一法拉第转镜8和第二法拉第转镜9用于为干涉仪提供反射，且能够消除干涉仪的偏振衰落现象。
偏振控制器12作用是调节参考光偏振态，使其在偏振分束时两个正交方向上光强基本一致。
第二50:50耦合器14完成对信号进行偏振分束，消除偏振衰落噪声的影响。
计算机11对采集装置20采集的干涉信号进行数据处理，实现基于光纤瑞利散射光谱移动量的分布式温度应变传感。
其中，参见图4，本发明实施例中应用到的二维应变传感光纤15由光纤151以及待测量平板152组成。
本发明实施例对光纤151的类型不做限制，待测量平板152可以为任一待测量的平板，本发明实施例对其结构不做限制。
本发明实施例仅以图3、图4中的二维应变传感装置为例进行说明，具体实现时，还可以采用其他型号的二维应变传感装置，本发明实施例对此不做限制。
本发明实施例对各器件的型号除做特殊说明的以外，其他器件的型号不做限制，只要能完成上述功能的器件均可。
实施例4
下面结合图4和图5对实施例1和2中的方案进行可行性验证，详见下文描述：
本发明验证实验为采用同一光纤151，利用本发明中提出的二维应变传感装置和方法解调出二维应变变化值Δε。
参见图4，将一根光纤151按阿基米德螺旋线线型盘绕粘贴于待测量平板152上，利用砝码对待测量平板152施加压力。
待测量平板152上真实的应变变化值可以从施加在待测量平板152上的砝码得到。利用本发明实施例中提出的二维应变传感装置和方法解调出应变变化值Δε，并与真实应变变化值进行比对，通过比对结果来验证本方法的有效性。
示意结果如图5所示，从图5中可以看出，显示部分为***可探测区域，X、Y对应位置坐标，受压迫点的位置产生了应变，反映在图5中，可以看出Z轴值升高，周边位置的Z轴值降低，表明待测量平板152由于压迫作用，使得受压迫点位置的相邻区域产生反向应变。
综上所述，本发明实施例基于光频域反射中单模光纤瑞利散射光谱移动进行分布式应变测量，采用阿基米德螺旋线线型于待测量平板上排布光纤，测量二维应变，实现了对二 维应变多方向传感的需求。
本领域技术人员可以理解附图只是一个优选实施例的示意图，上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (5)

  1. 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，其特征在于，所述光纤铺设方法包括以下步骤：
    通过二维应变传感装置进行连续二次测量，对两次本地距离域一维信息进行互相关运算，通过得到的互相关信息获取两次测量对应的一维信息应变变化量；
    利用阿基米德螺线公式，推导本地距离域一维信息对应待测量平板内的二维角度信息、及曲率半径信息；
    利用曲率半径信息与二维角度信息，推导二维平面对应位置坐标；
    将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息。
  2. 根据权利要求1所述的一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，其特征在于，所述本地距离域一维信息的获取步骤具体为：
    在二维应变传感装置中由光纤背向瑞利散射形成拍频干涉信号，并对这拍频干涉信号分别进行快速傅里叶变换；
    将光频域信息转换到对应各个位置的距离域信息，对距离域信息通过一定宽度的移动窗依次选取各个位置形成本地距离域一维信息。
  3. 根据权利要求1或2所述的一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，其特征在于，所述光纤铺设方法采用阿基米德螺旋线的线型，利用一根光纤测量二维空间的应变。
  4. 根据权利要求1或2所述的一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，其特征在于，所述光纤末端无需任何装置。
  5. 根据权利要求1或2所述的一种光频域反射中利用阿基米德螺旋线的光纤铺设方法，其特征在于，所述将一维信息应变变化量，对应至二维平面对应位置坐标上，即得到二维应变信息具体为：
    Figure PCTCN2016103520-appb-100001
    Figure PCTCN2016103520-appb-100002
    其中，a为＞0的参数；L为曲线长度。
PCT/CN2016/103520 2016-06-24 2016-10-27 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法 WO2017219568A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/565,682 US20190121048A1 (en) 2016-06-24 2016-10-26 Optical fiber laying method by using archimedes spiral in optical frequency domain reflection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610487752.4 2016-06-24
CN201610487752.4A CN106197303B (zh) 2016-06-24 2016-06-24 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US15/317,118 A-371-Of-International US10197890B2 (en) 2016-02-18 2016-10-25 Array imaging module and molded photosensitive assembly, circuit board assembly and manufacturing methods thereof for electronic device
US16/157,082 Division US10670946B2 (en) 2016-02-18 2018-10-10 Array imaging module and molded photosensitive assembly, circuit board assembly and manufacturing methods thereof for electronic device

Publications (1)

Publication Number Publication Date
WO2017219568A1 true WO2017219568A1 (zh) 2017-12-28

Family

ID=57461689

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/103520 WO2017219568A1 (zh) 2016-06-24 2016-10-27 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法

Country Status (3)

Country Link
US (1) US20190121048A1 (zh)
CN (1) CN106197303B (zh)
WO (1) WO2017219568A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109356576B (zh) * 2018-10-23 2022-05-03 中国石油化工股份有限公司 测量平面径向流驱替压力梯度的物模实验装置
CN113218320B (zh) * 2021-05-06 2022-01-28 山东大学 一种基于距离域补偿的ofdr大应变测量方法
CN114343839A (zh) * 2021-12-30 2022-04-15 德州环球之光医疗科技有限公司 一种基于可调的螺旋线型激光光斑的治疗图形转换方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071323A (ja) * 2000-08-29 2002-03-08 Mitsubishi Cable Ind Ltd 面状センサ
WO2005080913A1 (en) * 2004-02-23 2005-09-01 Fiberson Ab Fiber/optcal sensor
CN101865665A (zh) * 2010-04-06 2010-10-20 西安金和光学科技有限公司 光纤型弯曲参量的测定装置及方法
CN105021330A (zh) * 2015-07-30 2015-11-04 天津大学 碳纤维增强型智能钢绞线、预应力监测装置及方法
CN105203228A (zh) * 2015-10-27 2015-12-30 成都瑞莱杰森科技有限公司 一种分布式光纤拉曼温度***的解调方法及装置
CN105352446A (zh) * 2015-11-30 2016-02-24 上海交通大学 亚纳应变级多点复用光纤光栅准静态应变传感***

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31032E (en) * 1979-04-30 1982-09-21 Suntime, Inc. Solar water heater
US7275562B2 (en) * 2001-10-17 2007-10-02 Agilent Technologies, Inc. Extensible spiral for flex circuit
KR20080066443A (ko) * 2007-01-12 2008-07-16 이두영 컴퓨터 프로그래밍을 이용한 거미그물 구조 모델링 방법
DE102009047802B4 (de) * 2009-09-30 2012-07-05 Siemens Aktiengesellschaft Vorrichtung zum Filtern eines oder mehrerer nachzuweisender Partikel aus einem Fluid
US8294879B2 (en) * 2010-11-15 2012-10-23 Raytheon Company Multi-directional active sensor
CN104798254B (zh) * 2012-11-15 2017-06-16 3M创新有限公司 用于分布式无线通信***的螺旋天线
EP3011490B1 (en) * 2013-06-18 2018-09-26 Intuitive Surgical Operations, Inc. Methods and apparatus segmented calibration of a sensing optical fiber
US9797795B2 (en) * 2013-10-29 2017-10-24 Intuitive Surgical Operations, Inc. Distributed pressure measurement by embedded fiber optic strain sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071323A (ja) * 2000-08-29 2002-03-08 Mitsubishi Cable Ind Ltd 面状センサ
WO2005080913A1 (en) * 2004-02-23 2005-09-01 Fiberson Ab Fiber/optcal sensor
CN101865665A (zh) * 2010-04-06 2010-10-20 西安金和光学科技有限公司 光纤型弯曲参量的测定装置及方法
CN105021330A (zh) * 2015-07-30 2015-11-04 天津大学 碳纤维增强型智能钢绞线、预应力监测装置及方法
CN105203228A (zh) * 2015-10-27 2015-12-30 成都瑞莱杰森科技有限公司 一种分布式光纤拉曼温度***的解调方法及装置
CN105352446A (zh) * 2015-11-30 2016-02-24 上海交通大学 亚纳应变级多点复用光纤光栅准静态应变传感***

Also Published As

Publication number Publication date
CN106197303A (zh) 2016-12-07
US20190121048A1 (en) 2019-04-25
CN106197303B (zh) 2017-09-29

Similar Documents

Publication Publication Date Title
WO2017166801A1 (zh) 基于光频域反射的分布式应变温度同时测量装置及方法
Theodosiou et al. Accurate and fast demodulation algorithm for multipeak FBG reflection spectra using a combination of cross correlation and Hilbert transformation
CN105466349B (zh) 一种光频域反射中用薄包层光纤提高应变测量灵敏度方法
CN105783999B (zh) 一种光频域反射中参考光纤消除温度应变交叉敏感方法
CN112923960B (zh) 用于校正非线性调谐效应的光纤参数测量装置
Shao et al. OFDR with local spectrum matching method for optical fiber shape sensing
WO2017219568A1 (zh) 一种光频域反射中利用阿基米德螺旋线的光纤铺设方法
Qu et al. Internet of things infrastructure based on fast, high spatial resolution, and wide measurement range distributed optic-fiber sensors
CN105716755A (zh) 一种基于Loyt-Sagnac干涉仪的灵敏度增强型传感器
CN113465528A (zh) 基于光频域反射高速分布式应变测量***和方法
CN107782696B (zh) 利用拉锥光纤测量分布式液体折射率的传感***及方法
Li et al. Integrated fiber-optic Fabry–Perot vibration/acoustic sensing system based on high-speed phase demodulation
CN104848879A (zh) 基于线性工作匹配光栅法的光纤布拉格光栅传感器信号解调方法
EP3889560B1 (en) Phase measurement method, signal processing device, and program
CN113607074B (zh) 一种光频域反射中基于重叠窗口的应变传感解调方法
CN108489640B (zh) 一种基于白光干涉的分布式动态应力频率测量方法
CN113607075B (zh) 一种基于自适应时延估计的光频域反射应变解调方法
Hou et al. Improved path imbalance measurement of a fiber-optic interferometer based on frequency scanning interferometry
Jang et al. High-accuracy distributed bend sensor eligible for high-curvature structures based on Brillouin optical correlation domain analysis
Li et al. Research on large range OFDR distributed temperature sensing technology based on frequency sampling and moving reference spectral method
Cubik et al. Interferometric sensor based on the polarization-maintaining fibers
Wang et al. High sensitivity distributed static strain sensing based on all grating optical fiber in optical frequency domain reflectometry
Lin et al. Low-coherence phase-shifting shearing interferometer for measuring parallelism of parallel surfaces of transparent samples
Lucki et al. Fiber Optic and Free Space Michelson Interferometer—Principle and Practice
Cui et al. Distributed Optical Fiber Sensing Measurement Based on Time Offset

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16906108

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16906108

Country of ref document: EP

Kind code of ref document: A1