CN106679860A - Transverse pressure sensors based on TFBG - Google Patents
Transverse pressure sensors based on TFBG Download PDFInfo
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- CN106679860A CN106679860A CN201710163661.XA CN201710163661A CN106679860A CN 106679860 A CN106679860 A CN 106679860A CN 201710163661 A CN201710163661 A CN 201710163661A CN 106679860 A CN106679860 A CN 106679860A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 239000013013 elastic material Substances 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 8
- 238000005253 cladding Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000003595 spectral effect Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/243—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
本发明公开了一种基于TFBG的横向压力传感器，由宽带光源，光谱仪，3db耦合器，传感器，第一金属片，第一弹性材料，第一支撑光纤，TFBG，第二支撑光纤，第二金属片，第二弹性材料，Au膜组成。宽带光源发出的光经过传输光纤进入3db耦合器的端口1，从3db耦合器的端口2出来进入传感器中的TFBG，激发出大量的向后传输的包层模与前向传输的纤芯模，前向传输的纤芯模继续向前传输至镀有Au膜的端面，此时光被反射回去，光从3db耦合器的端口2进入，从3db耦合器的端口3出来，光谱仪检测光谱信号的变化，当在TFBG的光栅区施加沿着垂直光纤的轴向方向压力的时候，光谱仪检测到的光谱经过FFT变换，参照附图4并且观察FFT谱的变化即可完成对压力的检测。
The invention discloses a TFBG-based lateral pressure sensor, which consists of a broadband light source, a spectrometer, a 3db coupler, a sensor, a first metal sheet, a first elastic material, a first supporting optical fiber, TFBG, a second supporting optical fiber, and a second metal sheet, the second elastic material, and Au film. The light emitted by the broadband light source enters port 1 of the 3db coupler through the transmission fiber, exits from port 2 of the 3db coupler and enters the TFBG in the sensor, and excites a large number of cladding modes that travel backward and core modes that travel forward. The forward-transmitted core mode continues to transmit forward to the end face coated with Au film. At this time, the light is reflected back. The light enters from port 2 of the 3db coupler and comes out from port 3 of the 3db coupler. The spectrometer detects the change of the spectral signal , when the grating region of the TFBG is applied with pressure along the axial direction of the vertical fiber, the spectrum detected by the spectrometer undergoes FFT transformation. Refer to Figure 4 and observe the change of the FFT spectrum to complete the detection of the pressure.
Description
本发明属于光纤传感技术领域，具体涉及一种基于TFBG的横向压力传感器技术领域。The invention belongs to the technical field of optical fiber sensing, in particular to the technical field of a TFBG-based lateral pressure sensor.
背景技术Background technique
在各种类型的压力传感器中，光纤Bragg光栅(FBG)压力传感器由于设计灵活、抗电磁干扰等优点受到关注，其轻巧和易于复用的特性使得它非常适合埋入被测材料的内部构成智能结构。Among various types of pressure sensors, the fiber Bragg grating (FBG) pressure sensor has attracted attention due to its advantages of flexible design and anti-electromagnetic interference. structure.
目前，大多数FBG横向压力传感器是基于应力致双折射原理实现对横向压力的传感测量，利用TFBG反射光谱特性测量横向压力比以前的方法都要精准。At present, most FBG lateral pressure sensors are based on the principle of stress-induced birefringence to realize the sensing and measurement of lateral pressure, and the use of TFBG reflection spectrum characteristics to measure lateral pressure is more accurate than previous methods.
发明内容Contents of the invention
针对现有技术的不足，本发明的目的在于提供一种基于TFBG的横向压力传感器，通过观察FFT峰值的变化来对横向压力进行检测，该结构易于集成，便于实现。Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a TFBG-based lateral pressure sensor, which detects the lateral pressure by observing the change of the FFT peak value, and the structure is easy to integrate and realize.
本发明通过以下技术方案实现：一种基于TFBG的横向压力传感器，由宽带光源(1)，光谱仪(2)，3db耦合器(3)，传感器(4)，第一金属片(5)，第一弹性材料(6)，第一支撑光纤(7)，TFBG(8)，第二支撑光纤(9)，第二金属片(10)，第二弹性材料(11)，Au膜(12)组成，其特征在于：宽带光源(1)与光谱仪(2)分别接在3db耦合器(3)的端口1和端口3上，3db耦合器(3)的端口2通过传输光纤连接传感器(4)。The present invention is realized through the following technical scheme: a kind of lateral pressure sensor based on TFBG, consists of broadband light source (1), spectrometer (2), 3db coupler (3), sensor (4), the first metal sheet (5), the second An elastic material (6), a first supporting optical fiber (7), a TFBG (8), a second supporting optical fiber (9), a second metal sheet (10), a second elastic material (11), and an Au film (12) , characterized in that: the broadband light source (1) and the spectrometer (2) are respectively connected to port 1 and port 3 of the 3db coupler (3), and the port 2 of the 3db coupler (3) is connected to the sensor (4) through a transmission fiber.
所述的传感器(4)由TFBG(8)和第一金属片(5)，第一弹性材料(6)，第一支撑光纤(7)，第二支撑光纤(9)，第二金属片(10)，第二弹性材料(11)构成夹层结构。Described sensor (4) is made of TFBG (8) and the first metal sheet (5), the first elastic material (6), the first supporting optical fiber (7), the second supporting optical fiber (9), the second metal sheet ( 10), the second elastic material (11) forms a sandwich structure.
所述的TFBG(8)倾角为4°，长为5mm，在光栅区一侧距光栅尾部0.5cm处垂直切断光纤，在端面镀上Au膜(12)。The TFBG (8) has an inclination angle of 4° and a length of 5 mm. The optical fiber is cut vertically at 0.5 cm from the tail of the grating on one side of the grating area, and an Au film (12) is plated on the end face.
本发明的工作原理是：宽带光源(1)发出的光经过传输光纤进入3db耦合器(3)的端口1，从3db耦合器(3)的端口2出来进入传感器(4)中的TFBG(8)，激发出大量的向后传输的包层模与前向传输的纤芯模，前向传输的纤芯模继续向前传输至镀有Au膜(12)的端面，此时光被反射回去，光从3db耦合器(3)的端口2进入，从3db耦合器(3)的端口3出来，光谱仪(2)检测光谱信号的变化，当在TFBG(8)的光栅区施加沿着垂直光纤的轴向方向压力的时候，压力通过第一金属片(5)和第二金属片(10)以及第一弹性材料(6)，第二弹性材料(11)，第一支撑光纤(7)，第二支撑光纤(9)组成的夹层结构，光谱仪(2)检测到的光谱经过FFT变换(快速傅立叶变换)，参照附图4并且观察FFT谱的变化即可完成对压力的检测。The working principle of the present invention is: the light sent by the broadband light source (1) enters the port 1 of the 3db coupler (3) through the transmission fiber, and enters the TFBG (8) in the sensor (4) from the port 2 of the 3db coupler (3) ), a large number of cladding modes and forward-transporting core modes are excited, and the forward-transmitting core modes continue to transmit forward to the end face coated with the Au film (12), and the light is reflected back at this time, Light enters from port 2 of the 3db coupler (3) and exits from port 3 of the 3db coupler (3). The spectrometer (2) detects changes in the spectral signal. When the axial direction is pressed, the pressure passes through the first metal sheet (5) and the second metal sheet (10) and the first elastic material (6), the second elastic material (11), the first supporting optical fiber (7), the second The sandwich structure composed of two supporting optical fibers (9), the spectrum detected by the spectrometer (2) undergoes FFT transform (fast Fourier transform), and the pressure detection can be completed by referring to accompanying drawing 4 and observing the change of the FFT spectrum.
本发明的有益效果是：采用了FFT变换可以避免光源功率的抖动及环境温度对横向压力测量的影响，为光纤横向压力传感器提供了一种切实可行的方案，简单易行，方便可靠。The beneficial effects of the present invention are: the use of FFT transformation can avoid the jitter of the light source power and the influence of the ambient temperature on the lateral pressure measurement, and provide a practical solution for the optical fiber lateral pressure sensor, which is simple, convenient and reliable.
附图说明Description of drawings
图1是一种基于TFBG的横向压力传感器的系统图。Figure 1 is a system diagram of a TFBG-based lateral pressure sensor.
图2是一种基于TFBG的横向压力传感器的传感部位截面图。Fig. 2 is a cross-sectional view of a sensing part of a TFBG-based lateral pressure sensor.
图3是一种基于TFBG的横向压力传感器的TFBG镀膜图。Figure 3 is a TFBG coating diagram of a TFBG-based lateral pressure sensor.
图4是一种基于TFBG的横向压力传感器的FFT谱。Figure 4 is an FFT spectrum of a TFBG-based lateral pressure sensor.
具体实施方式detailed description
下面结合附图与具体实施方式对本发明作进一步详细描述。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
参见附图1，2，3，4，一种基于TFBG的横向压力传感器，由宽带光源(1)，光谱仪(2)，3db耦合器(3)，传感器(4)，第一金属片(5)，第一弹性材料(6)，第一支撑光纤(7)，TFBG(8)，第二支撑光纤(9)，第二金属片(10)，第二弹性材料(11)，Au膜(12)组成，其特征在于：宽带光源(1)与光谱仪(2)分别接在3db耦合器(3)的端口1和端口3上，3db耦合器(3)的端口2通过传输光纤连接传感器(4)；传感器(4)由TFBG(8)和第一金属片(5)，第一弹性材料(6)，第一支撑光纤(7)，第二支撑光纤(9)，第二金属片(10)，第二弹性材料(11)构成夹层结构；TFBG(8)倾角为4°，长为5mm，在光栅区一侧距光栅尾部0.5cm处垂直切断光纤，在端面镀上Au膜(12)。Referring to accompanying drawing 1,2,3,4, a kind of lateral pressure sensor based on TFBG, by broadband light source (1), spectrometer (2), 3db coupler (3), sensor (4), the first metal plate (5 ), the first elastic material (6), the first supporting optical fiber (7), TFBG (8), the second supporting optical fiber (9), the second metal sheet (10), the second elastic material (11), Au film ( 12) composition, it is characterized in that: broadband light source (1) and spectrometer (2) are respectively connected on port 1 and port 3 of 3db coupler (3), and port 2 of 3db coupler (3) connects sensor ( 4); sensor (4) is made of TFBG (8) and the first sheet metal (5), the first elastic material (6), the first supporting optical fiber (7), the second supporting optical fiber (9), the second sheet metal ( 10), the second elastic material (11) constitutes a sandwich structure; the TFBG (8) has an inclination angle of 4° and a length of 5mm, cuts the optical fiber vertically at 0.5cm from the tail of the grating on one side of the grating area, and coats the end face with an Au film (12 ).
本发明的工作原理是：宽带光源(1)发出的光经过传输光纤进入3db耦合器(3)的端口1，从3db耦合器(3)的端口2出来进入传感器(4)中的TFBG(8)，激发出大量的向后传输的包层模与前向传输的纤芯模，前向传输的纤芯模继续向前传输至镀有Au膜(12)的端面，此时光被反射回去，光从3db耦合器(3)的端口2进入，从3db耦合器(3)的端口3出来，光谱仪(2)检测光谱信号的变化，当在TFBG(8)的光栅区施加沿着垂直光纤的轴向方向压力的时候，压力通过第一金属片(5)和第二金属片(10)以及第一弹性材料(6)，第二弹性材料(11)，第一支撑光纤(7)，第二支撑光纤(9)组成的夹层结构，光谱仪(2)检测到的光谱经过FFT变换(快速傅立叶变换)，参照附图4并且观察FFT谱的变化即可完成对压力的检测。The working principle of the present invention is: the light sent by the broadband light source (1) enters the port 1 of the 3db coupler (3) through the transmission fiber, and enters the TFBG (8) in the sensor (4) from the port 2 of the 3db coupler (3) ), a large number of cladding modes and forward-transporting core modes are excited, and the forward-transmitting core modes continue to transmit forward to the end face coated with the Au film (12), and the light is reflected back at this time, Light enters from port 2 of the 3db coupler (3) and exits from port 3 of the 3db coupler (3). The spectrometer (2) detects changes in the spectral signal. When the axial direction is pressed, the pressure passes through the first metal sheet (5) and the second metal sheet (10) and the first elastic material (6), the second elastic material (11), the first supporting optical fiber (7), the second The sandwich structure composed of two supporting optical fibers (9), the spectrum detected by the spectrometer (2) undergoes FFT transform (fast Fourier transform), referring to accompanying drawing 4 and observing the changes of the FFT spectrum to complete the pressure detection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109253950A (en) * | 2018-11-28 | 2019-01-22 | 中国计量大学 | A kind of fibre optical sensor measuring surface tension of liquid |
| CN115638909A (en) * | 2022-11-04 | 2023-01-24 | 之江实验室 | A Stiffness Sensor Based on Polymer Optical Fiber Junction Sensitive Structure and Silicone Substrate |
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Application publication date: 20170517 |