CN103743463A - Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium - Google Patents
Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium Download PDFInfo
- Publication number
- CN103743463A CN103743463A CN201310749018.7A CN201310749018A CN103743463A CN 103743463 A CN103743463 A CN 103743463A CN 201310749018 A CN201310749018 A CN 201310749018A CN 103743463 A CN103743463 A CN 103743463A
- Authority
- CN
- China
- Prior art keywords
- fiber grating
- optical fiber
- liquid medium
- double optical
- vibration transducer
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Abstract
The invention discloses a dual-FBG (Fiber Bragg Grating) vibrating sensor used for a liquid medium. The dual-FBG vibrating sensor is characterized by comprising a shell, a first FBG, a second FBG, a transmission optical fiber, a mass block, an L-shaped cantilever beam, a spring piece and a supporting fastener, wherein the first FBG and the second FBG are connected in series and are respectively connected with the shell through one end of the L-shaped cantilever beam, and the other end of the L-shaped cantilever beam is connected with the mass block; the L-shaped cantilever beam is fixedly arranged on the shell by virtue of the spring piece. The dual-FBG vibrating sensor used for the liquid medium has self temperature compensation, and can be used for not only automatically eliminating influences of changes of environmental factors such as external temperature but also improving the detection flexibility and working band of the FBG vibrating sensor applied to vibration measurement.
Description
Technical field
The present invention relates to sensory field of optic fibre, be specifically related to a kind of double optical fiber grating vibration acceleration sensor with temperature self-compensation, gold-plated sealing and waterproofing design, be applicable to the vibration survey of liquid medium medium-high frequency.
Background technology
Important Project equipment running status parameter is carried out the fault type of Real-Time Monitoring, timely identification equipment and assessed its usability and life-span, the disastrous fault that may occur is given warning in advance, set up accordingly corresponding safe early warning mechanism, not only can raising equipment the safe reliability of operation, can also reduce the O&M cost of equipment.Vibration is the important characterization parameter of equipment running status, vibration survey generally includes the dynamic parameters such as the displacement, speed, acceleration of vibration, acceleration has reflected the essential characteristic of object vibration, from acceleration signal, can extract relevant information can be used for assessment apparatus running status such as frequency, displacement etc., therefore, vibration monitoring has a good application prospect at engineering field.
For some special applications, as the safety monitoring of the equipment such as Aero-Space, petrochemical complex, bridge dam, electric system, traditional vibration monitoring method is the most ripe with electric mensuration, but its restricted application, wiring is inconvenient and be subject to electromagnetic environment interference, especially can not be applied to the measurement of vibrating in liquid medium.
Fiber-optic grating sensor have anti-electromagnetic interference (EMI), high sensitivity, great dynamic range, size little, easily imbed, utilize multiplex technique easily to realize the advantages such as single fiber multiple spot, networking measurement, for vibration equipment monitoring, especially in liquid medium, vibration survey provides new approach.
Summary of the invention
Technical matters to be solved by this invention is: for solving liquid medium ambient vibration, measure problem, and a kind of double optical fiber grating vibration acceleration sensor for liquid medium with temperature self-compensation is provided.
The technical solution adopted in the present invention is: a kind of double optical fiber grating vibration transducer for liquid medium, it is characterized in that, comprising: shell, the first fiber grating, the second fiber grating, Transmission Fibers, mass, L-type semi-girder, spring leaf, support securing member; Described the first fiber grating and the series connection of the second fiber grating, and by one end of L-type semi-girder, be connected with shell respectively, the other end of L-type semi-girder is connected with mass, and L-type semi-girder is fixed on shell by spring leaf.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described the first fiber grating and the second fiber grating are connected between shell and L-type semi-girder and impose prestress.The technique effect bringing is thus: make fiber grating on its axis, be subject to all the time the effect of the homogeneous state of stress, avoid the broadening of its reflection peak, to obtain larger measurement range.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described L-type semi-girder end face is rectangular configuration, and its width is much larger than thickness.The technique effect bringing is thus: have larger bendind rigidity, to reduce transverse axis, crosstalk.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described spring leaf can provide certain overload protection.The technique effect bringing is thus: avoid sensor to cause device failure because of the excessive outrange of dynamic excitation, can eliminate the transverse axis cross-interference issue of sensor simultaneously.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described double optical fiber grating vibration transducer adopts two fiber grating series windings, and composition double grating structure, measures the vibration in a dimension.The technique effect bringing is thus: this structure not only can realize the auto-compensation of temperature, but also can obtain the sensitivity higher than monochromatic light grid and working frequency range.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described three groups of double optical fiber grating vibration transducers are combined into three-axis structure, can realize the measurement of three-dimensional vibrating acceleration.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described double optical fiber grating vibration transducer adopts packed by metal casing gold-plated processing, realizes waterproof and sealing.The technique effect bringing is thus: avoid the impact of liquid medium damping on double optical fiber grating vibration transducer sensing capabilities.
Double optical fiber grating vibration transducer for liquid medium as above, is characterized in that, described branched fiber-optic grating sensor utilizes wavelength-division/sky point hybrid multiplex technology groups forming fibre-optic grating sensing network.The technique effect bringing is thus: can utilize to greatest extent the load-bearing capacity of the every passage of demodulating system, save wiring installation cost and system cost.
The invention has the beneficial effects as follows: the double optical fiber grating vibration acceleration sensor for liquid medium with temperature self-compensation, not only automatically eliminate the impact that the environmental factors such as ambient temperature change, also improved detection sensitivity and the working band of optical fibre grating acceleration sensor for vibration survey; Gold-plated sealing and waterproofing design, be applicable to the vibration survey of liquid medium medium-high frequency; Wavelength-division/the sky of fiber grating point hybrid multiplex, for three-dimensional vibrating acceleration analysis and networking measurement lay the foundation.
Accompanying drawing explanation
Fig. 1 is the double optical fiber grating vibration transducer structural representation of the embodiment of the present invention.
Embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
Symbol description in accompanying drawing: 1-shell, 2-the first fiber grating, 3-the second fiber grating, 4-Transmission Fibers, 5-mass, 6-L type semi-girder, 7-spring leaf, 8-support securing member.
As shown in Figure 1, the technical solution adopted in the present invention is: a kind of double optical fiber grating vibration transducer for liquid medium, comprising: shell 1, the first fiber grating 2, the second fiber grating 3, Transmission Fibers 4, mass 5, L-type semi-girder 6, spring leaf 7, support securing member 8 etc.; Described the first fiber grating 2 and the second fiber grating 3 are connected, and by one end of L-type semi-girder 6, are connected with shell 1 respectively, and the other end of L-type semi-girder 6 is connected with mass 5, and L-type semi-girder 6 is fixed on shell 1 by spring leaf 7.
Described the first fiber grating and the second fiber grating are connected between shell and L-type semi-girder and impose prestress, make fiber grating on its axis, be subject to all the time the effect of the homogeneous state of stress, avoid the broadening of its reflection peak, to obtain larger measurement range.
Described L-type semi-girder end face is rectangular configuration, and its width, much larger than thickness, has larger bendind rigidity, to reduce transverse axis, crosstalks.
Described spring leaf can provide certain overload protection, avoids sensor to cause device failure because of the excessive outrange of dynamic excitation, can eliminate the transverse axis cross-interference issue of sensor simultaneously.
Described double optical fiber grating vibration transducer adopts two fiber grating series windings, and composition double grating structure, measures the vibration in a dimension, and this structure not only can realize the auto-compensation of temperature, but also can obtain the sensitivity higher than monochromatic light grid and working frequency range.
Described three groups of double optical fiber grating vibration transducers are combined into three-axis structure, can realize the measurement of three-dimensional vibrating acceleration.
Described double optical fiber grating vibration transducer adopts packed by metal casing gold-plated processing, realizes waterproof and sealing, avoids the impact of liquid medium damping on double optical fiber grating vibration transducer sensing capabilities.
Described branched fiber-optic grating sensor utilizes wavelength-division/sky point hybrid multiplex technology groups forming fibre-optic grating sensing network, can utilize to greatest extent the load-bearing capacity of the every passage of demodulating system, saves wiring installation cost and system cost.
Know-why of the present invention is: optical fibre grating acceleration sensor consists of quality-spring system, while carrying out vibration survey, sensor outer housing 1 is fixed on object under test, extraneous vibration makes, between sensor outer housing 1 and inertial mass 5, relative motion occurs, by L-type semi-girder 6, act on the first fiber grating 2 and the second fiber grating 3, make fiber grating axially be subject to the effect of stress and produce stretching or compression at it, the first fiber grating 2 and the second fiber grating 3 be alternately conversion in stretching and compressing, and its fiber bragg grating center wavelength drifts about thereupon.Size and change frequency by detection fiber raster center wavelength shift can be realized the measurement to vibration acceleration.
Above-mentioned double optical fiber grating acceleration transducer, is characterized in that, the first fiber grating 2 and the second fiber grating 3 are complete same grating and along the upper end full symmetric of L-type semi-girder 6, arrange i.e. centre wavelength
, temperature coefficient
and the coefficient of strain
all identical,, when mass 5 vibration downwards, the first fiber grating 2 is stretched, and the second fiber grating 3 is compressed, and its wavelength variable quantity is respectively:
In formula,
be the wavelength variable quantity of the first fiber grating 2,
the wavelength variable quantity of the second fiber grating 3,
for temperature variation,
for vibrating the strain variation amount causing.Above-mentioned two formulas are added the variable quantity that can obtain temperature, and above-mentioned two formulas are subtracted each other the variable quantity that can obtain strain:
Said method has not only been realized the temperature self-compensation that vibration acceleration is measured, and also can realize the independent measurement of temperature, and have higher detection sensitivity.
Described double optical fiber grating vibration transducer can be considered single-degree-of-freedom undamped system, and its kinematical equation can be expressed as:
In formula,
yfor the displacement of mass 5 opposite shell 1;
for the displacement over the ground of shell,
;
for the quality of mass;
for system stiffness,
.
Double optical fiber grating vibration transducer is in its frequency of operation during steady operation, and the strain that fiber grating is subject to is:
By theory of the fiber optical, had
, have
Wherein,
for wavelength variable quantity,
for the elasto-optical coefficient of fiber grating, the sensitivity coefficient of sensor is:
K=
These are only embodiments of the invention, be not limited to the present invention, therefore, within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (7)
1. for a double optical fiber grating vibration transducer for liquid medium, it is characterized in that, comprising: shell, the first fiber grating, the second fiber grating, Transmission Fibers, mass, L-type semi-girder, spring leaf, support securing member; Described the first fiber grating and the series connection of the second fiber grating, and by one end of L-type semi-girder, be connected with shell respectively, the other end of L-type semi-girder is connected with mass, and L-type semi-girder is fixed on shell by spring leaf.
2. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described the first fiber grating and the second fiber grating are connected between shell and L-type semi-girder and impose prestress.
3. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described L-type semi-girder end face is rectangular configuration, and its width is much larger than thickness.
4. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described double optical fiber grating vibration transducer adopts two fiber grating series windings, and composition double grating structure, measures the vibration in a dimension.
5. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described three groups of double optical fiber grating vibration transducers are combined into three-axis structure, can realize the measurement of three-dimensional vibrating acceleration.
6. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described double optical fiber grating vibration transducer adopts packed by metal casing gold-plated processing, realizes waterproof and sealing.
7. the double optical fiber grating vibration transducer for liquid medium according to claim 1, is characterized in that, described branched fiber-optic grating sensor utilizes wavelength-division/sky point hybrid multiplex technology groups forming fibre-optic grating sensing network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310749018.7A CN103743463A (en) | 2013-12-31 | 2013-12-31 | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310749018.7A CN103743463A (en) | 2013-12-31 | 2013-12-31 | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103743463A true CN103743463A (en) | 2014-04-23 |
Family
ID=50500503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310749018.7A Pending CN103743463A (en) | 2013-12-31 | 2013-12-31 | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103743463A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387275A (en) * | 2017-08-04 | 2019-02-26 | 菲布雷格光电科技（湖北）有限公司 | Optical fibre grating acceleration sensor based on flexible hinge |
| CN110017890A (en) * | 2019-05-14 | 2019-07-16 | 广西师范大学 | A method of improving edge filter demodulation method linear demodulation region |
| CN111174897A (en) * | 2020-01-16 | 2020-05-19 | 西安石油大学 | Cantilever beam type two-dimensional fiber grating vibration sensor |
| CN111239438A (en) * | 2020-02-24 | 2020-06-05 | 山东省科学院激光研究所 | Optical fiber grating acceleration sensor |
| CN112729399A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Liquid-gas pressure and liquid-gas vibration sensor and preparation method thereof |
| CN113514087A (en) * | 2021-03-11 | 2021-10-19 | 武汉理工大学 | Fiber grating sensor for measuring wind pressure and vibration |
| CN114608432A (en) * | 2022-05-16 | 2022-06-10 | 深圳市城市交通规划设计研究中心股份有限公司 | Bridge deformation monitoring device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004012280A (en) * | 2002-06-06 | 2004-01-15 | Tokyo Gas Co Ltd | Optical fiber vibration sensor and vibration measuring method |
| CN2856950Y (en) * | 2005-12-05 | 2007-01-10 | 同济大学 | Fiber glass raster low frequeney oscillation senser for civil engineering |
| CN103134581A (en) * | 2013-01-30 | 2013-06-05 | 中国人民解放军国防科学技术大学 | Push-pull type fiber laser vector hydrophone |
| CN203785779U (en) * | 2013-12-31 | 2014-08-20 | 国家电网公司 | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium |
-
2013
- 2013-12-31 CN CN201310749018.7A patent/CN103743463A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004012280A (en) * | 2002-06-06 | 2004-01-15 | Tokyo Gas Co Ltd | Optical fiber vibration sensor and vibration measuring method |
| CN2856950Y (en) * | 2005-12-05 | 2007-01-10 | 同济大学 | Fiber glass raster low frequeney oscillation senser for civil engineering |
| CN103134581A (en) * | 2013-01-30 | 2013-06-05 | 中国人民解放军国防科学技术大学 | Push-pull type fiber laser vector hydrophone |
| CN203785779U (en) * | 2013-12-31 | 2014-08-20 | 国家电网公司 | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium |
Non-Patent Citations (1)
| Title |
|---|
| 孙汝蛟等: "一种新型光纤布喇格光栅振动传感器研究", 《光子学报》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387275A (en) * | 2017-08-04 | 2019-02-26 | 菲布雷格光电科技（湖北）有限公司 | Optical fibre grating acceleration sensor based on flexible hinge |
| CN110017890A (en) * | 2019-05-14 | 2019-07-16 | 广西师范大学 | A method of improving edge filter demodulation method linear demodulation region |
| CN111174897A (en) * | 2020-01-16 | 2020-05-19 | 西安石油大学 | Cantilever beam type two-dimensional fiber grating vibration sensor |
| CN111239438A (en) * | 2020-02-24 | 2020-06-05 | 山东省科学院激光研究所 | Optical fiber grating acceleration sensor |
| CN112729399A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Liquid-gas pressure and liquid-gas vibration sensor and preparation method thereof |
| CN112729399B (en) * | 2020-12-25 | 2023-03-14 | 武汉理工大学 | Liquid-gas pressure and liquid-gas vibration sensor and preparation method thereof |
| CN113514087A (en) * | 2021-03-11 | 2021-10-19 | 武汉理工大学 | Fiber grating sensor for measuring wind pressure and vibration |
| CN113514087B (en) * | 2021-03-11 | 2024-05-07 | 武汉理工大学 | Fiber bragg grating sensor for measuring wind pressure and vibration |
| CN114608432A (en) * | 2022-05-16 | 2022-06-10 | 深圳市城市交通规划设计研究中心股份有限公司 | Bridge deformation monitoring device and method |
| CN114608432B (en) * | 2022-05-16 | 2022-08-23 | 深圳市城市交通规划设计研究中心股份有限公司 | Bridge deformation monitoring device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103743463A (en) | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium | |
| CN203785779U (en) | Dual-FBG (Fiber Bragg Grating) vibrating sensor used for liquid medium | |
| CN101982740B (en) | Optical fiber grating vibration sensor comprising double cantilever beams with equal strength | |
| Gholamzadeh et al. | Fiber optic sensors | |
| CN106680535B (en) | The differential-type optical accelerometer of laser beat frequency is realized based on Fiber Bragg Grating Reflective Spectrum Characteristics | |
| CN108168728A (en) | Non-equilibrium polarization maintaining optical fibre dual interferometer temperature strain simultaneous measuring apparatus and method | |
| CN103983806A (en) | Fiber bragg grating high-frequency acceleration sensor based on flexible hinges | |
| CN102981020A (en) | Optical fiber grating temperature self-compensating acceleration sensor | |
| CN104848980A (en) | Bridge stay cable force online detection method and system based on fiber sensing | |
| CN105181108A (en) | Optical fiber grating earth sound sensing probe and sensing system | |
| CN105387923A (en) | Great-angle tilted fiber bragg grating mechanical vibration sensing array and system | |
| CN103674083A (en) | High-speed particle impact test system | |
| CN104807536A (en) | Fiber Bragg grating two-dimensional vibration sensor with temperature compensation | |
| CN102840908A (en) | Vibration sensor of three-component fiber grating | |
| CN101441103A (en) | Optical fiber vibration sensor | |
| CN202734839U (en) | Portable fiber grating wavelength demodulation instrument | |
| Qin et al. | Quasi-distributed vibration sensing system for transformers using a phase-sensitive OFDR | |
| CN106092304A (en) | For monitoring the distributed optical fiber vibration sensor system of blasting vibration | |
| CN103743464A (en) | Oil-immersed transformer vibration on-line monitoring system with built-in optical fiber grating sensor | |
| US20160202285A1 (en) | Accelerometer Based on Two-Mode Elliptical-Core Fiber Sensor | |
| CN103245304A (en) | Angle sensor provided with temperature compensation optical fibers and used for measuring level angle of pole tower | |
| CN203772406U (en) | Oil-immersed type transformer vibration online monitoring system with built-in fiber grating sensor | |
| CN204881836U (en) | Fiber grating earthquake sounds sensing probe | |
| CN108061522A (en) | Distribution type fiber-optic Bragg grating MISSILE LAUNCHING case strain monitoring system | |
| CN101441105A (en) | Optical fiber vibration sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140423 |