CN202066479U - Linear fiber bragg grating displacement meter - Google Patents
Linear fiber bragg grating displacement meter Download PDFInfo
- Publication number
- CN202066479U CN202066479U CN2011200584512U CN201120058451U CN202066479U CN 202066479 U CN202066479 U CN 202066479U CN 2011200584512 U CN2011200584512 U CN 2011200584512U CN 201120058451 U CN201120058451 U CN 201120058451U CN 202066479 U CN202066479 U CN 202066479U
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- fiber grating
- hard core
- optical fiber
- spring
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a linear fiber bragg grating displacement meter, comprising a protection cylinder, a fiber bragg grating, a diaphragm fixing cylinder, a hard core diaphragm, a probe rod guiding cylinder, two O-shaped loops, a probe rod, a spring and an armoured optical cable. The fiber bragg grating and the spring connected with the probe rod are respectively fixed at two ends of the hard core diaphragm and are both disposed on a central axis of the hard core diaphragm. Thus, to-be-measured displacement is converted into relative displacement between the probe rod and the hard core diaphragm, i.e., telescoping amount of the spring, then displacement is converted into changes of spring pulling force applied on the hard core diaphragm, thereby causing micrometric displacement of the diaphragm hard core, the fiber bragg grating is stretched or compressed, thereby causing movement of reflection wave of the fiber bragg grating, and change information of the to-be-measured displacement can be detected by detecting the movement amount of the reflection wave of the fiber bragg grating. The linear fiber bragg grating displacement meter is simple in structure, and high in stability and reliability.
Description
Technical field:
The utility model relates to civil engineering work and sensory field of optic fibre, particularly a kind of orthoscopic Optical Fiber Grating Displacement Meter.
Background technology:
In the monitoring of the work progress of Important Project structures such as bridge, tunnel, dam, underground works, side slope and in the long-term health monitoring of operational process, displacement is, one of a most effective parameter the most basic.At present, displacement meter commonly used in civil engineering work mostly is resistance-strain type displacement meter and type vibration wire displacement meter, all have certain limitation, for example: relatively poor, the anti-thunderbolt ability of anti-electromagnetic interference capability is relatively poor, transmission range is not far, long-time stability and reliability are bad etc.
In recent ten years, along with the fiber grating manufacturing technology increasingly mature, the fiber grating demodulation technology is perfect day by day, more because fiber grating has anti-electromagnetic interference (EMI), anticorrosive, anti-thunderbolt, the direct specific coding of wavelength, is not subjected to that luminous power influence of fluctuations, long-term reliability and good stability, signal long-distance transmit, wavelength-division multiplex networking and plurality of advantages such as can use in inflammable and explosive environment, fiber grating sensing technology is in the ascendant in the application of field of civil engineering, also is applied to more and more in the displacement monitoring field.
Because the length of fiber grating is about about 15mm, about the maximum strain amount 5000 μ ε that it can bear, so the deformation that fiber grating itself can produce is very little.And the required range of displacement measurement of engineering site is at least 10mm, maximum can reach 1m, even it is bigger, therefore, it is not all right directly using fiber grating to make displacement meter, range of displacement measurement that must engineering site is required could satisfy the requirement of engineering practicability by the scope that a deformation quantity that can bear with fiber grating mates that is reduced into of certain structure linearity.Prior art mainly is to adopt beam of uniform strength mode, be about to displacement to be measured and at first be converted into the free-ended displacement of the beam of uniform strength by certain physical construction, thereby cause the deformation of the fiber grating that is bonded in beam of uniform strength surface, and then realize the measurement of displacement to be measured by the amount of movement of measuring optical fiber optical grating reflection wavelength.For example: Chinese patent " Optical Fiber Grating Displacement Meter " (patent No.: ZL 200820079182.6) utilizes wire rope and the ingenious conversion that has realized displacement to be measured and beam of uniform strength free end travel of fixed pulley.In addition, Chinese patent: " Optical Fiber Grating Displacement Meter " (patent No.: ZL 200620021099.4) links together by reversing piece between the spring and the beam of uniform strength, can make the suffered pulling force of spring convert the pressure on beam of uniform strength top to by reversing piece.Above-mentioned two kinds of schemes all need a mechanical transmissioning piece (being respectively fixed pulley and reversing piece) and beam of uniform strength realize displacement to be measured and fiber grating the conversion between strained, cause its structure comparatively loaded down with trivial details, feeler lever and sensitive element can't be point-blank, make its repeatability index be difficult to improve, influence the stability and the reliability of instrument.
Summary of the invention:
The purpose of this utility model is to provide a kind of orthoscopic Optical Fiber Grating Displacement Meter, technical matters such as described this fiber grating orthoscopic displacement meter will solve in the prior art that the Optical Fiber Grating Displacement Meter structure is comparatively loaded down with trivial details, long-time stability and reliability are undesirable.
This orthoscopic Optical Fiber Grating Displacement Meter of the present utility model is made up of a protection tube, a fiber grating, a diaphragm stationary magazine creel, a hard core diaphragm, a feeler lever guide cylinder, two O type circles, a feeler lever, a spring and an armouring optical cable.Wherein, described hard core diaphragm is processed by precision optical machinery by resilient material, its peripheral sealing and fixing is on described diaphragm stationary magazine creel, the diaphragm wherein hard core of a side is a diaphragm optical fiber point of fixity, the tail optical fiber that is used for fixing described fiber grating one end, and the hard core of the opposite side of diaphragm is the point of fixity of described spring, is used for being connected of diaphragm and described spring.
Further, after prestretched, the tail optical fiber of the described fiber grating other end is fixed on optical fiber bearing on the described diaphragm stationary magazine creel.
Further, described spring one end links together with hard core diaphragm, and the other end and feeler lever link together.
Further, described protection tube and described feeler lever guide cylinder are assembled together by screw thread and described diaphragm stationary magazine creel respectively.
Further, described tail optical fiber utilizes described armouring cable protection, and utilizes fluid sealant to seal.
Further, described hard core diaphragm both can be a flat diaphragm, also can be convoluted diaphragm, equally also can be flexible members such as corrugated tube, bellows.
Further, described fiber grating also can be fiber F-P cavity or string wire.
Principle of work of the present utility model is: the termination of described this orthoscopic Optical Fiber Grating Displacement Meter and feeler lever is installed in respectively on two objects under test that have a relative displacement, like this, displacement to be measured just is converted to the relative displacement between feeler lever and the diaphragm, it is the stroke of spring, also just be converted to the variation that spring is applied to the pulling force on the hard core diaphragm, and then cause the micrometric displacement of the hard core of diaphragm, fiber grating is stretched or compress, thereby cause the moving of reflection wavelength of fiber grating, by the amount of movement of detection optical fiber grating reflection wavelength, can detect the change information of displacement to be measured.
The utility model and prior art compare, and its effect is actively with tangible.The utility model is separately fixed at the both sides of hard core diaphragm with fiber grating with the spring that feeler lever links together, and all on the central axis of hard core diaphragm, utilize the displacement to be measured that spring and hard core diaphragm will be bigger to be reduced into the micrometric displacement that fiber grating can bear, and then realize the measurement of displacement to be measured.The utility model does not have rotating converting member, and is simple in structure, stability and good reliability.
Description of drawings:
Fig. 1 is the structural representation of orthoscopic Optical Fiber Grating Displacement Meter of the present utility model.
Embodiment:
Embodiment 1:
As shown in Figure 1; orthoscopic Optical Fiber Grating Displacement Meter of the present utility model is made of 1, tail optical fiber of a protection tube 2, fiber grating 3, diaphragm stationary magazine creel 4, hard core diaphragm 5, spring 6, feeler lever guide cylinder 7, two O type circles 8, a feeler lever 9 and an armouring optical cable 14.Wherein, described hard core diaphragm 5 is processed by precision optical machinery by resilient material, its periphery utilizes the prior art sealing and fixing on described diaphragm stationary magazine creel 4, the described hard core diaphragm 5 wherein hard core of a side is an optical fiber bearing 11, the tail optical fiber that is used for fixing described fiber grating 3 one ends, and the hard core of the opposite side of described hard core diaphragm 5 is a spring bearing 10, is used for and being connected of described spring 6.
Further, be fixed on optical fiber bearing 12 on the diaphragm stationary magazine creel 4 through the tail optical fiber of described fiber grating 3 other ends behind the prestretching.
Further, described spring 6 one ends link together with hard core diaphragm 5, and the other end and feeler lever 9 link together.
Further, described protection tube 1 and feeler lever guide cylinder 7 are assembled together by screw thread and diaphragm stationary magazine creel 4 respectively.
Further, described tail optical fiber 2 utilizes 14 protections of armouring optical cable, and utilizes fluid sealant 13 to seal.
Further, described hard core diaphragm 5 both can be a flat diaphragm, also can be convoluted diaphragm, equally also can be flexible members such as corrugated tube, bellows.
Further, described fiber grating 3 also can be fiber F-P cavity or string wire.
The course of work of embodiment of the present utility model is: the termination of this orthoscopic Optical Fiber Grating Displacement Meter and feeler lever 9 is installed in respectively on two objects under test that have a relative displacement, like this, displacement to be measured just is converted to the relative displacement between feeler lever 9 and the hard core diaphragm 5, it is the stroke of spring 6, also just be converted to the variation that spring 6 is applied to the pulling force on the hard core diaphragm 5, and then cause the micrometric displacement of its hard core, fiber grating 3 is stretched or compress, thereby cause the moving of reflection wavelength of fiber grating 3, the amount of movement of the reflection wavelength by detection optical fiber grating 3 can detect the change information of displacement to be measured.
Concrete, the manufacturing process of present embodiment is:
1) earlier an end tail optical fiber of fiber grating 3 is utilized prior art to be fixed on optical fiber bearing 11 on the hard core diaphragm 5;
2) periphery with hard core diaphragm 5 is fixed on the diaphragm stationary magazine creel 4, and carries out sealing test;
3) fiber grating 3 is stretched a little, utilize prior art that the tail optical fiber of this end of fiber grating 3 is fixed on optical fiber bearing 12 on the diaphragm stationary magazine creel 4;
4) will protect tube 1 to carry out sealing by screw thread with diaphragm stationary magazine creel 4 is connected;
5) tail optical fiber 2 usefulness armouring optical cables 14 protection of fiber grating 3, and carry out and protect a seal approach between tin 1 with fluid sealant 13;
6) end of spring 6 and the spring junction 10 of hard core diaphragm 5 are linked together, the other end and feeler lever connect 9 and are connected together;
7) two O type circles 8 are installed in the groove of feeler lever guide cylinder 7;
8) feeler lever guide cylinder 7 being carried out sealing by screw thread with diaphragm stationary magazine creel 4 is connected.
The material of hard core diaphragm can be a kind of or other better elastic material of stainless steel, bronze.Hard core diaphragm both can be a flat diaphragm, also can be convoluted diaphragm, equally also can be flexible members such as corrugated tube, bellows.
Claims (5)
1. orthoscopic Optical Fiber Grating Displacement Meter, a protection tube, a fiber grating, a diaphragm stationary magazine creel, a hard core diaphragm, a spring, a feeler lever guide cylinder, two O type circles, a feeler lever and an armouring optical cable constitute, it is characterized in that: described hard core diaphragm both sides are respectively arranged with optical fiber bearing and spring junction, and its periphery utilizes the prior art sealing and fixing on described diaphragm stationary magazine creel; Described fiber grating one end is fixed on the optical fiber bearing of hard core diaphragm, the other end is fixed on the optical fiber bearing of described diaphragm stationary magazine creel, and described spring one end is connected spring junction on the hard core diaphragm, the other end is connected on the described feeler lever.
2. orthoscopic Optical Fiber Grating Displacement Meter as claimed in claim 1 is characterized in that: feeler lever, spring, sensitive element fiber grating are all on the central axis of hard core diaphragm.
3. orthoscopic Optical Fiber Grating Displacement Meter as claimed in claim 1; it is characterized in that: described protection tube and feeler lever guide cylinder link together by screw thread and diaphragm stationary magazine creel respectively; and described fiber grating tail optical fiber armouring cable protection, and take seal approach.
4. orthoscopic Optical Fiber Grating Displacement Meter as claimed in claim 1 is characterized in that: described hard core diaphragm both can be a flat diaphragm, also can be convoluted diaphragm, equally also can be flexible members such as corrugated tube, bellows.
5. orthoscopic Optical Fiber Grating Displacement Meter as claimed in claim 1 is characterized in that: described fiber grating also can be fiber F-P cavity or string wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200584512U CN202066479U (en) | 2011-03-08 | 2011-03-08 | Linear fiber bragg grating displacement meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200584512U CN202066479U (en) | 2011-03-08 | 2011-03-08 | Linear fiber bragg grating displacement meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202066479U true CN202066479U (en) | 2011-12-07 |
Family
ID=45060340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200584512U Expired - Lifetime CN202066479U (en) | 2011-03-08 | 2011-03-08 | Linear fiber bragg grating displacement meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202066479U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607422A (en) * | 2011-03-08 | 2012-07-25 | 赵恩国 | Linear fiber bragg grating displacement meter |
| CN102680162A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Atmospheric pressure meter based on fiber bragg grating |
| CN102680161A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Fiber brag grating atmospheric pressure sensing system |
| CN102997848A (en) * | 2012-10-18 | 2013-03-27 | 中国计量学院 | Two-dimensional displacement sensor based on three-core single-mode fiber Bragg grating |
| CN103673895A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Fiber Bragg grating micro-displacement sensor and measuring method thereof |
| CN104165597A (en) * | 2013-05-20 | 2014-11-26 | 上海启鹏工程材料科技有限公司 | Side slope landslide monitoring device and installation method thereof and side slope rolling stone monitoring device |
| CN110736430A (en) * | 2019-10-16 | 2020-01-31 | 中国矿业大学(北京) | Fiber grating displacement meter installation and protection method suitable for deep underground engineering |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
-
2011
- 2011-03-08 CN CN2011200584512U patent/CN202066479U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607422A (en) * | 2011-03-08 | 2012-07-25 | 赵恩国 | Linear fiber bragg grating displacement meter |
| CN102680162A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Atmospheric pressure meter based on fiber bragg grating |
| CN102680161A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Fiber brag grating atmospheric pressure sensing system |
| CN102680161B (en) * | 2012-06-07 | 2014-01-15 | 北京航空航天大学 | Fiber brag grating atmospheric pressure sensing system |
| CN102680162B (en) * | 2012-06-07 | 2014-09-03 | 北京航空航天大学 | Atmospheric pressure meter based on fiber bragg grating |
| CN102997848A (en) * | 2012-10-18 | 2013-03-27 | 中国计量学院 | Two-dimensional displacement sensor based on three-core single-mode fiber Bragg grating |
| CN104165597A (en) * | 2013-05-20 | 2014-11-26 | 上海启鹏工程材料科技有限公司 | Side slope landslide monitoring device and installation method thereof and side slope rolling stone monitoring device |
| CN103673895A (en) * | 2013-11-29 | 2014-03-26 | 华中科技大学 | Fiber Bragg grating micro-displacement sensor and measuring method thereof |
| CN103673895B (en) * | 2013-11-29 | 2016-05-11 | 华中科技大学 | Fiber Bragg Grating FBG micro-displacement sensor and measuring method thereof |
| CN110736430A (en) * | 2019-10-16 | 2020-01-31 | 中国矿业大学(北京) | Fiber grating displacement meter installation and protection method suitable for deep underground engineering |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202066479U (en) | Linear fiber bragg grating displacement meter | |
| CN102607422A (en) | Linear fiber bragg grating displacement meter | |
| CN102562036B (en) | Pressure and temperature monitor system of coal gas bed well based on optical fiber sensing | |
| CN202451145U (en) | Pressure and temperature monitoring system based on optical fiber sensing for coalbed gas well | |
| CN103954413B (en) | Hydraulic cylinder movable sealing Failure status monitoring method based on optical fiber grating sensing | |
| CN202305097U (en) | Fiber bragg grating pressure sensor with temperature compensation function | |
| CN1384341A (en) | Optical-fiber grating sensor detecting pressure temperature simultaneously | |
| CN107121158B (en) | A kind of internal enclosed cantilever beam fiber-optic grating sensor | |
| CN201331395Y (en) | Fibre grating temperature compensation transducer | |
| CN101280690A (en) | Pressure sensor | |
| CN202483561U (en) | Coal-bed gas well liquid level monitoring system based on optical fiber sensing | |
| CN203432538U (en) | Fiber grating crack sensor | |
| Liu et al. | Fiber Bragg grating based displacement sensors: State of the art and trends | |
| CN201408100Y (en) | High precision double corrugated pipe structure fiber grating liquid pressure sensor | |
| CN102620869A (en) | Towing force sensor for fiber bragg grating | |
| CN101625273B (en) | Fiber bragg grating osmometer | |
| CN104101307A (en) | Fibre bragg grating reinforcement strain gauge capable of measuring temperature and strain simultaneously | |
| CN103162880A (en) | Prestressed anchor cable stress monitoring device | |
| CN111537119B (en) | High-precision fiber grating displacement meter with temperature compensation | |
| CN201155966Y (en) | Optical fibre grating displacement meter | |
| CN201707036U (en) | Differential type fiber grating strain transducer | |
| CN102562034B (en) | System for monitoring liquid level of coal-bed gas well based on optical fiber sensing | |
| CN201521291U (en) | Underground distributed temperature sensor | |
| CN203396535U (en) | Fiber bragg grating pressure sensor with temperature compensation | |
| CN112378556A (en) | Optical fiber sensing-based method for monitoring concrete stress on inner wall of pipe jacking pipe joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Fuxiang Inventor before: Zhao Enguo |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151106 Address after: 100081 Beijing Haidian District Zhongguancun 5 South Street hospital staff 3 Patentee after: Liu Fuxiang Address before: 3-1506, 100192, Longgang Road, Beijing, Haidian District, 12 middle of Qing Dynasty Patentee before: Zhao Enguo |
|
| DD01 | Delivery of document by public notice |
Addressee: Liu Fuxiang Document name: Notification of Passing Examination on Formalities |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160706 Address after: 201112, Minhang District, Shanghai River Road, No. 999, 5, 2 Patentee after: SHANGHAI BOJOE SENSING TECHNOLOGY CO., LTD. Address before: 100081 Beijing Haidian District Zhongguancun 5 South Street hospital staff 3 Patentee before: Liu Fuxiang |
|
| DD01 | Delivery of document by public notice |
Addressee: Liu Fuxiang Document name: Notice of conformity |
|
| CX01 | Expiry of patent term |
Granted publication date: 20111207 |
|
| CX01 | Expiry of patent term |