CN100514014C - Optical fiber pipe hydraulic sensor - Google Patents
Optical fiber pipe hydraulic sensor Download PDFInfo
- Publication number
- CN100514014C CN100514014C CNB2006101651077A CN200610165107A CN100514014C CN 100514014 C CN100514014 C CN 100514014C CN B2006101651077 A CNB2006101651077 A CN B2006101651077A CN 200610165107 A CN200610165107 A CN 200610165107A CN 100514014 C CN100514014 C CN 100514014C
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- support tube
- inner core
- optical fiber
- fiber grating
- hydraulic sensor
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Abstract
The invention provides a fiber duct hydraulic pressure transducer, which is characterized in that the invention comprises a support tube in the cylindric structure; an inner core arranged inside the support tube; a first fiber Bragg grating; a second fiber Bragg grating. The lower part of the support tube is provided with a round orifice; two lug bosses are bonded on the inner wall of the support tube in the axial direction, and are used to install the fiber Bragg gratings. The open end of the inner core is provided with a flange; the outside diameter of the flange is the same with the inside diameter of the support tube; two lug bosses are bonded on the external wall of the inner core in the axial direction, and are used to install the fiber Bragg gratings. Both ends of the first fiber Bragg grating are bonded on the two lug bosses on the inner wall of the support tube. Both ends of the second fiber Bragg grating are bonded on the two lug bosses on the external wall of the inner core. The fiber tips of the two fiber Bragg gratings are led out from the round orifice of the lower part of the support tube and are connected with a checkout equipment.
Description
Technical field
The present invention relates to the fiber optic sensor technology field, relate in particular to a kind of optical fiber pipe hydraulic sensor.
Background technology
Fibre Optical Sensor is compared with corresponding conventional sensors, has remarkable advantages at aspects such as sensitivity, dynamic range, reliabilities, seems particularly outstanding in building, oil, Military Application field.
Optical fiber pressure sensor is all mudulation effects of utilizing the biography light characteristic of optical fiber and it and surrounding environment to interact and produce, surveys the instrument of surrounding environment pressure.It is compared with traditional pressure transducer, and following main advantage is arranged: pressure is highly sensitive, be not subjected to electromagnetic interference (EMI), in light weight, high temperature resistant, structure is small and exquisite, reliable type height, and has information sensing concurrently and optical information is transmitted in advantages such as the whole body.
In view of the as above technical advantage of optical fiber pressure sensor, can satisfy of the requirement of each developed country in fields such as oil, military affairs, actively launched research at present in this regard.
In common intensity modulation type, digital, fiber Bragg grating type optical fiber pressure sensor, the fiber Bragg grating type optical fiber pressure sensor is present main direction of studying.
People such as Fu Haiwei have reported a kind of fiber bragg grating pressure sensor, are to adopt fiber grating is being bonded in the way of carrying out enhanced sensitivity on the circular film, drive fiber grating by circular iris in the strain that makes progress in week and produce strain, thereby detect pressure.The influence that is subjected to packaging technology of the optical fiber pressure sensor of Zhi Zuoing is bigger like this; The inhomogeneous meeting of glue-line makes optic fibre force inhomogeneous, easily produces and warbles; Can't measure the hydraulic pressure of pipeline, and comparatively responsive for variation of temperature.
Therefore, how to reduce encapsulation difficulty, can carry out the measurement of pipeline hydraulic pressure, eliminating responsive to temperature simultaneously is one of essential important technology that solves of optical fiber pressure sensor research field.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of optical fiber pipe hydraulic sensor, to reduce the packaging technology difficulty of optical fiber pressure sensor, can carry out the measurement of pipeline hydraulic pressure, the trip temperature of going forward side by side compensation.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of optical fiber pipe hydraulic sensor of the present invention is characterized in that, comprising:
One support tube, this support tube are cylinder-like structure, and there is a circular hole its underpart, and the inwall of this support tube is bonded with two boss vertically, are used to install fiber grating;
One inner core, this inner tube installation are in support tube inside, and opening one end of this inner core has a flange, and the external diameter of this flange is identical with the internal diameter of support tube, and the outer wall of this inner core is bonded with two boss vertically, is used to install fiber grating;
One first fiber grating, the two ends of this first fiber grating are adhered to respectively on two boss of support tube inwall;
One second fiber grating, the two ends of this second fiber grating are adhered to respectively on two boss on the outer wall of inner core, and the tail optical fiber of this two fiber grating is drawn from the circular hole of support tube bottom, is used for joint detection equipment.
The bottom of wherein said support tube further can be fixed with a column type joint, and there is an aperture centre of this column type joint, and the aperture of this column type joint is communicated with the circular hole of support tube bottom.
Wherein said inner core is threaded with the support tube employing or is bonding.
The upper inside wall of wherein said inner core has screw thread, is used for being connected with the testing liquid pipeline.
Wherein said inner core is identical with the material coefficient of thermal expansion coefficient of support tube.
From technique scheme as can be seen, the present invention has following beneficial effect:
1, technology is simple.Boss carries out the pressure detection and temperature compensation has reduced technology difficulty by fiber grating is adhered to, and makes that process consistency is easy to guarantee.
2, reliability height, good reproducibility.The fiber grating 5 that is used to detect pressure is adhered to the boss 6 and 7 on the inner core 2, has avoided directly bonding to fiber grating, has eliminated chirp.
3, make things convenient for the pipeline hydraulic measurement.Can directly be installed on the testing liquid pipeline by standard thread 13, easy to use.
4, eliminated the influence that ambient temperature changes.Carried out temperature compensation by temperature compensation optical fiber grating 9, the deviation that sensor is caused because of ambient temperature changes is disallowable to be fallen.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describes in detail as after, wherein:
Fig. 1 is the structural profile synoptic diagram of optical fiber pipe hydraulic sensor provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is the structural profile synoptic diagram of optical fiber pipe hydraulic sensor provided by the invention.This optical fiber pipe hydraulic sensor comprises:
One support tube 10, this support tube 10 is a cylinder-like structure, and there is a circular hole 11 its underpart, and the inwall of this support tube 10 is bonded with two boss 12,13 vertically, is used to install fiber grating 30;
One inner core 20, this inner core 20 is installed on support tube 10 inside, and opening one end of this inner core 20 has a flange 21, and the external diameter of this flange 21 is identical with the internal diameter of support tube 10, and the outer wall of this inner core 20 is bonded with two boss 22,23 vertically, is used to install fiber grating 40;
One first fiber grating 30, the two ends of this first fiber grating 30 are adhered to respectively on two boss 12 and 13 of support tube 10 inwalls, and fiber grating 30 is positioned at the central authorities of boss 12 and 13, and fiber grating 30 is used to carry out temperature compensation;
One second fiber grating 40, the two ends of this second fiber grating 40 are adhered to respectively on two boss 22 and 23 on the outer wall of inner core 20, and fiber grating 40 is positioned at the central authorities of boss 22 and 23, and fiber grating 40 is experienced the strain of inner core 20 under hydraulic action; The tail optical fiber of this two fiber grating 30,40 is drawn from the circular hole 11 of support tube 10 bottoms, is used for joint detection equipment.
The bottom of support tube 10 further can be fixed with a column type joint 50, and there is an aperture 51 centre of this column type joint 50, and the aperture 51 of this column type joint 50 is communicated with the circular hole 11 of support tube 10 bottoms, is used to draw the tail optical fiber of fiber grating 30,40.
Described inner core 20 is threaded with support tube 10 employings or is bonding, makes it into as a whole.
The upper inside wall of described inner core 20 has screw thread 24, is used for being connected with the testing liquid pipeline.
In order to make inner core 20 produce the uniform strain of trying one's best when experiencing hydraulic pressure, generally much smaller than the thickness of flange 21 and the thickness of its bottom, its sidewall is a sensitive element to the sidewall thickness of inner core 20.
When the external world had pressure action on sensor, deformation took place and extends in inner core 20, and the distance between boss 22 and the boss 23 changes, and drives bonding fiber grating 40 thereon and produces stretching strain, thereby cause the optical grating reflection wavelength change.For fiber grating, so the variable quantity of its reflection wavelength and strained being directly proportional are by detecting the size that the wavelength change amount can obtain outside pressure.
Inner core 20 adopts the thermal expansivity identical materials to make with support tube 10, when the temperature in the external world changes, because the variation of the fiber grating reflection wavelength that temperature variation causes is identical for sensor fibre grating 40 with temperature compensation optical fiber grating 30, so can be by subtracting each other the elimination influence of temperature variation.
Material parameters such as geometric parameter such as thickness that simultaneously, can be by regulating inner core 20, radius or elastic modulus wait the sensitivity of regulating optical fiber pipe hydraulic sensor.
And, the tail optical fiber of the fiber grating 30 of this optical fiber pipe hydraulic sensor and fiber grating 40 can be together in series with the sensor fibre grating and the temperature compensation optical fiber grating of another optical fiber pipe hydraulic sensor respectively, carry out multimetering.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, a kind of optical fiber pipe hydraulic sensor is characterized in that, comprising:
One support tube, this support tube are cylinder-like structure, and there is a circular hole its underpart, and the inwall of this support tube is bonded with two boss vertically, are used to install fiber grating;
One inner core, this inner tube installation are in support tube inside, and opening one end of this inner core has a flange, and the external diameter of this flange is identical with the internal diameter of support tube, and the outer wall of this inner core is bonded with two boss vertically, is used to install fiber grating;
One first fiber grating, the two ends of this first fiber grating are adhered to respectively on two boss of support tube inwall;
One second fiber grating, the two ends of this second fiber grating are adhered to respectively on two boss on the outer wall of inner core, and the tail optical fiber of this two fiber grating is drawn from the circular hole of support tube bottom, is used for joint detection equipment.
2, optical fiber pipe hydraulic sensor according to claim 1, it is characterized in that, the bottom of wherein said support tube further is fixed with a column type joint, and there is an aperture centre of this column type joint, and the aperture of this column type joint is communicated with the circular hole of support tube bottom.
3, optical fiber pipe hydraulic sensor according to claim 1 is characterized in that, wherein said inner core is threaded with the support tube employing or is bonding.
4, optical fiber pipe hydraulic sensor according to claim 1 is characterized in that, the upper inside wall of wherein said inner core has screw thread, is used for being connected with the testing liquid pipeline.
5, optical fiber pipe hydraulic sensor according to claim 1 is characterized in that, wherein said inner core is identical with the material coefficient of thermal expansion coefficient of support tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101651077A CN100514014C (en) | 2006-12-13 | 2006-12-13 | Optical fiber pipe hydraulic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101651077A CN100514014C (en) | 2006-12-13 | 2006-12-13 | Optical fiber pipe hydraulic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101201283A CN101201283A (en) | 2008-06-18 |
| CN100514014C true CN100514014C (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101651077A Expired - Fee Related CN100514014C (en) | 2006-12-13 | 2006-12-13 | Optical fiber pipe hydraulic sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN100514014C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922289B (en) * | 2010-07-14 | 2013-03-27 | 中国科学院半导体研究所 | Temperature compensation structure of optical fiber detector for high-temperature oil well |
| CN102587893B (en) * | 2012-03-13 | 2015-04-22 | 山东省科学院激光研究所 | Optic fiber temperature pressure sensor and probe thereof |
| CN105486956A (en) * | 2015-12-28 | 2016-04-13 | 武汉中航传感技术有限责任公司 | Hydraulic system on-line monitoring system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6563970B1 (en) * | 1998-02-27 | 2003-05-13 | Abb Research Ltd. | Pressure sensor with fibre-integrated bragg grating, comprising an integrated temperature sensor with fibre-integrated bragg grating |
| JP2004125587A (en) * | 2002-10-02 | 2004-04-22 | Ntt Infranet Co Ltd | Engineering center hall type load cell using optical fiber bragg diffraction grating |
| CN2833523Y (en) * | 2005-09-29 | 2006-11-01 | 西安石油大学 | Fiber grating sensor capable of simultaneously and respectively measuring pressure and temperature |
-
2006
- 2006-12-13 CN CNB2006101651077A patent/CN100514014C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6563970B1 (en) * | 1998-02-27 | 2003-05-13 | Abb Research Ltd. | Pressure sensor with fibre-integrated bragg grating, comprising an integrated temperature sensor with fibre-integrated bragg grating |
| JP2004125587A (en) * | 2002-10-02 | 2004-04-22 | Ntt Infranet Co Ltd | Engineering center hall type load cell using optical fiber bragg diffraction grating |
| CN2833523Y (en) * | 2005-09-29 | 2006-11-01 | 西安石油大学 | Fiber grating sensor capable of simultaneously and respectively measuring pressure and temperature |
Non-Patent Citations (2)
| Title |
|---|
| 一种耐高压光纤布拉格光栅压力传感器. 刘钦朋等.激光与红外，第36卷第6期. 2006 * |
| 基于薄壁应变筒的光纤布拉格光栅压力传感器. 胡志新等.南京理工大学学报，第28卷第3期. 2004 * |
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| Publication number | Publication date |
|---|---|
| CN101201283A (en) | 2008-06-18 |
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Granted publication date: 20090715 Termination date: 20100113 |