CN102393272A - Fiber bragg grating hydraulic pressure sensing method based on conical fiber - Google Patents
Fiber bragg grating hydraulic pressure sensing method based on conical fiber Download PDFInfo
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- CN102393272A CN102393272A CN2011103118887A CN201110311888A CN102393272A CN 102393272 A CN102393272 A CN 102393272A CN 2011103118887 A CN2011103118887 A CN 2011103118887A CN 201110311888 A CN201110311888 A CN 201110311888A CN 102393272 A CN102393272 A CN 102393272A
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Abstract
The invention discloses a fiber bragg grating hydraulic pressure sensing method based on a conical fiber. The existing method has the defects of low sensitivity, overlength of sensing optical fiber and the like. The method provided by the invention comprises the following steps: firstly determining the fiber bragg grating of a broadband light source, a triport light coupler, an optical spectrum analyser and a conical optical fiber; then connecting the devices according to a measurement scheme; and finally putting the fiber bragg grating of the conical optical fiber in an environment which requires measurement hydraulic pressure, and determining the hydraulic pressure applied to the fiber bragg grating through measuring the central wavelength drifting of the fiber bragg grating of the conical fiber. The method provided by the invention has the advantages of capability of being free from electromagnetic interference, low cost, compact structure, high sensitivity and the like.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of Fiber Bragg Grating FBG hydraulic sensing method based on conical fiber.
Background technology
The invention of optical fiber has brought the revolutionary character development of the communications field, has promoted the birth of information society.The invention of optical fiber has also brought the revolutionary character development of sensing technology on the other hand, becomes the indispensable part of technology of Internet of things development.Because optical fiber not only can be used as the transmission medium of light wave; And when light wave transmits in optical fiber; Meetings such as its characteristic parameter amplitude, phase place, polarization state, wavelength because of extraneous factor such as temperature, pressure, strain, magnetic field, electric field, the displacement equivalence connects or change indirectly, thereby can optical fiber be surveyed physical quantity as sensing element.Optical fiber sensing technology is exactly a characteristic of utilizing optical fiber responsive to some physical quantity, external physical quantity is converted to the technology of the signal that can directly measure.Optical fiber sensing technology is one of of paramount importance sensing technology of optical field, has been widely used in fields such as biology, medical science, space flight, aviation, machinery, petrochemical industry, building, high ferro, bridge, national defense industry.
Fiber Bragg Grating FBG is one of device the most ripe in the optical fiber sensing technology, utilizes Fiber Bragg Grating FBG can realize the sensing of physical quantitys such as temperature, stress, refractive index.At present also can realize hydraulic sensing, but because Fiber Bragg Grating FBG is insensitive to the hydraulic pressure influence, this technical scheme exists the shortcoming of muting sensitivity based on the Fiber Bragg Grating FBG of ordinary optic fibre.The report of at present relevant in addition special optical fiber hydraulic sensing technology mainly is to utilize existing commercial photonic crystal fiber to realize hydraulic sensing, exists shortcomings such as sensitivity is low, sensor fibre is long.Therefore, invent a kind of cheap, compact conformation, highly sensitive hydraulic sensing method is significant.
Summary of the invention
The present invention is exactly the deficiency to prior art, has proposed the Fiber Bragg Grating FBG hydraulic sensing method based on conical fiber.
Method of the present invention may further comprise the steps:
Step (1) selects an output wavelength to cover the Fiber Bragg Grating FBG of the wideband light source of 1500nm to 1600nm, three fiber port coupling mechanisms, a conical fiber and the spectroanalysis instrument of an operation wavelength covering 1500nm to 1600nm;
Step (2) is connected the output port of wideband light source and an input port fiber of fiber coupler; The output port of this fiber coupler and the Fiber Bragg Grating FBG of conical fiber are connected with the fused fiber splice mode, and the output port of this fiber coupler and the input port fiber of spectroanalysis instrument are connected;
Step (3) is inserted the Fiber Bragg Grating FBG of conical fiber the liquid environment that needs to measure hydraulic pressure.The Fiber Bragg Grating FBG of said conical fiber is to be made by following steps: 1) intercepting one segment length more than 10 centimetres, diameter are the general single mode fiber of D (120～130 microns); Adopt existing proven technique that it is pulled into conical fiber; Conical fiber waist diameter d (25～50 microns), waist length L (2～10 centimetres); 2) write Fiber Bragg Grating FBG at the conical fiber waist, its technology is existing mature technology; 3) coat curing glue at the waist of conical fiber, strengthen the physical strength of the Fiber Bragg Grating FBG of conical fiber, and increase the sensitivity of sensor.
The centre wavelength of the Fiber Bragg Grating FBG of conical fiber does
Where
,
respectively tapered fiber Bragg grating period and the effective refractive index of the fiber.When the hydraulic pressure on the Fiber Bragg Grating FBG that is applied to conical fiber changes; The centre wavelength of Fiber Bragg Grating FBG concerns below its hydraulic pressure
and wave length shift
satisfy a wave length shift
should be arranged
Wherein,
It is a constant.The centre wavelength of Fiber Bragg Grating FBG that therefore, can be through measuring conical fiber is drifted about and is confirmed to be applied to the hydraulic pressure on the Fiber Bragg Grating FBG.
The present invention mainly is applicable to the hydraulic pressure of measuring in the liquid, and the centre wavelength of Fiber Bragg Grating FBG of having utilized conical fiber is drifted about to confirm the hydraulic pressure numerical values recited through centre wavelength with the characteristic that hydraulic pressure changes, realized hydraulic sensing.Because the Fiber Bragg Grating FBG that adopts conical fiber is as sensor information, the present invention have the electromagnetic interference (EMI) of not receiving, cheap, compact conformation, high sensitivity this etc. advantage.
Description of drawings
Fig. 1 is the structural representation of optical device in the inventive method;
Fig. 2 is the Fiber Bragg Grating FBG synoptic diagram of conical fiber;
Fig. 3 coats the synoptic diagram that solidifies glue for the conical fiber waist;
Fig. 4 is for utilizing the concrete measurement result figure of the inventive method.
Embodiment
Like Fig. 1, Fig. 2 and shown in Figure 3, comprise Fiber Bragg Grating FBG 3 and spectroanalysis instrument 4 of a wideband light source 1, fiber coupler 2, a conical fiber based on the device of the Fiber Bragg Grating FBG hydraulic sensing of conical fiber.
The output port of wideband light source 1 and an input port fiber of fiber coupler 2 are connected; The output port of this fiber coupler 2 and the Fiber Bragg Grating FBG 3 of conical fiber are connected with the fused fiber splice mode, and the output port of this fiber coupler 2 and the input port fiber of spectroanalysis instrument 4 are connected.Conical fiber is that the general single mode fiber of D (120～130 microns) pulls into conical fiber, conical fiber waist diameter d (25～50 microns), waist length L (2～10 centimetres) through a segment length more than 10 centimetres, diameter; Write Fiber Bragg Grating FBG 5 at the conical fiber waist; Coat the Fiber Bragg Grating FBG 6 that solidifies glue formation conical fiber at the waist of conical fiber.
Utilize the hydraulic sensing method of this pick-up unit may further comprise the steps:
(1) select an output wavelength to cover the Fiber Bragg Grating FBG 3 of the wideband light source 1 of 1500nm to 1600nm, one three fiber port coupling mechanism 2, a conical fiber and the spectroanalysis instrument 4 that operation wavelength covers 1500nm to 1600nm;
(2) output port 1 of wideband light source and an input port fiber of fiber coupler 2 are connected; The output port of this fiber coupler 2 and the Fiber Bragg Grating FBG 3 of conical fiber are connected with the fused fiber splice mode, and the output port of this fiber coupler 2 and the input port fiber of spectroanalysis instrument 4 are connected;
(3) Fiber Bragg Grating FBG 3 of conical fiber is inserted the liquid environment that needs to measure hydraulic pressure.Open wideband light source 1, the centre wavelength of the Fiber Bragg Grating FBG 4 of conical fiber does
When the hydraulic pressure on the Fiber Bragg Grating FBG that is applied to conical fiber changes; The centre wavelength of Fiber Bragg Grating FBG concerns below its hydraulic pressure
and wave length shift
satisfy a wave length shift
should be arranged
Wherein,
It is a constant.The centre wavelength of Fiber Bragg Grating FBG that therefore, can be through measuring conical fiber is drifted about and is confirmed to be applied to the hydraulic pressure on the Fiber Bragg Grating FBG.Concrete measurement result is as shown in Figure 4.
The present invention has utilized the conical fiber manufacturing technology that has just been grown up in recent years and on conical fiber, has inscribed the Fiber Bragg Grating FBG technology; Utilize the Fiber Bragg Grating FBG technique center wavelength characteristic responsive, proposed the new solution of optical fiber hydraulic sensing hydraulic pressure.The present invention adopts the Fiber Bragg Grating FBG technology of conical fiber as sensor information, has advantages such as the electromagnetic interference (EMI) of not receiving, cheap, compact conformation, high sensitivity.
Claims (1)
1. based on the Fiber Bragg Grating FBG hydraulic sensing method of conical fiber, it is characterized in that this method comprises the steps:
Step (1) selects an output wavelength to cover the Fiber Bragg Grating FBG of the wideband light source of 1500nm to 1600nm, three fiber port coupling mechanisms, a conical fiber and the spectroanalysis instrument of an operation wavelength covering 1500nm to 1600nm;
The Fiber Bragg Grating FBG of described conical fiber, its concrete manufacturing process is following:
1) intercepting one segment length more than 10 centimetres, diameter are 120 microns～130 microns general single mode fiber, and it is pulled into conical fiber, and the conical fiber waist diameter is 25 microns～50 microns, 2 centimetres～10 centimetres of waist length;
2) write Fiber Bragg Grating FBG at the conical fiber waist;
3) coat curing glue at the waist of conical fiber, strengthen the physical strength of the Fiber Bragg Grating FBG of conical fiber, and increase the sensitivity of sensor;
Step (2) is connected the output port of wideband light source and an input port fiber of fiber coupler; The output port of this fiber coupler and the Fiber Bragg Grating FBG of conical fiber are connected with the fused fiber splice mode, and the output port of this fiber coupler and the input port fiber of spectroanalysis instrument are connected;
Step (3) is inserted the liquid environment that needs to measure hydraulic pressure with the Fiber Bragg Grating FBG of conical fiber, opens wideband light source, and the centre wavelength of the Fiber Bragg Grating FBG of conical fiber does
Wherein
,
are respectively the effective refractive index of Fiber Bragg Grating FBG cycle and conical fiber; When the hydraulic pressure on the Fiber Bragg Grating FBG that is applied to conical fiber changes; The centre wavelength of Fiber Bragg Grating FBG concerns below its hydraulic pressure
and wave length shift
satisfy a wave length shift
should be arranged
Wherein,
It is a constant; The centre wavelength drift of the Fiber Bragg Grating FBG through measuring conical fiber can confirm to be applied to the hydraulic pressure on the Fiber Bragg Grating FBG.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110311888 CN102393272B (en) | 2011-10-15 | 2011-10-15 | Fiber bragg grating hydraulic pressure sensing method based on conical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110311888 CN102393272B (en) | 2011-10-15 | 2011-10-15 | Fiber bragg grating hydraulic pressure sensing method based on conical fiber |
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| CN102393272A true CN102393272A (en) | 2012-03-28 |
| CN102393272B CN102393272B (en) | 2013-05-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146190A (en) * | 2019-05-20 | 2019-08-20 | 南京邮电大学 | A kind of sensing system and grating design method of symmetric double cone optical-fiber grating |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
| CN113324694A (en) * | 2020-02-29 | 2021-08-31 | 潍坊嘉腾液压技术有限公司 | Fish-shaped fiber grating wide-range pressure sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000033046A1 (en) * | 1998-12-04 | 2000-06-08 | Cidra Corporation | Fused tension-based fiber grating pressure sensor |
| CN1334920A (en) * | 1998-12-04 | 2002-02-06 | 塞德拉公司 | Bragg grating pressure sensor |
| WO2002097388A1 (en) * | 2001-06-01 | 2002-12-05 | Weatherford/Lamb, Inc. | Optical pressure sensor device having creep-resistant optical fiber attachments |
| CN101196426A (en) * | 2006-12-07 | 2008-06-11 | 中国科学院半导体研究所 | Optical fiber optical grating pressure sensor |
| US20080212917A1 (en) * | 2005-07-02 | 2008-09-04 | Schlumberger Technology Corporation | Fiber Optic Temperature and Pressure Sensor and System Incorporating Same |
| CN101655404A (en) * | 2009-09-17 | 2010-02-24 | 上海华魏光纤传感技术有限公司 | Optical hydraulic detection device and method |
| US20100142880A1 (en) * | 2008-12-05 | 2010-06-10 | General Electric Company | Fiber optic sensing system |
-
2011
- 2011-10-15 CN CN 201110311888 patent/CN102393272B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000033046A1 (en) * | 1998-12-04 | 2000-06-08 | Cidra Corporation | Fused tension-based fiber grating pressure sensor |
| CN1334920A (en) * | 1998-12-04 | 2002-02-06 | 塞德拉公司 | Bragg grating pressure sensor |
| US20040129083A1 (en) * | 1998-12-04 | 2004-07-08 | Weatherford/Lamb, Inc. | Optical differential pressure sensor |
| WO2002097388A1 (en) * | 2001-06-01 | 2002-12-05 | Weatherford/Lamb, Inc. | Optical pressure sensor device having creep-resistant optical fiber attachments |
| US20080212917A1 (en) * | 2005-07-02 | 2008-09-04 | Schlumberger Technology Corporation | Fiber Optic Temperature and Pressure Sensor and System Incorporating Same |
| CN101196426A (en) * | 2006-12-07 | 2008-06-11 | 中国科学院半导体研究所 | Optical fiber optical grating pressure sensor |
| US20100142880A1 (en) * | 2008-12-05 | 2010-06-10 | General Electric Company | Fiber optic sensing system |
| CN101655404A (en) * | 2009-09-17 | 2010-02-24 | 上海华魏光纤传感技术有限公司 | Optical hydraulic detection device and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146190A (en) * | 2019-05-20 | 2019-08-20 | 南京邮电大学 | A kind of sensing system and grating design method of symmetric double cone optical-fiber grating |
| CN113324694A (en) * | 2020-02-29 | 2021-08-31 | 潍坊嘉腾液压技术有限公司 | Fish-shaped fiber grating wide-range pressure sensor |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
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| CN102393272B (en) | 2013-05-01 |
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