CN103925887A - All-fiber bend sensor based on peanut structure - Google Patents
All-fiber bend sensor based on peanut structure Download PDFInfo
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- CN103925887A CN103925887A CN201410158079.0A CN201410158079A CN103925887A CN 103925887 A CN103925887 A CN 103925887A CN 201410158079 A CN201410158079 A CN 201410158079A CN 103925887 A CN103925887 A CN 103925887A
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- 235000017060 Arachis glabrata Nutrition 0.000 title claims description 34
- 241001553178 Arachis glabrata Species 0.000 title claims description 34
- 235000010777 Arachis hypogaea Nutrition 0.000 title claims description 34
- 235000018262 Arachis monticola Nutrition 0.000 title claims description 34
- 235000020232 peanut Nutrition 0.000 title claims description 34
- 239000000835 fiber Substances 0.000 title abstract description 19
- 238000005253 cladding Methods 0.000 claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 29
- 238000005452 bending Methods 0.000 claims abstract description 27
- 238000010276 construction Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
本发明公开了一种基于花生型结构的全光纤弯曲传感器，属于光纤传感器技术领域，由宽带光源、环行器、花生型结构模块、布拉格光纤光栅、带通滤波器、光功率计组成；本发明将布拉格光纤光栅充当反射镜，与花生型结构模块构成传感器的传感头，利用弯曲只对包层模功率产生影响且包层模功率与弯曲曲率成线性关系，通过测得包层模功率实现弯曲测量。本发明具有测量范围大、耐腐蚀、结构简单、温度不敏感、成本低等优点。
The invention discloses an all-optical fiber bending sensor based on a peanut-shaped structure, which belongs to the technical field of optical fiber sensors and consists of a broadband light source, a circulator, a peanut-shaped structure module, a fiber Bragg grating, a band-pass filter, and an optical power meter; the invention The fiber Bragg grating is used as a reflector, and the sensor head of the sensor is composed of a peanut-shaped structural module. The bending only affects the power of the cladding mode and the power of the cladding mode has a linear relationship with the curvature of the bending. By measuring the power of the cladding mode, the Bend measurement. The invention has the advantages of large measuring range, corrosion resistance, simple structure, insensitive temperature, low cost and the like.
Description
Technical field
The present invention relates to a kind of optical fibre bending sensor, relate in particular to a kind of full optical fibre bending sensor based on peanut shaped structure, belong to sensory field of optic fibre.
Background technology
Flexural measurement is being played the part of more and more important role from safety monitoring to Structural Engineering field, and along with the development of optical fiber sensing technology, flexural measurement technology has obtained very large breakthrough.Compare the advantage such as optical fibre bending sensor has that precision is high, compact conformation, corrosion-resistant, anti-electromagnetic interference (EMI) with traditional bend sensor.At present, optical fibre bending sensor is mainly divided into two large classes: a kind of is optical fibre bending sensor based on waveguide mutation structure, as the optical fibre bending sensor based on dislocation welding; The another kind of optical fibre bending sensor based on short period fiber grating and long period fiber grating mixed structure, as the mixed structure bend sensor based on inclined optical fiber grating and long period fiber grating.Optical fibre bending sensor based on waveguide mutation structure has that measurement range is large, signal to noise ratio (S/N ratio) advantages of higher, but structure is not firm, reusability is poor, temperature cross influence is large, measuring accuracy is low.Optical fibre bending sensor measuring accuracy based on short period fiber grating and long period fiber grating mixed structure is high, but complex process is strict to environmental requirement, is not suitable for imbedding or measuring the distortion of interior of articles.The most important thing is, above-mentioned two kinds of optical fibre bending sensors adopt Wavelength demodulation, all need expensive spectroanalysis instrument and follow-up image to process, and cause cost very high, limit its practical application.
Summary of the invention
For the deficiency of prior art scheme, the object of the present invention is to provide a kind of full optical fibre bending sensor based on peanut shaped structure, this bend sensor has that measurement range is large, corrosion-resistant, simple in structure, temperature-insensitive, low cost and other advantages.
The technical scheme that technical solution problem of the present invention is taked is:
A kind of full optical fibre bending sensor based on peanut shaped structure, it is characterized in that, comprise wideband light source (1), circulator (2), peanut shaped construction module (3), bragg grating (4), bandpass filter (5), light power meter (6); Described wideband light source (1) is connected with circulator one port (100), peanut shaped construction module (3) is connected with bragg grating (4) with circulator two ports (101) respectively, circulator three ports (102) are connected with bandpass filter (5) one end, and bandpass filter (5) other end is connected with light power meter (6); Described bragg grating (4) serves as catoptron, with the sensing head of peanut shaped construction module (3) formation sensor; Described bandpass filter (5), by selecting filter range to utilize light power meter (6) to measure respectively core mode power and cladding mode power that sensing head reflects, realizes bending curvature and measures.
Described peanut shaped construction module (3) is in one end of optical fiber, to utilize commercial heat sealing machine manually to discharge to form a ball, in like manner make another ball, the optical fiber recycling heat sealing machine of two sections of dribblings is fused into peanut shaped construction module, and its length is 0.3-3cm, and two bulb diameters are 125-400 μ m.
Beneficial effect of the present invention is:
1, utilize the principle of reflection type strength modulation to measure curvature, do not need expensive spectrometer, with low cost;
2, utilize core mode power to be only subject to the impact of temperature, and cladding mode power is subject to the impact of temperature, bending simultaneously, by to cladding mode power and core mode power subtraction, just can accurately obtain relation crooked and cladding mode power, thereby solve temperature cross-sensitivity.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Fig. 1 is the full optical fibre bending sensor structural representation that the present invention is based on peanut shaped structure.
1 is wideband light source; 2 is circulator; 3 is peanut shaped construction module; 4 is bragg grating; 5 is bandpass filter; 6 is light power meter; 100 is circulator one port; 101 is circulator two ports; 102 is circulator three ports.
Embodiment
Below in conjunction with structure of the present invention and principle of work, elaborate:
In Fig. 1, a kind of full optical fibre bending sensor based on peanut shaped structure, comprises wideband light source 1, circulator 2, peanut shaped construction module 3, bragg grating 4, bandpass filter 5, light power meter 6; Described wideband light source 1 is connected with circulator one port 100, peanut shaped construction module 3 is connected with bragg grating 4 with circulator two port ones 01 respectively, circulator three port ones 02 are connected with bandpass filter 5 one end, and bandpass filter 5 other ends are connected with light power meter 6; Described bragg grating 4 serves as catoptron, with the sensing head of peanut shaped construction module 3 formation sensors; Described bandpass filter (5), by selecting filter range to utilize light power meter (6) to measure respectively core mode power and cladding mode power that sensing head reflects, realizes bending curvature and measures.
A kind of full optical fibre bending sensor principle of work based on peanut shaped structure:
The light that wideband light source 1 sends enters peanut shaped construction module 3 by circulator 2, because mode field diameter is not mated, inspire cladding mode, part light is transmitted in covering, and remaining light still transmits in fibre core, and peanut shaped construction module 3 is very short with the distance of bragg grating 4, so the decay of the luminous energy of clad section is limited, when through bragg grating 4, cladding mode is again coupled to fibre core and is carried out reverse transfer, forms first loop.During simultaneously remaining core mode process bragg grating 4, be coupled in the core mode and cladding mode of reverse transfer, again through peanut shaped construction module 3, be again coupled and got back to fibre core, form second loop, so in sensing probe, light transmission form two from fibre core to covering again to the loop of fibre core.Because cladding mode is crooked responsive to external world, when optical fiber sensor head is crooked, cladding mode field distribution and Mode Coupling characteristic thereof are affected, and crooked is more severe, and loss is larger, and the cladding mode power of measurement is less.The core mode of reflection and cladding mode, after circulator three port ones 02 and bandpass filter 5, are measured Output optical power by light power meter 6.Wherein bandpass filter 5 is by selecting filter range to utilize light power meter 6 to measure respectively core mode power and cladding mode power that sensing head reflects, due to cladding mode power and crooked curvature linear, obtain cladding mode power and can obtain extraneous crooked information.
Embodiment
The present invention is based on the full optical fibre bending sensor of peanut shaped structure as shown in Figure 1, wherein wideband light source 1 wavelength coverage is 1400-1600nm, the length of peanut shaped construction module 3 is 1cm, two bulb diameters are respectively 209.459 μ m, 194.260 μ m, bragg grating 4 grid region length 1cm, centre wavelength 1550nm, reflectivity is 90%.
1400-1600nm wideband light source is connected with circulator one port (100), 1cm peanut shaped construction module 3 is connected with 1cm bragg grating 4 with circulator two port ones 01 respectively, circulator three port ones 02 are connected with bandpass filter 5 one end, and bandpass filter 5 other ends are connected with light power meter 6.1400-1600nm wideband light source 1 enters peanut shaped construction module 3 by circulator 2, because mode field diameter is not mated, inspire cladding mode, part light is transmitted in covering, and remaining light still transmits in fibre core, and 1cm peanut shaped construction module 3 is very short with the distance of 1cm bragg grating 4, so the decay of the luminous energy of clad section is limited, when through 1cm bragg grating 4, cladding mode is again coupled to fibre core and is carried out reverse transfer, forms first loop.During simultaneously remaining core mode process 1cm bragg grating 4, be coupled in the core mode and cladding mode of reverse transfer, again through 1cm peanut shaped construction module 3, be again coupled and got back to fibre core, form second loop, so in sensing probe, light transmission form two from fibre core to covering again to the loop of fibre core.Because cladding mode is crooked responsive to external world, when fibre-optical probe is crooked, cladding mode field distribution and Mode Coupling ability thereof are affected, and crooked is more severe, and loss is larger, and the cladding mode power measuring is less.Reflected light is in circulator three port one 02 outputs, and by bandpass filter 5, the core mode that sensor is reflected separates with cladding mode, obtain the cladding mode power of reflection type strength modulation, bandpass filter 5 is by connecting power meter 6, can record cladding mode performance number, due to cladding mode power and curvature linear, thereby obtain extraneous crooked information.
Above embodiment is one of preferred version in all schemes of the present invention, and other simple change to the full optical fibre bending sensor based on peanut shaped structure all belongs to the scope that the present invention protects.
Claims (2)
1. the full optical fibre bending sensor based on peanut shaped structure, it is characterized in that, comprise wideband light source (1), circulator (2), peanut shaped construction module (3), bragg grating (4), bandpass filter (5), light power meter (6); Described wideband light source (1) is connected with circulator one port (100), peanut shaped construction module (3) is connected with bragg grating (4) with circulator two ports (101) respectively, circulator three ports (102) are connected with bandpass filter (5) one end, and bandpass filter (5) other end is connected with light power meter (6); Described bragg grating (4) serves as catoptron, with the sensing head of peanut shaped construction module (3) formation sensor; Described bandpass filter (5), by selecting filter range to utilize light power meter (6) to measure respectively core mode power and cladding mode power that sensing head reflects, realizes bending curvature and measures.
2. a kind of full optical fibre bending sensor based on peanut structure according to claim 1, it is characterized in that described peanut shaped construction module (3) is in one end of optical fiber, to utilize commercial heat sealing machine manually to discharge to form a ball, in like manner make another ball, the optical fiber recycling heat sealing machine of two sections of dribblings is fused into peanut shaped construction module, its length is 0.3-3cm, and two bulb diameters are 125-400 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410158079.0A CN103925887A (en) | 2014-04-16 | 2014-04-16 | All-fiber bend sensor based on peanut structure |
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| CN201410158079.0A CN103925887A (en) | 2014-04-16 | 2014-04-16 | All-fiber bend sensor based on peanut structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
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| US6396588B1 (en) * | 1999-10-06 | 2002-05-28 | Trw Inc. | Hybrid curvature-tilt wave front sensor |
| US7390999B1 (en) * | 2005-06-22 | 2008-06-24 | University Of Central Florida Research Foundation, Inc. | Differential Shack-Hartmann curvature sensor |
| CN201247049Y (en) * | 2008-09-10 | 2009-05-27 | 山东大学 | Measuring apparatus for testing dynamic strain, vibration and acceleration |
| CN102519384A (en) * | 2011-12-28 | 2012-06-27 | 烟台睿创微纳技术有限公司 | Device for detecting blade strain on line based on optical fiber grating |
| CN102980681A (en) * | 2012-11-16 | 2013-03-20 | 暨南大学 | Distributed strain and temperature optical fiber sensor based on brillouin scattering |
| CN103344194A (en) * | 2013-07-17 | 2013-10-09 | 中国科学院半导体研究所 | Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator |
| CN203785642U (en) * | 2014-04-16 | 2014-08-20 | 中国计量学院 | An all-fiber bending sensor based on a peanut-shaped structure |
-
2014
- 2014-04-16 CN CN201410158079.0A patent/CN103925887A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6396588B1 (en) * | 1999-10-06 | 2002-05-28 | Trw Inc. | Hybrid curvature-tilt wave front sensor |
| US7390999B1 (en) * | 2005-06-22 | 2008-06-24 | University Of Central Florida Research Foundation, Inc. | Differential Shack-Hartmann curvature sensor |
| CN201247049Y (en) * | 2008-09-10 | 2009-05-27 | 山东大学 | Measuring apparatus for testing dynamic strain, vibration and acceleration |
| CN102519384A (en) * | 2011-12-28 | 2012-06-27 | 烟台睿创微纳技术有限公司 | Device for detecting blade strain on line based on optical fiber grating |
| CN102980681A (en) * | 2012-11-16 | 2013-03-20 | 暨南大学 | Distributed strain and temperature optical fiber sensor based on brillouin scattering |
| CN103344194A (en) * | 2013-07-17 | 2013-10-09 | 中国科学院半导体研究所 | Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator |
| CN203785642U (en) * | 2014-04-16 | 2014-08-20 | 中国计量学院 | An all-fiber bending sensor based on a peanut-shaped structure |
Non-Patent Citations (2)
| Title |
|---|
| XIAO YANG.ETAL: "An Optical Fiber Curvature Sensor Based on Two Peanut-Shape Structures Modal Interferometer", 《IEEE PHOTONICS TECHNOLOGY LETTERS》, vol. 26, no. 1, 31 January 2014 (2014-01-31), pages 22 - 24, XP011533281, DOI: doi:10.1109/LPT.2013.2288978 * |
| 刘阳: "光纤光栅器件的制备及应用", 《中国优秀硕士学位论文全文数据库 信息科技辑》, no. 2, 15 February 2013 (2013-02-15), pages 45 - 55 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423953A (en) * | 2015-12-23 | 2016-03-23 | 中国计量学院 | Embedded spherical structure long-period fiber grating curvature sensor |
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Application publication date: 20140716 |