CN104614093A - Bending-insensitive distributed Brillouin optical fiber temperature and strain sensor - Google Patents
Bending-insensitive distributed Brillouin optical fiber temperature and strain sensor Download PDFInfo
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- CN104614093A CN104614093A CN201510094835.2A CN201510094835A CN104614093A CN 104614093 A CN104614093 A CN 104614093A CN 201510094835 A CN201510094835 A CN 201510094835A CN 104614093 A CN104614093 A CN 104614093A
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Abstract
The invention discloses a bending-insensitive distributed Brillouin optical fiber temperature and strain sensor, relates to the optical field, and aims to solve the problems that most of existing distributed sensors use a single-mode optical fiber, a basic mode in the single-mode optical fiber is sensitive to bending, and when a certain local point of the sensor is excessively bent, a light signal at the point loses quickly to cause failure of a sensing optical fiber behind the point, as well as the sensing distance of the sensor is short. Two ends of a multimode refractive index-gradient optical fiber provided by the invention are fused with two single-mode optical fibers in an aligned manner; the bending-insensitive distributed Brillouin optical fiber temperature and strain sensor can be used in practical engineering application.
Description
Technical field
The present invention relates to a kind of distributed Brillouin fiber optic temperature and strain sensing device of bend-insensitive.Belong to optical field.
Background technology
In recent years, Brillouin optical time domain analysis instrument receives as Distributed Optical Fiber Sensing Techniques field Typical Representative and pays close attention to widely, compared with other Fibre Optical Sensor instruments, Brillouin optical time domain analysis instrument has the advantages such as high spatial resolution, overlength distance sensing and kinetic measurement, can carry out high-acruracy survey to the physical quantity such as temperature and microstrain simultaneously.Because optical fiber is not only as senser element but also as signal channel, using light signal as signal transmission, therefore effectively infrastructure cost can be reduced.This kind of sensor apparatus is widely used in oil pipeline detection, bridge and building structure health monitoring, grows the distance aspect such as highway health monitoring and fire alarm.In addition, Brillouin optical time domain analysis instrument is also applied to temperature and the strain monitoring of seabed or land high-tension cable, and the distributed monitoring etc. of geologic hazard (such as landslide, rubble flow etc.), is applied in special extreme operating environments.
Distributed fiberoptic sensor effectively can solve the key issue in large civil structure health monitoring.But, current most distributed sensor uses single-mode fiber, in practical engineering application, when certain point bending excessive (being greater than critical bend radius) of sensor local, this light signal will be caused to lose rapidly, cause sensor fibre thereafter to lose efficacy, thus shorten the distance sensing of sensor, limit its performance and application.
Summary of the invention
The present invention uses single-mode fiber to solve existing most of distributed sensor, in single-mode fiber, basic mode is to bending sensitivity, when certain point of sensor local bends excessive, this light signal will be caused to lose rapidly, sensor fibre is thereafter caused to lose efficacy, and the problem that the distance sensing of sensor is short.A kind of distributed Brillouin fiber optic temperature and strain sensing device of bend-insensitive is now provided.
A distributed Brillouin fiber optic temperature and strain sensing device for bend-insensitive, it comprises a multimode graded index fiber optic and two single-mode fibers, and the two ends of multimode graded index fiber optic are welded together with alignment so with two single-mode fibers respectively.
Beneficial effect of the present invention is: the present invention adopts a multimode graded index fiber optic to be welded together with alignment so with two single-mode fibers respectively, in order to excite the basic mode in multimode graded index fiber optic, basic mode in multimode graded index fiber optic is to bend-insensitive, there is the ability of opposing macrobending, the loss of optical signal that macrobending causes can be reduced, and optical fiber middle and long distance stable transfer can be remained on, thus realize distributed Brillouin fiber optic temperature and strain sensing.It can be used in practical engineering application.
This patent has following advantage:
1. this patent proposes the distributed Brillouin fiber optic temperature and strain sensing device based on the bend-insensitive of single-mode fiber-multimode optical fiber-single-mode fiber alignment so welding, and the method can stablize the basic mode excited in graded-index multi-mode fiber.Because basic mode in multimode optical fiber is to bend-insensitive, greatly reduces the loss of optical signal of sensor fibre under macrobending, thus realize the distributed Brillouin fiber optic temperature and strain sensing device of bend-insensitive.
2. the basic mode transmission in the multimode optical fiber of gradually changed refractive index is stable, not easily produces higher order mode, can keep the transmission of long distance; Optical fiber is made up of quartz, and fibre loss is little, and transducing signal loss is little, thus can realize the distributed Brillouin fiber optic temperature and strain sensing device of bend-insensitive.
Accompanying drawing explanation
The principle schematic of the distributed Brillouin fiber optic temperature and strain sensing device that Fig. 1 is a kind of bend-insensitive described in embodiment one,
Fig. 2 is a kind of distributed Brillouin fiber optic optical time-domain analyzer principle of device schematic diagram of bend-insensitive.
Embodiment
Embodiment one: illustrate present embodiment with reference to Fig. 1, the distributed Brillouin fiber optic temperature and strain sensing device of a kind of bend-insensitive described in present embodiment, it comprises a multimode graded index fiber optic and two single-mode fibers, and the two ends of multimode graded index fiber optic are welded together with alignment so with two single-mode fibers respectively.
The distributed Brillouin fiber optic temperature and strain sensing device of Brillouin optical time domain analysis instrument to a kind of bend-insensitive described in present embodiment can be adopted to carry out performance evaluation, the principle of described Brillouin optical time domain analysis instrument is shown in Figure 2, adopt a laser instrument 1, the upper branch road light be divided into by fiber coupler 2, as pump light, enters electrooptic modulator 4 after a Polarization Controller 3 regulates polarization state.Under arbitrary-function generator 5 controls, electrooptic modulator 4 output pulse waveform is amplified by an Erbium-Doped Fiber Amplifier (EDFA) 7 after disturbing inclined instrument 6 and upsetting polarization state, enters sensor 13 through optical fiber circulator 14.
Lower branch road provides detection light.Electrooptic modulator 9 is entered after No. two Polarization Controllers 8 regulate polarization state.The effect of No. two electrooptic modulators 9 microwave signal that microwave generator 10 produces is loaded on detection light, and glistening light of waves basis produces frequency difference is Brillouin shift ν publishing originally
bupper lower side frequency light, its frequency is respectively ν
0± ν
b, wherein ν
0for former laser frequency.After fibre optic isolater 11 and No. two Erbium-Doped Fiber Amplifier (EDFA)s 12 amplify, enter sensor 13,
There is stimulated Brillouin scattering phenomenon in pump light and detection light, the stokes light of generation enters No. two circulators 15 through a circulator 14, and (frequency is ν to utilize Fiber Bragg Grating FBG 16 to leach lower side frequency in sensor 13
0-ν
b), then through No. two circulators 15, enter photodetector 17 and convert electric signal to, oscillograph 18 shows.
Standard single-mode fiber is adopted to aim at the sensor of welding with multimode graded index fiber optic, the basic mode in multimode optical fiber can be excited, and the length of multimode graded index fiber optic is within 3 kms, light signal long stable distance transmission in a fiber can be kept, the scope measuring light signal is large, and precision is high and resolution is high.
Laser instrument 1 is that tunable optical fiber laser, distributed feedback type semiconductor laser (DFB) or polarization maintaining optical fibre export.
Single side-band modulator is used to produce side frequency light as detection light.
Adopt tunable optic filter to consider and stokes light.
Differential detector is adopted to convert light signal to electric signal.
Embodiment two: present embodiment is described further the distributed Brillouin fiber optic temperature and strain sensing device of a kind of bend-insensitive described in embodiment one, in present embodiment, the length of described multimode graded index fiber optic is within 40 kms.
Embodiment three: present embodiment is described further the distributed Brillouin fiber optic temperature and strain sensing device of a kind of bend-insensitive described in embodiment one, and in present embodiment, the length of multimode graded index fiber optic is 50 meters.
Claims (3)
1. the distributed Brillouin fiber optic temperature and strain sensing device of a bend-insensitive, it is characterized in that, it comprises a multimode graded index fiber optic and two single-mode fibers, and the two ends of multimode graded index fiber optic are welded together with alignment so with two single-mode fibers respectively.
2. the distributed Brillouin fiber optic temperature and strain sensing device of a kind of bend-insensitive according to claim 1, is characterized in that, the length of described multimode graded index fiber optic is within 40 kms.
3. the distributed Brillouin fiber optic temperature and strain sensing device of a kind of bend-insensitive according to claim 2, is characterized in that, the length of multimode graded index fiber optic is 50 meters.
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| CN105423944A (en) * | 2015-11-09 | 2016-03-23 | 华中科技大学 | Distributed fiber curvature sensor |
| CN106643544A (en) * | 2017-02-23 | 2017-05-10 | 鞍山睿科光电技术有限公司 | Temperature sensitivity enhanced type distributed Brillouin optical fiber sensor |
| CN108765813A (en) * | 2018-06-29 | 2018-11-06 | 鞍山睿科光电技术有限公司 | Expressway barrier destruction positioning system based on distributed fiberoptic sensor and its method |
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| CN108765813A (en) * | 2018-06-29 | 2018-11-06 | 鞍山睿科光电技术有限公司 | Expressway barrier destruction positioning system based on distributed fiberoptic sensor and its method |
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