CN103940455A - All-fiber high accuracy sensor based on optical fiber multi-mode interference and application thereof - Google Patents
All-fiber high accuracy sensor based on optical fiber multi-mode interference and application thereof Download PDFInfo
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- CN103940455A CN103940455A CN201410143588.6A CN201410143588A CN103940455A CN 103940455 A CN103940455 A CN 103940455A CN 201410143588 A CN201410143588 A CN 201410143588A CN 103940455 A CN103940455 A CN 103940455A
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Abstract
The invention discloses an all-fiber high accuracy sensor based on optical fiber multi-mode interference and an application thereof. The all-fiber high accuracy sensor is composed of a first single-mode optical fiber, a multi-mode optical fiber, a coreless optical fiber and a second single-mode optical fiber. The first single-mode optical fiber, the multi-mode optical fiber, the coreless optical fiber and the second single-mode optical fiber are sequentially combined to be subjected to butt fusion. The specification of the first single-mode optical fiber is the same as the specification of the second single-mode optical fiber, the diameter of a core layer of the single-mode optical fiber is smaller than the diameter of a core layer of the multi-mode optical fiber, and the first single-mode optical fiber and the second single-mode optical fiber are used as the incidence end and the transmission end of a light source respectively. The multi-mode optical fiber is used as a mode coupler, the excitation efficiency of a high order mode in the coreless optical fiber is improved, and the coreless optical fiber serves as a measurement zone. The all-fiber sensor has the advantages of being low in cost, high in precision, small in size and compact in structure. A section of multi-mode optical fiber is used as the mode coupler, so that the measurement accuracy of the all-fiber high accuracy sensor is further optimized.
Description
Technical field
The present invention relates to the sensory field of optic fibre such as health care, bio-sensing, environmental monitoring, be specifically related to a kind of full optical fiber high-precision sensor and application thereof based on optical fiber multiple-mode interfence (MMI) principle.
Background technology
Full Fibre Optical Sensor is an important field of optical fiber sensing technology through engineering approaches research.Its compared to traditional sensors there is high security, anti-electromagnetic interference (EMI), the Inherent advantage such as corrosion-resistant, simple in structure, volume is little, sensitivity is high.This sensor based on all optical fibre structure is formed by different types of fused fiber splice simultaneously, has the features such as cost is low, manufacture craft is simple, sensitivity is high compared to existing Fiber Bragg Grating FBG of being used widely (FBG), long period fiber grating (LPG) etc.In the last few years, along with the development of optical fiber sensing technology, and both at home and abroad to the going deep into of all optical fibre structure sensor research, the Fibre Optical Sensor based on this principle will progressively be produced and be applied in fields such as health care, bio-sensing, environmental monitorings.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of full optical fiber high-precision sensor based on optical fiber multiple-mode interfence, overcome the deficiency of traditional sensors, and the defect such as Fiber Bragg Grating FBG (FBG) and long-period gratings (LPG) cost is high, complex manufacturing technology.
For solving the problems of the technologies described above, the invention provides a kind of full optical fiber high-precision sensor based on optical fiber multiple-mode interfence.Formed described the first single-mode fiber, multimode optical fiber, coreless fiber, the second single-mode fiber sequential combination welding by the first single-mode fiber, multimode optical fiber, coreless fiber, the second single-mode fiber four parts; Described the first single-mode fiber is identical with the second single-mode fiber specification; Described single-mode fiber sandwich layer diameter is less than the sandwich layer diameter of described multimode optical fiber; The first described single-mode fiber and the second single-mode fiber are respectively as incident end and the transmission end of light source, and multimode optical fiber, as mode coupler, improves the launching efficiency of higher order mode in coreless fiber, and coreless fiber is measurement zone.
Preferably, described each optical fiber has identical cladding diameter.The length of described multimode optical fiber is got 20-150cm.The length of described coreless fiber is n* (1.45～1.47) cm, and wherein n is the integer of [1～10].
More excellent, the length of described coreless fiber is 4* (1.45～1.47) cm.Automatic welding pattern is selected in the welding of described each optical fiber.
The invention allows for the application of a kind of full optical fiber high-precision sensor based on optical fiber multiple-mode interfence as all-optical fiber liquid level meter.
Advantage of the present invention is to have designed the full Fibre Optical Sensor of the little and compact conformation of a kind of low cost, high precision, volume.Use one section of multimode optical fiber as mode coupler, further optimized the measuring accuracy of this invention.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is further described in detail.
Fig. 1 is full optical fibre sensor structure schematic diagram of the present invention.
Wherein, the 1-the first single-mode fiber, 2-multimode optical fiber, 3-coreless fiber, the 4-the second single-mode fiber; The covering that in figure, white portion is optical fiber, the sandwich layer that grey color part is optical fiber.
Embodiment
As shown in Figure 1, full Fibre Optical Sensor of the present invention is according to the sequential combination welding of the first single-mode fiber, multimode optical fiber, coreless fiber, the second single-mode fiber.Described the first single-mode fiber is identical with the second single-mode fiber specification, is general single mode fiber; Described multimode optical fiber is common multimode optical fiber.Single-mode fiber sandwich layer diameter is less than the sandwich layer diameter of multimode optical fiber; Coreless fiber is without core structure; Described optical fiber has identical cladding diameter, selects automatic welding pattern when welding.The length of multimode optical fiber is got 20-150cm.The length of coreless fiber is n* (1.45-1.47) cm, the integer that wherein n is [1-10].The length of coreless fiber is 4* (1.45～1.47) cm optimum.
Select wide spectrum light source (C+L wave band) as incident light source.When light is when left end the first single-mode fiber enters into multimode optical fiber, because the difference of two kinds of fiber core layer diameters produces mould field mismatch effects, make the basic mode in the first single-mode fiber in multimode optical fiber, inspire higher order mode; Multimode optical fiber length long enough, after transmission mode field reaches and stablizes, again occur mould field mismatch at multimode optical fiber and coreless fiber weld, in coreless fiber, higher order mode is excited again, and exciting of twice pattern improved the coupling efficiency of energy from basic mode to higher order mode greatly.At the weld of coreless fiber and the second single-mode fiber, in coreless fiber, part higher order mode will be coupled in the sandwich layer of the second single-mode fiber again, and multiple-mode interfence occurs; This is because different rank higher order mode has different longitudinal transmissions, exists optical path difference and causes.
Counting example with all-optical fiber liquid level is below further described.While carrying out level gauging, extraneous liquid or air serve as its covering, and then change the effective refractive index of different mode in coreless fiber.In the time that extraneous liquid level changes, measurement zone, be that the each high-order mode average effective of coreless fiber part refractive index changes, and different rank pattern effective refractive index changes not identical, also just make between pattern that effective refractive index is poor to change, cause the change of optical path difference, and then interference spectum is drifted about.
The analytic method of all-optical fiber liquid level meter is to utilize the multimode interference principle of optical fiber to realize the measurement to the extraneous liquid level of coreless fiber.Said structure sensor mechanism is given by the following formula.
Wherein, L is the length of level gauging district coreless fiber, and m is LP in coreless fiber
0mpattern excite coefficient, m is LP in coreless fiber
0mlongitudinal transmission of pattern, m is the label of pattern exponent number.
Wherein, E (r, 0) is for being input to the light field in coreless fiber, and m (r) is m rank LP
0mthe field distribution of pattern.In the above-mentioned structure of mentioning, adopt one section of longer multimode optical fiber as mode coupler, through exciting of twice higher order mode, m is improved, and allows basic mode energy in single-mode fiber be coupled to more the high-order LP of coreless fiber
0min pattern, thereby the optical fiber multiple-mode interfence that occurs in coreless fiber and single-mode fiber weld is strengthened.
Wherein, k
0for the wave number in vacuum,
for m rank LP
0mthe effective refractive index of pattern.The change of effective refractive index will affect the transmission spectrum of said structure.What it is pointed out that the utilization of said structure survey liquid level is exactly the variation of effective refractive index with liquid level.When level gauging district, when coreless fiber immerses in liquid, the effective refractive index that is immersed in the part associative mode in liquid will change, and be different from the effective refractive index that is placed in air part; Along with the variation of measurement zone immersion length, react the drift for transmission spectrum wavelength, thereby carry out the measurement of liquid level.
What deserves to be explained is, the variation of extraneous liquid refractivity, temperature, axial stress also can change its effective refractive index, and therefore, the present invention also can be used for liquid refractivity, temperature and answers force measurement.The measurement of refractive index, temperature also changes the variation of caused optical path difference based on each high-order mode effective refractive index difference.The measurement of axial stress is because the deformation that stress produces is drifted about interference spectum, also can be regarded as the variation of corresponding effective refractive index difference.Therefore, the present invention has great using value at sensory fields such as health care, bio-sensing, environmental monitorings.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence, it is characterized in that, formed described the first single-mode fiber, multimode optical fiber, coreless fiber, the second single-mode fiber sequential combination welding by the first single-mode fiber, multimode optical fiber, coreless fiber, the second single-mode fiber four parts; Described the first single-mode fiber is identical with the second single-mode fiber specification; Described single-mode fiber sandwich layer diameter is less than the sandwich layer diameter of described multimode optical fiber; The first described single-mode fiber and the second single-mode fiber are respectively as incident end and the transmission end of light source, and multimode optical fiber, as mode coupler, improves the launching efficiency of higher order mode in coreless fiber, and coreless fiber is measurement zone.
2. the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence according to claim 1, is characterized in that, described each optical fiber has identical cladding diameter.
3. the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence according to claim 2, is characterized in that, the length of described multimode optical fiber is got 20-150cm.
4. the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence according to claim 3, is characterized in that, the length of described coreless fiber is n* (1.45～1.47) cm, and wherein n is the integer of [1～10].
5. the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence according to claim 4, is characterized in that, the length of described coreless fiber is 4* (1.45～1.47) cm.
6. according to the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence one of claim 1 to 5 Suo Shu, it is characterized in that, automatic welding pattern is selected in the welding of described each optical fiber.
7. according to an application for the full optical fiber high-precision sensor based on optical fiber multiple-mode interfence described in right 6, it is characterized in that, the described full optical fiber high-precision sensor based on optical fiber multiple-mode interfence is as all-optical fiber liquid level meter.
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| CN104729628A (en) * | 2015-03-25 | 2015-06-24 | 浙江工业大学 | Fiber-based liquid level sensor and liquid level measurement method |
| CN106289600A (en) * | 2016-09-21 | 2017-01-04 | 江苏大学 | A kind of optical fiber stress sensor part |
| CN106500906A (en) * | 2016-12-14 | 2017-03-15 | 北京交通大学 | Baroceptor based on coreless fiber |
| CN107179516A (en) * | 2017-07-28 | 2017-09-19 | 中国工程物理研究院激光聚变研究中心 | Magnetic field intensity detection sensor based on single mode multimode coreless fiber structure |
| CN107247037A (en) * | 2017-07-28 | 2017-10-13 | 中国工程物理研究院激光聚变研究中心 | Molecular state organic pollutant monitoring sensor based on single mode multimode coreless fiber structure |
| CN109186647A (en) * | 2018-10-10 | 2019-01-11 | 武汉隽龙科技股份有限公司 | Eliminate the device and method of fiber end face reflection |
| CN109683113A (en) * | 2019-01-28 | 2019-04-26 | 苏州德睿电力科技有限公司 | A kind of fiber F-P cavity magnetic field sensor and preparation method thereof |
| CN109974814A (en) * | 2019-04-12 | 2019-07-05 | 重庆理工大学 | Michelson liquid level sensor and measurement method are responded based on multiple-mode interfence low temperature |
| CN110068551A (en) * | 2019-06-04 | 2019-07-30 | 中国计量大学 | A kind of symmetrical cascade structured optical fiber SPR detector |
| CN110558958A (en) * | 2019-08-21 | 2019-12-13 | 武汉凯锐普信息技术有限公司 | vital sign monitoring devices based on light wave mode selection |
| CN113670377A (en) * | 2021-08-05 | 2021-11-19 | 丁磊 | Multi-parameter detection device and method based on cascade polarization-maintaining optical fiber composite sensor |
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| CN104729628B (en) * | 2015-03-25 | 2017-08-22 | 浙江工业大学 | A kind of liquid level sensor and level measuring method based on optical fiber |
| CN104729628A (en) * | 2015-03-25 | 2015-06-24 | 浙江工业大学 | Fiber-based liquid level sensor and liquid level measurement method |
| CN106289600A (en) * | 2016-09-21 | 2017-01-04 | 江苏大学 | A kind of optical fiber stress sensor part |
| CN106500906B (en) * | 2016-12-14 | 2022-03-01 | 北京交通大学 | Air pressure sensor based on coreless optical fiber |
| CN106500906A (en) * | 2016-12-14 | 2017-03-15 | 北京交通大学 | Baroceptor based on coreless fiber |
| CN107179516A (en) * | 2017-07-28 | 2017-09-19 | 中国工程物理研究院激光聚变研究中心 | Magnetic field intensity detection sensor based on single mode multimode coreless fiber structure |
| CN107247037A (en) * | 2017-07-28 | 2017-10-13 | 中国工程物理研究院激光聚变研究中心 | Molecular state organic pollutant monitoring sensor based on single mode multimode coreless fiber structure |
| CN107247037B (en) * | 2017-07-28 | 2023-06-02 | 中国工程物理研究院激光聚变研究中心 | Molecular organic pollutant monitoring sensor based on single-mode-multimode-coreless optical fiber structure |
| CN107179516B (en) * | 2017-07-28 | 2023-06-09 | 中国工程物理研究院激光聚变研究中心 | Magnetic field intensity detection sensor based on single-mode-multimode-coreless optical fiber structure |
| CN109186647A (en) * | 2018-10-10 | 2019-01-11 | 武汉隽龙科技股份有限公司 | Eliminate the device and method of fiber end face reflection |
| CN109186647B (en) * | 2018-10-10 | 2024-01-02 | 武汉昊衡科技有限公司 | Device and method for eliminating reflection of optical fiber end face |
| CN109683113A (en) * | 2019-01-28 | 2019-04-26 | 苏州德睿电力科技有限公司 | A kind of fiber F-P cavity magnetic field sensor and preparation method thereof |
| CN109974814A (en) * | 2019-04-12 | 2019-07-05 | 重庆理工大学 | Michelson liquid level sensor and measurement method are responded based on multiple-mode interfence low temperature |
| CN110068551A (en) * | 2019-06-04 | 2019-07-30 | 中国计量大学 | A kind of symmetrical cascade structured optical fiber SPR detector |
| CN110558958A (en) * | 2019-08-21 | 2019-12-13 | 武汉凯锐普信息技术有限公司 | vital sign monitoring devices based on light wave mode selection |
| CN113670377A (en) * | 2021-08-05 | 2021-11-19 | 丁磊 | Multi-parameter detection device and method based on cascade polarization-maintaining optical fiber composite sensor |
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