CN104236601A - Double-parameter optical fiber sensor on basis of spherical structures and multi-mode optical fibers - Google Patents
Double-parameter optical fiber sensor on basis of spherical structures and multi-mode optical fibers Download PDFInfo
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- CN104236601A CN104236601A CN201410530006.XA CN201410530006A CN104236601A CN 104236601 A CN104236601 A CN 104236601A CN 201410530006 A CN201410530006 A CN 201410530006A CN 104236601 A CN104236601 A CN 104236601A
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Abstract
The invention discloses a double-parameter optical fiber sensor on the basis of spherical structures and multi-mode optical fibers. The double-parameter optical fiber sensor comprises an incidence-end single-mode optical fiber, an optical fiber a with a spherical structure, a middle-section multi-mode optical fiber, an optical fiber b with a spherical structure and an emergence-end single-mode optical fiber. The incidence-end single-mode optical fiber, the optical fiber a with the spherical structure, the middle-section multi-mode optical fiber, the optical fiber b with the spherical structure and the emergence-end single-mode optical fiber are serially connected with one another, the front end of the incidence-end single-mode optical fiber is connected with a broadband light source, and the rear end of the emergence-end single-mode optical fiber is connected with a spectrum analyzer; the end surfaces of the single-mode optical fibers discharge to form the optical fiber a with the spherical structure and the optical fiber b with the spherical structure; the middle-section multi-mode optical fiber is used as a sensing region, signals outputted by the middle-section multi-mode optical fiber contain interference peaks in different modes, and the interference peaks are combined with sensitivity equations, so that temperatures and liquid level can be simultaneously measured according to temperature and liquid level sensitivity difference of the different interference peaks. The double-parameter optical fiber sensor has the advantages that the double-parameter optical fiber sensor is simple in structure and easy to manufacture, the interference peaks in the different modes are available in the outputted signals, and accordingly the temperatures and the liquid level can be simultaneously measured according to the temperature and liquid level sensitivity difference of the interference peaks; the double-parameter optical fiber sensor is low in manufacturing cost, high in measurement precision and practicality and suitable for popularization and application.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, particularly a kind of two parameteric light fiber sensors based on spherical structure and multimode optical fiber.
Background technology
Fibre Optical Sensor goes the attention enjoying numerous researchers because of advantages such as it are highly sensitive, electromagnetism interference, electrical insulating property are good, corrosion-resistant, volume is little, lightweight.Temperature sensor, strain transducer, index sensor and liquid level sensor etc. are in succession developed out and come into operation.Interferometric optical fiber sensor is compared with conventional fiber optic sensors, and highly sensitive high with resolution, responding range is large, and cost is low.
Temperature is an important physical amount as weighing the motion of the objective material world and existence thereof, and the acquisition of temperature information, can make people grasp the inherent law of objective world better; Liquid level is a very important controling parameters in industrial processes, and in oil-gas gathering and transportation, storing and transporting system, the Measurement & Control of liquid level, for metering oil water tank dielectric capacity, maintains the balance of container material, ensure normal produce and device security most important.。
Summary of the invention
The object of the invention is to provide a kind of two parameteric light fiber sensors based on spherical structure and multimode optical fiber, this optical fibre sensor structure simply, easily makes, the interference peaks of different mode is there is in output signal, according to its different susceptibility to temperature and liquid level, can realize measuring while temperature and liquid level.
Technical scheme of the present invention:
A kind of two parameteric light fiber sensors based on spherical structure and multimode optical fiber, be composed in series by incidence end single-mode fiber, spherical structure optical fiber a, interlude multimode optical fiber, spherical structure optical fiber b and exit end single-mode fiber, the front end of incidence end single-mode fiber is connected with wideband light source, the rear end of exit end single-mode fiber is connected with spectroanalysis instrument, and the diameter of incidence end single-mode fiber and exit end single-mode fiber is 125 μm; Spherical structure optical fiber a, b are discharged by single-mode fiber end face and are formed, and as mode coupler, strength of discharge is 100-130bit, and discharge time is 1700-1800ms; Core diameter 10-65 μm of interlude multimode optical fiber, length is for being 20-40mm, interlude multimode optical fiber comprises the interference peaks of different mode as the signal that sensitive zones exports, according to different interference peaks to temperature and liquid level sensitivity difference, in conjunction with responsive equation, realize the measurement simultaneously to temperature and liquid level.
Advantage of the present invention and beneficial effect are:
This Fibre Optical Sensor, structure simply, easily makes, and there is the interference peaks of different mode in output signal, according to its different susceptibility to temperature and liquid level, can realize measuring while temperature and liquid level; The Fibre Optical Sensor cost of manufacture of being somebody's turn to do is low, measuring accuracy is high, practical, be suitable for applying.
Accompanying drawing explanation
Fig. 1 is this optical fibre sensor structure schematic diagram.
Fig. 2 is the output signal spectrum of this Fibre Optical Sensor.
In figure: 1. incidence end single-mode fiber 2. spherical structure optical fiber a 3. interlude multimode optical fiber
4. spherical structure optical fiber b 5. exit end multimode optical fiber 6. wideband light source 7. spectroanalysis instrument.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment:
A kind of two parameteric light fiber sensors based on spherical structure and multimode optical fiber, as shown in Figure 1, be composed in series by incidence end single-mode fiber 1, spherical structure optical fiber a2, interlude multimode optical fiber 3, spherical structure optical fiber b4 and exit end single-mode fiber 5, the front end of incidence end single-mode fiber 1 is connected with wideband light source 6, the rear end of exit end single-mode fiber 5 is connected with spectroanalysis instrument 7, and the diameter of incidence end single-mode fiber 1 and exit end single-mode fiber 5 is 125 μm; Spherical structure optical fiber a2, b4 are discharged by single-mode fiber end face and are formed, and as mode coupler, strength of discharge is 120bit, and discharge time is 1750ms; The core diameter 50 μm of interlude multimode optical fiber, length are 30mm, interlude multimode optical fiber comprises the interference peaks of different mode as the signal that sensitive zones exports, according to different interference peaks to temperature and liquid level sensitivity difference, in conjunction with responsive equation, realize the measurement simultaneously to temperature and liquid level.
Optic path order of the present invention is: the light of wideband light source 6 enters spherical structure optical fiber a2 through incidence end single-mode fiber 1, encourage higher order mode, cause the redistribution of light field, be then coupled to multimode optical fiber 3, encourage the various patterns of the fibre core in multimode optical fiber 3 and covering.The pattern meeting phase-matching condition interferes, and the interference signal of superposition is coupled in output terminal single-mode fiber 5 through spherical structure optical fiber b4 and exports.The characteristic wavelength of different interference peaks can be observed with the change of temperature, liquid level by spectroanalysis instrument.
Fig. 2 is the output signal spectrum of this Fibre Optical Sensor.At 1540-1580nm observation scope internal memory two troughs, i.e. trough 1 and trough 2, there are differences according to trough 1 and trough 2 drift value with temperature and liquid level change, can temperature be realized and liquid level is measured simultaneously.
This interferometric optical fiber sensor that the present invention proposes, just can learn the value of temperature and liquid level according to the drift value of interference peaks wavelength in transmission spectrogram, measure while achieving temperature and liquid level.It is little that this sensor has volume, and structure is simple, and make easily, low cost and other advantages, can be widely used in national defence, commercial production and the sensory field such as civil area, biological chemistry.
Claims (1)
1. the two parameteric light fiber sensors based on spherical structure and multimode optical fiber, it is characterized in that: be composed in series by incidence end single-mode fiber, spherical structure optical fiber a, interlude multimode optical fiber, spherical structure optical fiber b and exit end single-mode fiber, the front end of incidence end single-mode fiber is connected with wideband light source, the rear end of exit end single-mode fiber is connected with spectroanalysis instrument, and the diameter of incidence end single-mode fiber and exit end single-mode fiber is 125 μm; Spherical structure optical fiber a, b are discharged by single-mode fiber end face and are formed, and as mode coupler, strength of discharge is 100-130bit, and discharge time is 1700-1800ms; Core diameter 10-65 μm of interlude multimode optical fiber, length is for being 20-40mm, interlude multimode optical fiber comprises the interference peaks of different mode as the signal that sensitive zones exports, according to different interference peaks to temperature and liquid level sensitivity difference, in conjunction with responsive equation, realize the measurement simultaneously to temperature and liquid level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410530006.XA CN104236601A (en) | 2014-10-10 | 2014-10-10 | Double-parameter optical fiber sensor on basis of spherical structures and multi-mode optical fibers |
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| CN201410530006.XA CN104236601A (en) | 2014-10-10 | 2014-10-10 | Double-parameter optical fiber sensor on basis of spherical structures and multi-mode optical fibers |
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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 |
| CN106500740A (en) * | 2016-10-21 | 2017-03-15 | 天津理工大学 | A kind of Radix Triplostegiae Grandiflorae component opitical fiber sensor based on magnetic field and temperature and preparation method thereof |
| CN107063499A (en) * | 2017-04-19 | 2017-08-18 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method based on less fundamental mode optical fibre wimble structure |
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| CN107063499A (en) * | 2017-04-19 | 2017-08-18 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method based on less fundamental mode optical fibre wimble structure |
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Application publication date: 20141224 |