CN105092085A - Single-mode core-dislocated fiber temperature measurement method based on dual-coupling structure having correction function - Google Patents
Single-mode core-dislocated fiber temperature measurement method based on dual-coupling structure having correction function Download PDFInfo
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Abstract
The present invention discloses a single-mode core-dislocated fiber temperature measurement method based on a dual-coupling structure having the correction function. The method is conduced based on a fiber core-dislocated structure. According to the technical scheme of the invention, interference optical signals pass through a coupler to generate the laser of a particular wavelength. After that, the laser of different wavelengths correspondingly outputted at different temperatures is analyzed for the study on the performance of a temperature sensing system. The dual-coupling structure is high in resolution ratio, stable in performance and high in sensitivity. In addition, the output of the single-coupling part of a core-dislocated fiber also has the correction algorithm processing function. Therefore, the temperature measurement result is corrected. The temperature measurement precision and the temperature measurement accuracy are further improved.
Description
Technical field
The invention belongs to single mode dislocation Fiber Optic Pyrometer field, be specifically related to a kind of method of the two coupled structure single modes dislocation optical fiber measurement temperature based on band correction.
Background technology
Research at present based on the Fibre Optical Sensor of interference theory has obtained multinomial achievement in research, but also there is many problem demanding prompt solutions.The impacts such as fiber transmission attenuation, connecting loss, optical fiber vibration and multiple external environment can be subject to due to output signal, will seriously cause the irregularities of attenuated optical signal.Two-beam interference type Fibre Optical Sensor, multiple-mode interfence Fibre Optical Sensor and digital interferometric fiber optic sensors etc. are progressively applied in field of temperature measurement, but also there is many weak points, as, light path strict to the performance requirement of light source, optical fiber and signal processing system complicated, need to consider many factors.Due to the complicacy of interfering, the signal that sensor detects is very weak, and temperature resolution is not high, less stable, and these all cause cost increase and do not ensure the research of temperature sensor system.
Summary of the invention
The technical matters that the present invention solves there is provided a kind of method of the two coupled structure single modes dislocation optical fiber measurement temperature based on band correction, the method is by dislocation optical fiber structure, the light signal of interfering produces the laser of specific wavelength through coupling mechanism, then the performance of temperature-sensing system is studied by Output of laser wavelength corresponding under analysis different temperatures, two coupled structure resolution is high, stable performance and highly sensitive, the correcting algorithm processing capacity of interference data is also add in addition in the output of dislocation optical fiber list coupling unit, temperature-measuring results is calibrated, further increase precision and the accuracy of thermometric.
The present invention adopts following technical scheme for solving the problems of the technologies described above, based on the method for two coupled structure single mode dislocation optical fiber measurement temperature that band corrects, it is characterized in that concrete steps are: the light signal that 980nm pump light source sends is successively by 980/1550nm wavelength division multiplexer, multiturn single mode Er-doped fiber ring, optical isolator and dislocation optical fiber, light signal is propagated along fibre core in a fiber, when light signal starts to decompose by during dislocation fused fiber splice place, wherein a part of light signal enters covering and forms cladding mode, another part light signal enters fibre core and forms core mode, after light signal transmits a segment distance in a fiber, cladding mode and core mode are coupled in same optical fiber again, two kinds of mode optical signal interfere at fibre core, then light signal directly exports through the first fiber coupler rear portion light signal, spectroanalysis instrument is passed through after X-type photoswitch, photoelectric commutator, DSP and oscillograph carry out observation analysis, as reference amount, another part light signal passes through the optical fiber circulator selectivity output optical signal that are made up of the first fiber coupler and the second fiber coupler, export light signal after the 3rd fiber coupler wherein a part of light signal after X-type photoswitch, pass through spectroanalysis instrument, photoelectric commutator, DSP and oscillograph are observed, analyze corresponding optical maser wavelength so study this temperature system rule and as experimental amount, another part light signal enters 980/1550nm wavelength division multiplexer by optical fiber and forms feedback, when light signal interferes phenomenon again by during dislocation fused fiber splice place again, and coupling mechanism because of the dislocation optical fiber place temperature-resistant optical maser wavelength selected constant, if dislocation fiber optic temperature changes, then select the optical maser wavelength obtained that corresponding change also occurs through coupling mechanism, set different temperature, the skew of Output of laser wavelength is gathered on the one hand by spectroanalysis instrument, and to the laser signal parameter acquisition of corresponding output and storage, obtain corrected value by interference output on the other hand to correct laser wavelength measurement value, finally obtain wavelength-temperature curve according to the wavelength parameter of the corresponding Output of laser gathered in corresponding different temperatures situation and correct, and then realizing the accurate measurement to unknown temperatures.
The present invention compared with prior art has the following advantages:
(1) single-mode fiber avoids other effects many subsidiary when modal dispersion, modal noise and multimode optical fiber transmit;
(2) two coupled structure is simple, cost of manufacture is low, strong with system compatibility, Polarization Dependent Loss is little, when two coupling mechanism splitting ratios of composition wave filter and interference arm length difference get certain value, the function of the smooth interleaver of output waveform passage can be obtained, improve the stability (interleaver similar to comb filter) of system;
(3) fiber optic interferometric that misplaces during normal temperature exports and adds correcting algorithm, improves accuracy of measurement and precision;
(4) more compact structure, the small and exquisite external interference, low in energy consumption, cheap, highly sensitive of simply, not being subject to;
(5) measuring process simplifies, and can carry out continuous distribution measurement, rapidly convenient, is convenient to multiplexing.
Accompanying drawing explanation
Fig. 1 is light path principle figure of the present invention.
Drawing illustrates: 1,980nm pump light source, 2,980/1550nm wavelength division multiplexer, 3, Er-doped fiber ring, 4, optical isolator, 5, dislocation optical fiber, the 6, first fiber coupler (90:10), 7, the second fiber coupler (90:10), 8, the 3rd fiber coupler (90:10), 9, X-type photoswitch, 10, spectroanalysis instrument, 11, photoelectric commutator, 12, DSP, 13, oscillograph, 14, optical fiber.
Embodiment
Be described in further details foregoing of the present invention by the following examples, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on foregoing of the present invention all belong to scope of the present invention.
Based on the method for two coupled structure single mode dislocation optical fiber measurement temperature that band corrects, based on the interference theory of light, the light signal that 980nm pump light source 1 sends along light transmission direction successively through 980/1550nm wavelength division multiplexer 2(WDM), multiturn single mode Er-doped fiber ring 3, optical isolator 4 and single mode dislocation optical fiber 5 structure, directly export through first fiber coupler 6 part afterwards, through X-type photoswitch 9 by spectroanalysis instrument 10, photoelectric commutator 11, DSP12 and oscillograph 13 are observed, analyze, as reference amount, another part is selected to export through the optical fiber circulator of the first fiber coupler 6 and the second fiber coupler 7 composition, again through the 3rd fiber coupler 8, spectroanalysis instrument 10 is passed through through X-type photoswitch 9 in one tunnel, photoelectric commutator 11, DSP12 and oscillograph 13 are observed, analyze corresponding optical maser wavelength to study the rule of this temp measuring system, as experimental amount, another road enters 980/1550 wavelength division multiplexer 2 through optical fiber 14 and forms feedback.
Light beam transmits along fibre core in a fiber, when light signal starts to decompose by during dislocation weld, one part optical signals enters covering and forms cladding mode, another part light signal enters fibre core and forms core mode, after light signal transmits a segment distance in a fiber, cladding mode and core mode are coupled in same optical fiber again, and two kinds of pattern light beams interfere at fibre core.Now there is the light signal of multiple different wave length in fibre core, through the filtering system Output of laser with selection specific wavelength of two coupling mechanism composition.The fiber optic loop that we adopt is long is L, and have employed two identical fiber couplers.
We suppose I
1and I
2for the light intensity of core mode in single mode and the light intensity of the main mould of covering, then interference signal intensity can be expressed as:
(1)
Wherein
the difference of optical fiber,
be that effective refractive index is poor, L is the effective interference region length of dislocation optical fiber,
it is operation wavelength.When difference meets interference condition
time (m is integer), corresponding wavelength variations can be expressed as:
(2)
Known according to formula (2), the Free Spectral Range between two interference minimum value can approximate representation be:
(3)
Formula (3) shows, Free Spectral Range is relevant with the optical fiber effective length that misplaces with effective refractive index, and the change of wavelength minimum point can be expressed as:
(4)
Wherein
for thermal expansivity,
for thermo-optical coeffecient.
Temp measuring system adds photoswitch, selects interference correction output (correcting value) of dislocation optical fiber and laser temperature-measuring to export (experimental amount) respectively and measures simultaneously.Because interfere output to vary with temperature less, export so select to interfere to export for correcting.Correcting output is interference exported after opto-electronic conversion, and by adding the digital signal processor of correcting algorithm to realize the calibration of measuring accuracy, accuracy, this more gears to actual circumstances to the research realizing accurate temperature sensor-based system.Work as temperature change, spectrometer is observed Output of laser wavelength (experimental amount) and is offset, and gathers the laser signal parameter of corresponding output and stores.Then corrected to export by the interference of measuring simultaneously and Laser output is corrected, finally can obtain wavelength-Tc curve accurately according to the wavelength parameter of different temperatures and corresponding Output of laser.Therefore, experimentally result can obtain output wavelength difference through two coupling mechanism laser structure and each coefficient, and then can measure temperature value.
Embodiment above describes ultimate principle of the present invention, principal character and advantage; the technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; under the scope not departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the scope of protection of the invention.
Claims (1)
1. based on the method for two coupled structure single modes dislocation optical fiber measurement temperature of band correction, it is characterized in that concrete steps are: the light signal that 980nm pump light source sends is successively by 980/1550nm wavelength division multiplexer, multiturn single mode Er-doped fiber ring, optical isolator and dislocation optical fiber, light signal is propagated along fibre core in a fiber, when light signal starts to decompose by during dislocation fused fiber splice place, wherein a part of light signal enters covering and forms cladding mode, another part light signal enters fibre core and forms core mode, after light signal transmits a segment distance in a fiber, cladding mode and core mode are coupled in same optical fiber again, two kinds of mode optical signal interfere at fibre core, then light signal directly exports through the first fiber coupler rear portion light signal, spectroanalysis instrument is passed through after X-type photoswitch, photoelectric commutator, DSP and oscillograph carry out observation analysis, as reference amount, another part light signal passes through the optical fiber circulator selectivity output optical signal that are made up of the first fiber coupler and the second fiber coupler, export light signal after the 3rd fiber coupler wherein a part of light signal after X-type photoswitch, pass through spectroanalysis instrument, photoelectric commutator, DSP and oscillograph are observed, analyze corresponding optical maser wavelength so study this temperature system rule and as experimental amount, another part light signal enters 980/1550nm wavelength division multiplexer by optical fiber and forms feedback, when light signal interferes phenomenon again by during dislocation fused fiber splice place again, and coupling mechanism because of the dislocation optical fiber place temperature-resistant optical maser wavelength selected constant, if dislocation fiber optic temperature changes, then select the optical maser wavelength obtained that corresponding change also occurs through coupling mechanism, set different temperature, the skew of Output of laser wavelength is gathered on the one hand by spectroanalysis instrument, and to the laser signal parameter acquisition of corresponding output and storage, obtain corrected value by interference output on the other hand to correct laser wavelength measurement value, finally obtain wavelength-temperature curve according to the wavelength parameter of the corresponding Output of laser gathered in corresponding different temperatures situation and correct, and then realizing the accurate measurement to unknown temperatures.
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| CN105910727A (en) * | 2016-03-09 | 2016-08-31 | 河南师范大学 | Method for beat frequency temperature measurement by use of fiber grating filtering structure through offset fiber |
| CN106092214A (en) * | 2016-08-29 | 2016-11-09 | 北京信息科技大学 | A kind of method utilizing single mode dislocation optical fiber simultaneously to measure temperature and material strain |
| CN106289408A (en) * | 2016-08-29 | 2017-01-04 | 北京信息科技大学 | A kind of utilize single mode dislocation optical fiber measure temperature and the method for solution refractive index simultaneously |
| CN106370226A (en) * | 2016-08-29 | 2017-02-01 | 北京信息科技大学 | Method for measuring temperature and magnetic field simultaneously by utilizing single-mode mismatched fiber |
| CN106644157A (en) * | 2016-11-09 | 2017-05-10 | 苏州工业园区韵光电子科技有限公司 | Novel optical fiber temperature measuring system for electric power system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910727A (en) * | 2016-03-09 | 2016-08-31 | 河南师范大学 | Method for beat frequency temperature measurement by use of fiber grating filtering structure through offset fiber |
| CN105910727B (en) * | 2016-03-09 | 2018-11-16 | 河南师范大学 | A method of the optical fiber containing dislocation utilizes fiber grating filter structure beat frequency thermometric |
| CN106092214A (en) * | 2016-08-29 | 2016-11-09 | 北京信息科技大学 | A kind of method utilizing single mode dislocation optical fiber simultaneously to measure temperature and material strain |
| CN106289408A (en) * | 2016-08-29 | 2017-01-04 | 北京信息科技大学 | A kind of utilize single mode dislocation optical fiber measure temperature and the method for solution refractive index simultaneously |
| CN106370226A (en) * | 2016-08-29 | 2017-02-01 | 北京信息科技大学 | Method for measuring temperature and magnetic field simultaneously by utilizing single-mode mismatched fiber |
| CN106370226B (en) * | 2016-08-29 | 2018-08-17 | 北京信息科技大学 | A method of utilizing single mode dislocation optical fiber while measuring temperature and magnetic field |
| CN106644157A (en) * | 2016-11-09 | 2017-05-10 | 苏州工业园区韵光电子科技有限公司 | Novel optical fiber temperature measuring system for electric power system |
| CN106644157B (en) * | 2016-11-09 | 2022-03-11 | 苏州工业园区韵光电子科技有限公司 | Optical fiber temperature measurement system applied to power system |
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