CN102401701B - Method of improving temperature measurement stability of fiber Bragg grating sensor system - Google Patents
Method of improving temperature measurement stability of fiber Bragg grating sensor system Download PDFInfo
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Abstract
The invention discloses a method of improving temperature measurement stability of a fiber Bragg grating sensor system, which includes determining dynamic wavelength zones of fiber Bragg grating sensors corresponding to dynamic temperature zones according to inherent center wavelength of all fiber Bragg grating sensors in channels of the fiber Bragg grating sensor system, sequentially checking spectral reflection peaks of all fiber Bragg grating sensors from the channels according to the dynamic wavelength zones of the fiber Bragg grating sensors, calculating temperature values of all fiber Bragg grating sensors from the checked reflection peaks according to correspondence of the wavelength of the reflection peaks of the fiber Bragg grating sensors to temperature, and determining position of the fiber Bragg grating sensors in the channels according to the reflection peaks corresponding to all dynamic wavelength zones.
Description
Technical field
The present invention relates to a kind of sensor temp measuring method, particularly in a kind of method that can improve temperature measurement stability of fiber Bragg grating sensor system.
Background technology
Fiber-optic grating sensor belongs to a kind of of Fibre Optical Sensor, is by extraneous physical parameter heat transfer agent to be obtained in the modulation of optical fiber Bragg wavelength based on the sensing process of fiber grating, is a kind of wavelength-modulated type Fibre Optical Sensor.Owing to compatibility natural between fiber grating and the optical fiber, be easy to a plurality of fiber gratings are connected on the optical fiber and consist of optical fiber optical grating array, realize quasi-distributed sensing, add that fiber grating has outside many advantages of ordinary optic fibre, and the transducing signal of itself is wavelength-modulated, measuring-signal is not subjected to the characteristics that light source rises and falls, bending loss of optical fiber is not affected by light source power fluctuation and system loss, so fiber grating has caused the relevant scholars' in countries in the world extensive concern and very big interest optical fiber grating temperature-measuring system characteristics in the application of sensory field.
Fiber-optic grating sensor has the advantage that other sensors can't replace, and wherein fiber-optic grating sensor is full fiber type, and the scene need not power supply, and is not subjected to the impact of electromagnetic interference (EMI) and nuclear radiation; Fibre Optical Sensor satisfies power equipment and requires measuring accuracy and resolution high to the harshness of safety and reliability, and temperature measurement accuracy is ± 0.3 ℃, and a thermometric minute rate distinguishes to be 0.01 ℃; And fast response time, have constant temperature and differential temperature alert capability; System has large capacity extension ability: follow-up dilatation need not to change main frame, only needs to increase fibre optic temperature sensor and just can realize concentrating on-line monitoring; Easy maintenance is installed fast.
But because the fiber grating demodulation device is when gathering the fiber grating reflection wavelength, that the wavelength basis size is carried out tactic, if the size order according to wavelength does not come fiber-optic grating sensor is connected in series, or carrying out in the situation in parallel, situation about disconnecting has appearred in a few fiber-optic grating sensors wherein, perhaps last several disconnections and the disappearance of certain or certain several reflection peaks in the middle of in spectrum, being shown as in the fiber-optic grating sensor of serial connection, can cause like this crosstalking and confusion of each sensing station on the whole link, so the less stable of existing fiber grating sensor system thermometric.
Traditional solution is when assembling welding, requirement comes welding according to the size order of centre wavelength, and the overtemperature fault alarm is set, all provide the configuration sequence table that dispatches from the factory accordingly for every a string FBG fiber-optic grating sensor or each group FBG sensor light fiber grating sensor in parallel, will fill in the complete methods such as erection sequence table during project installation, this process is installed complicated, and extendability is poor, installation procedure is required height, be unsuitable for the large-scale application of fiber-optic grating sensor.
Summary of the invention
The object of the present invention is to provide a kind of method that improves temperature measurement stability of fiber Bragg grating sensor system, this invention can be identified the position of each sensor corresponding to the reflectance spectrum medium wave peak that demodulates and the temperature of expression thereof, the variation that prevents spectral position causes demodulation mistake in the identification to occur, cause that sensor is chaotic, and send alerting signal.
According to an aspect of the present invention, a kind of method that improves temperature measurement stability of fiber Bragg grating sensor system is provided, comprise: A1) according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage, determine that each fiber-optic grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion;
A2) by the wavelength dynamic partition of each fiber-optic grating sensor, check successively the reflection peak in the spectrum of each fiber-optic grating sensor that is derived from described passage;
A3) according to the wavelength of the reflection peak of each fiber-optic grating sensor and the corresponding relation of temperature, calculate the temperature value of each fiber-optic grating sensor from the reflection peak that is checked through.
Particularly, according to the reflection peak corresponding to each fiber grating sensor wavelength dynamic partition, determine the position of fiber-optic grating sensor in the described passage.
Wherein steps A 1) also comprise: the number of the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage is compared;
If the number of described reflection peak is less than the number of the fiber-optic grating sensor that disposes in the described passage, the corresponding fiber-optic grating sensor of wavelength dynamic partition that then will lack reflection peak is given failure identification;
If the number of described reflection peak greater than the number of the sensor that disposes in the described passage, is then given fault value with fiber-optic grating sensors all in the described passage.
In addition, if the number of described reflection peak is less than or more than the number of the fiber-optic grating sensor that disposes in the described passage, then send alerting signal.
Wherein, the wavelength dynamic partition comprises the range of wavelengths centered by fiber-optic grating sensor centre wavelength, dynamically marks off in this range of wavelengths and normal temperature zone, overtemperature is regional and the fault zone is corresponding wavelength region may.
According to a further aspect in the invention, the present invention also provides a kind of method that improves temperature measurement stability of fiber Bragg grating sensor system, comprising:
B1) determine that according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage each light grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion;
B2) be derived from reflection peak in the spectrum of described each fiber-optic grating sensor by the wavelength dynamic partition inspection of each fiber-optic grating sensor;
B3) number with the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage compares;
B4) if the number of described reflection peak is less than the number of the fiber-optic grating sensor that disposes in the described passage, then seek the wavelength dynamic partition that lacks reflection peak, and give failure identification to the corresponding fiber-optic grating sensor of wavelength dynamic partition that lacks reflection peak that finds;
B5) if the number of described reflection peak greater than the number of the sensor that disposes in the described passage, is then given fault value with all fiber-optic grating sensors in the described passage.
Wherein, if the number of described reflection peak is less than or more than the number of the fiber-optic grating sensor that disposes in the described passage, then send alerting signal.
Particularly, according to the reflection peak wavelength of each fiber-optic grating sensor and the corresponding relation of temperature, calculate the temperature value of each fiber-optic grating sensor.
Wherein, the wavelength dynamic partition comprises the range of wavelengths centered by fiber-optic grating sensor centre wavelength, dynamically marks off in this range of wavelengths and normal temperature zone, overtemperature is regional and the fault zone is corresponding wavelength region may.
Wherein, be arranged in order each fiber-optic grating sensor in the described passage by spectrum medium wavelength size order, in the case, according to the reflection peak corresponding to each wavelength dynamic partition, determine the position of fiber-optic grating sensor in the described passage.
Compared with prior art, beneficial effect of the present invention is:
1, the present invention does not change the physical layout situation of original sensor, working temperature zone to original sensor is divided, and the work wave in definite each senor operating temperature zone, then by the work wave of each sensor of determining and the relation of temperature, can determine position and the temperature of the corresponding sensor of each reflection peak in the spectrum of demodulation in the passage.
2, the present invention has utilized position and the temperature of each sensor and its working temperature regional dynamics division methods being judged each sensor, its temperature province for each sensor is divided the program the inside that can be solidificated in each sensor setting, is convenient to the analysis to each sensor.
3, the present invention can compare for the number of sensor in the peak value of the sensor that demodulates and the passage, thereby determine in the whole frame spectrum it is other faults such as multimodal phenomenon or few peak phenomenon, and avoid to greatest extent these mistakes that whole system is impacted and damages, when guaranteeing to greatest extent wrong the generation, system still can work, and makes reflection.
Description of drawings
Fig. 1 is the particular flow sheet of the embodiment of the invention one;
Fig. 2 is the temperature province partition structure figure of fiber-optic grating sensor among the present invention;
Fig. 3 is the particular flow sheet of the embodiment of the invention two;
Fig. 4 is the overall flow figure of processes sensor fault in the embodiment of the invention two.
Embodiment
To a preferred embodiment of the present invention will be described in detail, should be appreciated that following illustrated preferred embodiment only is used for description and interpretation the present invention, is not intended to limit the present invention below in conjunction with accompanying drawing.
Embodiment one
The present invention proposes a kind of method that improves temperature measurement stability of fiber Bragg grating sensor system, specifically describe as follows:
As shown in Figure 1, improve the method for temperature measurement stability of fiber Bragg grating sensor system
S11 according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage, determines that each fiber-optic grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion;
S12 by the wavelength dynamic partition of each fiber-optic grating sensor, checks the reflection peak in the spectrum of each fiber-optic grating sensor that is derived from described passage successively;
S13 according to the wavelength of the reflection peak of each fiber-optic grating sensor and the corresponding relation of temperature, calculates the temperature value of each fiber-optic grating sensor from the reflection peak that is checked through.
The method has been utilized the unduplicated characteristics of centre wavelength of sensor in each passage, with the centre wavelength process of sensor and the conversion of temperature relation, draw temperature sensor in its operating temperature range interval with the relation of wavelength, the working temperature interval division of sensor can be divided according to actual conditions, as shown in Figure 2, the temperature province that has shown a fiber-optic grating sensor is divided, for each sensor a normal operation region and overtemperature zone and fault zone are arranged, surpass normal operation region and enter the processing of can reporting to the police of overtemperature zone or fault zone.
According to each fiber-optic grating sensor and its working temperature zone and centre wavelength information, set up the working temperature/wavelength region may of the range of wavelengths of each sensor centered by fiber-optic grating sensor centre wavelength, its working temperature/wavelength region may comprises and dynamically marking off in this range of wavelengths of this sensor as shown in Figure 2 and normal temperature zone, overtemperature is regional and the fault zone is corresponding wavelength region may, because the centre wavelength of each sensor is different, so the working temperature/wavelength region may of each sensor is also different.
Operation wavelength/the temperature range of each sensor forms corresponding a plurality of dynamic partitions in the passage in the whole frame spectrum of this passage, by with demodulation out the sensor peak value and a plurality of subregions on the whole frame spectrum compare one by one, the reflection peak of a corresponding sensor in each dynamic partition can accurately reflect the temperature value of the corresponding sensor of each subregion on the spectrum and reflection thereof.
The number of the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage is compared, when the number of reflection peak is less than the number of the fiber-optic grating sensor that disposes in the described passage, the corresponding fiber-optic grating sensor of wavelength dynamic partition that then will lack reflection peak is given failure identification and is sent warning message; The number of the sensor that disposes in greater than described passage when the number of reflection peak is then given fault value with fiber-optic grating sensors all in the described passage, and is sent warning message.
Embodiment two,
According to a further aspect in the invention, the another kind of method that improves temperature measurement stability of fiber Bragg grating sensor system of the present invention as shown in Figure 3, specifically describes as follows:
S31 determines that according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage each light grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion;
S32 is derived from the reflection peak in the spectrum of described each fiber-optic grating sensor by the wavelength dynamic partition inspection of each fiber-optic grating sensor;
S33 compares the number of the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage;
If the number of the described reflection peak of S34 is less than the number of the fiber-optic grating sensor that disposes in the described passage, then seek the wavelength dynamic partition that lacks reflection peak, and give failure identification to the corresponding fiber-optic grating sensor of wavelength dynamic partition that lacks reflection peak that finds;
If the number of the described reflection peak of S35 greater than the number of the sensor that disposes in the described passage, is then given fault value with all fiber-optic grating sensors in the described passage.
Wherein, identical with the method for embodiment one for the division of the working temperature/wavelength region may of each sensor, do not repeat them here.Solving methods of the problems analysis to the fiber-optic grating sensor reflection peak is usually as shown in the table:
By fault analysis and solution are not difficult to find out, the damage maintenance difficulty of fiber-optic grating sensor is maximum, if be checked through fast sensor and the position thereof of damage, maintenance efficiency that can the Effective Raise fiber Bragg grating sensor system, improve the fiber Bragg grating sensor system service efficiency, the present invention can determine the position at the sensor place of damage fast, prevents from causing that the normal sensor that unusual sensor back occurs is subject to serious configuration and crosstalks, the impact maintenance.
Among the present invention to the overall flow figure of processes sensor fault as shown in Figure 4, the number of wherein supposing the sensor that disposes in the passage is M, in the passage in the corresponding spectrum of sensor demodulation reflection peak number out be N, judge the fault of optical fiber upper sensor system by the size of M and N relatively.
If N=M, the number of the sensor that then arranges in the number of spectrum demodulation reflection peak out and this passage in the passage is identical, illustrates that working sensor is normal in this passage.
If N＜M, then in the passage number of spectrum demodulation reflection peak out less than the number of the sensor that arranges in this passage, be few peak phenomenon, concrete grammar is, carry out above-mentioned steps S31, S32, S33 and S34, determine to lack wavelength dynamic partition and the corresponding sensor thereof of reflection peak, and to this sensor assignment, then initiate alerting signal; To (out of order sensor assignment is-9999.9 ℃) in the passage that M sensor reading arranged, wherein the relative position of the normal sensor of reading in link is constant, and the actual geographic position of each sensor that shows in system accordingly is also constant.
If N＞M, then the number of spectrum demodulation reflection peak out is the multimodal phenomenon greater than the number of the sensor that arranges in this passage in the passage, concrete grammar is, carry out above-mentioned steps S31, S32, S33 and S35, and to all the sensors assignment in this passage, then initiate alerting signal.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. method that improves temperature measurement stability of fiber Bragg grating sensor system is characterized in that comprising:
A1) according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage, determine that each fiber-optic grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion, comprise the range of wavelengths centered by fiber-optic grating sensor centre wavelength, in this range of wavelengths, dynamically mark off and normal temperature zone, overtemperature is regional and the fault zone is corresponding wavelength region may;
A2) by the wavelength dynamic partition of each fiber-optic grating sensor, check successively the reflection peak in the spectrum of each fiber-optic grating sensor that is derived from described passage;
A3) according to the wavelength of the reflection peak of each fiber-optic grating sensor and the corresponding relation of temperature, calculate the temperature value of each fiber-optic grating sensor from the reflection peak that is checked through;
A4) according to the reflection peak corresponding to each fiber grating sensor wavelength dynamic partition, determine the position of fiber-optic grating sensor in the described passage;
A5) number with the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage compares;
If the number of described reflection peak is less than the number of the fiber-optic grating sensor that disposes in the described passage, the corresponding fiber-optic grating sensor of wavelength dynamic partition that then will lack reflection peak is given failure identification;
If the number of described reflection peak greater than the number of the sensor that disposes in the described passage, is then given fault value with fiber-optic grating sensors all in the described passage.
2. method according to claim 1 is characterized in that, if the number of described reflection peak is less than or more than the number of the fiber-optic grating sensor that disposes in the described passage, then send alerting signal.
3. method that improves temperature measurement stability of fiber Bragg grating sensor system is characterized in that comprising:
B1) determine that according to the intrinsic centre wavelength of each fiber-optic grating sensor of fiber Bragg grating sensor system passage each fiber-optic grating sensor is corresponding to the wavelength dynamic partition of temperature dynamic subregion;
B2) be derived from reflection peak in the spectrum of described each fiber-optic grating sensor by the wavelength dynamic partition inspection of each fiber-optic grating sensor;
B3) number with the fiber-optic grating sensor that disposes in the number of the reflection peak that is checked through and the described passage compares;
B4) if the number of described reflection peak is less than the number of the fiber-optic grating sensor that disposes in the described passage, then seek the wavelength dynamic partition that lacks reflection peak, and give failure identification to the corresponding fiber-optic grating sensor of wavelength dynamic partition that lacks reflection peak that finds;
B5) if the number of described reflection peak greater than the number of the sensor that disposes in the described passage, is then given fault value with all fiber-optic grating sensors in the described passage.
4. method according to claim 3 is characterized in that, if the number of described reflection peak is less than or more than the number of the fiber-optic grating sensor that disposes in the described passage, then send alerting signal.
5. method according to claim 3 is characterized in that, also comprises: according to the reflection peak wavelength of each fiber-optic grating sensor and the corresponding relation of temperature, calculate the temperature value of each fiber-optic grating sensor.
6. method according to claim 3, it is characterized in that, described wavelength dynamic partition comprises the range of wavelengths centered by fiber-optic grating sensor centre wavelength, dynamically marks off in this range of wavelengths and normal temperature zone, overtemperature is regional and the fault zone is corresponding wavelength region may.
7. method according to claim 3, it is characterized in that, be arranged in order each fiber-optic grating sensor in the described passage by spectrum medium wavelength size order, in the case, according to the reflection peak corresponding to each wavelength dynamic partition, determine the position of fiber-optic grating sensor in the described passage.
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| CN103234663B (en) * | 2013-05-17 | 2014-11-19 | 哈尔滨工业大学 | Method for calibrating optical fiber grating sensor by measuring practical pavement temperature |
| CN108303196B (en) * | 2017-12-29 | 2020-04-21 | 武汉理工光科股份有限公司 | Digital demodulation and regional temperature monitoring method and system for identical fiber bragg grating |
| CN110988603A (en) * | 2019-12-25 | 2020-04-10 | 武汉三相电力科技有限公司 | Digital differential interval protection method and system based on fiber bragg grating |
| CN111713746B (en) * | 2020-06-08 | 2024-03-15 | 深圳市康泓威科技有限公司 | Method for detecting and controlling solution temperature of electronic atomization device and electronic atomization device |
| CN113669636B (en) * | 2021-07-09 | 2023-04-18 | 安徽复盛信息科技有限公司 | Pipeline leakage monitoring method based on fiber bragg grating temperature measurement technology |
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| US20060274813A9 (en) * | 2002-06-06 | 2006-12-07 | Wei Chen | Nanoparticle thermometry and pressure sensors |
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