CN106441385B - Wavelength is entirely the same as optical fiber grating spectrum demodulation method and system - Google Patents
Wavelength is entirely the same as optical fiber grating spectrum demodulation method and system Download PDFInfo
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- CN106441385B CN106441385B CN201610782928.9A CN201610782928A CN106441385B CN 106441385 B CN106441385 B CN 106441385B CN 201610782928 A CN201610782928 A CN 201610782928A CN 106441385 B CN106441385 B CN 106441385B
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- 238000001228 spectrum Methods 0.000 title claims abstract description 107
- 239000013307 optical fiber Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 67
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35383—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
- G01D5/35387—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention discloses a kind of wavelength entirely with optical fiber grating spectrum demodulation method and system, and wherein method includes the following steps：The spectrum with fiber grating in normal conditions entirely is sampled, is recorded and saved as standard spectrum S0；The spectrum with fiber grating under current state entirely is sampled, is recorded and saved as current light spectrum S1；Current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference=S1‑S0；Calculate standard spectrum S0With difference spectrum SDifferencePeak position；According to standard spectrum S0With difference spectrum SDifferencePeak position calculate the wavelength X with optic fiber grating wavelength in normal conditions entirely0With the wavelength X under current state1.The present invention can be achieved to the monitoring of optic fiber grating wavelength minor change, solves the problems, such as entirely entirely with optic fiber grating wavelength parsing.
Description
Technical field
The present invention relates to fiber grating field more particularly to a kind of wavelength with optical fiber grating spectrum demodulation method and to be entirely
System.
Background technique
Fiber-optic grating sensor has a wide range of applications in the monitorings such as fire, structural health field.Compared to traditional
Sensing technology, fiber grating can carry out array monitoring by way of wavelength-division multiplex, i.e., by the fiber grating of different wave length
Sensor is concatenated, and wider coverage area is formed.But the mode of wavelength-division multiplex is still limited by fiber Bragg grating (FBG) demodulator table
Wave-length coverage.Such as demodulation instrument wave-length coverage is 40nm, and the region of 2nm is reserved for each sensor, then is at most only capable of carrying
The fiber-optic grating sensor of 20 different wave lengths.In practical applications, such as storage tank, tunnel large-range fire disaster monitor system, lead to
Often only regional temperature is needed to monitor, does not need higher positioning accuracy, therefore using the fiber-optic grating sensor face of wavelength-division multiplex
Face sensing scope and the dual limited problem of sensor density.
To solve the above problems, multiple in wavelength-division it is expected that more sensors can be measured with a fiber grating demodulation device
On the basis of, come into being entirely with optical fiber grating region monitoring scheme.It is exactly entirely to choose a series of middle cardiac waves with fiber grating
Long identical multiple fiber grating series connection, a monitoring region uses the fiber-optic grating sensor of the same band, makes distance sensing
Have and is multiplied.But since with the overlapping of the central wavelength of fiber grating, how discrimination changed wavelength is the technology entirely
Difficult point.
Summary of the invention
The present invention proposes the method for spectrum difference, realizes to complete for the difficult point demodulated entirely with optic fiber grating wavelength
With the monitoring of optic fiber grating wavelength minor change, solve the problems, such as to parse with optic fiber grating wavelength entirely.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of wavelength is provided entirely with optical fiber grating spectrum demodulation method, is included the following steps：
The spectrum with fiber grating in normal conditions entirely is sampled, is recorded and saved as standard spectrum S0；
The spectrum with fiber grating under current state entirely is sampled, is recorded and saved as current light spectrum S1；
Current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference=S1-S0；
Calculate standard spectrum S0With difference spectrum SDifferencePeak position；
According to standard spectrum S0With difference spectrum SDifferencePeak position calculate entirely with optic fiber grating wavelength in normal conditions
Wavelength X0With the wavelength X under current state1。
The present invention also provides a kind of based on wavelength entirely with the optical fiber grating regulating system of optical fiber grating spectrum, including：
Grating spectrum demarcating module, for sampling the spectrum with fiber grating in normal conditions entirely, record and save for
Standard spectrum S0；And the spectrum with fiber grating under current state entirely is sampled, it records and saves as current light spectrum S1；
Grating spectrum difference block is used for current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference=
S1-S0；
Optical grating reflection peak judgment module, for calculating standard spectrum S0With difference spectrum SDifferencePeak position；
Full co-wavelength computing module, for according to standard spectrum S0With difference spectrum SDifferencePeak position calculating share the same light entirely
The wavelength X of fine grating in normal conditions0With the wavelength X under current state1。
Third technical solution of the invention is based on wavelength entirely with the monitoring device of optical fiber grating spectrum, including fiber grating
Demodulate the complete same fiber grating of instrument and multiple concatenations；
It entirely include the identical fiber-optic grating sensor of multiple central wavelengths of concatenation, different complete same optical fiber with fiber grating
Grating is placed in different monitoring regions；
The fiber Bragg grating (FBG) demodulator table includes above system.
The beneficial effect comprise that：The present invention combines by wavelength-division multiplex and entirely with fiber grating, in difference
Monitoring region in using different central wavelengths complete same optical fiber optical grating array, in a monitoring region, concatenation central wavelength
Identical fiber grating increases coverage area, and proposes the method for spectrum difference, realizes to complete same optic fiber grating wavelength
The monitoring of minor change.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is fiber grating wavelength-division multiplex concatenation schematic diagram；
Fig. 2 is that wavelength-division multiplex adds entirely with optical fiber grating region monitoring schematic diagram；
Fig. 3 is provided by the invention entirely with the block diagram of optical fiber grating spectrum analysis method；
Fig. 4 is provided by the invention entirely with the flow chart of optical fiber grating spectrum analysis method；
Fig. 5 be it is provided by the invention entirely with 20 DEG C of fiber grating when spectrogram；
Fig. 6 is the spectrum provided in an embodiment of the present invention when being heated to 23 DEG C with some sensor in fiber grating entirely
Figure；
Fig. 7 is the spectral differences provided in an embodiment of the present invention when being heated to 23 DEG C with some sensor in fiber grating entirely
Component.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
The wavelength of the embodiment of the present invention is entirely with optical fiber grating spectrum demodulation method, as shown in figure 4, including the following steps：
The spectrum with fiber grating in normal conditions entirely is sampled, is recorded and saved as standard spectrum S0；Standard state：Entirely
The state being placed in fiber grating under room temperature.
The spectrum with fiber grating under current state entirely is sampled, is recorded and saved as current light spectrum S1；
Current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference=S1-S0；
Calculate standard spectrum S0With difference spectrum SDifferencePeak position；
According to standard spectrum S0With difference spectrum SDifferencePeak position calculate entirely with optic fiber grating wavelength in normal conditions
Wavelength X0With the wavelength X under current state1。
The embodiment of the present invention is based on wavelength entirely with the optical fiber grating regulating system of optical fiber grating spectrum, it can be achieved that above-mentioned side
Method, as shown in figure 3, the system specifically includes：
Grating spectrum demarcating module 31 is recorded and saved for sampling the spectrum with fiber grating in normal conditions entirely
For standard spectrum S0；And the spectrum with fiber grating under current state entirely is sampled, it records and saves as current light spectrum S1；
Grating spectrum difference block 32 is used for current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference
=S1-S0；
Optical grating reflection peak judgment module 33, for calculating standard spectrum S0With difference spectrum SDifferencePeak position；
Full co-wavelength computing module 34, for according to standard spectrum S0With difference spectrum SDifferencePeak position calculate it is complete same
The wavelength X of fiber grating in normal conditions0With the wavelength X under current state1。
The present embodiment by entirely with fiber grating temperature measuring application for.Fig. 1 is the optical fiber light formed using wave division multiplex mode
Gate sensor array, each sensor are all made of only one wavelength.In order to which the above method and system are applied in actual scene,
It realizes wavelength-division multiplex and entirely with the combination of fiber grating, wavelength-division multiplex and full co-wavelength fiber grating area monitoring sensing can be used
Device array, i.e., in a monitoring region, the identical fiber grating of concatenation wavelength.It can be according to area size, the optical fiber light of concatenation
Grid quantity can also be different.Therefore, coverage area is increased using full co-wavelength fiber grating scheme.
As shown in Fig. 2, the embodiment of the present invention includes full optical fiber light with the monitoring device of optical fiber grating spectrum based on wavelength
The complete same fiber grating of grid demodulation instrument and multiple concatenations；It entirely include the identical light of multiple central wavelengths of concatenation with fiber grating
Fiber grating sensor, different complete same fiber gratings are placed in different monitoring regions；The fiber Bragg grating (FBG) demodulator table includes upper
The system for stating embodiment.
Grating spectrum demarcating module 1 is to entirely with fiber grating in temperature T0Spectrum at=20 DEG C carries out record and saves as S0
(as shown in Figure 5).Will certain temperature T be heated to some sensor in fiber grating entirely1When spectrum S1(as shown in Figure 6),
Grating spectrum difference block 32 is by spectrum S entirely current with fiber grating1Subtract the S of the preservation of grating spectrum demarcating module 310It obtains
As a result SDifferenceThat is SDifference=S1-S0(as shown in Figure 7).
Optical grating reflection peak judgment module 33 is to spectroscopic data S0With spectrum differential data SDifferenceNear optical grating reflection jag part
The time of 17 sampled datas carries out power weightings and averagely obtains S0And SDifferencePeak position t0And t1(it is as shown in formula 1, wherein
PiAnd tiThe respectively power of sampled data and time).
Full co-wavelength computing module 34 is respectively according to spectroscopic data S0With spectrum differential data SDifferenceCorresponding peak position t0
And t1, peak position is substituted into wavelength linear equation λ (t)=0.02t+1530 and calculates temperature T0Down entirely with optic fiber grating wavelength λ0
=1535.968nm and current complete same optic fiber grating wavelength λ1=1535.998nm.
Finally, according to the corresponding relationship of optic fiber grating wavelength and temperature, such as 1 degree of temperature change, wavelength change 10pm.It can be with
It calculates current entirely with the temperature T of fiber grating1=23 DEG C.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (3)
1. a kind of wavelength is entirely the same as optical fiber grating spectrum demodulation method, which is characterized in that include the following steps：
The spectrum with fiber grating in normal conditions entirely is sampled, is recorded and saved as standard spectrum S0；
The spectrum with fiber grating under current state entirely is sampled, is recorded and saved as current light spectrum S1；
Current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference= S1 - S0；
Calculate standard spectrum S0With difference spectrum SDifferencePeak position；
According to standard spectrum S0With difference spectrum SDifferencePeak position calculate the wave with optic fiber grating wavelength in normal conditions entirely
Long λ0With the wavelength X under current state1。
2. it is a kind of based on wavelength entirely with the optical fiber grating regulating system of optical fiber grating spectrum, which is characterized in that including：
Grating spectrum demarcating module is recorded and saved for sampling the spectrum with fiber grating in normal conditions entirely as standard
Spectrum S0；And the spectrum with fiber grating under current state entirely is sampled, it records and saves as current light spectrum S1；
Grating spectrum difference block is used for current light spectrum S1Subtract standard spectrum S0, obtain difference spectrum SDifference, SDifference= S1 -
S0；
Optical grating reflection peak judgment module, for calculating standard spectrum S0With difference spectrum SDifferencePeak position；
Full co-wavelength computing module, for according to standard spectrum S0With difference spectrum SDifferencePeak position calculate complete same fiber grating
Wavelength X in normal conditions0With the wavelength X under current state1。
3. it is a kind of based on wavelength entirely with the monitoring device of optical fiber grating spectrum, which is characterized in that including fiber Bragg grating (FBG) demodulator table
With the complete same fiber grating of multiple concatenations；
It entirely include the identical fiber-optic grating sensor of multiple central wavelengths of concatenation, different complete same fiber gratings with fiber grating
It is placed in different monitoring regions；
The fiber Bragg grating (FBG) demodulator table includes system as claimed in claim 2.
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| CN108054629A (en) * | 2017-12-30 | 2018-05-18 | 武汉理工光科股份有限公司 | Pulse laser generator and method based on F-P |
| CN108548548B (en) * | 2018-05-09 | 2019-08-20 | 武汉理工大学 | Based on intensively entirely with the demodulation method of grating subregion sensing |
| CN111579114B (en) | 2020-05-09 | 2021-03-26 | 武汉理工大学 | Fiber grating sensing method applied to small-size fire source monitoring |
| WO2024091127A1 (en) * | 2022-10-26 | 2024-05-02 | Victoria Link Limited | Improved optical fibre sensing |
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