CN109443405A - A kind of optic fiber grating wavelength demodulating system - Google Patents
A kind of optic fiber grating wavelength demodulating system Download PDFInfo
- Publication number
- CN109443405A CN109443405A CN201811529281.4A CN201811529281A CN109443405A CN 109443405 A CN109443405 A CN 109443405A CN 201811529281 A CN201811529281 A CN 201811529281A CN 109443405 A CN109443405 A CN 109443405A
- Authority
- CN
- China
- Prior art keywords
- wavelength
- fiber grating
- interference
- photoelectric detector
- etalon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 70
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004065 semiconductor Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 230000002452 interceptive effect Effects 0.000 claims abstract description 7
- 230000003595 spectral effect Effects 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013481 data capture Methods 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
- G01D5/35306—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 an interferometer arrangement
- G01D5/35309—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 an interferometer arrangement using multiple waves interferometer
- G01D5/35312—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 an interferometer arrangement using multiple waves interferometer using a Fabry Perot
-
- 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
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Communication System (AREA)
- Spectrometry And Color Measurement (AREA)
- Semiconductor Lasers (AREA)
Abstract
This application discloses a kind of optic fiber grating wavelength demodulating systems, including light source, light source is the C-band Wavelength-swept laser of interior period triangle wave voltage driving, and light source, coupler, circulator and fiber grating are sequentially connected, and circulator is also sequentially connected with the first photoelectric detector, data collecting card；Coupler is also sequentially connected electrically with interference subsystem, the second photoelectric detector, data collecting card, computer；Interfering subsystem includes interference ontology and temperature control equipment, temperature control equipment includes semiconductor chilling plate, control circuit and cooling fan, F-P etalon, semiconductor chilling plate and control circuit are provided in interference ontology, semiconductor chilling plate, control circuit and power supply are sequentially connected, and are interfered and are provided with cooling fan on the outside of ontology.F-P etalon can dynamic nominal light fibre grating wavelength, and temperature control equipment can guarantee F-P etalon temperature tend to be constant, make its wavelength constant, effectively improve the precision and stability of demodulating system.
Description
Technical field
This application involves technical field of optical fiber sensing more particularly to a kind of optic fiber grating wavelength demodulation based on linear interpolation
System.
Background technique
Fiber grating sensing technology is a research hotspot in recent years, and compared with traditional sensor, fiber grating is passed
Sensor has many advantages, such as electromagnetism interference, high sensitivity, small in size.For specific fiber-optic grating sensor, wavelength change
There are corresponding relationships with pressure with environment temperature.It therefore, is accurate measurement temperature and pressure, the wavelength interrogation technique of fiber grating
It is particularly significant.
The demodulating system of existing optic fiber grating wavelength is tunable TEA CO2 laser demodulating system.Existing tunable F-P
Filter demodulating system mainly includes the devices such as wideband light source, F-P filter, coupler, photoelectric detector.This demodulating system
Working principle be to be pasted onto the piezoelectric ceramics of F-P cavity side using triangle wave voltage driving, bring it about miniature deformation, cause
F-P cavity change of cavity length, and then change the central wavelength penetrated.
But existing this demodulating system is easy to influence since the driving voltage and wavelength of its F-P filter are non-linear
The precision of Wavelength demodulation, so that its stability is poor.In order to improve the precision of Wavelength demodulation, enhances its stability, propose one
Kind optic fiber grating wavelength demodulating system.
Summary of the invention
This application provides a kind of optic fiber grating wavelength demodulating systems, low to solve existing system medium wavelength demodulation accuracy
Technical problem.
To solve the above-mentioned problems, the application provides technical solution below:
A kind of optic fiber grating wavelength demodulating system, including light source, light source are the C-band wave of interior period triangle wave voltage driving
Long scan laser, in which: light source is electrically connected with the first end of coupler, the second end of coupler and the first end electricity of circulator
Connection, the second end of circulator are electrically connected with fiber grating, the third end of circulator and the first end electricity of the first photoelectric detector
Connection, the second end of the first photoelectric detector are electrically connected with the first end of data collecting card；The third end of coupler and interference
The first end of system is electrically connected, and interferes the second end of subsystem and the first end of the second photoelectric detector to be electrically connected, the second photoelectricity
The second end of detector is electrically connected with the second end of data collecting card, the third end of data collecting card and calculating mechatronics；It is dry
Relating to subsystem includes interference ontology and temperature control equipment, and temperature control equipment includes semiconductor chilling plate, control circuit and cold
But fan interferes in ontology and is provided with F-P etalon, semiconductor chilling plate and control circuit, F-P etalon and semiconductor refrigerating
Piece is not connected to, and semiconductor chilling plate is electrically connected with the first end of control circuit, and the second end of control circuit is electrically connected to a power source, and is done
It relates to and is provided with cooling fan on the outside of ontology.
Optionally, the shell for interfering ontology is metal-back.
Optionally, the splitting ratio of coupler is 85:15.
A kind of test method of optic fiber grating wavelength demodulating system, which is characterized in that test method includes:
Coupler will be divided into two parts by received light from light source, and this two parts of light are transferred to interference subsystem and ring respectively
Shape device；
For 15% light by interfering subsystem to be transferred to the second photoelectric detector, 85% light is transferred to light by circulator
Fine grating；
The reflected light pass of fiber grating is transferred to the first photoelectric detector to circulator, and by circulator；
The light received is converted to electric signal respectively by the first photoelectric detector and the second photoelectric detector；
Electric signal is transferred to computer by data collecting card；
Computer calculates the wavelength of fiber grating according to linear interpolation algorithm.
Optionally, computer calculates the wavelength of fiber grating according to linear interpolation algorithm, comprising:
According to the wavelength of standard queries F-P etalon, when computer calculates the detection of fiber grating and etalon spectral peak
Between；
Computer carries out linear interpolation calculating and can count as shown in formula (1) to fiber grating and two adjacent modular tool spectral peaks
Calculate the wavelength of fiber grating；
λ in formulaFBGFor the wavelength of fiber grating, λLAnd λRThe respectively wave of left standard tool spectral peak and right standard tool spectral peak
It is long, tFBG、tRAnd tLRespectively fiber grating spectral peak, the detection time of left standard tool spectral peak and right standard tool spectral peak.
The utility model has the advantages that the demodulating system includes light source, light source this application provides a kind of optic fiber grating wavelength demodulating system
For the C-band Wavelength-swept laser of interior period triangle wave voltage driving.F-P filter inside laser is driven voltage tune
System, length cyclically-varying with the variation of driving voltage of F-P cavity, so that the wavelength of output laser is with driving voltage
Change and periodically scans for C-band.The light that laser issues arrives Measurement channel and reference channel by coupler difference is defeated,
Specially light source is electrically connected with the first end of coupler, and the second end of coupler is connect with Measurement channel, the third end of coupler
It is connect with reference channel.Connection in Measurement channel is as follows: the second end of coupler is electrically connected with the first end of circulator, annular
The second end of device is electrically connected with fiber grating, and the third end of circulator is electrically connected with the first end of the first photoelectric detector, and first
The second end of photoelectric detector is electrically connected with the first end of data collecting card.Connection in reference channel is as follows: the of coupler
Three ends are electrically connected with the first end of interference subsystem, and the second end of subsystem and the first end of the second photoelectric detector is interfered to be electrically connected
It connects, the second end of the second photoelectric detector is electrically connected with the second end of data collecting card, the third end of data collecting card and calculating
Mechatronics.Use process: the light issued from Wavelength-swept laser is divided into two by the coupler that splitting ratio is 85:15
Point, 15% light enters the second photoelectric detector by reference to the F-P etalon in channel, and 85% light enters Measurement channel,
Enter fiber grating by circulator, the reflected light of fiber grating is again introduced into circulator and propagates and enter the first Photoelectric Detection
Device.Received light is converted to electric signal by the first photoelectric detector and the second photoelectric detector, and is passed through data collecting card and transmitted
It is handled to computer.Due to characteristics such as F-P cavity hysteresis, creep properties and temperature changes, leads to Output of laser wavelength and drive
Dynamic voltage is in non-critical linear.Therefore, F-P etalon being introduced in interference subsystem, dynamic mark is carried out to optic fiber grating wavelength
It is fixed.Light source light spectrum is divided into multiple pectination intervals by F-P etalon, and Output of laser wavelength and driving voltage can be regarded as in each interval
Linear relationship.Interfering subsystem includes interference ontology and temperature control equipment, and temperature control equipment includes semiconductor chilling plate, control
Circuit processed and cooling fan interfere in ontology and are provided with F-P etalon, semiconductor chilling plate and control circuit, F-P etalon with
Semiconductor chilling plate is not connected to, and semiconductor chilling plate is electrically connected with the first end of control circuit, the second end and electricity of control circuit
Source electrical connection, interferes and is provided with cooling fan on the outside of ontology.In use process, control circuit is according to interference subsystem internal
Temperature controls semiconductor chilling plate effect, so that the temperature in interference subsystem tends towards stability.Cooling fan is mounted on interference originally
In vitro, heat can be taken away when the temperature rises, further such that the temperature of F-P etalon tends to be constant, make the wave of F-P etalon
A length of constant.In the application, Wavelength-swept laser is capable of providing higher output power；F-P etalon can dynamic nominal light
Fine grating wavelength calculates the wavelength of fiber grating using linear interpolation；Control circuit, semiconductor chilling plate in interference subsystem
It can guarantee that the temperature of F-P etalon tends to be constant with temperature control equipments such as cooling fans, make its wavelength constant, thus effectively
Improve the precision and stability of demodulating system.In the application, interfere the F-P etalon in subsystem can dynamic nominal light fibre grating
Wavelength, and temperature control equipment can guarantee that the temperature of F-P etalon tends to be constant, make its wavelength constant, to effectively improve
The precision and stability of demodulating system.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for optic fiber grating wavelength demodulating system that application provides；
Fig. 2 is a kind of structural schematic diagram for interference subsystem that application provides；
Fig. 3 is the test result figure for the F-P etalon temperature data that application provides；
Fig. 4 is the test result figure of optic fiber grating wavelength demodulating system provided by the present application；
Detailed description of the invention: 1- light source, 2- coupler, 3- circulator, 4- fiber grating, the first photoelectric detector of 5-, 6- data
Capture card, 7- interference subsystem, the second photoelectric detector of 8-, 9- computer, 71- interference ontology, 72- temperature control equipment,
711-F-P etalon, 721- semiconductor chilling plate, 722- control circuit, 723- cooling fan.
Specific embodiment
Fig. 1 is a kind of structural schematic diagram of optic fiber grating wavelength demodulating system provided by the present application, and Fig. 2 provides for the application
A kind of interference subsystem structural schematic diagram, referring to Fig. 1 and Fig. 2 it is found that this application provides a kind of optic fiber grating wavelength solutions
Adjusting system, the demodulating system include light source 1, and light source 1 is the C-band Wavelength-swept laser of interior period triangle wave voltage driving.
F-P filter inside laser is driven voltage modulated, length cyclically-varying with the variation of driving voltage of F-P cavity,
So that the wavelength of output laser periodically scans for C-band with the variation of driving voltage.The light warp that laser issues
Overcoupling device 2 is distinguished defeated to Measurement channel and reference channel, and specially light source 1 is electrically connected with the first end of coupler 2, coupler
2 second end is connect with Measurement channel, and the third end of coupler 2 is connect with reference channel.Connection in Measurement channel is as follows: coupling
The second end of clutch 2 is electrically connected with the first end of circulator 3, and the second end of circulator 3 is electrically connected with fiber grating 4, circulator 3
Third end be electrically connected with the first end of the first photoelectric detector 5, the second end of the first photoelectric detector 5 and data collecting card 6
First end electrical connection.Connection in reference channel is as follows: the third end of coupler 2 and the first end of interference subsystem 7 are electrically connected
It connects, the second end of interference subsystem 7 is electrically connected with the first end of the second photoelectric detector 8, the second end of the second photoelectric detector 8
It is electrically connected with the second end of data collecting card 6, the third end of data collecting card 6 is connect with electromechanics 9 is calculated.Use process: from wave
It is two parts that the coupler 2 that the light that long scan laser issues is 85:15 by splitting ratio, which divides, and 15% light is by reference to channel
In F-P etalon 711 enter the second photoelectric detector 8,85% light enters Measurement channel, enters optical fiber by circulator 3
Grating 4, the reflected light of fiber grating 4 are again introduced into circulator 3 and propagate and enter the first photoelectric detector 5.First Photoelectric Detection
Received light is converted to electric signal by device 5 and the second photoelectric detector 8, and is transmitted to the progress of computer 9 by data collecting card 6
Processing.Due to characteristics such as F-P cavity hysteresis, creep properties and temperature changes, cause Output of laser wavelength and driving voltage in non-tight
Ruling.Therefore, F-P etalon 711 being introduced in interference subsystem 7, dynamic calibration is carried out to 4 wavelength of fiber grating.F-P mark
Light source light spectrum is divided into multiple pectination intervals by quasi- tool 711, and Output of laser wavelength and driving voltage can be regarded as linearly in each interval
Relationship.Interfering subsystem 7 includes interference ontology 71 and temperature control equipment 72, and temperature control equipment 72 includes semiconductor chilling plate
721, control circuit 722 and cooling fan 723 interfere in ontology 71 and are provided with F-P etalon 711,721 and of semiconductor chilling plate
Control circuit 722, F-P etalon 711 are not connected to semiconductor chilling plate 721, semiconductor chilling plate 721 and control circuit 722
First end electrical connection, the second end of control circuit 722 is electrically connected to a power source, and the outside of interference ontology 71 is provided with cooling fan
723.In use process, control circuit 722 is acted on according to the temperature control semiconductor chilling plate 721 inside interference subsystem 71,
So that the temperature in interference subsystem 7 tends towards stability.Cooling fan 723 is mounted on outside interference ontology 41, can be when the temperature rises
Heat is taken away, further such that the temperature of F-P etalon 711 tends to be constant, makes the wavelength constant of F-P etalon 711.This Shen
Please in, Wavelength-swept laser is capable of providing higher output power；F-P etalon 711 can 4 wave of dynamic nominal light fibre grating
It is long, the wavelength of fiber grating 4 is calculated using linear interpolation；Control circuit 722, semiconductor chilling plate 721 in interference subsystem 7
It can guarantee that the temperature of F-P etalon 711 tends to be constant with the equal temperature control equipments 72 of cooling fan 723, make its wavelength constant,
To effectively improve the precision and stability of demodulating system.In the application, interfere the F-P etalon 711 in subsystem 7 can dynamic
4 wavelength of fiber grating is demarcated, and temperature control equipment 72 can guarantee that the temperature of F-P etalon 711 tends to be constant, make its wavelength
Constant, to effectively improve the precision and stability of demodulating system.
In order to facilitate the temperature of control interference ontology 71, in the present embodiment, the shell of interference ontology 71 is metal-back.Metal
It is good with thermal conductivity, and the advantages of be hardly damaged, the shell of interference ontology 71 is metal-back, not only facilitates control interference ontology 71
Temperature, make its stability enhance；The F-P etalon in interference ontology 71 can also be protected, its service life is improved.
In the application, other than providing a kind of optic fiber grating wavelength demodulating system, a kind of fiber grating wave is additionally provided
The test method of long demodulating system, test method include:
S01: coupler will receive from light source is divided into two parts, and this two parts of light are transferred to interference subsystem and ring respectively
Shape device；
Interference subsystem belongs to reference channel, and circulator belongs to Measurement channel.
By interfering subsystem to be transferred to the second photoelectric detector, 85% light is transmitted the light of S02:15% by circulator
To fiber grating；
S03: the reflected light pass of fiber grating is transferred to the first photoelectric detector to circulator, and by circulator；
The light received is converted to electric signal respectively by the S04: the first photoelectric detector and the second photoelectric detector；
S05: electric signal is transferred to computer by data collecting card；
S06: computer calculates the wavelength of fiber grating according to linear interpolation algorithm.
According to the wavelength of standard queries F-P etalon, when computer calculates the detection of fiber grating and etalon spectral peak
Between；
Computer carries out linear interpolation calculating and can count as shown in formula (1) to fiber grating and two adjacent modular tool spectral peaks
Calculate the wavelength of fiber grating；
λ in formulaFBGFor the wavelength of fiber grating, λLAnd λRThe respectively wave of left standard tool spectral peak and right standard tool spectral peak
It is long, tFBG、tRAnd tLRespectively fiber grating spectral peak, the detection time of left standard tool spectral peak and right standard tool spectral peak.
The effect realized in order to better illustrate the present invention illustrates optic fiber grating wavelength demodulating system below with reference to example
Experiment effect.First verify that the temperature stability of the F-P etalon with temperature control equipment, the temperature control of established standards tool exists
23 DEG C, continuance test 24 hours or more, the temperature data of etalon is exported by temperature control equipment, is the application referring to Fig. 3
The test result figure of the F-P etalon temperature data of offer.
It can be seen that the temperature of etalon controls within ± 0.01 DEG C, therefore can guarantee that the wavelength of etalon is constant,
Improve the stability of optic fiber grating wavelength demodulating system.
Optic fiber grating wavelength demodulating system proposed by the present invention is connect with fiber grating single channel.To verify fiber grating
Fiber grating is placed in the water-bath that temperature fluctuation amplitude is ± 0.01 DEG C/1h, holds by the stability of Wavelength demodulation system, experiment
Continuous test 24 hours or more, be the test result figure of optic fiber grating wavelength demodulating system provided by the present application referring to fig. 4.
It can be seen that the wavelength of fiber grating in for 24 hours in 0.3pm in the range of fluctuate, and wavelength is near fixed value
Fluctuation, rather than only change in one direction, therefore in the performance steady in a long-term of optic fiber grating wavelength demodulating system interior for 24 hours
For ± 0.15pm, stability with higher.
Those skilled in the art will readily occur to its of the application after considering the embodiment of specification and practice here
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the not used common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (5)
1. a kind of optic fiber grating wavelength demodulating system, which is characterized in that including light source (1), the light source (1) is interior periodic trigonometric
The C-band Wavelength-swept laser of wave voltage driving, in which:
The light source (1) is electrically connected with the first end of coupler (2), and the of the second end of the coupler (2) and circulator (3)
One end electrical connection, the second end of the circulator (3) is electrically connected with fiber grating (4), the third end of the circulator (3) and the
The first end of one photoelectric detector (5) is electrically connected, second end and data collecting card (6) of first photoelectric detector (5)
First end electrical connection；
The third end of the coupler (2) be electrically connected with the first end of interference subsystem (7), it is described interfere subsystem (7) the
Two ends are electrically connected with the first end of the second photoelectric detector (8), the second end and the data of second photoelectric detector (8)
The second end of capture card (6) is electrically connected, and the third end of the data collecting card (6) is electrically connected with computer (9)；
The interference subsystem (7) includes interference ontology (71) and temperature control equipment (72), the temperature control equipment (72)
Including semiconductor chilling plate (721), control circuit (722) and cooling fan (723), F- is provided in the interference ontology (71)
P etalon (711), semiconductor chilling plate (721) and control circuit (722), the F-P etalon (711) and the semiconductor
Cooling piece (721) is not connected to, and the semiconductor chilling plate (721) is electrically connected with the first end of control circuit (722), the control
The second end of circuit (722) is electrically connected to a power source, and is provided with cooling fan (723) on the outside of the interference ontology (71).
2. demodulating system according to claim 1, which is characterized in that the shell of interference ontology (71) is metal-back.
3. demodulating system according to claim 1, which is characterized in that the splitting ratio of the coupler (2) is 85:15.
4. a kind of test method of optic fiber grating wavelength demodulating system, which is characterized in that the test method includes:
Coupler will be divided into two parts by received light from light source, and this two parts of light are transferred to interference subsystem and annular respectively
Device；
For 15% light by interfering subsystem to be transferred to the second photoelectric detector, 85% light is transferred to optical fiber light by circulator
Grid；
The reflected light pass of fiber grating is transferred to the first photoelectric detector to circulator, and by circulator；
The light received is converted to electric signal respectively by the first photoelectric detector and the second photoelectric detector；
Electric signal is transferred to computer by data collecting card；
Computer calculates the wavelength of fiber grating according to linear interpolation algorithm.
5. test method according to claim 4, which is characterized in that the computer calculates light according to linear interpolation algorithm
The wavelength of fine grating, comprising:
According to the wavelength of standard queries F-P etalon, computer calculates the detection time of fiber grating and etalon spectral peak；
Computer carries out linear interpolation calculating and can calculate as shown in formula (1) to fiber grating and two adjacent modular tool spectral peaks
The wavelength of fiber grating；
λ in formulaFBGFor the wavelength of fiber grating, λLAnd λRThe respectively wavelength of left standard tool spectral peak and right standard tool spectral peak,
tFBG、tRAnd tLRespectively fiber grating spectral peak, the detection time of left standard tool spectral peak and right standard tool spectral peak.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811529281.4A CN109443405A (en) | 2018-12-13 | 2018-12-13 | A kind of optic fiber grating wavelength demodulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811529281.4A CN109443405A (en) | 2018-12-13 | 2018-12-13 | A kind of optic fiber grating wavelength demodulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109443405A true CN109443405A (en) | 2019-03-08 |
Family
ID=65558861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811529281.4A Pending CN109443405A (en) | 2018-12-13 | 2018-12-13 | A kind of optic fiber grating wavelength demodulating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109443405A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050269489A1 (en) * | 2004-06-04 | 2005-12-08 | Domino Taverner | Optical wavelength determination using multiple measurable features |
| CN101762557A (en) * | 2009-10-28 | 2010-06-30 | 天津大学 | Gas category classification method and classification device based on active inner cavity absorption spectrum |
| CN202267882U (en) * | 2011-09-20 | 2012-06-06 | 华北电力大学（保定） | Reference grating and F-P etalon temperature controlling apparatus |
| CN102879022A (en) * | 2012-09-25 | 2013-01-16 | 杭州联光电子有限公司 | Method and device for demodulating fiber bragg grating (FBG) sensor |
| CN103411686A (en) * | 2013-08-27 | 2013-11-27 | 天津大学 | Device and method for calibrating optical fiber scanning light source wavelength based on gas absorption spectral lines |
| CN103528607A (en) * | 2013-10-24 | 2014-01-22 | 宁波振东光电有限公司 | FBG (fiber bragg grating) interrogator |
| CN203422098U (en) * | 2013-09-18 | 2014-02-05 | 哈尔滨理工大学 | DFB laser-based FBG wavelength demodulator |
| US8731018B2 (en) * | 2011-01-27 | 2014-05-20 | Mitsubishi Electric Corporation | Semiconductor laser |
| CN104180921A (en) * | 2014-07-29 | 2014-12-03 | 天津大学 | Temperature and stress measuring device based on orthogonal dual-polarization fiber laser |
| CN104457803A (en) * | 2014-11-28 | 2015-03-25 | 中南大学 | Wave length demodulating system and method based on F-P etalon and reference gratings |
| CN104931081A (en) * | 2015-06-10 | 2015-09-23 | 天津大学 | Composite wavelength reference-based fiber bragg grating sensing demodulation device and method |
| CN205957991U (en) * | 2016-07-14 | 2017-02-15 | 青岛派科森光电技术股份有限公司 | Fiber grating demodulation instrument |
| CN106940220A (en) * | 2016-01-04 | 2017-07-11 | 中国计量学院 | A kind of wavelength real-time measurement apparatus of Simple low-cost |
| CN107065619A (en) * | 2017-05-15 | 2017-08-18 | 武汉光迅科技股份有限公司 | The wavelength control electrode parameter establishing method and device of a kind of tunable laser |
| CN107843744A (en) * | 2017-10-27 | 2018-03-27 | 中南大学 | The Wavelength demodulation system and Wavelength demodulation method of optical fibre grating acceleration sensor |
| CN108507697A (en) * | 2018-02-28 | 2018-09-07 | 华北电力大学（保定） | A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor |
-
2018
- 2018-12-13 CN CN201811529281.4A patent/CN109443405A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050269489A1 (en) * | 2004-06-04 | 2005-12-08 | Domino Taverner | Optical wavelength determination using multiple measurable features |
| CN101762557A (en) * | 2009-10-28 | 2010-06-30 | 天津大学 | Gas category classification method and classification device based on active inner cavity absorption spectrum |
| US8731018B2 (en) * | 2011-01-27 | 2014-05-20 | Mitsubishi Electric Corporation | Semiconductor laser |
| CN202267882U (en) * | 2011-09-20 | 2012-06-06 | 华北电力大学（保定） | Reference grating and F-P etalon temperature controlling apparatus |
| CN102879022A (en) * | 2012-09-25 | 2013-01-16 | 杭州联光电子有限公司 | Method and device for demodulating fiber bragg grating (FBG) sensor |
| CN103411686A (en) * | 2013-08-27 | 2013-11-27 | 天津大学 | Device and method for calibrating optical fiber scanning light source wavelength based on gas absorption spectral lines |
| CN203422098U (en) * | 2013-09-18 | 2014-02-05 | 哈尔滨理工大学 | DFB laser-based FBG wavelength demodulator |
| CN103528607A (en) * | 2013-10-24 | 2014-01-22 | 宁波振东光电有限公司 | FBG (fiber bragg grating) interrogator |
| CN104180921A (en) * | 2014-07-29 | 2014-12-03 | 天津大学 | Temperature and stress measuring device based on orthogonal dual-polarization fiber laser |
| CN104457803A (en) * | 2014-11-28 | 2015-03-25 | 中南大学 | Wave length demodulating system and method based on F-P etalon and reference gratings |
| CN104931081A (en) * | 2015-06-10 | 2015-09-23 | 天津大学 | Composite wavelength reference-based fiber bragg grating sensing demodulation device and method |
| CN106940220A (en) * | 2016-01-04 | 2017-07-11 | 中国计量学院 | A kind of wavelength real-time measurement apparatus of Simple low-cost |
| CN205957991U (en) * | 2016-07-14 | 2017-02-15 | 青岛派科森光电技术股份有限公司 | Fiber grating demodulation instrument |
| CN107065619A (en) * | 2017-05-15 | 2017-08-18 | 武汉光迅科技股份有限公司 | The wavelength control electrode parameter establishing method and device of a kind of tunable laser |
| CN107843744A (en) * | 2017-10-27 | 2018-03-27 | 中南大学 | The Wavelength demodulation system and Wavelength demodulation method of optical fibre grating acceleration sensor |
| CN108507697A (en) * | 2018-02-28 | 2018-09-07 | 华北电力大学（保定） | A kind of sea water temperature depth profile sampling towed system based on Fibre Optical Sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105606193B (en) | Fabry-perot optical fiber acoustic vibration sensing device and demodulation method based on double tunable optical sources | |
| Xiao et al. | Single-crystal sapphire fiber-based strain sensor for high-temperature applications | |
| CN103940361B (en) | A kind of fiber grating low frequency strain sensing demodulating system | |
| CN109186643B (en) | Accurate sensing system and sensing method based on reflection function resonant filter | |
| CN104101447A (en) | Distributed optical fiber temperature sensor and method for removing nonlinear error of same | |
| CN104215368A (en) | F-P cavity optical fiber pressure sensing device and demodulation method thereof | |
| CN106225816B (en) | A kind of grating sensing apparatus and method based on Brillouin's wave filter | |
| WO2023051554A1 (en) | Optical sensing demodulation module and optical sensing system | |
| CN102914423A (en) | Measuring device and method for sag frequency of dispersion optical fiber | |
| CN104390723A (en) | Multi-wavelength Brillouin fiber laser based optical fiber temperature sensor | |
| CN106840224B (en) | Fiber Bragg grating demodulation system based on electro-absorption modulator and peak searching method | |
| CN107941254A (en) | A kind of fiber grating sensing system and its demodulation method | |
| CN107036732A (en) | Sliding bearing lubricating oil film thickness and the fibre optical sensor of temperature can be detected simultaneously | |
| CN109443405A (en) | A kind of optic fiber grating wavelength demodulating system | |
| CN206930377U (en) | Based on narrow band laser demodulating fiber bragg grating temp measuring system | |
| CN108955970B (en) | Micro-stress sensor for bridge monitoring | |
| CN103344265A (en) | Fiber bragg grating demodulation instrument | |
| CN201716502U (en) | Bragg grating high-speed demodulating system based on cascading long-period fiber bragg grating | |
| CN206161145U (en) | Distributed optical fiber vibration sensing system | |
| CN208672181U (en) | A kind of temperature measuring equipment carrying out distributed sensing using fiber grating | |
| CN209525030U (en) | A kind of optical pressure sensor | |
| CN208140864U (en) | A kind of shelf depreciation ultrasound measurement system based on distributed light sensing array mould group | |
| CN102980598A (en) | Fiber Bragg grating (FBG) demodulator | |
| CN208653669U (en) | A kind of binary channels distributed fiber optic temperature and strain sensing system | |
| CN206177328U (en) | Optic fibre microcavity sensor demodulating equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190308 |
|
| RJ01 | Rejection of invention patent application after publication |