CN109443405A - A kind of optic fiber grating wavelength demodulating system - Google Patents
A kind of optic fiber grating wavelength demodulating system Download PDFInfo
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- 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
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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
- G01D5/35306—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
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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
- 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
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Abstract
本申请公开了一种光纤光栅波长解调系统，包括光源，光源为内周期三角波电压驱动的C波段波长扫描激光器，光源、耦合器、环形器与光纤光栅依次连接，环形器还与第一光电检测器、数据采集卡依次连接；耦合器还与干涉子系统、第二光电检测器、数据采集卡、计算机依次电连接；干涉子系统包括干涉本体和温度控制装置，温度控制装置包括半导体制冷片、控制电路和冷却风扇，干涉本体内设置有F‑P标准具、半导体制冷片和控制电路，半导体制冷片、控制电路与电源依次连接，干涉本体的外侧设置有冷却风扇。F‑P标准具可动态标定光纤光栅波长，且温度控制装置可保证F‑P标准具的温度趋于恒定，使其波长为常数，有效提高解调系统的精度与稳定性。
The present application discloses a fiber grating wavelength demodulation system, comprising a light source, the light source is a C-band wavelength scanning laser driven by an inner-period triangular wave voltage, the light source, a coupler, and a circulator are sequentially connected to the fiber grating, and the circulator is also connected to a first optoelectronic The detector and the data acquisition card are connected in sequence; the coupler is also electrically connected with the interference subsystem, the second photodetector, the data acquisition card, and the computer in sequence; the interference subsystem includes an interference body and a temperature control device, and the temperature control device includes a semiconductor refrigeration chip , a control circuit and a cooling fan, an F-P etalon, a semiconductor refrigeration chip and a control circuit are arranged in the interference body, and the semiconductor refrigeration chip, the control circuit and the power supply are connected in sequence, and a cooling fan is arranged on the outside of the interference body. The F-P etalon can dynamically calibrate the wavelength of the fiber grating, and the temperature control device can ensure that the temperature of the F-P etalon tends to be constant, so that the wavelength is constant, which effectively improves the accuracy and stability of the demodulation 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.
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