CN109900383A - Fiber temperature signal automatic gain device and fiber optic temperature (FBG) demodulator - Google Patents
Fiber temperature signal automatic gain device and fiber optic temperature (FBG) demodulator Download PDFInfo
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Abstract
The invention discloses a kind of fiber temperature signal automatic gain device and fiber optic temperature (FBG) demodulator, which includes sequentially connected laser, reference rings and signal processing module；Laser is used for fibre optical transmission laser signal；Reference rings are connect with laser, for receiving the reflected laser signals returned from optical fiber；Signal processing module is connect with reference rings, for determining corresponding first current amplitude of the Stokes signal in reflected laser signals and corresponding second current amplitude of Anti-Stokes signal, and the difference between the first current amplitude and the second current amplitude is calculated, corresponding photoelectric parameter is constantly adjusted according to difference until difference meets predetermined condition.Technical solution of the present invention eliminates the difference in Raman diffused light subsignal between Stokes signal and Anti-Stokes signal, accurate basic data is provided for accurate thermometric, it realizes Gain Automatic adjusting, makes different intelligent acess that can obtain optimal measurement parameter.
Description
Technical field
The present invention relates to optical fiber temperature measurement system technical fields, in particular to a kind of fiber temperature signal automatic gain
Device and fiber optic temperature (FBG) demodulator.
Background technique
In the existing optical fiber temperature measurement system based on Raman scattering effect, due to Stokes signal and anti-Stokes
Include thermally sensitive frequency content in signal, therefore, for optical fiber temperature measurement system, Stokes signal and it is anti-this
Lentor signal it is accurate whether it is closely related with the accurate journey of the temperature of calculating.
To in the demodulating process of the reflected laser signals of fiber reflection time, fiber optic materials is considered only and have declined to light
Subtract, the difference that the decaying of micro-bend introducing, the variation of injection light pulse power and thermometric instruments respond optical signal the problems such as
Caused by temperature information measurement error, in view of deviation between Stokes signal and Anti-Stokes signal is to temperature value
It is influenced caused by calculating.
Summary of the invention
In view of the above problems, the embodiment of the present invention be designed to provide a kind of fiber temperature signal automatic gain device and
Fiber optic temperature (FBG) demodulator, so as to solve the deficiencies in the prior art.
According to embodiment of the present invention, a kind of fiber temperature signal automatic gain device is provided, including is successively connected
Laser, reference rings and the signal processing module connect；
The laser is used for fibre optical transmission laser signal；
The reference rings are connect with the laser, for receiving the reflected laser signals returned from the optical fiber and by institute
It states reflected laser signals and is sent to the signal processing module；
The signal processing module is connect with the reference rings, for determining the Stokes in the reflected laser signals
Corresponding first current amplitude of signal and corresponding second current amplitude of Anti-Stokes signal, and calculate the first electric current width
Difference between value and second current amplitude constantly adjusts corresponding photoelectric parameter according to the difference until the difference
Meet predetermined condition.
It further include the signal modulation mould being connect with the laser in above-mentioned fiber temperature signal automatic gain device
Block, the signal modulation module include power control unit, wavelength control unit and lock-out pulse unit；
The power control unit is used to control the power of the laser signal, and the wavelength control unit is for controlling institute
The wavelength of laser signal is stated, the lock-out pulse unit is received and dispatched in a manner of lock-out pulse for controlling the laser signal, so that
The laser launches the laser signal that signal parameter meets preset condition.
Further include signal amplification module in above-mentioned fiber temperature signal automatic gain device:
The signal amplification module is connected between the reference rings and the signal processing module, is used for the reflection
Laser signal is sent to the signal processing module after amplifying processing.
In above-mentioned fiber temperature signal automatic gain device, the signal processing module is respectively by the Stokes
Signal and the Anti-Stokes signal carry out photoelectric conversion and obtain corresponding electric signal, by the corresponding electricity of the Stokes signal
Signal presumptive area amplitude as the first current amplitude, and by the corresponding electric signal of the Anti-Stokes signal described
The amplitude of presumptive area is as the second current amplitude.
In above-mentioned fiber temperature signal automatic gain device, the photoelectric parameter includes inclined in photoelectric conversion process
Set voltage；
The signal processing module adjusts the bias voltage until the first electric current obtained after adjustment according to the difference
Difference between amplitude and second current amplitude meets the predetermined condition.
In above-mentioned fiber temperature signal automatic gain device, the photoelectric parameter includes acquiring the Stokes letter
Number and the Anti-Stokes signal device temperature value；
The signal processing module adjusts the temperature value until the first electric current width obtained after adjustment according to the difference
Difference between value and second current amplitude meets the predetermined condition.
In above-mentioned fiber temperature signal automatic gain device, the signal processing module is also according to the reflection laser
Signal identification goes out the Stokes signal and the Anti-Stokes signal.
Further include Wavelength division multiplexing module in above-mentioned fiber temperature signal automatic gain device:
The Wavelength division multiplexing module is connected between the reference rings and the laser, and amplifies mould with the signal
Block connection；
The laser signal is passed sequentially through the Wavelength division multiplexing module with the laser and the reference rings emit to right
Answer optical fiber；
The reflected laser signals received are sent the Wavelength division multiplexing module by the reference rings；
The Wavelength division multiplexing module in the reflected laser signals received for identifying the Stokes letter
Number and the Anti-Stokes signal, and send the signal for the Stokes signal and the Anti-Stokes signal
Amplification module.
It further include the photoswitch being connect with the reference rings, institute in above-mentioned fiber temperature signal automatic gain device
State the optical fiber that photoswitch is connected with predetermined quantity；
The photoswitch is used to switch the connection status of the reference rings and optical fiber, the reference rings are sent described in
Laser signal emits to corresponding optical fiber.
In above-mentioned fiber temperature signal automatic gain device, the predetermined condition includes the difference less than preset
Amplitude threshold.
Another embodiment according to the present invention provides a kind of fiber optic temperature (FBG) demodulator, the fiber optic temperature (FBG) demodulator
It include above-mentioned fiber temperature signal automatic gain device.
The technical scheme provided by this disclosed embodiment may include it is following the utility model has the advantages that
A kind of fiber temperature signal automatic gain device and fiber optic temperature (FBG) demodulator in the present invention, are imitated based on Raman scattering
In the temp measuring system answered, the difference in Raman diffused light subsignal between Stokes signal and Anti-Stokes signal is eliminated,
Accurate measurement parameter is provided for accurate thermometric, realizes that Stokes signal and Anti-Stokes signal correspond in current limit signal and increase
The automatic adjustment of benefit makes different intelligent acess that can obtain optimal measurement parameter, improves the accurate of subsequent temperature values calculating
Degree.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, letter will be made to attached drawing needed in the embodiment below
It singly introduces, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as to the present invention
The restriction of protection scope for those of ordinary skill in the art without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 shows a kind of structural representation of fiber temperature signal automatic gain device of first embodiment of the invention offer
Figure.
Fig. 2 shows a kind of waveform diagrams for reflected laser signals that first embodiment of the invention provides.
Fig. 3 shows one kind the first current signal adjusted and the second current signal of first embodiment of the invention offer
Waveform diagram.
Fig. 4 shows a kind of structural representation of fiber temperature signal automatic gain device of second embodiment of the invention offer
Figure.
Fig. 5 shows a kind of structural representation of fiber temperature signal automatic gain device of third embodiment of the invention offer
Figure.
The structure that Fig. 6 shows another fiber temperature signal automatic gain device of third embodiment of the invention offer is shown
It is intended to.
Main element symbol description:
10- fiber temperature signal automatic gain device；100- laser；200- reference rings；300- signal processing module；
400- signal modulation module；410- power control unit；420- wavelength control unit；430- lock-out pulse unit；500- signal
Amplification module；600- Wavelength division multiplexing module；700- photoswitch.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Embodiment 1
Fig. 1 shows a kind of structural representation of fiber temperature signal automatic gain device of first embodiment of the invention offer
Figure.
The fiber temperature signal automatic gain device 10 includes laser 100, reference rings 200 and signal processing module 300.
The laser 100, the reference rings 200 and the signal processing module 300 are sequentially connected.
The laser 100 is used for fibre optical transmission laser signal.
Specifically, the laser 100 launches laser signal, which is incident to the optical fiber for needing to measure temperature
In.
The reference rings 200 are connect with the laser, for receiving the reflected laser signals returned from the optical fiber, and
The signal processing module 300 is sent by the reflected laser signals.
Specifically, when the laser signal is propagated in optical fiber, some laser signal is reflected in the optical fiber
Back, additionally, due to the microinhomogeneities in optical fiber there are refractive index, incident laser signal can occur in the optical fiber
Scattering.It further include being reflected back the optical signal scattered from the reflected laser signals being reflected back in optical fiber.
The reflected laser signals are transmitted in the receiving device in laser 100 by reference rings 200.
Since the scattering in optical fiber includes Rayleigh scattering, Brillouin scattering and Raman scattering.Therefore, it is reflected back from optical fiber
Reflected laser signals in include Rayleigh scattering signal, brillouin scattering signal and Raman scattering signal.
The reference rings 200 receive the reflected laser signals from optical fiber, which is sent into signal processing
Module 300 is handled.
The signal processing module 300 is connect with the reference rings 200, for determining this in the reflected laser signals
Corresponding first current amplitude of lentor signal and corresponding second current amplitude of Anti-Stokes signal, and calculate described first
Difference between current amplitude and second current amplitude constantly adjusts corresponding photoelectric parameter according to the difference until institute
It states difference and meets predetermined condition.
Further, the signal processing module 300 also identifies the Stokes in the reflected laser signals
Signal and the Anti-Stokes signal.
Specifically, it is illustrated in figure 2 the frequency spectrum obtained after the reflection signal that the reflected laser signals are converted to frequency domain
Curve is the corresponding frequency of Rayleigh scattering signal with the identical curve S1 of laser signal frequency that emits from the laser 100
Spectral curve, the both sides spectrum curve S2 neighbouring with the spectrum curve S1 of Rayleigh scattering signal are that the frequency spectrum of brillouin scattering signal is bent
Line, the frequency difference of the spectrum curve S1 of the spectrum curve S2 and Rayleigh scattering signal of brillouin scattering signal is generally 10-1~100cm
Magnitude.Spectrum curve S1 apart from Rayleigh scattering signal farther out a little spectrum curve be Raman scattering signal spectrum curve.
According to the spectral range of Rayleigh scattering signal, the spectral range of brillouin scattering signal and Raman scattering signal
After spectral range determines Raman scattering signal, the frequency of frequency range and Anti-Stokes signal also according to Stokes signal
Range determines the corresponding spectrum curve S31 of Stokes signal and the corresponding spectrum curve S32 of Anti-Stokes signal.
For example, Raman scattering signal is divided into Stokes signal and Anti-Stokes signal in frequency domain, wherein Si Tuo
The frequency of gram this signal are as follows:
vs=v0-Δv
Wherein, vsFor the frequency of Stokes signal, v0For the frequency of laser signal incident in optical fiber, Δ v is optical fiber sound
The vibration frequency of son, wherein Δ v=1.32 × 1013Hz。
The frequency of Anti-Stokes signal are as follows:
va=v0+Δv
Wherein, vaFor the frequency of Anti-Stokes signal.
According to the above-mentioned corresponding frequency of Stokes signal and Anti-Stokes signal in the Raman scattering signal
Determine stoke signal and Anti-Stokes signal.
After determining the stoke signal and Anti-Stokes signal, since Stokes signal and anti-Stokes are believed
It number is equal optical signal, for convenience of the subsequent analysis to optical signal, the signal processing module 300 can pass through photoelectric converter first
The optical signal is converted into electric signal.
For example, the signal processing module 300 is given the Stokes signal energy transmission by photoelectric conversion mode
Electronics makes its movement form the first current signal, so that its movement is formed the second electricity Anti-Stokes signal energy transmission electron
Flow signal.Two wavy curves as shown in Figure 3 are respectively the corresponding wavy curve of the first current signal and the second current signal
Corresponding wavy curve.
Further, in order to make the Stokes signal and the Anti-Stokes signal be in same time basis
On, it is convenient for subsequent analysis, the Stokes signal and the Anti-Stokes signal are synchronous sampling signal.
Due to including the frequency sensitive to fiber optic temperature in the Stokes signal and the Anti-Stokes signal
Rate ingredient and the frequency content insensitive to fiber optic temperature, therefore, the Stokes signal and the Anti-Stokes signal
It equally include the frequency content sensitive to fiber optic temperature and the frequency content insensitive to fiber optic temperature in corresponding current signal.
For example, as shown in figure 3, in the first current signal to the corresponding waveform of frequency content that fiber optic temperature is sensitive be P31, to optical fiber
The corresponding waveform of the frequency content of temperature-insensitive is Q31；The frequency content pair sensitive to fiber optic temperature in second current signal
The waveform answered is P32, is Q32 to the corresponding waveform of frequency content that fiber optic temperature is insensitive.
Wherein, in first current signal to the corresponding waveform Q31 of frequency content that fiber optic temperature is insensitive (first
The corresponding portion waveshape of another time interval Δ t2 in the waveform of current signal) with second current signal in optical fiber temperature
Spend the corresponding waveform Q32 of insensitive frequency content (in the waveform of the second current signal another t2 pairs of time interval Δ
The portion waveshape answered) between separate be not overlapped, separated degree is related with fiber optic temperature, and fiber optic temperature is higher, separate
Degree is bigger, and fiber optic temperature is lower, and degree of separation is smaller.
If the corresponding time interval of waveform P31 of the frequency content sensitive to fiber optic temperature is first in the first current signal
Time interval, the corresponding time interval of waveform P32 of the frequency content sensitive to fiber optic temperature is second in the second current signal
Time interval, since the Stokes signal and the Anti-Stokes signal are synchronous sampling signal, this first when
Between section and the second time interval be identical time interval, for example, Δ t1 is the identical time interval as in Fig. 3.
In the waveform of the first current signal and the second current signal, the corresponding wave regions of time interval Δ t1 are made
For presumptive area.In the waveform of the first current signal presumptive area, select the current amplitude of a point as the first electric current width
Value, or using the average value of the current amplitude of all the points in the presumptive area as the first current amplitude.Believe in the second electric current
In the waveform of number presumptive area, select the current amplitude of a point as the second current amplitude, or will be in the presumptive area
The average value of the current amplitude of all the points is as the second current amplitude.
Although to fiber optic temperature in the frequency content sensitive to fiber optic temperature and the second current signal in the first current signal
The sensitive corresponding time interval of frequency content is identical, due to the difference of Stokes signal and Anti-Stokes signal itself,
Cause to have differences between the first current amplitude and the second electric power amplitude, therefore, eliminates first current amplitude and the second electric current
Difference between amplitude is the necessary process for realizing accurate thermometric.
Further, the signal processing module 300 calculates the difference between the first current amplitude and the second current amplitude,
It, can be by adjusting the first current signal or the corresponding photoelectricity of the second current signal if the difference is not less than preset amplitude threshold
Parameter is finely adjusted the gain of entire fiber temperature signal automatic gain device 10, makes in first current signal to optical fiber
To fiber optic temperature sensitive frequency ingredient pair in the corresponding waveform of temperature sensitive frequency ingredient (i.e. waveform P31) and the second current signal
The waveform (i.e. waveform P32) answered overlaps, to eliminate the difference between Stokes signal and Anti-Stokes signal.
Specifically, as a kind of adjustment mode, the photoelectric parameter includes the bias voltage in photoelectric conversion process；
The signal processing module 300 adjusts photoelectric conversion in photoelectric conversion process according to the difference within a predetermined range
Device or the corresponding bias voltage of photoelectric conversion circuit, between the first current amplitude and the second current amplitude after being adjusted
Difference, rejudges whether the difference adjusted meets predetermined condition, and difference is still unsatisfactory for predetermined item after the adjustment
When part, the corresponding bias voltage of adjustment photoelectric converter is also continued, continues to carry out the first current signal and the second current signal
Adjustment repeats above-mentioned adjustment bias voltage and the step of whether difference meets predetermined condition is judged.It is worth noting that,
The restrictive condition repeated is that the adjustment of the bias voltage cannot exceed preset range, and the first electricity is finely tuned in the preset range
Amplitude or the second current amplitude are flowed, to reach on the basis of not changing the first current signal and the second current signal, as far as possible
So that the corresponding waveform of the first current signal waveform corresponding with the second current signal is overlapped.
However, when due to being adjusted to bias voltage, it is possible that leading to the first current signal the phenomenon that snowslide
And/or second current signal change.So being limited to predetermined model to the adjustment of offset voltage in above-mentioned adjustment mode
In enclosing, the setting of the preset range is not on the basis of occurring snowslide phenomenon.
Further, the photoelectric parameter includes the device for acquiring the Stokes signal and Anti-Stokes signal
The temperature value of part；
When the difference does not meet predetermined condition, the signal processing module 300 also believes the acquisition Stokes
Number and the temperature value of device of the Anti-Stokes signal be adjusted, for example, when difference is greater than preset amplitude threshold,
The temperature value that the device for acquiring the Stokes signal and the Anti-Stokes signal can be increased is less than pre- in difference
If amplitude threshold when, the temperature value for acquiring the device of the Stokes signal and the Anti-Stokes signal can be reduced,
After the adjustment, the difference between the first current amplitude and the second current amplitude after being adjusted, it is poor after the adjustment to rejudge
Whether value meets predetermined condition, when difference is still unsatisfactory for predetermined condition after the adjustment, also continue adjustment acquisition it is described this
The temperature value of the device of lentor signal and the Anti-Stokes signal, continues to the first current signal and the second current signal
It is adjusted, repeats above-mentioned set-up procedure, until the difference obtained after adjustment meets predetermined condition.
It is worth noting that, if first electricity cannot be made by way of adjusting the bias voltage in photoelectric conversion process
It, can also be within a predetermined range by adjusting light when difference between stream amplitude and second current amplitude meets predetermined condition
The mode of bias voltage during electricity turns makes difference between first current amplitude and second current amplitude and pre-
Fixed condition is as close as then the first current signal and the second current signal when determining closest to predetermined condition pass through
Adjust acquire the mode of the temperature value of device of the Stokes signal and Anti-Stokes signal to the first current signal and
Second current signal carries out continuing to debug, until the difference obtained after adjustment meets predetermined condition.
It is worth noting that, the predetermined condition can be equal for first current amplitude and the second current amplitude, or should
Difference between first current amplitude and the second current amplitude is less than preset amplitude threshold, most preferably, the preset width
Spending threshold value is 0.
After the difference meets predetermined condition, it is meant that in first current signal frequency sensitive to fiber optic temperature at
Overlap in point corresponding waveform and the second current signal to the corresponding waveform of frequency content that fiber optic temperature is sensitive, this
To sensitive to fiber optic temperature in the corresponding waveform of frequency content and the second current signal that fiber optic temperature is sensitive in one current signal
The corresponding waveform of frequency content be completely coincident after, first current signal and the second current signal are in presumptive area Δ t1
Current amplitude is equal, such as Num1 shown in 3；Or the frequency content pair sensitive to fiber optic temperature in first current signal
The corresponding waveform of frequency content that fiber optic temperature is sensitive is almost overlapped in the waveform and the second current signal answered, in other words, is led to
Cross in the first current signal in the corresponding waveform of frequency content and the second current signal that fiber optic temperature is sensitive to optical fiber temperature
It spends the corresponding waveform adjustment of sensitive frequency content and reaches maximum coincidence, eliminate Stokes signal and this anti-support
Difference between gram this signal.
Embodiment 2
Fig. 4 shows a kind of structural representation of fiber temperature signal automatic gain device of third embodiment of the invention offer
Figure.
The fiber temperature signal automatic gain device 10 include laser 100, reference rings 200, signal processing module 300,
Signal modulation module 400 and signal amplification module 500.
The signal modulation module 400, the laser 100, the reference rings 200, the signal amplification module 500 and
The signal processing module 300 is sequentially connected.
The signal modulation module 400 includes power control unit 410, wavelength control unit 420 and lock-out pulse unit
430。
The power control unit 410 is used to issue power control signal to control the laser that the laser 100 issues
The power of signal, the wavelength control unit 420 are used to issue wavelength control signal to control swashing for the sending of laser 100
The wavelength of optical signal, the lock-out pulse unit 430 for issue synchronized-pulse control signal control the laser 100 with
The laser signal that the mode of lock-out pulse issues, the laser 100 are believed according to the power control signal, the wavelength control
Number and the synchronized-pulse control signal launch the laser signal that signal parameter meets preset condition, such as can be by above-mentioned
Power control unit 410, wavelength control unit 420 and lock-out pulse unit 430 control laser 100 and continuously send out 1550nm
Laser signal.
It is worth noting that, in different application scenarios, due to the difference of the conditions such as temperature, environment in each scene,
Power control unit 410, wavelength control unit 420 or lock-out pulse unit 430 in the signal modulation module 400 is different
The content for the control signal that scene issues may be different.
It is illustrated by taking power control signal as an example below, wavelength control signal and synchronized-pulse control signal and power control
Signal processed is identical, does not illustrate herein.For example, in the first scene, if the sending of laser 100 is made to meet preset condition
Laser signal, the power control signal that power control unit 410 issues are control laser with power M1 transmitting laser signal.And
In the second scene, due to the variation such as temperature, environment, if laser 100 is made to issue the laser letter for meeting preset condition
Number, the power control signal that power control unit 410 issues is necessary for control laser and emits laser signal with power M2.
The reference rings 200 are used to receive the reflected laser signals returned from the optical fiber, and the reflection laser is believed
Number it is sent to signal amplification module 500.
Since the Raman scattering signal of the carrying temperature information in the reflected laser signals is very faint, the signal
Amplification module 500 also needs to be sent to the signal processing module 300 after the reflected laser signals to be amplified to processing.
The signal processing module 300 identifies Stokes signal and anti-Stokes in the reflected laser signals
Signal, and the Stokes signal and the Anti-Stokes signal are subjected to photoelectric conversion respectively and obtain corresponding electric signal,
Amplitude using the corresponding electric signal of the Stokes signal in presumptive area is held in the palm as the first current amplitude, and by anti-this
Gram corresponding electric signal of this signal the presumptive area amplitude as the second current amplitude.
The signal processing module 300 determines corresponding first electric current of Stokes signal in the reflected laser signals
Amplitude and corresponding second current amplitude of Anti-Stokes signal, and calculate first current amplitude and the second electric current width
Difference between value constantly adjusts corresponding photoelectric parameter according to the difference until the difference meets predetermined condition.
Embodiment 3
Fig. 5 shows a kind of structural representation of fiber temperature signal automatic gain device of third embodiment of the invention offer
Figure.
The described fiber temperature signal automatic gain device 10 includes laser 100, reference rings 200, signal processing module
300, signal modulation module 400, signal amplification module 500, Wavelength division multiplexing module 600 and photoswitch 700.
The signal modulation module 400 connects the laser 100, and the laser 100 connects the wavelength-division multiplex mould
Block 600, the Wavelength division multiplexing module 600 connect the reference rings 200, and the reference rings 200 connect the photoswitch 700, institute
State a plurality of optical fiber of the connection of photoswitch 700 to testing temperature, such as tetra- optical fiber of A, B, C, D in Fig. 5.
The Wavelength division multiplexing module 600 is also connected with the signal amplification module 500, and the signal amplification module 500 connects
The signal processing module 300.
The signal modulation module 400 includes power control unit 410, wavelength control unit 420 and lock-out pulse unit
430。
The power control unit 410 is for the power for controlling the laser signal, the wavelength control unit 420
For controlling the wavelength of the laser signal, the lock-out pulse unit 430 is for controlling the laser signal with lock-out pulse
Mode is received and dispatched, so that the laser 100 launches the laser signal that signal parameter meets preset condition.
The laser signal for meeting preset condition is sent Wavelength division multiplexing module 600, the wave by the laser 100
Divide Multiplexing module 600 by received laser signal transmission to reference rings 200, the reference rings 200 send the laser signal
To photoswitch 700, the photoswitch 700 is used to switch the connection status of the reference rings 200 and optical fiber, makes the reference rings
200 send the laser signal in the optical fiber of connection.
The photoswitch 700 can constantly switch a plurality of optical fiber of its connection and the connection of reference rings 200 by folding condition
State, so that the reference rings 200 send the laser signal to the wherein optical fiber in a plurality of optical fiber.
The laser signal transmits in the optical fiber, it may occur that reflection, the reflected laser signals being reflected back pass through described
Reference rings 200.
The reference rings 200 receive the reflected laser signals returned from the optical fiber, and the reflected laser signals are sent out
It is sent to Wavelength division multiplexing module 600.
The Wavelength division multiplexing module 600 is for identifying the Stokes in the reflected laser signals received
Signal and the Anti-Stokes signal, and the letter is sent by the Stokes signal and the Anti-Stokes signal
Number amplification module 500.
Specifically, identify that the mode of Stokes signal and Anti-Stokes signal can be with reality in reflected laser signals
The identification method applied in example 1 is identical.
The Stokes signal and the Anti-Stokes signal are amplified operation by the signal amplification module 500
After be sent to signal processing module 300.
The Stokes signal and the Anti-Stokes signal are carried out photoelectricity respectively by the signal processing module 300
Be converted to corresponding electric signal, using the corresponding electric signal of the Stokes signal presumptive area amplitude as the first electric current
Amplitude, and using the corresponding electric signal of the Anti-Stokes signal the presumptive area amplitude as the second current amplitude.
The signal processing module 300 determines corresponding first electric current of Stokes signal in the reflected laser signals
Amplitude and corresponding second current amplitude of Anti-Stokes signal, and calculate first current amplitude and the second electric current width
Difference between value constantly adjusts corresponding photoelectric parameter according to the difference until the difference meets predetermined condition.
Further, described as shown in fig. 6, the signal processing module 300 is also connected with the signal modulation module 400
Signal processing module 300 issues modulation instructions to the signal modulation module 400, so that the signal modulation module 400 controls
The laser 100 issues the laser signal that signal parameter meets preset condition.
The embodiment of the invention also provides a kind of fiber optic temperature (FBG) demodulator, the fiber optic temperature (FBG) demodulator includes above-mentioned light
Fine temperature signal automatic gain device 10.
In several embodiments provided herein, it should be understood that disclosed device and method can also pass through
Other modes are realized.The apparatus embodiments described above are merely exemplary, for example, flow chart and structure in attached drawing
Figure shows the system frame in the cards of the device of multiple embodiments according to the present invention, method and computer program product
Structure, function and operation.In this regard, each box in flowchart or block diagram can represent a module, section or code
A part, a part of the module, section or code includes one or more for implementing the specified logical function
Executable instruction.It should also be noted that function marked in the box can also be to be different from the implementation as replacement
The sequence marked in attached drawing occurs.For example, two continuous boxes can actually be basically executed in parallel, they are sometimes
It can execute in the opposite order, this depends on the function involved.It is also noted that in structure chart and/or flow chart
The combination of each box and the box in structure chart and/or flow chart, can function or movement as defined in executing it is dedicated
Hardware based system realize, or can realize using a combination of dedicated hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention can integrate one independence of formation together
Part, be also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
If the function is realized and when sold or used as an independent product in the form of software function module, can store one
In a computer-readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words to existing skill
The part of part or the technical solution that art contributes can be embodied in the form of software products, the computer software
Product is stored in a storage medium, including some instructions are used so that computer equipment (can be smart phone, a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.
Claims (10)
1. a kind of fiber temperature signal automatic gain device, which is characterized in that including sequentially connected laser, reference rings and letter
Number processing module；
The laser is used for fibre optical transmission laser signal；
The reference rings are connect with the laser, for receive from the optical fiber return reflected laser signals and will it is described instead
It penetrates laser signal and is sent to the signal processing module；
The signal processing module is connect with the reference rings, for determining the Stokes signal in the reflected laser signals
Corresponding first current amplitude and corresponding second current amplitude of Anti-Stokes signal, and calculate first current amplitude with
Difference between second current amplitude constantly adjusts corresponding photoelectric parameter according to the difference until the difference meets
Predetermined condition.
2. fiber temperature signal automatic gain device according to claim 1, which is characterized in that further include and the laser
The signal modulation module of device connection, the signal modulation module includes power control unit, wavelength control unit and lock-out pulse
Unit；
The power control unit is used to control the power of the laser signal, and the wavelength control unit is described sharp for controlling
The wavelength of optical signal, the lock-out pulse unit is received and dispatched in a manner of lock-out pulse for controlling the laser signal, so that described
Laser launches the laser signal that signal parameter meets preset condition.
3. fiber temperature signal automatic gain device according to claim 2, which is characterized in that further include signal amplification mould
Block:
The signal amplification module is connected between the reference rings and the signal processing module, is used for the reflection laser
Signal is sent to the signal processing module after amplifying processing.
4. fiber temperature signal automatic gain device according to claim 1, which is characterized in that the signal processing module
The Stokes signal and the Anti-Stokes signal are subjected to photoelectric conversion respectively and obtain corresponding electric signal, will it is described this
The corresponding electric signal of lentor signal presumptive area amplitude as the first current amplitude, and by the Anti-Stokes signal
Corresponding electric signal the presumptive area amplitude as the second current amplitude.
5. fiber temperature signal automatic gain device according to claim 4, which is characterized in that the photoelectric parameter includes
Bias voltage in photoelectric conversion process；
The signal processing module adjusts the bias voltage until the first current amplitude obtained after adjustment according to the difference
Difference between second current amplitude meets the predetermined condition.
6. fiber temperature signal automatic gain device according to claim 5, which is characterized in that the photoelectric parameter includes
Acquire the temperature value of the device of the Stokes signal and the Anti-Stokes signal；
The signal processing module temperature value adjusted according to the difference until after adjustment obtained the first current amplitude with
Difference between second current amplitude meets the predetermined condition.
7. fiber temperature signal automatic gain device according to claim 3, which is characterized in that further include wavelength-division multiplex mould
Block:
The Wavelength division multiplexing module is connected between the reference rings and the laser, and is connected with the signal amplification module
It connects；
The laser signal is passed sequentially through the Wavelength division multiplexing module with the laser and the reference rings emit to corresponding light
It is fine；
The reflected laser signals received are sent the Wavelength division multiplexing module by the reference rings；
The Wavelength division multiplexing module for identified in the reflected laser signals received the Stokes signal and
The Anti-Stokes signal, and send the signal for the Stokes signal and the Anti-Stokes signal and amplify
Module.
8. fiber temperature signal automatic gain device according to claim 1, which is characterized in that further include and the reference
The photoswitch of ring connection, the photoswitch are connected with the optical fiber of predetermined quantity；
The photoswitch is used to switch the connection status of the reference rings and optical fiber, the laser that the reference rings are sent
Signal emits to corresponding optical fiber.
9. fiber temperature signal automatic gain device according to claim 1, which is characterized in that the predetermined condition includes
The difference is less than preset amplitude threshold.
10. a kind of fiber optic temperature (FBG) demodulator, which is characterized in that the fiber optic temperature (FBG) demodulator includes as claim 1-9 is any
Fiber temperature signal automatic gain device described in.
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|---|---|---|---|---|
| GB2277147A (en) * | 1993-04-14 | 1994-10-19 | York Ltd | Optical fibre distributed sensing |
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| CN204881910U (en) * | 2015-09-14 | 2015-12-16 | 深圳市迅捷光通科技有限公司 | Distributed optical fiber raman temperature measurement system |
| CN108007483A (en) * | 2017-11-21 | 2018-05-08 | 北京航天控制仪器研究所 | A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2277147A (en) * | 1993-04-14 | 1994-10-19 | York Ltd | Optical fibre distributed sensing |
| CN204612831U (en) * | 2015-04-15 | 2015-09-02 | 中国电子科技集团公司第八研究所 | Distributed optical fiber temperature sensor |
| CN105021310A (en) * | 2015-07-28 | 2015-11-04 | 上海交通大学 | High precision fiber grating temperature sensing system |
| CN204881910U (en) * | 2015-09-14 | 2015-12-16 | 深圳市迅捷光通科技有限公司 | Distributed optical fiber raman temperature measurement system |
| CN108007483A (en) * | 2017-11-21 | 2018-05-08 | 北京航天控制仪器研究所 | A kind of fiber Bragg grating (FBG) demodulator and control method with automatic gain control function |
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