CN110196118A - A kind of dynamic temperature calibration self-calibrating device and method - Google Patents
A kind of dynamic temperature calibration self-calibrating device and method Download PDFInfo
- Publication number
- CN110196118A CN110196118A CN201910532481.3A CN201910532481A CN110196118A CN 110196118 A CN110196118 A CN 110196118A CN 201910532481 A CN201910532481 A CN 201910532481A CN 110196118 A CN110196118 A CN 110196118A
- Authority
- CN
- China
- Prior art keywords
- sensor fibre
- heating module
- temperature
- input terminal
- stokes light
- 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
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 113
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 72
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 29
- 229910052782 aluminium Inorganic materials 0.000 claims description 29
- 239000004411 aluminium Substances 0.000 claims description 29
- 239000013307 optical fiber Substances 0.000 claims description 14
- 101150099190 ARR3 gene Proteins 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- 101100324465 Caenorhabditis elegans arr-1 gene Proteins 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000002269 spontaneous effect Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000013481 data capture Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
- 230000006872 improvement Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000009510 drug design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A kind of dynamic temperature calibration self-calibrating device and method, including pulse laser, the output end of pulse laser and the input terminal of WDM connect；Two output ends of WDM are connect with the first APD with the input terminal of the 2nd APD respectively；The output end of first APD is connect with the input terminal of the first LNA；The output end of 2nd APD is connect with the input terminal of the 2nd LNA；The output end of first LNA and the 2nd LNA passes through data collecting card and the input terminal of computer connects；The common end of WDM is connected by the sensor fibre wound on dynamic scaling modular device with the input terminal of the first sensor fibre, and the output end of the first sensor fibre is connected with multimode fibre reflecting mirror.The present invention improves the precision of Temperature Scaling, and the line fitting method provided subsequent temperature demodulation provides guarantee, additionally it is possible to effectively avoid the problem that the power swing of pulse laser in distributed fiber Raman temp measuring system, Switching Power Supply power swing.
Description
Technical field
The present invention relates to mine goaf coal spontaneous combustions to monitor the new device in distributed fiber Raman temp measuring system on-line,
Specifically a kind of dynamic temperature calibration self-calibrating device and method.
Background technique
Using electric signal as traditional thermometric mode of working foundation certain special industry environment are for example inflammable and explosive, high voltage,
Seem helpless under the environment such as high current, the interference of forceful electric power flow field.Using light wave as carrier, optical fiber is medium, and perception and transmission are outer
The New Sensing Technology of boundary's measured signal --- optical fiber sensing technology comes into being therewith.Distributed fiberoptic sensor is nearly ten
A kind of novel sensor rapidly developed for many years, since it not only has non-conductive, small in size, the anti-electricity of fibre optical sensor
The advantages that magnetic disturbance is strong, and be able to achieve and multimetering is made to one-dimensional continuous space, thus can be to many large scale equipments or object
(such as generating set, intelligent building) carries out real-time multiple spot monitoring.
In distributed fiber Raman temp measuring system, currently used temperature demodulation method is to utilize Stokes back scattering
Light is as reference channel, using anti-Stokes rear orientation light as signal path, then utilizes both rear orientation lights
Light intensity ratio demodulate the temperature information along optical fiber.However practice have shown that, existing temperature demodulation method is due to itself principle
Limited, there are the following problems: first, temperature variation is very small to the knots modification of Raman ratio, from laser starting running to
In the case where long-term work, the power of laser is necessarily fluctuated, if will lead to two phases using previous calibration mode
The very big corresponding Raman ratio of temperature of difference is the same, this all has a great impact to the demodulation precision of temperature, especially in length
Under the premise of thermometric.Second, under the premise of being solved the above problems using dynamic scaling device, the fluctuation of other devices
It exerts a certain influence to the stability of system, to affect Raman ratio, causes thermometric drift big.
Based on this, influenced by Raman temperature measurer volume size, it is necessary to which a kind of dynamic scaling mould of suitable volumes is provided
Block assembly, come avoid the power swing of pulse laser in distributed fiber Raman temp measuring system, Switching Power Supply power swing with
And external environment fluctuation causes the thermometric of system to drift about big problem.
Summary of the invention
The power swing of pulse laser, Switching Power Supply power swing in distributed fiber Raman temp measuring system in order to prevent
And external environment fluctuation causes the thermometric of system to drift about big problem, it is an object of the invention to propose a kind of dynamic temperature
Calibrate self-calibrating device and method.
To achieve the above object, the present invention adopts the following technical scheme that realization:
A kind of dynamic temperature calibration self-calibrating device, including pulse laser, WDM, the 2nd APD, the 2nd APD, first
LNA, the 2nd LNA, data collecting card, computer, the first sensor fibre and dynamic scaling modular device；
The output end of pulse laser and the input terminal of WDM connect；Two output ends of WDM respectively with the first APD and second
The input terminal of APD connects；The output end of first APD is connect with the input terminal of the first LNA；The output end and the 2nd LNA of 2nd APD
Input terminal connection；The output end of first LNA and the 2nd LNA is connect with the input terminal of data collecting card；Data collecting card
The connection of the input terminal of output end and computer；
The input terminal of the sensor fibre wound on the common end of WDM and dynamic scaling modular device is connected, dynamic scaling mould
The output end of the sensor fibre wound on block assembly is connected with the input terminal of the first sensor fibre, the output end of the first sensor fibre
It is connected with multimode fibre reflecting mirror.
A further improvement of the present invention lies in that dynamic scaling modular device includes identical first heating module of structure and second
Heating module, the first heating module include the first cylindrical aluminium block, and the second heating module includes and the second cylindrical aluminium block first
The side wall of cylindrical aluminium block offers first annular groove, for winding sensor fibre；The side wall of second cylindrical aluminium block opens up
There is second annular groove, for winding sensor fibre；The sensor fibre wound on the common end of WDM and the first heating module it is defeated
Enter end to be connected, the sensor fibre wound on the output end of the sensor fibre wound on the first heating module and the second heating module
Input terminal is connected, and the output end of the sensor fibre wound on the second heating module is connected with the input terminal of the first sensor fibre, the
The output end of one sensor fibre is connected with multimode fibre reflecting mirror.
A further improvement of the present invention lies in that the top surface of the first cylindrical aluminium block offers the first groove, the first groove is set
It is equipped with the first PTC heat block；The top surface of second cylindrical aluminium block offers the second groove, and the second groove is provided with the 2nd PTC and adds
Heat block.
A further improvement of the present invention lies in that the top surface of the first cylindrical aluminium block is also provided with third groove；Third groove
Inside it is provided with the first thermocouple；The top surface of second cylindrical aluminium block is also provided with the 4th groove；Second is provided in 4th groove
Thermocouple.
A further improvement of the present invention lies in that being equipped with the first temperature controller on the first heating module；On second heating module
Second temperature controller is installed.
A kind of dynamic temperature calibration method for self-calibrating based on above-mentioned apparatus, comprising the following steps:
1) it obtains backwards to Stokes light and anti-Stokes light；
2) the Stokes light of backscattering is incident on data collecting card through WDM, the first APD, the first LNA, data collecting card
Analog-to-digital conversion is carried out to Stokes light；
The anti-Stokes light of backscattering is incident on data collecting card, data acquisition through WDM, the 2nd APD, the 2nd LNA
Card carries out analog-to-digital conversion to anti-Stokes light；
3) electric signal after analog-to-digital conversion is acquired by final data capture card, is then transferred to computer, computer
It is handled using temperature demodulation algorithm, obtains any one meter on optical fiber of temperature value T.
A further improvement of the present invention lies in that obtaining in step 1) backwards to the specific of Stokes light and anti-Stokes light
Process is as follows:
The temperature value of first temperature controller is set as T1, the temperature value of the second temperature controller is set as T2, then data acquire
Block to pulse laser and issue periodic signal, receives the pulse with some cycles that the pulse laser of periodic signal issues
Light, laser pulse pass through the biography that WDM is incident on the sensor fibre wound on the first heating module and winds on the second heating module
Enter the first sensor fibre after photosensitive fibre；Spontaneous Raman scattering occurs when propagating in the first sensor fibre for laser pulse, and first
In sensor fibre all there is the Stokes light and anti-Stokes light scattered to all directions in any position.
A further improvement of the present invention lies in that being handled using temperature demodulation algorithm, detailed process is as follows:
The quantized value of the temperature of certain point and the light intensity of the point anti-Stokes light and Stokes light on sensor fibre
Ratio is in certain linear relationship, it may be assumed that
T=k*Ratio+b (1)
The fiber lengths wound on first heating module and the second heating module are s meters, will the first heating module at this time
The anti-Stokes light of s point on the sensor fibre wound on the sensor fibre of upper winding and the second heating module and
The quantized value Ratio of the light intensity of Stokes light is logged in respectively in two arrays of arr1 [s] and arr2 [s] by computer；It will
The value of acquisition, which substitutes into formula (1), to be had:
Wherein, T1For the fixed temperature value of the first temperature controller setting, T2For the second temperature controller setting fixed temperature value, by
Formula (4) and formula (5) obtain slope k and biasing b:
The length of first sensor fibre is L meters, by the light intensity of the anti-Stokes light of L at this time point and Stokes light
Quantized value Ratio is logged in array arr3 [L] by computer, the fitting come out according to the value performance matching in arr3 [L]
The slope k 1 and b1 of straight line are respectively:
Wherein, coefficientFor a constant, coefficientFor a constant, it is
NumberFor a constant,For a constant, arr_x [i]=i, 0=< i=1,
2,3, ,≤L；
The data of fitting a straight line are obtained by formula (6) and formula (7), data are logged into arr_fitting [L]:
Arr_fitting [i]=k1*arr3 [i]+b1 (8)
Wherein, i:0=< i=1,2,3, ,≤L；The anti-Stokes that arr3 [i] is i-th point on the first sensor fibre
The quantized value Ratio of the light intensity of light and Stokes light；
By formula (8) it is found that the light intensity by i-th point on compensated whole first sensor fibre of fitting a straight line quantifies ratio
Value Ratio_New [i] are as follows:
Finally obtain i-th point on whole first sensor fibre of temperature value T [i] are as follows:
Wherein, T1For the fixed temperature value of the first temperature controller setting, T2For the fixed temperature value of the second temperature controller setting；The
The sensor fibre length wound on one heating module and the second heating module is s meters；Arr1 [i] and arr2 [i] are the respectively
The quantized value Ratio of the light intensity of i-th point of anti-Stokes light and Stokes light on the sensor fibre wound on one heating module
With the quantized value of the light intensity of i-th point on the sensor fibre that is wound on the second heating module of anti-Stokes light and Stokes light
Ratio；Wherein, 0=< i=1,2,3, ,≤s；Ratio_New [i] is by compensated whole first sensing of fitting a straight line
I-th point of light intensity quantifies ratio on optical fiber.
Compared with existing distributed optical fiber sensing system, the invention has the following beneficial effects: for itself, dynamic is fixed
The small in size of modular device is marked, it is cheap；For complete equipment effect, dynamic scaling modular device is avoided to be swashed by pulse
Power swing, the external environment variation and the problem of Switching Power Supply power swing in long-term use of light device.Dynamic temperature calibration
The performances such as device is small in size with its, precision is high, homogeneous heating, stabilization, so being easily mounted on dynamic temperature calibration of the invention
In self-calibrating device, and the precision of Temperature Scaling is improved, the line fitting method that subsequent temperature demodulation provides is provided
It ensures, additionally it is possible to effectively avoid the power swing of pulse laser in distributed fiber Raman temp measuring system, Switching Power Supply function
Rate fluctuation and external environment fluctuation cause the thermometric of system to drift about big problem.
Further, the optical fiber that certain length is wound on the cylindrical aluminium block set utilizes constant temperature PTC heating module
It is heated, and its temperature is controlled with thermocouple and intelligent temperature controller, dynamic temperature robot scaling equipment have its is small in size,
The advantages that precision height, homogeneous heating, stabilization.
The present invention dynamically demodulates the Raman ratio recorded every time in real time by using dynamic temperature demodulating algorithm, will
Raman ratio curve is laid flat, and reduces the increase with distance, the attenuated optical signal that pulse laser issues is to solution temperature regulating
It influences.The present invention has rational design, efficiently solve in existing distributed fiber Raman temp measuring system by pulse laser in length
Phase is using middle power swing, external environment variation and Switching Power Supply power swing is low to temperature demodulation precision, drift asking greatly
Inscribe and reduce the increase with distance, influence of the attenuated optical signal that pulse laser issues to solution temperature regulating.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the first heating module of dynamic temperature robot scaling equipment provided by the invention.
Fig. 2 is that the dynamic temperature of distributed fiber Raman temp measuring system provided by the invention calibrates the structure of self-calibrating device
Schematic diagram.
Fig. 3 is the curve synoptic diagram of 25 degree to 100 degree Raman ratio and temperature of the present invention before using dynamic scaling.
Fig. 4 is the present invention after using dynamic scaling but does not do the light intensity quantized value ratio of straight line fitting and the curve of distance
Schematic diagram.
Fig. 5, which is the present invention, using dynamic scaling and is finishing the song of the light intensity quantized value ratio after straight line fitting and distance
Line schematic diagram.
Wherein, 1 is pulse laser；2 be WDM；3 be the first heating module；4 be the second heating module；5 be the first temperature control
Device；6 be the second temperature controller；7 be the first APD；8 be the 2nd APD；9 be the first LNA；10 be the 2nd LNA；11 be capture card；12 are
Computer；13 be the first sensor fibre, and 14 be first annular groove, and 15 be the first groove, and 16 be the first wire guide, and 17 be second
Groove, 18 be the second wire guide.
Specific embodiment
Specific embodiments of the present invention are described in detail with reference to the accompanying drawing.
Referring to fig. 2, dynamic temperature provided by the invention calibrates self-calibrating device, including pulse laser 1, WDM 2, second
APD 7, the 2nd APD 8, the first LNA 9, the 2nd LNA 10, data collecting card 11, computer 12, the first sensor fibre 13 and
The dynamic scaling modular device of suitable volumes, wherein referring to Fig. 1, the dynamic scaling modular device of suitable volumes includes structure phase
With the first heating module 3 and the second heating module 4, the first heating module 3 includes the first cylindrical aluminium block, the second heating module 4
Including with the second cylindrical aluminium block, referring to Fig. 1, the first cylindrical aluminium block is that a diameter is 62mm, is highly the cylinder of 19mm
Shape aluminium block, cuts out high 10mm on the outer wall of cylindrical aluminium block (apart from bottom surface 1mm, top surface 8mm), and thick 1mm's is first annular
Groove 14 forms the sensor fibre that an embedded region is used to wind certain length, to prevent optical fiber from falling off；In cylindrical aluminium block
Top surface cut out first groove of 31mm*31mm*7mm rectangular-shape 15 and the first wire guide 16 that two bore dias are 5mm,
The first groove of rectangular-shape 15 is used to place the first PTC heat block；A 40mm*4mm* is cut out in the top surface of cylindrical aluminium block again
The second wire guide 18 that the second groove of 7mm rectangular-shape 17 and a bore dia are 5mm, the second groove of rectangular-shape are used to place
First thermocouple.Second cylindrical aluminium block is that a diameter is 62mm, is highly the cylindrical aluminium block of 19mm, in the outer wall of cylinder
Upper that high 10mm is cut out (apart from bottom surface 1mm, top surface 8mm), the second annular groove of thick 1mm forms an embedded region and is used to
The sensor fibre of certain length is wound, to prevent optical fiber from falling off；A 31mm*31mm*7mm is cut out in the top surface of cylindrical aluminium block
The wire guide that rectangular-shape third groove and two bore dias are 5mm, for placing the 2nd PTC heat block；Again in cylindrical aluminium
The wire guide that the 4th groove of 40mm*4mm*7mm rectangular-shape and a bore dia are 5mm, cuboid are cut out at the top of block
The 4th groove of shape is used to place the second thermocouple.
After having the dynamic scaling modular device of above-mentioned suitable volumes, distributed fiber Raman temp measuring system, i.e. structure are built
Build dynamic temperature calibration self-calibrating device.
Referring to fig. 2, the dynamic temperature of the invention based on distributed fiber Raman temp measuring system calibrates self-calibrating device packet
Include (1550nm) pulse laser 1, (two heating modules are respectively the first heating module 3 and to 2, two heating modules of WDM
Two heating modules 4, two PTC heating modules, two thermocouples, the optical fiber for winding certain multimode of the same race), two temperature controllers, two
A APD, two LNA, computer, multimode sensor fibre and multimode fibre reflecting mirror.
Specifically, the output end of pulse laser 1 and the input terminal of WDM2 connect；Two output ends of WDM2 are respectively with first
APD7 is connect with the input terminal of the 2nd APD8；The output end of first APD7 is connect with the input terminal of the first LNA9；2nd APD8's
Output end is connect with the input terminal of the 2nd LNA10；The output end of first LNA9 and the 2nd LNA10 is defeated with data collecting card 11
Enter end connection；The output end of data collecting card 11 is connect with the input terminal of computer 12；
The input terminal of the sensor fibre wound on the common end of WDM2 and the first heating module 3 is connect, the first heating module 3
The input terminal of the sensor fibre wound on the output end of the sensor fibre of upper winding and the second heating module 4 is connected, the second heating
The output end of sensor fibre is connected with the input terminal of the first sensor fibre of multimode 13 in module 4.The first sensor fibre of multimode 13
Output end is connected with multimode fibre reflecting mirror；The first thermocouple on first heating module 3 is connect with the first temperature controller 5；Second
The second thermocouple on heating module 4 is connect with the second temperature controller 6.
Temperature Scaling method for self-calibrating based on above-mentioned apparatus of the invention, comprising the following steps:
1) the dynamic scaling modular device of suitable volumes as shown in Figure 1 is made；
2) the dynamic temperature calibration self-calibrating device as shown in Figure 2 based on optical fiber Raman thermometry system is built
3) data value backwards to Stokes light intensity and anti-Stokes light intensity is obtained.
Before opening distributed fiber Raman temperature measurer, the temperature value of the first temperature controller 5 is set as T1, by the second temperature
The temperature value of control device is set as T2, then start Raman temperature measurer, data collecting card 11 issues period letter to pulse laser 1
Number, the pulsed light with some cycles that the pulse laser 1 of periodic signal issues is received, laser pulse enters by WDM 2
It is mapped to after the sensor fibre wound on the first heating module 3 and the sensor fibre wound on the second heating module 4 and enters multimode the
One sensor fibre 13.When propagating in the first sensor fibre of multimode 13 spontaneous Raman scattering occurs for laser pulse.This when is more
In the first sensor fibre of mould 13 all there is this Stokes light and anti-Stokes light that scatter to all directions, back in any position
Useful optical signal is just needed to the Stokes light and anti-Stokes light of scattering.
The Stokes light of backscattering is incident on data collecting card 11 through WDM 2, the first APD 7, the first LNA 9, data
Capture card 11 carries out analog-to-digital conversion to Stokes light；
The anti-Stokes light of backscattering is incident on data collecting card through WDM 2, the 2nd APD 8, the 2nd LNA 10
11, data collecting card 11 carries out analog-to-digital conversion to anti-Stokes light；
Finally (cumulative mean number is set as 60000 or more) data collecting card 11 by the electric signal after analog-to-digital conversion into
Row acquisition is then transferred to the storage and processing of computer 12.Computer 12 is handled, and detailed process is as follows:
According to abundant experimental results show on sensor fibre the temperature of certain point and the point anti-Stokes light and
The quantized value Ratio of the light intensity of Stokes light is in certain linear relationship, it may be assumed that
T=k*Ratio+b (1)
The fiber lengths wound on first heating module 3 and the second heating module 4 are s meters, will the first heated mould at this time
The anti-Stokes light of the s point on sensor fibre wound on the sensor fibre and the second heating module 4 wound on block 3 and
The quantized value Ratio of the light intensity of Stokes light is logged in two arrays of arr1 [s] and arr2 [s] respectively by computer 12；
The value of acquisition, which is substituted into formula (1), to be had:
Wherein, T1For the fixed temperature value of the first temperature controller 5 setting, T2For the second temperature controller 6 setting fixed temperature value,
Slope k and biasing b are obtained by formula (4) and formula (5):
The length of first sensor fibre 13 is L meters, by the light intensity of the anti-Stokes light of L at this time point and Stokes light
Quantized value Ratio be logged in array arr3 [L] by computer 12, come out according to the value performance matching in arr3 [L]
The slope k 1 and b1 of fitting a straight line are respectively:
Wherein, coefficientFor a constant, coefficientFor a constant, it is
NumberFor a constant,For a constant, arr_x [i]=i, 0=< i=1,
2,3, ,≤L；
The data of fitting a straight line are obtained by formula (6) and formula (7), data are logged into arr_fitting [L]:
Arr_fitting [i]=k1*arr3 [i]+b1 (8)
Wherein, i:0=< i=1,2,3, ,≤L；The anti-Stokes that arr3 [i] is i-th point on the first sensor fibre
The quantized value Ratio of the light intensity of light and Stokes light；
By formula (8) it is found that the light intensity by i-th point on compensated whole first sensor fibre 13 of fitting a straight line quantifies
Ratio R atio_New [i] are as follows:
Finally obtain i-th point on whole first sensor fibre 13 of temperature value T [i] are as follows:
Wherein, T1For the fixed temperature value of the first temperature controller 5 setting, T2For the fixed temperature value of the second temperature controller 6 setting；
The sensor fibre length wound on first heating module and the second heating module is s meters；Arr1 [i] and arr2 [i] is respectively
The quantized value of the light intensity of i-th point of anti-Stokes light and Stokes light on the sensor fibre wound on first heating module
The amount of the light intensity of i-th point of anti-Stokes light and Stokes light on the sensor fibre wound on Ratio and the second heating module
Change value Ratio；Wherein, 0=< i=1,2,3, ,≤s；Ratio_New [i] is to pass through fitting a straight line compensated whole first
I-th point of light intensity quantifies ratio on sensor fibre 13, referring to fig. 4 and Fig. 5.
When it is implemented, the wavelength of the pulse laser is 1550nm, pulsewidth 20ns, repetition rate 10KHz；Institute
The operation wavelength for stating WDM is 1550nm/1450nm/1663nm；The bandwidth of the APD is 100MHz, spectral response range 900
~1700nm；The bandwidth of the LNA is 100MHz；The data collecting card is USB interface, port number 4, sample rate are
100M/s, T1It is 40 DEG C, T2It is 60 DEG C；The multimode sensor fibre is common multimode fibre；The computer is notebook electricity
Brain；The PTC heating module is the common PTC heating sheet of special requirement, and the temperature controller is ordinary passive switching regulator temperature controller.
The data wherein acquired are all real value, including arr1 [s], arr2 [s], arr3 [L], arr_fitting [L], k, b.According to
Acquire changing often for a data.
Compared with existing distributed optical fiber sensing system, the invention proposes a kind of dynamic scaling module of suitable volumes dresses
It sets and is had the advantages that with dynamic temperature demodulating algorithm
First, for itself, dynamic scaling modular device it is small in size, it is ingenious in design, it is cheap；From complete equipment
For effect, dynamic scaling modular device avoid by pulse laser in long-term use power swing, external environment variation
And the problem of Switching Power Supply power swing.
Second, dynamic temperature demodulating algorithm, dynamically demodulates the Raman ratio recorded every time in real time, Raman ratio is bent
Line is laid flat, and reduces the increase with distance, influence of the attenuated optical signal that pulse laser issues to solution temperature regulating, referring to figure
3。
The present invention has rational design, efficiently solves being existed in existing distributed fiber Raman temp measuring system by pulse laser
Power swing, external environment change in long-time service and Switching Power Supply power swing is low to temperature demodulation precision, drifts about greatly
Problem and increase with distance is reduced, influence of the attenuated optical signal that pulse laser issues to solution temperature regulating.
The optical fiber that certain length is wound on the cylindrical aluminium block set heats it using constant temperature PTC heating module,
And its temperature is controlled with thermocouple and intelligent temperature controller, novel dynamic temperature robot scaling equipment is small in size with its, precision is high,
The performances such as homogeneous heating, stabilization are easily mounted in dynamic temperature calibration self-calibrating device of the invention, improve Temperature Scaling
Precision, to subsequent temperature demodulation provide line fitting method provide guarantee.Distributed fiber Raman can effectively be avoided
The power swing of pulse laser, Switching Power Supply power swing and external environment fluctuation lead to the thermometric of system in temp measuring system
It drifts about big problem.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although ginseng
It is described in detail according to the embodiment of the present invention, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered of the invention
In claims.
Claims (8)
1. a kind of dynamic temperature calibrates self-calibrating device, which is characterized in that including pulse laser (1), WDM (2), the 2nd APD
(7), the 2nd APD (8), the first LNA (9), the 2nd LNA (10), data collecting card (11), computer (12), the first sensor fibre
(13) and dynamic scaling modular device；
The output end of pulse laser (1) is connect with the input terminal of WDM (2)；(2) two output ends of WDM respectively with the first APD
(7) it is connect with the input terminal of the 2nd APD (8)；The output end of first APD (7) is connect with the input terminal of the first LNA (9)；Second
The output end of APD (8) is connect with the input terminal of the 2nd LNA (10)；The output end of first LNA (9) and the 2nd LNA (10) with number
It is connected according to the input terminal of capture card (11)；The output end of data collecting card (11) is connect with the input terminal of computer (12)；
The input terminal of the sensor fibre wound on the common end of WDM (2) and dynamic scaling modular device is connected, dynamic scaling module
The output end of the sensor fibre wound on device is connected with the input terminal of the first sensor fibre (13), the first sensor fibre (13)
Output end is connected with multimode fibre reflecting mirror.
2. a kind of dynamic temperature according to claim 1 calibrates self-calibrating device, which is characterized in that dynamic scaling module dress
It sets including identical first heating module (3) of structure and the second heating module (4), the first heating module (3) includes first cylindrical
Aluminium block, the second heating module (4) includes and the second cylindrical aluminium block, the side wall of the first cylindrical aluminium block offer first annular recessed
Slot, for winding sensor fibre；The side wall of second cylindrical aluminium block offers second annular groove, for winding sensor fibre；
The input terminal of the sensor fibre wound on the common end of WDM (2) and the first heating module (3) is connected, on the first heating module (3)
The input terminal of the sensor fibre wound on the output end of the sensor fibre of winding and the second heating module (4) is connected, the second heating
The output end of the sensor fibre wound in module (4) is connected with the input terminal of the first sensor fibre (13), the first sensor fibre
(13) output end is connected with multimode fibre reflecting mirror.
3. a kind of dynamic temperature according to claim 2 calibrates self-calibrating device, which is characterized in that the first cylindrical aluminium block
Top surface offer the first groove, the first groove is provided with the first PTC heat block；The top surface of second cylindrical aluminium block offers the
Two grooves, the second groove are provided with the 2nd PTC heat block.
4. a kind of dynamic temperature according to claim 2 calibrates self-calibrating device, which is characterized in that the first cylindrical aluminium block
Top surface be also provided with third groove；The first thermocouple is provided in third groove；The top surface of second cylindrical aluminium block also opens up
There is the 4th groove；The second thermocouple is provided in 4th groove.
5. a kind of dynamic temperature according to claim 2 calibrates self-calibrating device, which is characterized in that the first heating module
(3) the first temperature controller (5) are installed on；Second temperature controller (6) are installed on the second heating module (4).
6. a kind of dynamic temperature based on device as claimed in claim 2 calibrates method for self-calibrating, which is characterized in that including following
Step:
1) it obtains backwards to Stokes light and anti-Stokes light；
2) the Stokes light of backscattering is incident on data collecting card (11) through WDM (2), the first APD (7), the first LNA (9), number
Analog-to-digital conversion is carried out to Stokes light according to capture card (11)；
The anti-Stokes light of backscattering is incident on data collecting card through WDM (2), the 2nd APD (8), the 2nd LNA (10)
(11), data collecting card (11) carries out analog-to-digital conversion to anti-Stokes light；
3) electric signal after analog-to-digital conversion is acquired by final data capture card (11), is then transferred to computer (12), meter
Calculation machine (12) is handled using temperature demodulation algorithm, obtains any one meter on optical fiber of temperature value T.
7. a kind of dynamic temperature according to claim 6 calibrates method for self-calibrating, which is characterized in that obtain back in step 1)
To Stokes light and anti-Stokes light, detailed process is as follows:
The temperature value of first temperature controller (5) is set as T1, the temperature value of the second temperature controller is set as T2, then data acquire
Block (11) and issue periodic signal to pulse laser (1), it is certain to receive having for pulse laser (1) sending of periodic signal
The pulsed light in period, laser pulse are incident on the sensor fibre wound on the first heating module (3) and second by WDM (2) and add
Enter the first sensor fibre (13) after the sensor fibre wound in thermal modules (4)；Laser pulse is in the first sensor fibre (13)
Spontaneous Raman scattering occurs when propagation, any position all has the Stokes scattered to all directions in the first sensor fibre (13)
Light and anti-Stokes light.
8. a kind of dynamic temperature according to claim 6 calibrates method for self-calibrating, which is characterized in that calculated using temperature demodulation
Method is handled, and detailed process is as follows:
The temperature of certain point and the quantized value Ratio of the light intensity of the point anti-Stokes light and Stokes light are on sensor fibre
Certain linear relationship, it may be assumed that
T=k*Ratio+b (1)
The fiber lengths wound on first heating module (3) and the second heating module (4) are s meters, will the first heated mould at this time
The anti-Stokes of the s point on sensor fibre wound on the sensor fibre and the second heating module (4) wound on block (3)
The quantized value Ratio of the light intensity of light and Stokes light is logged in arr1 [s] and arr2 [s] two by computer (12) respectively
In array；The value of acquisition, which is substituted into formula (1), to be had:
Wherein, T1For the fixed temperature value of the first temperature controller (5) setting, T2For the second temperature controller (6) setting fixed temperature value,
Slope k and biasing b are obtained by formula (4) and formula (5):
The length of first sensor fibre (13) is L meters, by the light intensity of the anti-Stokes light of L at this time point and Stokes light
Quantized value Ratio is logged in array arr3 [L] by computer (12), is come out according to the value performance matching in arr3 [L]
The slope k 1 and b1 of fitting a straight line are respectively:
Wherein, coefficientFor a constant, coefficientFor a constant, coefficientFor a constant,For a constant, arr_x [i]=i, 0=< i=1,
2,3,, <=L；
The data of fitting a straight line are obtained by formula (6) and formula (7), data are logged into art_fitting [L]:
Arr_fitting [i]=k1*arr3 [i]+b1 (8)
Wherein, i:0=< i=1,2,3,, <=L；The anti-Stokes light that arr3 [i] is i-th point on the first sensor fibre
With the quantized value Ratio of the light intensity of Stokes light；
By formula (8) it is found that quantifying ratio by compensated whole upper i-th point of the light intensity of first sensor fibre (13) of fitting a straight line
Value Ratio_New [i] are as follows:
Finally obtain the temperature value T [i] of upper i-th point of whole first sensor fibre (13) are as follows:
Wherein, T1For the fixed temperature value of the first temperature controller (5) setting, T2For the fixed temperature value of the second temperature controller (6) setting；
The sensor fibre length wound on first heating module and the second heating module is s meters；Arr1 [i] and arr2 [i] is respectively
The quantized value of the light intensity of i-th point of anti-Stokes light and Stokes light on the sensor fibre wound on first heating module
The amount of the light intensity of i-th point of anti-Stokes light and Stokes light on the sensor fibre wound on Ratio and the second heating module
Change value Ratio；Wherein, 0=< i=1,2,3,, <=s；Ratio_New [i] is by fitting a straight line compensated whole the
Upper i-th point of the light intensity of one sensor fibre (13) quantifies ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910532481.3A CN110196118A (en) | 2019-06-19 | 2019-06-19 | A kind of dynamic temperature calibration self-calibrating device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910532481.3A CN110196118A (en) | 2019-06-19 | 2019-06-19 | A kind of dynamic temperature calibration self-calibrating device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110196118A true CN110196118A (en) | 2019-09-03 |
Family
ID=67754802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910532481.3A Pending CN110196118A (en) | 2019-06-19 | 2019-06-19 | A kind of dynamic temperature calibration self-calibrating device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110196118A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887579A (en) * | 2019-11-08 | 2020-03-17 | 华中科技大学 | Dynamic temperature demodulation method based on distributed optical fiber Raman temperature measurement system |
| CN111024266A (en) * | 2019-12-12 | 2020-04-17 | 北京航天控制仪器研究所 | Spatial resolution testing method and device for distributed optical fiber temperature sensing system |
| CN111103067A (en) * | 2019-12-25 | 2020-05-05 | 深圳供电局有限公司 | Cable trench temperature monitoring method and system based on single-mode optical fiber |
| CN111537144A (en) * | 2020-05-27 | 2020-08-14 | 唐山兴邦管道工程设备有限公司 | Pipeline leakage optical fiber monitoring auxiliary calibration system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100128756A1 (en) * | 2007-07-18 | 2010-05-27 | Chung Lee | Dual source auto-correction in distributed temperature systems |
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN102012280A (en) * | 2010-09-29 | 2011-04-13 | 中国计量学院 | HiBi-FLM (High Birefringence Fiber Loop Mirror) temperature sensor and device based on PCF-LPG (Photonic Crystal Fiber-Long Period Grating) differential demodulation |
| CN202274951U (en) * | 2011-10-26 | 2012-06-13 | 珠海拓普智能电气股份有限公司 | Temperature calibration device of distributing type optical fiber temperature measuring system |
| JP2012242124A (en) * | 2011-05-16 | 2012-12-10 | Yokogawa Electric Corp | Optical fiber temperature distribution measuring apparatus |
| CN103185647A (en) * | 2011-12-29 | 2013-07-03 | 昆山蓝岭科技有限公司 | Thermostatic bath |
| CN107271076A (en) * | 2017-06-27 | 2017-10-20 | 北京卫星环境工程研究所 | Distributed fiber optic temperature automatic calibration system and method are used under high vacuum thermal environment |
| CN108458814A (en) * | 2018-07-09 | 2018-08-28 | 太原理工大学 | Self calibration detection device towards fiber Raman temperature-sensing system and temperature demodulation method |
| CN211013294U (en) * | 2019-06-19 | 2020-07-14 | 陕西煤业化工技术研究院有限责任公司 | Raman temperature measuring instrument |
-
2019
- 2019-06-19 CN CN201910532481.3A patent/CN110196118A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100128756A1 (en) * | 2007-07-18 | 2010-05-27 | Chung Lee | Dual source auto-correction in distributed temperature systems |
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN102012280A (en) * | 2010-09-29 | 2011-04-13 | 中国计量学院 | HiBi-FLM (High Birefringence Fiber Loop Mirror) temperature sensor and device based on PCF-LPG (Photonic Crystal Fiber-Long Period Grating) differential demodulation |
| JP2012242124A (en) * | 2011-05-16 | 2012-12-10 | Yokogawa Electric Corp | Optical fiber temperature distribution measuring apparatus |
| CN202274951U (en) * | 2011-10-26 | 2012-06-13 | 珠海拓普智能电气股份有限公司 | Temperature calibration device of distributing type optical fiber temperature measuring system |
| CN103185647A (en) * | 2011-12-29 | 2013-07-03 | 昆山蓝岭科技有限公司 | Thermostatic bath |
| CN107271076A (en) * | 2017-06-27 | 2017-10-20 | 北京卫星环境工程研究所 | Distributed fiber optic temperature automatic calibration system and method are used under high vacuum thermal environment |
| CN108458814A (en) * | 2018-07-09 | 2018-08-28 | 太原理工大学 | Self calibration detection device towards fiber Raman temperature-sensing system and temperature demodulation method |
| CN211013294U (en) * | 2019-06-19 | 2020-07-14 | 陕西煤业化工技术研究院有限责任公司 | Raman temperature measuring instrument |
Non-Patent Citations (1)
| Title |
|---|
| 金钟燮 等: "基于动态多段温度标定的分布式光纤Raman测温***", 光子学报, vol. 40, no. 09, 30 September 2011 (2011-09-30), pages 1297 - 1302 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887579A (en) * | 2019-11-08 | 2020-03-17 | 华中科技大学 | Dynamic temperature demodulation method based on distributed optical fiber Raman temperature measurement system |
| CN111024266A (en) * | 2019-12-12 | 2020-04-17 | 北京航天控制仪器研究所 | Spatial resolution testing method and device for distributed optical fiber temperature sensing system |
| CN111103067A (en) * | 2019-12-25 | 2020-05-05 | 深圳供电局有限公司 | Cable trench temperature monitoring method and system based on single-mode optical fiber |
| CN111537144A (en) * | 2020-05-27 | 2020-08-14 | 唐山兴邦管道工程设备有限公司 | Pipeline leakage optical fiber monitoring auxiliary calibration system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110196118A (en) | A kind of dynamic temperature calibration self-calibrating device and method | |
| CN102147297B (en) | Distributed optical fiber temperature sensing measurement device and method | |
| CN201845405U (en) | Optical fiber grating temperature fire alarm system employing combination of etalon and temperature control grating | |
| CN103364107B (en) | Optical fiber Raman cable temperature monitoring and alarm system with attenuation self-compensation | |
| CN201909686U (en) | Distributed optical fiber temperature sensing and measuring device | |
| CN103398801B (en) | A kind of optical fiber grating temperature measurement mechanism and measuring method | |
| CN107179421B (en) | Flow sensor probe and flow velocity measuring system | |
| CN204422102U (en) | Fiber optic temperature Real-Time Monitoring and dynamic calibration apparatus | |
| CN103364112A (en) | Parameter calibration and automatic correction method for distributed optical fiber temperature measurement system | |
| CN107422215A (en) | A kind of current-carrying capacity of cable monitoring method and system based on distributed optical fiber temperature measurement technology | |
| CN101364335B (en) | On-line real-time optical fiber grating fire monitoring system | |
| CN103344265B (en) | A kind of fiber Bragg grating (FBG) demodulator | |
| CN102680131A (en) | Distributed fiber grating temperature measurement sensing device | |
| CN202204618U (en) | Calibration device used for cladding material infrared optical-fiber thermodetector | |
| CN211013294U (en) | Raman temperature measuring instrument | |
| CN103698047A (en) | High-voltage electrical equipment non-contact fluorescence temperature measurement system | |
| CN106441385A (en) | Wavelength-all-same fiber grating spectrum demodulation method and fiber grating demodulation system | |
| CN103575402B (en) | Non-refrigerated infrared detector relative spectral response new testing device for temperature properties and method | |
| CN103259609B (en) | Point type high-voltage transmission line optical fiber detection network | |
| CN104655320A (en) | Tunable OFGB (optical fiber Bragg grating) low temperature sensor | |
| CN205785514U (en) | A kind of all-fiber power measuring system for high-capacity optical fiber laser | |
| CN203811294U (en) | Fiber-Raman cable-temperature monitoring and alarm system with attenuation self-compensating function | |
| CN102104229A (en) | Wavelength control device and method of single frequency laser | |
| CN202221347U (en) | Tubular heating temperature calibrating device | |
| CN206047769U (en) | Optical fiber sensing measuring system |
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 |