CN109060191A - A kind of optical fiber temperature measurement system parameter calibration method, device and parameter system - Google Patents
A kind of optical fiber temperature measurement system parameter calibration method, device and parameter system Download PDFInfo
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- CN109060191A CN109060191A CN201810977719.9A CN201810977719A CN109060191A CN 109060191 A CN109060191 A CN 109060191A CN 201810977719 A CN201810977719 A CN 201810977719A CN 109060191 A CN109060191 A CN 109060191A
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of optical fiber temperature measurement system parameter calibration methods, apparatus and system, this method comprises: acquisition is placed in the intensity signal of anti-Stokes light and stokes light at two optical cable rings in two thermostats；The first beam intensity ratio and the second beam intensity ratio at two optical cable rings are calculated according to the intensity signal of acquisition；According to two light intensity, when the fit correlation formula of temperature and beam intensity ratio calculates separately first temperature and second temperature of two optical cable rings；Judge two differences of the preset temperature of two temperature and two thermostats whether within the scope of allowable error；If current fit correlation formula to be determined as to the thermometric calculating formula of system in range.By applying the present invention, only needing the temperature measurement device of standard, realization fast, easily carries out secondary calibration, and allowable error range can be set according to demand, constantly the parameter of adjustment system, obtained result are more nearly true value, realize high-precision measurement.
Description
Technical field
The present invention relates to optical fiber temperature sensor technology fields, and in particular to a kind of optical fiber temperature measurement system parameter calibration method,
Apparatus and system.
Background technique
Optical fiber distributed temperature detection technique, also referred to as distributed optical fiber temperature measurement technology, it is former according to optical time domain reflection
Reason and Raman scattering effect to the sensitive to realize temperature detection of temperature, total system using optical fiber as sensitive information sense with
The carrier of signal transmission has the characteristics that continuous temperature measurement, distributed temperature measuring, implements thermometric, long-range monitoring, is widely used in pipe
The industries such as road, tunnel, cable, petroleum and petrochemical industry and coal mine.
Distributed fiber optic temperature detection system in use, influence distributed optical fiber temperature measurement product temperature measurement accuracy because
Element, other than system noise, there are one the parameter calibration accuracys that important factor is exactly system.The parameter calibration of system
More accurate, the measurement accuracy and temperature measurement accuracy of system are higher.Current existing parameter calibration method is before using to optical fiber
Parameter, which only carries out once demarcating, just solidifies parameter in systems, and this method can not solve to change in system mode or optical cable connects
Head repeatedly plug when caused parameter error problem, accuracy in detection when system detection is poor.
Summary of the invention
In view of this, the present invention provides a kind of optical fiber temperature measurement system parameter calibration method, apparatus and systems to solve now
There is in technology parameter calibration method that can not solve system mode to change or when fiber cable joint repeatedly plugs caused parameter error, be
The poor problem of accuracy in detection of uniting.
To achieve the above object, the present invention adopts the following technical scheme:
First aspect present invention proposes a kind of optical fiber temperature measurement system parameter calibration method, comprising: step a: acquisition is placed in
The intensity signal of the anti-Stokes light and stokes light at two optical cable rings in two thermostats；Step b: according to acquisition
Anti-Stokes light and the intensity signal of stokes light the first beam intensity ratio and at two optical cable rings is calculated
Two beam intensity ratios；Step c: damage when the Raman diffused light is transmitted along optical fiber according to first beam intensity ratio, the second light intensity
The temperature of consumption compensation building and the fit correlation formula of beam intensity ratio calculate separately the first temperature and the second optical cable ring of the first optical cable ring
Second temperature；Step d: judge the first difference and second temperature of the preset temperature of first temperature and the first thermostat
Whether the second difference of the preset temperature of degree and the second thermostat is within the scope of allowable error；If first difference and the
Current fit correlation formula is then determined as the thermometric of the optical fiber temperature measurement system within the scope of the allowable error by two differences
Calculating formula.
With reference to first aspect, in first aspect first embodiment, if first difference and/or the second difference are not
Within the scope of the allowable error, then according to the preset temperature of first temperature and/or second temperature and the thermostat
The coefficient in the fit correlation formula is adjusted, the step c is returned, until first difference and the second difference permit described
Perhaps in error range.
With reference to first aspect, in first aspect second embodiment, the fit correlation formula are as follows:
Ti=m × Ri+ a, i=1,2,3 ... n
Wherein, parameter m and a indicates optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiFor temperature measuring point pair
Light intensity the ratio between of the anti-Stokes light and stokes light answered in incidence end.
Second aspect of the present invention proposes a kind of optical fiber temperature measurement system parameter calibration device, comprising: optical power acquisition module,
For acquiring the intensity signal of anti-Stokes light and stokes light at two optical cable rings being placed in two thermostats；Light
By force than computing module, for being calculated described in two according to the intensity signal of the anti-Stokes light of acquisition and stokes light
The first beam intensity ratio and the second beam intensity ratio at optical cable ring；Optical cable ring temperature computation module, for according to first beam intensity ratio, the
Two light intensity when the Raman diffused light along optical fiber transmit when loss balancing building temperature and beam intensity ratio fit correlation formula
Calculate separately the first temperature of the first optical cable ring and the second temperature of the second optical cable ring；Error judgment module, it is described for judging
First difference of the preset temperature of the first temperature and the first thermostat and the preset temperature of the second temperature and the second thermostat
The second difference whether within the scope of allowable error；Thermometric calculating formula output module, if first difference and the second difference
Within the scope of the allowable error, current fit correlation formula is determined as the optical fiber by the thermometric calculating formula output module
The thermometric calculating formula of temp measuring system simultaneously exports.
In conjunction with second aspect, in second aspect first embodiment, optical fiber temperature measurement system parameter calibration device further include:
Parameter adjustment module, if first difference and/or the second difference, not within the scope of the allowable error, the parameter adjusts
Module adjusts in the fit correlation formula according to the preset temperature of first temperature and/or second temperature and the thermostat
Coefficient, and the optical cable ring temperature computation module is triggered, until first difference and the second difference are in allowable error model
In enclosing.
In conjunction with second aspect, in second aspect second embodiment, the fit correlation formula are as follows:
Ti=m × Ri+ a, i=1,2,3 ... n
Wherein, two parameters m and a indicate optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiFor thermometric
The corresponding anti-Stokes light of point and stokes light incidence end the ratio between light intensity,
Third aspect present invention proposes a kind of parameter calibration system of optical fiber temperature-measurement, comprising: processing terminal, temperature measuring optical
Fine, two optical cable rings and two thermostats, the optical cable ring are one section in the temperature-measuring optical fiber, will be located at the temperature-measuring optical fiber
Two sections of different location are coiled into the shape of a disc to form two optical cable rings, and two optical cable rings are placed in two thermostats
It is interior；
The processing terminal carries out light using optical fiber temperature measurement system parameter calibration method described in first aspect present invention
The parameter calibration of fine temp measuring system obtains thermometric calculating formula.
Technical solution of the present invention has the advantages that
In optical fiber temperature measurement system parameter calibration method provided by the invention, apparatus and system, by the song of temperature and beam intensity ratio
Line relationship is fitted to linear relation, therefore only can calculate temperature by two thermostats, adjusting parameter, than in the prior art
Entire optical fiber be placed in isoperibol and acquire the point on whole optical fiber method it is more simple and easy to operate, while in site of deployment
As long as there is the temperature measurement device of standard, so that it may fast, easily carry out secondary calibration, avoid due to system mode change or light
Parameter error problem caused by the multiple plug of cable joint.Primary calibration is only carried out in compared with the prior art to be just solidificated in parameter
Method calibration in system is more accurate, and in addition the allowable error range of system can be set according to demand, constantly be adjusted
The parameter of system, obtained result are more nearly true value, realize high-precision measurement.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of a specific example of optical fiber temperature measurement system parameter calibration method in the embodiment of the present invention 1；
Fig. 2 is the temperature of optical fiber temperature measurement system parameter calibration method and the fit correlation of beam intensity ratio in the embodiment of the present invention 1
Curve；
Fig. 3 is the functional block diagram of a specific example of optical fiber temperature measurement system parameter calibration device in the embodiment of the present invention 2；
Fig. 4 is the principle frame of another specific example of optical fiber temperature measurement system parameter calibration device in the embodiment of the present invention 2
Figure；
Fig. 5 is the structural schematic diagram of the parameter calibration system of optical fiber temperature-measurement in the embodiment of the present invention 3.
Appended drawing reference:
1- optical power acquisition module；2- beam intensity ratio computing module；3- optical cable ring temperature computation module；4- error judgment mould
Block；5- thermometric calculating formula output module；6- parameter adjustment module；7- processing terminal；8- optical cable ring A；9- optical cable ring B；10- first
Thermostat；The second thermostat of 11-；12- temperature-measuring optical fiber.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of optical fiber temperature measurement system parameter calibration method, as shown in Figure 1, including the following steps:
Step S101: acquisition is placed in anti-Stokes light and stokes light at two optical cable rings in two thermostats
Intensity signal；
Step S102: two optical cables are calculated according to the intensity signal of the anti-Stokes light of acquisition and stokes light
The first beam intensity ratio and the second beam intensity ratio at ring；
Step S103: loss balancing when Raman diffused light is transmitted along optical fiber according to the first beam intensity ratio, the second light intensity
The temperature of building and the fit correlation formula of beam intensity ratio calculate separately the first optical cable ring the first temperature and the second optical cable ring second
Temperature；
Step S104: judge the first difference and second temperature and second of the preset temperature of the first temperature and the first thermostat
Whether the second difference of the preset temperature of thermostat is within the scope of allowable error；
Step S105: if the first difference and the second difference within the scope of allowable error, by current fit correlation
Formula is determined as the thermometric calculating formula of optical fiber temperature measurement system.
Preferably, as shown in Figure 1, if the first difference and/or the second difference be not in allowable error range in step S104
It is interior, then the coefficient in fit correlation formula is adjusted according to the preset temperature of the first temperature and/or second temperature and thermostat, returned
Step S103, until the first difference and the second difference are within the scope of allowable error.
In the embodiment of the present invention, in the thermometric calculating formula for determining optical fiber temperature measurement system, the first temperature and first is judged
Second difference of the preset temperature of the first difference and second temperature and the second thermostat of the preset temperature of thermostat, as long as two
Any one of difference requires the coefficient in adjustment fit correlation formula, and return step not within the scope of allowable error
S103 retrieves the temperature at two optical cable rings, and is compared, until two differences are all within the scope of allowable error.
Preferably, the fit correlation formula of temperature and beam intensity ratio can be as shown in formula (1):
Ti=m × Ri+ a, i=1,2,3 ... n formula (1)
Wherein, parameter m and a indicates optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiFor temperature measuring point pair
Light intensity the ratio between of the anti-Stokes light and stokes light answered in incidence end.
As a kind of specific embodiment, it is assumed that the temperature of two thermostats is 0 DEG C and 100 DEG C, the be calculated
One temperature and second temperature are respectively 5 DEG C and 95 DEG C, at this time during the adjustment of parameter, should be gradually increased the value of m, Zhi Dao
One difference and the second difference are within the scope of allowable error.It should be noted that this is merely illustrative, but in practical application
In, according to the value of actual temperature adjusting parameter, the temperature of two thermostats can be set to other temperature, and the present invention is not with this
It is limited, in addition, the liquid in two thermostats can also be according to requiring to place.Also, above-mentioned fit correlation formula is to be fitted to
Straight line expression formula, according to the relationship of the temperature of calculating and luminous intensity, the expression formula for being fitted generation is also likely to be curve representation formula etc.,
The present invention is not limited thereto.
The fit correlation formula of temperature and light intensity can be obtained by process below in the embodiment of the present invention:
First according to the available formula of temperature-measuring system of distributed fibers demodulation principle (2):
Wherein, Pas(T)、PsIt (T) is to transmit anti-Stokes light and stokes light backwards in the light intensity of incidence end respectively；
C is constant；Kas、KasCoefficient respectively related with stokes scattering in optical fiber and anti-Stokes scattering section；νas、νs
The respectively frequency of stokes light and anti-Stokes light；αas、αsRespectively stokes light and anti-Stokes light is in light
Attenuation coefficient when being transmitted in fibre；L is the position that spontaneous Raman scattering occurs in optical fiber；H is Planck's constant；Δ ν is Raman
Frequency displacement；K is Boltzmann constant；T is absolute temperature.
In actual demodulation, loss when transmitting first to Raman diffused light along optical fiber is compensated, and obtains formula (3):
Wherein, R (T) is the beam intensity ratio after loss balancing.In this way, beam intensity ratio R (T) is along optical fiber when to mono- timing of testing temperature T
It is certain value in whole length.
Formula (2) is converted, the relationship of available temperature and beam intensity ratio, is indicated with formula (4):
According to formula (4), T~R relation curve can be made as shown in figure 3, wherein assuming KasAnd KsIt is equal, C=1.By
Fig. 2 is it is found that when temperature is within the scope of 0 DEG C~100 DEG C, the relationship approximately linear of temperature and beam intensity ratio, therefore can be intended
It is combined into formula (1), has just obtained the fit correlation formula of temperature and beam intensity ratio.
Optical fiber temperature measurement system parameter calibration method in the embodiment of the present invention, fit correlation formula first is simple, by temperature with
The curved line relation of beam intensity ratio is fitted to linear relation, therefore only can calculate temperature by two thermostats, adjusting parameter, than
In the prior art entire optical fiber be placed in isoperibol and acquire the point on whole optical fiber method it is more simple and easy to operate, simultaneously
As long as having the temperature measurement device of standard in site of deployment, so that it may fast, easily carry out secondary calibration, avoid due to system shape
State changes or the caused parameter error problem of multiple plug of fiber cable joint.Primary calibration is only carried out in compared with the prior art just will
Parameter solidify method in systems calibration it is more accurate, in addition the error of system can be set according to demand, constantly adjust
The parameter of whole system, obtained result are more nearly true value, and high-precision measurement may be implemented.
Embodiment 2
The embodiment of the present invention provides a kind of optical fiber temperature measurement system parameter calibration device, as shown in Figure 3, comprising:
Optical power acquisition module 1, for acquiring the anti-Stokes light at two optical cable rings being placed in two thermostats
With the intensity signal of stokes light；
Beam intensity ratio computing module 2, for being calculated according to the anti-Stokes light of acquisition and the intensity signal of stokes light
Obtain the first beam intensity ratio and the second beam intensity ratio at two optical cable rings；
Optical cable ring temperature computation module 3, for according to the first beam intensity ratio, the second light intensity when Raman diffused light along optical fiber pass
The temperature of loss balancing building and the fit correlation formula of beam intensity ratio when defeated calculate separately the first temperature and the of the first optical cable ring
The second temperature of two optical cable rings；
Error judgment module 4, the first difference and second of the preset temperature for judging the first temperature and the first thermostat
Whether the second difference of the preset temperature of temperature and the second thermostat is within the scope of allowable error；
Thermometric calculating formula output module 5, if the first difference and the second difference, within the scope of allowable error, thermometric calculates
Current fit correlation formula is determined as the thermometric calculating formula of optical fiber temperature measurement system and exported by formula output module.
Preferably, as shown in figure 4, optical fiber temperature measurement system parameter calibration device further include:
Parameter adjustment module 6, if the first difference and/or the second difference, not within the scope of allowable error, parameter adjusts mould
Root tuber is triggered according to the coefficient in the preset temperature of the first temperature and/or second temperature and thermostat adjustment fit correlation formula
Optical cable ring temperature computation module, until the first difference and the second difference are within the scope of allowable error.
In the embodiment of the present invention, in the thermometric calculating formula for determining optical fiber temperature measurement system, the first temperature and first is judged
Second difference of the preset temperature of the first difference and second temperature and the second thermostat of the preset temperature of thermostat, as long as two
Any one of difference requires the coefficient in adjustment fit correlation formula, and trigger optical cable ring not within the scope of allowable error
Temperature computation module retrieves the temperature at two optical cable rings, and is compared, until two differences are all in allowable error model
In enclosing.
Preferably, the fit correlation formula of temperature and beam intensity ratio can be as shown in formula (1):
Ti=m × Ri+ a, i=1,2,3 ... n formula (1)
Wherein, parameter m and a indicates optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiFor temperature measuring point pair
Light intensity the ratio between of the anti-Stokes light and stokes light answered in incidence end.
As a kind of specific embodiment, it is assumed that the temperature of two thermostats is 0 DEG C and 100 DEG C, the be calculated
One temperature and second temperature are respectively 5 DEG C and 95 DEG C, at this time during the adjustment of parameter, should be gradually increased the value of m, Zhi Dao
One difference and the second difference are within the scope of allowable error.It should be noted that this is merely illustrative, but in practical application
In, according to the value of actual temperature adjusting parameter, the temperature of two thermostats can be set to other temperature, and the present invention is not with this
It is limited, in addition, the liquid in two thermostats can also be according to requiring to place.Also, above-mentioned fit correlation formula is to be fitted to
Straight line expression formula, according to the relationship of the temperature of calculating and luminous intensity, the expression formula for being fitted generation is also likely to be curve representation formula etc.,
The present invention is not limited thereto.
The fit correlation formula of temperature and light intensity can be obtained by process below in the embodiment of the present invention:
First according to the available formula of temperature-measuring system of distributed fibers demodulation principle (2):
Wherein, Pas(T)、PsIt (T) is to transmit anti-Stokes light and stokes light backwards in the light intensity of incidence end respectively；
C is constant；Kas、KasCoefficient respectively related with stokes scattering in optical fiber and anti-Stokes scattering section；νas、νs
The respectively frequency of stokes light and anti-Stokes light；αas、αsRespectively stokes light and anti-Stokes light is in light
Attenuation coefficient when being transmitted in fibre；L is the position that spontaneous Raman scattering occurs in optical fiber；H is Planck's constant；Δ ν is Raman
Frequency displacement；K is Boltzmann constant；T is absolute temperature.
In actual demodulation, loss when transmitting first to Raman diffused light along optical fiber is compensated, and obtains formula (3):
Wherein, R (T) is the beam intensity ratio after loss balancing.In this way, beam intensity ratio R (T) is along optical fiber when to mono- timing of testing temperature T
It is certain value in whole length.
Formula (2) is converted, the relationship of available temperature and beam intensity ratio, is indicated with formula (4):
According to formula (4), T~R relation curve can be made as shown in 3 figures, wherein assuming KasAnd KsIt is equal, C=1.By
Fig. 2 is it is found that when temperature is within the scope of 0 DEG C~100 DEG C, the relationship approximately linear of temperature and beam intensity ratio, therefore can be intended
It is combined into formula (1), so that it may obtain the fit correlation formula of temperature and beam intensity ratio.
Optical fiber temperature measurement system parameter calibration device in the embodiment of the present invention, fit correlation formula used is simple, by temperature
It is fitted to linear relation with the curved line relation of beam intensity ratio, therefore only can calculate temperature by two thermostats, adjusting parameter,
Than in the prior art entire optical fiber be placed in isoperibol and acquire the point on whole optical fiber method it is simple and easy to operate, while
As long as site of deployment has the temperature measurement device of standard, so that it may fast, easily carry out secondary calibration, avoid due to system mode
Change or the multiple of fiber cable joint plugs caused parameter error problem.Primary calibration is only carried out in compared with the prior art will just join
Several method calibration solidified in systems are more accurate, and in addition the error of system can be set according to demand, constantly be adjusted
The parameter of system, obtained result are more nearly true value, and high-precision measurement may be implemented.
Embodiment 3
The embodiment of the present invention provides a kind of parameter calibration system of optical fiber temperature-measurement, as shown in Figure 5: include: processing terminal 7,
Temperature-measuring optical fiber 12, optical cable ring A8, optical cable ring B9 and two thermostats 10,11, optical cable ring is one section in temperature-measuring optical fiber, by thermometric
Optical fiber be located at different location two sections are coiled into the shape of a disc to form two optical cable rings 8,9, and two optical cable rings are placed in two constant temperature
In slot 10,11；Processing terminal 7 carries out optical fiber temperature-measurement using the optical fiber temperature measurement system parameter calibration method in the embodiment of the present invention 1
The parameter calibration of system obtains thermometric calculating formula.
In the embodiment of the present invention, fit correlation formula used in the parameter calibration system of optical fiber temperature-measurement is simple, by temperature and light
The curved line relation of strong ratio is fitted to linear relation, therefore only can calculate temperature, adjusting parameter, than existing by two thermostats
There is entire optical fiber in technology to be placed in isoperibol and the method for acquiring the point on whole optical fiber is simple and easy to operate, while applying
As long as there is the temperature measurement device of standard at scene, so that it may fast, easily carry out secondary calibration, avoid changing due to system mode
Or parameter error problem caused by the multiple plug of fiber cable joint.Primary calibration is only carried out in compared with the prior art just to consolidate parameter
The method calibration changed in systems is more accurate, and in addition the error of system can be set according to demand, constantly adjustment system
Parameter, obtained result is more nearly true value, realizes high-precision measurement.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (7)
1. a kind of optical fiber temperature measurement system parameter calibration method, which comprises the steps of:
Step a: acquisition is placed in the light intensity of anti-Stokes light and stokes light at two optical cable rings in two thermostats
Information；
Step b: two optical cable rings are calculated according to the intensity signal of the anti-Stokes light of acquisition and stokes light
First beam intensity ratio and the second beam intensity ratio at place；
Step c: loss balancing when Raman diffused light is transmitted along optical fiber according to first beam intensity ratio, the second light intensity constructs
Temperature and the fit correlation formula of beam intensity ratio calculate separately the first temperature of the first optical cable ring and the second temperature of the second optical cable ring；
Step d: judge the first difference and the second temperature and the of the preset temperature of first temperature and the first thermostat
Whether the second difference of the preset temperature of two thermostats is within the scope of allowable error；
If within the scope of the allowable error, current fit correlation formula is determined for first difference and the second difference
For the thermometric calculating formula of the optical fiber temperature measurement system.
2. optical fiber temperature measurement system parameter calibration method according to claim 1, which is characterized in that if first difference
And/or second difference not within the scope of the allowable error, then according to first temperature and/or second temperature and the perseverance
The preset temperature of warm slot adjusts the coefficient in the fit correlation formula, returns to the step c, until first difference and second
Difference is within the scope of the allowable error.
3. optical fiber temperature measurement system parameter calibration method according to claim 1, which is characterized in that the fit correlation formula
Are as follows:
Ti=m × Ri+ a, i=1,2,3 ... n
Wherein, parameter m and a indicates optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiIt is corresponding for temperature measuring point
The ratio between the light intensity of anti-Stokes light and stokes light in incidence end.
4. a kind of optical fiber temperature measurement system parameter calibration device characterized by comprising
Optical power acquisition module, for acquiring anti-Stokes light and Si Tuo at two optical cable rings being placed in two thermostats
The intensity signal of Ke Si light；
Beam intensity ratio computing module, for being calculated two according to the anti-Stokes light of acquisition and the intensity signal of stokes light
The first beam intensity ratio and the second beam intensity ratio at a optical cable ring；
Optical cable ring temperature computation module, for according to first beam intensity ratio, the second light intensity when the Raman diffused light along light
The temperature of loss balancing building and the fit correlation formula of beam intensity ratio when fibre transmission calculate separately the first temperature of the first optical cable ring
With the second temperature of the second optical cable ring；
Error judgment module, for judging the first difference and described the of the preset temperature of first temperature and the first thermostat
Whether the second difference of the preset temperature of two temperature and the second thermostat is within the scope of allowable error；
Thermometric calculating formula output module, it is described if first difference and the second difference are within the scope of the allowable error
Current fit correlation formula is determined as the thermometric calculating formula of the optical fiber temperature measurement system and exported by thermometric calculating formula output module.
5. optical fiber temperature measurement system parameter calibration device according to claim 4, which is characterized in that further include: parameter adjustment
Module, if first difference and/or the second difference not within the scope of the allowable error, the parameter adjustment module according to
The preset temperature of first temperature and/or second temperature and the thermostat adjusts the coefficient in the fit correlation formula,
And the optical cable ring temperature computation module is triggered, until first difference and the second difference are within the scope of allowable error.
6. optical fiber temperature measurement system parameter calibration device according to claim 4, which is characterized in that the fit correlation formula
Are as follows:
Ti=m × Ri+ a, i=1,2,3 ... n
Wherein, two parameters m and a indicate optical fiber temperature measurement system characteristic, TiFor the temperature that scattering position occurs, RiFor temperature measuring point pair
Light intensity the ratio between of the anti-Stokes light and stokes light answered in incidence end.
7. a kind of parameter calibration system of optical fiber temperature-measurement characterized by comprising processing terminal, temperature-measuring optical fiber, two optical cable rings
With two thermostats,
The optical cable ring is one section in the temperature-measuring optical fiber, will be located at two sections of disks of the temperature-measuring optical fiber different location into disk
Shape forms two optical cable rings, and two optical cable rings are placed in two thermostats；
The processing terminal carries out light using optical fiber temperature measurement system parameter calibration method as claimed in any one of claims 1-3
The parameter calibration of fine temp measuring system obtains thermometric calculating formula.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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