CN111928972A - Method and system for improving spatial resolution of distributed optical fiber temperature measurement system - Google Patents
Method and system for improving spatial resolution of distributed optical fiber temperature measurement system Download PDFInfo
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Abstract
A method and a system for improving the spatial resolution of a distributed optical fiber temperature measurement system are provided, the method comprises the following steps: step 1, determining sampling periods and sampling action times of each sampling period according to the required spatial resolution and sampling frequency of an acquisition card; step 2, controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using a clock controller; and 3, sequencing data obtained by multiple sampling actions in one period according to a preset rule, so as to improve the sampling frequency. The invention utilizes the system clock controller to control the sampling system to perform a plurality of actions in one period, and controls the action time of the sampling system through the clock controller, thereby equivalently improving the sampling frequency of the system and further improving the spatial resolution of the system.
Description
Technical Field
The invention relates to the field of optical fiber temperature measurement, in particular to a method and a system for improving the spatial resolution of a distributed optical fiber temperature measurement system.
Background
With the continuous increase of the capacity of a ship power system, the power supply load is continuously increased, the operation risk of the cable is higher and higher, and once the fault conditions such as breakage, short circuit and the like occur, the disastrous consequences caused by the fault conditions are more serious. Therefore, the cable needs to be monitored in real time, the temperature condition of the cable is timely mastered, and the normal operation of a ship power system is ensured.
Distributed optical fiber temperature measurement system can realize comprehensive, real-time, accurate temperature monitoring, and have advantages such as small, light in weight, electrical insulation is good, chemical corrosion resistance, high temperature resistant, sensitivity is high, the response is fast, explosion-proof, fire-proof, with low costs, anti-electromagnetic interference, can adapt to most cable operational environment, has compensatied traditional temperature sensor's defect, more is fit for using in the aspect of cable temperature detects.
Due to the particularity of the power system, a higher requirement is provided for the spatial resolution of the distributed optical fiber temperature measurement system, and the higher spatial resolution requires that the data acquisition system has a very high sampling frequency, for example, the spatial resolution of 1m requires a sampling frequency of 100MHz, and is limited by factors such as the response time of the photoelectric conversion system, the A/D conversion time and the like, so that the sampling frequency of the data sampling system is difficult to be directly increased.
Therefore, how to increase the sampling frequency of the system without considering the limiting factors such as the response time of the photoelectric conversion system, the a/D conversion time and the like is a problem mainly considered and solved by the invention.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide a method and a system for improving spatial resolution of a distributed optical fiber temperature measurement system, which overcome the above problems or at least partially solve the above problems, and the specific scheme is as follows:
as a first aspect of the present invention, there is provided a method for improving spatial resolution of a distributed optical fiber thermometry system, the method comprising:
step 1, determining sampling periods and sampling action times of each sampling period according to the required spatial resolution and sampling frequency of an acquisition card;
step 2, controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using a clock controller;
and 3, sequencing data obtained by multiple sampling actions in one period according to a preset rule, so as to improve the sampling frequency.
Further, in step 1, determining a sampling period and the number of sampling actions of each sampling period by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
Further, step 2 specifically comprises:
let n be the number of sampling actions in each sampling period, TcF represents the sampling frequency of the acquisition card for the continuous working time of each sampling action;
after the cycle starts, atWhen T is 0, the pulse light source starts to emit pump light into the optical fiber, and the interval of pulse light emitted by each light source is Tc；
At t1When the sampling time is equal to 0, the sampling system performs the first sampling action, keeps the sampling frequency f to work until the next sampling action, and continues the working time to be TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And after the nth sampling action of the sampling system is finished, ending the period and restarting timing.
Further, step 3 specifically comprises:
let n be the number of sampling actions in each sampling period, and each sampling action acquires m data, then the data acquired by the ith sampling action is labeled X in sequencei1，Xi2，……，Xim(ii) a Wherein, Xi1Representing the 1 st data, X, acquired by the ith sampling action in the cycleimRepresenting the m-th data collected by the ith sampling action in the period;
n multiplied by m data acquired by n times of sampling actions of a sampling system are acquired according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
Further, the method further comprises: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
As a second aspect of the present invention, a system for improving spatial resolution of a distributed optical fiber temperature measurement system is provided, where the system includes a sampling parameter determination module, a sampling action module, and a sorting module;
the sampling parameter determining module is used for determining sampling periods and the sampling action times of each sampling period according to the spatial resolution and the sampling frequency of the acquisition card which are required to be achieved;
the sampling action module is used for controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using the clock controller;
the sorting module is used for sorting data obtained by multiple sampling actions in one period according to a preset rule, so that the sampling frequency is improved.
Further, the sampling parameter determining module determines a sampling period and the number of sampling actions of each sampling period by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
Further, the sampling action module, which uses the clock controller to control the photoelectric conversion system and the data acquisition system of the distributed optical fiber temperature measurement system to perform multiple sampling actions according to the determined sampling action times in one period, specifically comprises:
let n be the number of sampling actions in each sampling period, TcF represents the sampling frequency of the acquisition card for the continuous working time of each sampling action;
after the period starts, at the time T equal to 0, the pulse light source starts to emit the pump light into the optical fiber, and the interval time of pulse light emitted by the light source every time is Tc；
At t1When the sampling time is equal to 0, the sampling system performs the first sampling action, keeps the sampling frequency f to work until the next sampling action, and continues the working time to be TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And after the nth sampling action of the sampling system is finished, ending the period and restarting timing.
Further, the sorting module sorts data obtained by multiple sampling actions in one period according to a preset rule, and the improvement of the sampling frequency is specifically as follows:
let n be the number of sampling actions in each sampling period, and each sampling action acquires m data, then the data acquired by the ith sampling action is labeled X in sequencei1，Xi2，……，Xim(ii) a Wherein, Xi1Representing the 1 st data, X, acquired by the ith sampling action in the cycleimRepresenting the m-th data collected by the ith sampling action in the period;
n multiplied by m data acquired by n times of sampling actions of a sampling system are acquired according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
Further, the system further comprises a demodulation module configured to: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
The invention has the following beneficial effects:
the invention provides a method for improving the spatial resolution of a distributed optical fiber temperature measurement system, which enables a photoelectric conversion system and a data acquisition system to perform n actions in one period T by setting a sampling period and sampling times, wherein the phase of each action lags behind 2 pi/n.
Drawings
Fig. 1 is a flowchart of a method for improving spatial resolution of a distributed optical fiber temperature measurement system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As a first embodiment of the present invention, a method for improving spatial resolution of a distributed optical fiber thermometry system is provided, as shown in fig. 1, the method includes:
step 1, determining sampling periods and sampling action times of each sampling period according to the required spatial resolution and sampling frequency of an acquisition card;
step 2, controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using a clock controller;
and 3, sequencing data obtained by multiple sampling actions in one period according to a preset rule, so as to improve the sampling frequency.
According to the invention, through setting the sampling period and the sampling times, the photoelectric conversion system and the data acquisition system perform multiple actions in one period, and the action time is controlled by the clock controller, so that the sampling frequency of the system is equivalently improved, and further the spatial resolution of the system is improved.
Preferably, in step 1, the sampling period and the sampling action number of each sampling period are determined by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
Preferably, step 2 is specifically:
after the period starts, at the time T equal to 0, the pulse light source starts to emit the pump light into the optical fiber, and the interval time of pulse light emitted by the light source every time is Tc；
At t1When the sampling time is equal to 0, the sampling system performs the first sampling action, keeps the sampling frequency f to work until the next sampling action, and continues the working time to be TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcM data to be collectedThe data obtained are sequentially marked with X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And obtaining n multiplied by m data through n times of sampling actions, finishing the period and restarting timing after the nth time of sampling action of the sampling system is finished.
Wherein k is more than or equal to 1 and less than or equal to n, tkIndicating the start time of the k-th sampling action.
Preferably, step 3 is specifically:
the data collected by the ith sampling action are sequentially marked with Xi1，Xi2，……，Xim(ii) a Wherein, Xi1Representing the 1 st data, X, acquired by the ith sampling action in the cycleimRepresenting the m-th data collected by the ith sampling action in the period, and collecting n multiplied by m data collected by the n sampling actions of the sampling system according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
In the above embodiment, the collected n × m data are arranged in a matrix form, XiiData representing ith row and ith columnThe reordering method is as follows: sequencing each row of data according to the row sequence, obtaining an array from each row so as to obtain m arrays, and enabling the array obtained from the ith row to be ZiThen Z isi＝{X1i，X2i，……，XniSorting the m groups according to the sequence to obtain n multiplied by m data Z after the sorting1，Z2，……，ZmWherein Z is1＝{X11，X21，……，Xn1}，Z2＝{X12，X22，……，Xn2}，Zn＝{X1m，X2m，……，Xnm}。
According to the invention, by setting the sampling period and the sampling times, the photoelectric conversion system and the data acquisition system perform n times of actions in one period T, and the phase of each action lags behind 2 pi/n.
Preferably, the method further comprises: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
As a second embodiment of the present invention, a system for improving spatial resolution of a distributed optical fiber temperature measurement system is provided, where the system includes a sampling parameter determination module, a sampling action module, and a sorting module;
the sampling parameter determining module is used for determining sampling periods and the sampling action times of each sampling period according to the spatial resolution and the sampling frequency of the acquisition card which are required to be achieved;
the sampling action module is used for controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using the clock controller;
the sorting module is used for sorting data obtained by multiple sampling actions in one period according to a preset rule, so that the sampling frequency is improved.
According to the invention, through setting the sampling period and the sampling times, the photoelectric conversion system and the data acquisition system perform multiple actions in one period, and the action time is controlled by the clock controller, so that the sampling frequency of the system is equivalently improved, and further the spatial resolution of the system is improved.
Preferably, the sampling parameter determining module determines the sampling period and the sampling action number of each sampling period by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
Preferably, the sampling action module, which uses the clock controller to control the photoelectric conversion system and the data acquisition system of the distributed optical fiber temperature measurement system to perform multiple sampling actions according to the determined sampling action times in one period, specifically comprises:
let n be the number of sampling actions in each sampling period, TcF represents the sampling frequency of the acquisition card for the continuous working time of each sampling action;
after the period starts, at the time T equal to 0, the pulse light source starts to emit the pump light into the optical fiber, and the interval time of pulse light emitted by the light source every time is Tc；
At t1When the sampling time is equal to 0, the sampling system performs the first sampling action, keeps the sampling frequency f to work until the next sampling action, and continues the working time to be TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And after the nth sampling action of the sampling system is finished, obtaining n multiplied by m data, finishing the period and restarting timing.
Preferably, the sorting module sorts data obtained by multiple sampling operations in one period according to a preset rule, and the improvement of the sampling frequency specifically includes:
let n be the number of sampling actions in each sampling period, and each sampling action acquires m data, then the data acquired by the ith sampling action is labeled X in sequencei1，Xi2，……，Xim(ii) a Wherein, Xi1Indicating the ith sample in the cycle1 st data, X, of motion acquisitionimRepresenting the m-th data collected by the ith sampling action in the period;
n multiplied by m data acquired by n times of sampling actions of a sampling system are acquired according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
In the above embodiment, the collected n × m data are arranged in a matrix form, XiiThe data representing the ith row and the ith column are reordered in the following manner: sequencing each row of data according to the row sequence, obtaining an array from each row so as to obtain m arrays, and enabling the array obtained from the ith row to be ZiThen Z isi＝{X1i，X2i，……，XniSorting the m groups according to the sequence to obtain n multiplied by m data Z after the sorting1，Z2，……，ZmWherein Z is1＝{X11，X21，……，Xn1}，Z2＝{X12，X22，……，Xn2}，Zn＝{X1m，X2m，……，Xnm}。
Preferably, the system further comprises a demodulation module for: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for improving the spatial resolution of a distributed optical fiber temperature measurement system is characterized by comprising the following steps:
step 1, determining sampling periods and sampling action times of each sampling period according to the required spatial resolution and sampling frequency of an acquisition card;
step 2, controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using a clock controller;
and 3, sequencing data obtained by multiple sampling actions in one period according to a preset rule, so as to improve the sampling frequency.
2. The method for improving the spatial resolution of the distributed optical fiber temperature measurement system according to claim 1, wherein in step 1, the sampling period and the number of sampling actions of each sampling period are determined by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
3. The method for improving the spatial resolution of the distributed optical fiber temperature measurement system according to claim 1, wherein the step 2 specifically comprises:
let n be the number of sampling actions in each sampling period, TcF represents the sampling frequency of the acquisition card for the continuous working time of each sampling action;
after the period starts, at the time T equal to 0, the pulse light source starts to emit the pump light into the optical fiber, and the interval time of pulse light emitted by the light source every time is Tc；
At t1When equal to 0, the sampling system is firstOne sampling action is carried out, the sampling frequency f is kept to work until the next sampling action is carried out, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And after the nth sampling action of the sampling system is finished, ending the period and restarting timing.
4. The method for improving the spatial resolution of the distributed optical fiber temperature measurement system according to claim 1, wherein the step 3 specifically comprises:
let n be the number of sampling actions in each sampling period, and each sampling action acquires m data, then the data acquired by the ith sampling action is labeled X in sequencei1，Xi2，……，Xim(ii) a Wherein, Xi1Representing the 1 st data, X, acquired by the ith sampling action in the cycleimRepresenting the m-th data collected by the ith sampling action in the period;
n multiplied by m data acquired by n times of sampling actions of a sampling system are acquired according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
5. The method of claim 1, further comprising: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
6. A system for improving the spatial resolution of a distributed optical fiber temperature measurement system is characterized by comprising a sampling parameter determining module, a sampling action module and a sequencing module;
the sampling parameter determining module is used for determining sampling periods and the sampling action times of each sampling period according to the spatial resolution and the sampling frequency of the acquisition card which are required to be achieved;
the sampling action module is used for controlling a photoelectric conversion system and a data acquisition system of the distributed optical fiber temperature measurement system to perform sampling actions for multiple times in one period according to the determined sampling action times by using the clock controller;
the sorting module is used for sorting data obtained by multiple sampling actions in one period according to a preset rule, so that the sampling frequency is improved.
7. The system for improving the spatial resolution of a distributed optical fiber temperature measurement system according to claim 6, wherein the sampling parameter determining module determines the sampling period and the number of sampling operations per sampling period by the following formula;
the formula I is as follows:
the formula II is as follows: T-nTc；
The formula III is as follows:
in the above formula, T is the sampling period, n is the number of sampling actions in each sampling period, TcV represents the propagation speed of light in the optical fiber, f represents the sampling frequency of the acquisition card, and delta l represents the set spatial resolution index.
8. The system for improving the spatial resolution of the distributed optical fiber temperature measurement system according to claim 6, wherein the sampling action module, using the clock controller to control the photoelectric conversion system and the data acquisition system of the distributed optical fiber temperature measurement system to perform multiple sampling actions according to the determined sampling action times in one period, specifically comprises:
let n be the number of sampling actions in each sampling period, TcF represents the sampling frequency of the acquisition card for the continuous working time of each sampling action;
after the period starts, at the time T equal to 0, the pulse light source starts to emit the pump light into the optical fiber, and the interval time of pulse light emitted by the light source every time is Tc；
At t1When the sampling time is equal to 0, the sampling system performs the first sampling action, keeps the sampling frequency f to work until the next sampling action, and continues the working time to be TcAcquiring m data, and sequentially marking the acquired data as X11，X12，……，X1mWherein
In that
And the sampling system performs the second sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as X21，X22，……，X2m；
In that
And the sampling system performs the kth sampling action, keeps the sampling frequency f to work until the next sampling action, and has the continuous working time of TcAcquiring m data, and sequentially marking the acquired data as Xk1，Xk2，……，Xkm；
In that
The nth sampling action of the sampling system is carried out, the sampling frequency f is kept to work until the next sampling action, and the continuous working time is TcAcquiring m data, and sequentially marking the acquired data as Xn1，Xn2，……，Xnm；
And after the nth sampling action of the sampling system is finished, ending the period and restarting timing.
9. The system for improving the spatial resolution of the distributed optical fiber temperature measurement system according to claim 6, wherein the sorting module sorts data obtained by a plurality of sampling operations in one period according to a preset rule, and the improvement of the sampling frequency is specifically that:
let n be the number of sampling actions in each sampling period, and each sampling action acquires m data, then the data acquired by the ith sampling action is labeled X in sequencei1，Xi2，……，Xim(ii) a Wherein, Xi1Representing the 1 st data, X, acquired by the ith sampling action in the cycleimRepresenting the m-th data collected by the ith sampling action in the period;
n multiplied by m data acquired by n times of sampling actions of a sampling system are acquired according to X11，X21，……，Xn1，X12，X22，……，Xn2，……，X1m，X2m，……，XnmIn order to achieve an increase in the sampling frequency.
10. The system of claim 6, further comprising a demodulation module configured to: and demodulating each sequenced data to obtain the temperature information of the corresponding data.
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