CN108693164B - Temperature demodulation method, device and system based on optical fiber Raman scattering signal - Google Patents
Temperature demodulation method, device and system based on optical fiber Raman scattering signal Download PDFInfo
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- CN108693164B CN108693164B CN201810632641.7A CN201810632641A CN108693164B CN 108693164 B CN108693164 B CN 108693164B CN 201810632641 A CN201810632641 A CN 201810632641A CN 108693164 B CN108693164 B CN 108693164B
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Abstract
The invention provides a temperature demodulation method, a device and a system based on optical fiber Raman scattering signals, relates to the technical field of temperature sensing, and aims to obtain two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment; performing weighted average operation by combining the stable signals at the previous moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point, and calculating the ratio of the stable signals; carrying out weighted average operation by combining the ratio stable data at the previous moment to obtain ratio stable data; and obtaining the temperature data of the target monitoring point according to the ratio stable data and a preset database. The invention respectively carries out weighted average processing on the data of the two fiber Raman scattering signals and the ratio of the two stable signals and the previous moment, so that the mutation signals are smoother, abnormal signals caused by environmental noise factors are effectively reduced, and the temperature measurement is more stable and accurate.
Description
Technical Field
The invention relates to the technical field of temperature sensing, in particular to a temperature demodulation method, a temperature demodulation device and a temperature demodulation system based on optical fiber Raman scattering signals.
Background
The Optical fiber Raman temperature measurement system is a novel sensing system which is realized by utilizing a spontaneous Raman scattering effect in an Optical fiber and combining an Optical Time Domain Reflectometer (OTDR) technology and can be used for distributed, continuous and real-Time measurement of spatial temperature field distribution. Compared with the traditional electronic temperature sensor, the optical fiber Raman temperature measurement system has the advantages of electromagnetic interference resistance, high voltage resistance, simple structure and the like, so that the optical fiber Raman temperature measurement system is widely applied to the fields of power cable temperature monitoring, structure health monitoring, dam leakage monitoring and the like.
The current temperature demodulation method based on fiber Raman scattering comprises the following steps: the system collects Raman scattering signals when light emitted by the narrow-band light source is transmitted in the optical fiber, the ratio of anti-Stokes light signals in the Raman scattering signals to Stokes mercerized signals is calculated, and the ambient temperature is obtained according to the linear relation between the ratio and the temperature.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, and a system for temperature demodulation based on fiber raman scattering signals, which respectively perform weighted average processing on three data, i.e., ratio data of a fiber raman scattering stokes mercerized demodulation signal, a fiber raman scattering anti-stokes photo demodulation signal, and a two stable signals, with the data at the previous time, so that the mutated signals are smoother, abnormal signals caused by environmental noise factors are effectively reduced, and temperature measurement is more stable and accurate.
In a first aspect, an embodiment of the present invention provides a temperature demodulation method based on a fiber raman scattering signal, including:
acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment; the two fiber raman scattering signals are: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal;
combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, and performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point;
calculating the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment;
carrying out weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point;
and obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and a preset database.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where before combining stable signals of two types of fiber raman scattering signals at a previous time, and performing a weighted average operation on the two types of fiber raman scattering signals at a current time to obtain stable signals of the two types of fiber raman scattering signals at the current time of a target fiber measurement point, the method further includes:
respectively filtering two optical fiber Raman scattering signals at the current moment to obtain two filtered optical fiber Raman scattering signals;
performing moving average processing on the two filtered fiber Raman scattering signals to obtain two average signals; the two average signals are: a fiber raman scattering stokes optical demodulation average signal, a fiber raman scattering anti-stokes optical demodulation average signal.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the performing, by combining stable signals of two types of fiber raman scattering signals at a previous time, a weighted average operation on the two types of fiber raman scattering signals at a current time to obtain stable signals of the two types of fiber raman scattering signals at the current time of the target fiber measurement point specifically includes:
performing weighted average operation on the stable signal of the fiber Raman scattering Stokes optical demodulation signal at the previous moment and the fiber Raman scattering Stokes optical demodulation average signal to obtain the stable signal of the fiber Raman scattering Stokes optical demodulation signal at the current moment;
and performing weighted average operation on the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the previous moment and the fiber Raman scattering anti-Stokes optical demodulation average signal to obtain the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the current moment.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where calculating a ratio of stable signals of two fiber raman scattering signals at a current time specifically includes:
and dividing the stable signal of the optical fiber Raman scattering Stokes optical demodulation signal at the current moment by the stable signal of the optical fiber Raman scattering anti-Stokes optical demodulation signal at the current moment to obtain the ratio of the stable signals of the two optical fiber Raman scattering signals.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where before acquiring two fiber raman scattering signals of a current time of a target fiber measurement point of a target monitoring point acquired by a temperature sensing device, the method further includes:
and determining the number of target optical fiber measuring points of the target monitoring points according to the optical fiber length data of the engineering site.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where when a plurality of target optical fiber measurement points are provided, obtaining temperature data of a target monitoring point according to ratio stable data of the target optical fiber measurement points at the current time and a preset database includes:
carrying out mean value calculation on the ratio stability data of the target optical fiber measuring points at the current moment to obtain the ratio stability data of the target monitoring points at the current moment;
taking the ratio stability data of the current moment of the target monitoring point as a keyword, and retrieving from temperature-ratio relation information in a preset database to obtain a temperature value matched with the ratio stability data of the current moment of the target monitoring point;
and correcting the temperature value according to preset parameters in a preset database to obtain the temperature data of the target monitoring point.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where after obtaining temperature data of a target monitoring point according to ratio stable data of a target optical fiber measurement point at a current time and a preset database, the method further includes:
and sending the temperature data to a display terminal so that the display terminal displays the temperature data.
In a second aspect, an embodiment of the present invention further provides a temperature demodulation apparatus based on a fiber raman scattering signal, including:
the signal acquisition module is used for acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point at the current moment, which are acquired by the temperature sensing device; the two fiber raman scattering signals are: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal;
the first calculation module is used for combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, carrying out weighted average operation on the two optical fiber Raman scattering signals at the current moment, and obtaining the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point;
the second calculation module is used for calculating the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment;
the third calculation module is used for performing weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point;
and the temperature determining module is used for obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and the preset database.
In a third aspect, an embodiment of the present invention further provides a temperature demodulation system based on a fiber raman scattering signal, including: the system comprises a processor, a temperature sensing device and a display terminal;
the processor is provided with a temperature demodulation device based on the fiber Raman scattering signal as described in the second aspect;
the processor is respectively in communication connection with the temperature sensing device and the display terminal.
In a fourth aspect, the present invention also provides a computer readable medium having non-volatile program code executable by a processor, where the program code causes the processor to execute the method according to the first aspect.
The embodiment of the invention has the following beneficial effects:
the temperature demodulation method based on the optical fiber Raman scattering signals provided by the embodiment of the invention comprises the steps of firstly, acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment; the two fiber raman scattering signals are: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal; combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, and performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point; calculating the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment; carrying out weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point; and obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and a preset database. According to the embodiment of the invention, the weighted average processing of the data at the last moment is respectively carried out on the three data of the optical fiber Raman scattering Stokes mercerization demodulation signal, the optical fiber Raman scattering anti-Stokes photolysis signal and the ratio data of the two stable signals, so that the mutated signals are smoother, abnormal signals caused by environmental noise factors are effectively reduced, and the temperature measurement is more stable and accurate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a temperature demodulation method based on a fiber raman scattering signal according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for temperature demodulation based on fiber raman scattering signals according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for temperature demodulation based on fiber raman scattering signals according to an embodiment of the present invention;
fig. 4 is a flowchart of another method for temperature demodulation based on fiber raman scattering signals according to an embodiment of the present invention;
fig. 5 is a flowchart of another method for temperature demodulation based on fiber raman scattering signals according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a temperature demodulating apparatus based on a fiber raman scattering signal according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of a temperature demodulation system based on a fiber raman scattering signal according to a third embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
The existing temperature demodulation method based on optical fiber Raman scattering only calculates the ratio of an anti-Stokes light signal and a Stokes mercerization signal in a Raman scattering signal, obtains the environmental temperature according to the linear relation of the ratio and the temperature, and has insufficient abnormal data processing capacity caused by possible environmental noise factors, so that the accuracy of an optical fiber Raman temperature measurement result is insufficient.
Based on this, embodiments of the present invention provide a method, an apparatus, and a system for temperature demodulation based on fiber raman scattering signals, which respectively perform weighted average processing on three types of data, namely, ratio data of a fiber raman scattering stokes mercerized demodulation signal, a fiber raman scattering anti-stokes photo demodulation signal, and a two stable signals, with data at the previous time, so that a mutated signal is smoother, abnormal signals caused by environmental noise factors are effectively reduced, and temperature measurement is more stable and accurate.
For the convenience of understanding the present embodiment, a detailed description will be first given of a temperature demodulation method based on a fiber raman scattering signal disclosed in the present embodiment.
The first embodiment is as follows:
the embodiment of the invention provides a temperature demodulation method based on a fiber Raman scattering signal, which is executed at a processor end and is shown in FIG. 1, and the method comprises the following steps:
s101: acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment; the two fiber raman scattering signals are: fiber Raman scattering Stokes optical demodulation signals and fiber Raman scattering anti-Stokes optical demodulation signals.
When the temperature sensor is used for realizing the temperature measurement, the processor firstly obtains optical fiber Raman scattering signals of target optical fiber measurement points of target monitoring points acquired by the temperature sensor, wherein one target monitoring point can correspond to one target optical fiber measurement point or a plurality of target optical fiber measurement points. The determination of the number of specific target fiber measurement points is described in the following steps. The fiber Raman scattering signal corresponding to a target fiber measurement point comprises: fiber Raman scattering Stokes optical demodulation signals and fiber Raman scattering anti-Stokes optical demodulation signals.
S102: and combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, and performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point.
And performing weighted average operation on the obtained fiber Raman scattering Stokes light demodulation signal and the obtained fiber Raman scattering anti-Stokes light demodulation signal by combining stable signals at the previous moment respectively corresponding to the two signals, wherein the weight factor can be determined and adjusted according to the average value of the signal values at the previous moment and the current moment and the historical closeness of historical data, and the higher the historical closeness is, the higher the weight is, the lower the historical closeness is, and the lower the weight is.
S103: and calculating the ratio of the stable signals of the two fiber Raman scattering signals at the current moment.
Specifically, the stable signal of the optical fiber raman scattering stokes light demodulation signal at the current moment is divided by the stable signal of the optical fiber raman scattering anti-stokes light demodulation signal at the current moment to obtain the ratio of the stable signals of the two optical fiber raman scattering signals.
S104: and performing weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point.
After the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment is calculated, the ratio stable data at the previous moment is further combined, and weighted average operation is carried out on the ratio at the current moment to obtain the ratio stable data at the current moment of the target optical fiber measuring point. The weighting factor in the weighted average operation can be determined and adjusted according to the historical closeness of the historical data and the mean value of the ratio value of the previous moment and the current moment, wherein the higher the historical closeness is, the larger the weighting is, the lower the historical closeness is, and the smaller the weighting is.
S105: and obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and a preset database.
The preset database includes a temperature-ratio relationship and other preset parameters, such as sensitivity parameters, calibration data, etc. According to the ratio stability data of the target optical fiber measuring point at the current moment, searching from the temperature-ratio relation in the preset database, finding the temperature value corresponding to the ratio stability data, and further according to other preset parameters in the preset database, adjusting and calibrating the temperature value to obtain the final temperature data of the target monitoring point.
As a preferred embodiment, in step S102: before combining the stable signals of the two fiber raman scattering signals at the previous time and performing weighted average operation on the two fiber raman scattering signals at the current time to obtain the stable signals of the two fiber raman scattering signals at the current time of the target fiber measurement point, the method further includes the following steps, as shown in fig. 2:
s201: and respectively filtering the two fiber Raman scattering signals at the current moment to obtain two filtered fiber Raman scattering signals.
S202: and performing moving average processing on the two filtered fiber Raman scattering signals to obtain two average signals.
The two average signals are: a fiber raman scattering stokes optical demodulation average signal, a fiber raman scattering anti-stokes optical demodulation average signal. The processor acquires the fiber Raman scattering Stokes mercerization demodulation signal acquired by the temperature sensing device, namely the fiber Raman scattering anti-Stokes photodemodulation signal, and the two signals. The two parts of signals are respectively subjected to filtering and a moving average algorithm to obtain two stable average signals, so that the abnormity caused by environmental noise factors can be further reduced, and the accuracy and the stability of temperature measurement are improved.
Further, the step S103: combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point, and specifically comprising the following processes:
and performing weighted average operation on the stable signal of the fiber Raman scattering Stokes optical demodulation signal at the previous moment and the fiber Raman scattering Stokes optical demodulation average signal to obtain the stable signal of the fiber Raman scattering Stokes optical demodulation signal at the current moment.
And performing weighted average operation on the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the previous moment and the fiber Raman scattering anti-Stokes optical demodulation average signal to obtain the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the current moment.
In step S101: before acquiring two optical fiber raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment, the method further includes the following steps, as shown in fig. 3:
s301: and determining the number of target optical fiber measuring points of the target monitoring points according to the optical fiber length data of the engineering site.
Specifically, the number of target optical fiber measurement points corresponding to the target monitoring point may be determined according to the optical fiber length data of the engineering field, for example, a longer optical fiber is reused at one target monitoring point, for example, a 1m optical fiber is coiled around the target monitoring point, in order to improve the temperature measurement accuracy, one target optical fiber measurement point is set for each crude 0.1m optical fiber, and for a 1m optical fiber, there are 10 target optical fiber measurement points. And then, obtaining the ratio stable data corresponding to each target optical fiber measuring point through the steps S101-S104.
In this case, the step S105: obtaining temperature data of a target monitoring point according to ratio stability data of a target optical fiber measuring point at the current moment and a preset database, and specifically comprising the following steps, as shown in fig. 4:
s401: and carrying out average value calculation on the ratio stability data of the plurality of target optical fiber measuring points at the current moment to obtain the ratio stability data of the target monitoring points at the current moment.
And after the ratio stable data corresponding to each target optical fiber measuring point is obtained, carrying out mean value calculation on the plurality of ratio stable data so as to obtain the ratio stable data of the target monitoring point at the current moment. The following steps S402 and S403 are then performed.
S402: and taking the ratio stability data of the current moment of the target monitoring point as a keyword, and retrieving from the temperature-ratio relation information in the preset database to obtain a temperature value matched with the ratio stability data of the current moment of the target monitoring point.
S403: and correcting the temperature value according to preset parameters in a preset database to obtain the temperature data of the target monitoring point.
And (3) according to the ratio stable data of the target monitoring point at the current moment, searching and matching from a preset database to obtain a temperature value, and then adjusting and correcting the temperature through preset parameters in the database to obtain the final temperature data of the target monitoring point. The process can combine the actual optical fiber length data on site to carry out data acquisition and weighted average processing for a plurality of target optical fiber measuring points of the same site monitoring point for a plurality of times, and can obtain more accurate temperature data.
In step S105: after the temperature data of the target monitoring point is obtained according to the ratio stable data of the target optical fiber measuring point at the current moment and the preset database, the method further comprises the following steps, as shown in fig. 5:
s501: and sending the temperature data to a display terminal so that the display terminal displays the temperature data.
The above display terminal includes various different types of display devices, such as: desktop computers, smart phones, ipads, etc. The temperature data of the target monitoring point is displayed through a client page on the display terminal, so that the user can conveniently refer and judge to perform subsequent operations and the like.
According to the temperature demodulation method based on the optical fiber Raman scattering signals, the three data of the optical fiber Raman scattering Stokes mercerization demodulation signal, the optical fiber Raman scattering anti-Stokes optical demodulation signal and the ratio data of the two stable signals are respectively subjected to weighted average processing with the data at the previous moment, so that the mutated signals are smoother, abnormal signals caused by environmental noise factors are effectively reduced, and the temperature measurement is more stable and accurate. In addition, the number of target optical fiber measuring points of the same field monitoring point can be determined by combining field actual optical fiber length data, and multiple data acquisition and weighted average processing are carried out on multiple target optical fiber measuring points of the same field monitoring point, so that the system robustness is improved, the sensing precision is improved, and more accurate temperature data is obtained.
Example two:
an embodiment of the present invention further provides a temperature demodulation apparatus based on an optical fiber raman scattering signal, as shown in fig. 6, the apparatus includes: the device comprises a signal acquisition module 21, a first calculation module 22, a second calculation module 23, a third calculation module 24 and a temperature determination module 25.
The signal acquisition module 21 is configured to acquire two optical fiber raman scattering signals at a current time of a target optical fiber measurement point of a target monitoring point, which are acquired by the temperature sensing device; the two fiber raman scattering signals are: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal; the first calculation module 22 is configured to perform weighted average operation on the two fiber raman scattering signals at the current time by combining the stable signals of the two fiber raman scattering signals at the previous time, so as to obtain stable signals of the two fiber raman scattering signals at the current time of the target fiber measurement point; the second calculating module 23 is configured to calculate a ratio of stable signals of two optical fiber raman scattering signals at the current time; the third calculation module 24 is configured to perform weighted average operation on the ratio at the current time by combining the ratio stability data at the previous time to obtain the ratio stability data at the current time of the target optical fiber measurement point; and the temperature determining module 25 is configured to obtain temperature data of the target monitoring point according to the ratio stability data of the target optical fiber measuring point at the current time and a preset database.
In the temperature demodulation apparatus based on the fiber raman scattering signal provided by the embodiment of the present invention, each module has the same technical characteristics as the temperature demodulation method based on the fiber raman scattering signal, and therefore, the above functions can be achieved as well. The specific working process of each module in the device refers to the above method embodiment, and is not described herein again.
Example three:
an embodiment of the present invention further provides a temperature demodulation system based on a fiber raman scattering signal, as shown in fig. 7, the system includes: a processor 32, a temperature sensing device 31 and a display terminal 33; the processor 32 is provided with a temperature demodulating device 321 based on the fiber raman scattering signal as described in embodiment two; the processor 32 is in communication connection with the temperature sensing device 31 and the display terminal 33, respectively.
The temperature demodulation system based on the fiber Raman scattering signal provided by the embodiment of the invention has the same technical characteristics as the temperature demodulation device based on the fiber Raman scattering signal, so the functions can be realized. The specific working process of each module in the system refers to the above method embodiment, and is not described herein again.
The computer program product of the temperature demodulation method based on the fiber raman scattering signal provided in the embodiment of the present invention includes a computer readable storage medium storing a nonvolatile program code executable by a processor, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, and will not be described herein again.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatus and the electronic device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A temperature demodulation method based on fiber Raman scattering signals is characterized by comprising the following steps:
acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point acquired by a temperature sensing device at the current moment; the two fiber Raman scattering signals are respectively as follows: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal;
combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, and performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point;
calculating the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment;
carrying out weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point;
and obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and a preset database.
2. The method of claim 1, further comprising, before combining the stable signals of the two fiber raman scattering signals at the previous time and performing a weighted average operation on the two fiber raman scattering signals at the current time to obtain the stable signals of the two fiber raman scattering signals at the current time of the target fiber measurement point:
respectively filtering the two fiber Raman scattering signals at the current moment to obtain two filtered fiber Raman scattering signals;
performing moving average processing on the two filtered fiber Raman scattering signals to obtain two average signals; the two average signals are respectively: a fiber raman scattering stokes optical demodulation average signal, a fiber raman scattering anti-stokes optical demodulation average signal.
3. The method according to claim 2, wherein the combining the stable signals of the two fiber raman scattering signals at the previous time, and performing a weighted average operation on the two fiber raman scattering signals at the current time to obtain the stable signals of the two fiber raman scattering signals at the current time of the target fiber measurement point specifically includes:
performing weighted average operation on the stable signal of the optical fiber Raman scattering Stokes optical demodulation signal at the previous moment and the optical fiber Raman scattering Stokes optical demodulation average signal to obtain the stable signal of the optical fiber Raman scattering Stokes optical demodulation signal at the current moment;
and performing weighted average operation on the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the previous moment and the fiber Raman scattering anti-Stokes optical demodulation average signal to obtain the stable signal of the fiber Raman scattering anti-Stokes optical demodulation signal at the current moment.
4. The method according to claim 3, wherein the calculating the ratio of the stable signals of the two fiber Raman scattering signals at the current time specifically comprises:
and dividing the stable signal of the optical fiber Raman scattering Stokes optical demodulation signal at the current moment by the stable signal of the optical fiber Raman scattering anti-Stokes optical demodulation signal at the current moment to obtain the ratio of the stable signals of the two optical fiber Raman scattering signals.
5. The method of claim 1, further comprising, prior to said acquiring two fiber raman scattering signals at a current time of a target fiber measurement point of a target monitoring point acquired by a temperature sensing device:
and determining the number of target optical fiber measuring points of the target monitoring points according to the optical fiber length data of the engineering site.
6. The method according to claim 1, wherein when the number of the target optical fiber measurement points is multiple, the obtaining the temperature data of the target monitoring point according to the ratio stability data of the target optical fiber measurement points at the current time and a preset database specifically comprises:
carrying out mean value calculation on the ratio stability data of the current time of a plurality of target optical fiber measuring points to obtain the ratio stability data of the current time of the target monitoring points;
searching from the temperature-ratio relation information in the preset database by taking the ratio stability data of the current moment of the target monitoring point as a keyword to obtain a temperature value matched with the ratio stability data of the current moment of the target monitoring point;
and correcting the temperature value according to preset parameters in the preset database to obtain the temperature data of the target monitoring point.
7. The method of claim 1, wherein after obtaining the temperature data of the target monitoring point according to the ratio-stabilized data of the target optical fiber measuring point at the current time and a preset database, the method further comprises:
and sending the temperature data to a display terminal so that the display terminal displays the temperature data.
8. A temperature demodulating apparatus based on a fiber raman scattering signal, comprising:
the signal acquisition module is used for acquiring two optical fiber Raman scattering signals of a target optical fiber measuring point of a target monitoring point at the current moment, which are acquired by the temperature sensing device; the two fiber Raman scattering signals are respectively as follows: the optical fiber Raman scattering Stokes optical demodulation signal and the optical fiber Raman scattering anti-Stokes optical demodulation signal;
the first calculation module is used for combining the stable signals of the two optical fiber Raman scattering signals at the previous moment, and performing weighted average operation on the two optical fiber Raman scattering signals at the current moment to obtain the stable signals of the two optical fiber Raman scattering signals at the current moment of the target optical fiber measuring point;
the second calculation module is used for calculating the ratio of the stable signals of the two optical fiber Raman scattering signals at the current moment;
the third calculation module is used for performing weighted average operation on the ratio of the current moment by combining the ratio stable data of the previous moment to obtain the ratio stable data of the current moment of the target optical fiber measuring point;
and the temperature determining module is used for obtaining the temperature data of the target monitoring point according to the ratio stable data of the target optical fiber measuring point at the current moment and a preset database.
9. A temperature demodulation system based on fiber raman scattering signals, comprising: the system comprises a processor, a temperature sensing device and a display terminal;
the processor is provided with the temperature demodulation device based on the fiber Raman scattering signal according to claim 8;
the processor is in communication connection with the temperature sensing device and the display terminal respectively.
10. A computer-readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of any of claims 1 to 7.
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