CN210981573U - Temperature measuring device for large-core-diameter multimode optical fiber - Google Patents
Temperature measuring device for large-core-diameter multimode optical fiber Download PDFInfo
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- CN210981573U CN210981573U CN201921806801.1U CN201921806801U CN210981573U CN 210981573 U CN210981573 U CN 210981573U CN 201921806801 U CN201921806801 U CN 201921806801U CN 210981573 U CN210981573 U CN 210981573U
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Abstract
The embodiment of the utility model discloses temperature measuring device of big core footpath multimode fiber, a serial communication port, the device includes: the sweep frequency light source is used for providing linear sweep frequency light with the center wavelength of 1550nm for the device; the first optical fiber coupler is used for dividing the linear frequency sweeping light into a first frequency sweeping optical signal and a second frequency sweeping optical signal; an auxiliary interference module for receiving the first scanning optical signal to generate a clock signal; the main interference module receives the second sweep optical signal to generate a beat frequency interference signal; the data acquisition module receives the clock signal and the beat frequency interference signal and outputs the clock signal and the beat frequency interference signal to the data processing module; and the data processing module is used for generating the temperature data of the large-core-diameter multimode optical fiber based on the signals received by the data acquisition module. Therefore, the temperature of the large-core-diameter multimode optical fiber is simply and quickly measured, the measurement efficiency is greatly improved, and the measurement cost is reduced.
Description
Technical Field
The embodiment of the utility model provides a relate to the optical fiber sensing field, especially relate to carry out temperature measuring's a temperature measuring device of big core footpath multimode optic fibre to big core footpath special type multimode energy optic fibre.
Background
With the continuous progress of energy photoelectronic technology, various novel high-power lasers and laser processing equipment are continuously emerging, the laser equipment adopts a mode of outputting laser by optical fibers to replace the traditional output mode, and especially the requirements of energy transmission optical fibers and external members thereof are increased. The energy optical fiber has excellent characteristics, so that the energy optical fiber has good application in the field of high-power light energy transmission, such as laser transmission, laser coupling, laser welding, laser cutting, laser medical field and the like.
In the field of laser transmission, a large-core-diameter special multimode energy transmission optical fiber can be used as an output optical fiber of a laser, and can also realize remote energy transmission, and whether the internal temperature of the optical fiber is increased by a high-power energy signal or not needs to be considered while transmitting a high-power energy signal, so that the structural characteristics of the optical fiber are affected, for example, an optical fiber coating layer may absorb the transmitted energy, or the transmitted high-power signal may cause the local temperature of the bent part of the optical fiber to be too high, so that the structural fault of the optical fiber is caused, and the. Therefore, the temperature detection of the large-core diameter energy transmission optical fiber is very important, and the early warning of structural damage can be realized by detecting the temperature index reflecting the structural health state.
However, utility model people are realizing the utility model discloses an in-process discovery, some optic fibre temperature measurement techniques that have now all construct based on single mode fiber, to big core footpath multimode fiber, how to carry out temperature measurement high-efficiently is the problem that awaits a urgent need to solve.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a temperature measuring device of big core footpath multimode fiber has solved the temperature measurement problem of big core footpath characteristic multimode energy optic fibre.
In a first aspect, an embodiment of the present invention provides a temperature measuring device for large core diameter multimode optical fiber, including:
the sweep frequency light source is used for providing linear sweep frequency light with the center wavelength of 1550nm for the device;
the first optical fiber coupler is used for dividing the linear frequency sweeping light into a first frequency sweeping optical signal and a second frequency sweeping optical signal;
an auxiliary interferometer receiving the first swept optical signal to generate a clock signal;
a main interference branch comprising a main interferometer for receiving the second swept optical signal to generate a beat frequency interference signal;
the data acquisition card receives the clock signal and the beat frequency interference signal and outputs the clock signal and the beat frequency interference signal to a computer;
and the computer is used for generating the temperature data of the large-core-diameter multimode optical fiber based on the signals received by the data acquisition module.
Optionally, the main interference branch may include:
the system comprises a first optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a first optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein:
the second fiber coupler divides the second sweep optical signal into two paths, and one path of the second sweep optical signal passes through the polarization controller to obtain a reference arm signal and enters the third fiber coupler; the other path of the signal is transmitted to the third optical fiber coupler through the first port of the large-core-diameter multi-mode circulator, the optical fiber to be tested, the second port of the large-core-diameter multi-mode circulator, the third port of the large-core-diameter multi-mode circulator and the mode matcher to obtain a signal arm signal;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are orthogonal to each other, and outputs the first optical signal and the second optical signal to the photodetector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module.
Optionally, the pattern matcher may include:
the first-stage pattern matcher and the second-stage pattern matcher are connected in series; wherein:
the input end of the first-stage mode matcher is connected with a 105 mu m/125 mu m special multimode fiber, and the output end of the first-stage mode matcher is connected with a 62.5 mu m/125 mu m multimode fiber;
the input end of the second-stage mode matcher is connected with the 62.5 mu m/125 mu m multimode fiber, and the output end of the second-stage mode matcher is connected with the 10 mu m/125 mu m single mode fiber.
Optionally, the optical fiber to be tested may include a large-core-diameter multimode energy transmission optical fiber.
Optionally, the auxiliary interference module may include a mach-zehnder interferometer.
Through the utility model provides a temperature measuring device of big core footpath multimode optic fibre utilizes the OFDR technique, can effectively carry out temperature measurement to big core footpath special type multimode biography energy optic fibre, when expanding the application of OFDR technique, greatly reduced measurement cost.
In a second aspect, an embodiment of the present invention further provides a method for measuring temperature of a large-core-diameter multimode optical fiber, where the method may include:
providing linear sweep-frequency light with the center wavelength of 1550nm for the device by utilizing a sweep-frequency light source;
dividing the linear frequency-swept light into a first frequency-swept optical signal and a second frequency-swept optical signal by using a first optical fiber coupler;
receiving the first scanning optical signal by using an auxiliary interference module to generate a clock signal;
receiving the second sweep frequency optical signal by using a main interference module to generate a beat frequency interference signal;
and receiving the clock signal and the beat frequency interference signal by using a data acquisition module to generate temperature data of the large-core-diameter multimode optical fiber.
Optionally, the main interference branch may include:
the system comprises a first optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a first optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein:
the second fiber coupler divides the second sweep optical signal into two paths, and one path of the second sweep optical signal passes through the polarization controller to obtain a reference arm signal and enters the third fiber coupler; the other path of the signal is transmitted to the third optical fiber coupler through the first port of the large-core-diameter multi-mode circulator, the optical fiber to be tested, the second port of the large-core-diameter multi-mode circulator, the third port of the large-core-diameter multi-mode circulator and the mode matcher to obtain a signal arm signal;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are orthogonal to each other, and outputs the first optical signal and the second optical signal to the photodetector;
the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition module.
Optionally, the pattern matcher may include:
the first-stage pattern matcher and the second-stage pattern matcher are connected in series; wherein:
the input end of the first-stage mode matcher is connected with a 105 mu m/125 mu m special multimode fiber, and the output end of the first-stage mode matcher is connected with a 62.5 mu m/125 mu m multimode fiber;
the input end of the second-stage mode matcher is connected with the 62.5 mu m/125 mu m multimode fiber, and the output end of the second-stage mode matcher is connected with the 10 mu m/125 mu m single mode fiber.
Optionally, the optical fiber to be tested may include a large-core-diameter multimode energy transmission optical fiber.
Optionally, the auxiliary interference module may include a mach-zehnder interferometer.
Through the utility model provides a temperature measurement method of big core footpath multimode fiber utilizes the OFDR technique, can effectively carry out temperature measurement to big core footpath special type multimode biography energy optic fibre, when expanding OFDR technique and using, greatly reduced measurement cost. Meanwhile, the problem that insertion loss is overlarge when optical signals are transmitted from the large-core-diameter multimode optical fiber to the small-core-diameter single-mode optical fiber when the large-core-diameter multimode optical fiber carries out temperature sensing is solved.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a temperature measuring device for providing a large-core-diameter multimode optical fiber according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a temperature measuring device for a large-core-diameter multimode optical fiber according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a preferred multimode device portion of a temperature measuring device for a large-core multimode optical fiber according to an embodiment of the present invention.
Reference numerals:
1-scanning a light source; 2-an auxiliary interference module; 3-a main interference module; 4-DAQ data acquisition module; 5-a data processing module; a 6-mach-zehnder interferometer; 7-a first fiber coupler; 8-a second fiber coupler; 9-a polarization controller; 10-a third fiber coupler; 11-a clock signal; 12-a pattern matcher; 13-large core diameter multimode circulator; 14-optical fiber to be tested: a large-core-diameter multimode energy transmission optical fiber; 15-a polarizing beam splitter; 16-a photodetector;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The utility model discloses aim at setting up one set of temperature measuring device based on big core footpath special type multimode biography can optic fibre, its characterized in that changes the key device in the single mode OFDR system, when solving big core footpath multimode optic fibre and carrying out temperature sensing, insertion loss is too big problem when transmitting optical signal to little core footpath single mode optic fibre from big core footpath multimode optic fibre to OFDR system's applied scene has been extended.
Fig. 1 shows a schematic structural diagram of a temperature measuring device of a large-core-diameter multimode optical fiber, as shown in fig. 1, the whole system is composed of a sweep light source, an auxiliary interference module, a main interference module and a data acquisition module, and the auxiliary interferometer and the main interferometer can be Mach-Zehnder interferometers. The sweep frequency light source provides linear sweep frequency light with the center wavelength of 1550nm for the system, the sweep frequency light is divided into two paths, one path enters the auxiliary interferometer to generate an external clock signal used by the data acquisition module, the other path enters the main interferometer to generate a beat frequency interference signal to be acquired by the data acquisition module finally, and the beat frequency interference signal is input into the data processing module (for example, a PC) and is subjected to calculation processing to obtain temperature data.
Fig. 2 shows a more specific structural schematic diagram of the temperature measuring device for the large-core-diameter multimode optical fiber, where the temperature measuring device includes:
the sweep frequency light source is used for providing linear sweep frequency light with the center wavelength of 1550nm for the device;
a first fiber coupler c1 for splitting the linear swept frequency light into a first swept frequency optical signal and a second swept frequency optical signal; two paths of sweep frequency optical signals respectively enter an auxiliary interference module (branch) and a main interference module (branch);
an auxiliary interference module for receiving the first scanning optical signal to generate a clock signal; the first scanned optical signal may be interfered by a mach-zehnder interferometer as an auxiliary interferometer to generate a clock signal;
the main interference module receives the second sweep optical signal to generate a beat frequency interference signal;
when the second swept-frequency optical signal enters the main interference module, the first swept-frequency optical signal can be interfered by taking the mach-zehnder interferometer as a main interferometer and then input to the second optical fiber coupler c 2; or directly inputting the second swept optical signal to the second fiber coupler c 2;
the second fiber coupler c2 divides the second swept-frequency optical signal into two paths, one path of the second swept-frequency optical signal passes through a polarization controller to obtain a reference arm signal, and the reference arm signal enters the third fiber coupler c 3; the other path of the signal is subjected to signal arm signal acquisition through the first port of the large-core-diameter multimode circulator, the optical fiber to be tested, the second port of the large-core-diameter multimode circulator, the third port of the large-core-diameter multimode circulator and the mode matcher, and enters the third optical fiber coupler c 3; because of the optical frequency domain reflection OFDR effect, the rayleigh backscattering signal in the signal arm and the optical signal in the reference arm have a time delay introduced by an optical path difference, so that the frequencies of the optical signals carried by the two paths of signals are different, and the two paths of signals are mixed in the third optical fiber coupler c 3.
After entering the polarization beam splitter, the mixing signal is divided into two paths of light S light and P light which are orthogonal to each other (so as to eliminate the influence caused by the polarization fading effect), beat frequency interference occurs on the photosensitive surface of the photoelectric detector, and meanwhile, the photoelectric detector converts the interference light signal into an electric signal which is input into a data acquisition card to finish the signal acquisition.
The DAQ data acquisition module, which can be a DAQ data acquisition card for example, receives the clock signal and the beat frequency interference signal and outputs the clock signal and the beat frequency interference signal to the data processing module;
the data processing module can be a device with computing capability, such as a personal computer or a server, and the temperature data of the large-core-diameter multimode optical fiber is obtained through calculation by a predetermined algorithm based on the signal data received by the data acquisition module.
In this temperature measuring device, 2 wavelength scans are required for temperature sensing. Once as reference data and once as measurement data when the temperature changes. The original data obtained by each scanning is the distribution of scattered light and reflected light on the whole length of the sensing optical fiber in the scanning wavelength range, so that the scattered light and the reflected light need to be converted into the distribution of scattered and reflected light intensity along the length of the optical fiber through Fourier transform, then cross-correlation operation is carried out on the reference data and the measured data to obtain the change information of Rayleigh scattering spectrum frequency shift, and the temperature change information on the whole section of the energy-transferring optical fiber to be measured can be obtained because the frequency spectrum movement is caused by the external temperature change. In this way, the temperature data of the large-core-diameter multimode optical fiber can be effectively calculated.
Through the utility model provides a big core footpath multimode fiber temperature measuring device of this kind can realize the temperature measurement of big core footpath multimode fiber high-efficiently swiftly, and the system complexity is low, and is with low costs, and is efficient, has solved simultaneously when big core footpath multimode fiber carries out temperature sensing, the too big problem of insertion loss when transmitting the light signal to little core footpath multimode fiber from big core footpath multimode fiber.
Preferably, fig. 3 shows a schematic structural diagram of a multimode device part of a temperature measuring device for a large-core-diameter multimode optical fiber, and we improve a mode matcher and use the two-stage serial mode matcher to perform mode conversion.
Referring to fig. 3, a single-mode OFDR system is improved based on a large-core-diameter multimode energy transmission fiber, wherein sweep light enters a port 1 of a large-core-diameter multimode circulator from a single-mode fiber (when an optical signal enters the large-core-diameter multimode fiber from the small-core-diameter single-mode fiber, the insertion loss is very small and can be ignored), enters the large-core-diameter multimode energy transmission fiber of a fiber to be tested through a port 2 of the circulator, and simultaneously, the port 2 receives a rayleigh scattering signal returned by the fiber to be tested and outputs the rayleigh scattering signal through a port 3 of the circulator. The output Rayleigh scattering signal is transmitted in a special multimode fiber with the diameter of 105 mu m/125 mu m, and can be accessed into the single-mode coupler only after being converted by the mode matcher. Because the insertion loss is overlarge due to overlarge diameter difference of the core diameter when the special multimode fiber with the diameter of 105 mu m/125 mu m and the single mode fiber with the diameter of 10 mu m/125 mu m are directly matched, a two-stage mode matcher is adopted: the first-stage mode matcher is a special multimode fiber with the diameter of 105 mu m/125 mu m converted into 62.5 mu m/125 mu m, the second-stage mode matcher is 62.5 mu m/125 mu m converted into 10 mu m/125 mu m, and after the two-stage mode matcher, Rayleigh scattering signals are output by the single-mode fiber and enter the single-mode coupler. By adopting the mode that the large-core-diameter multimode circulator is directly connected with the energy transmission optical fiber to be detected and then converted and output by the two-stage mode matcher, the insertion loss of an optical signal entering the small-core-diameter single-mode optical fiber from the large-core-diameter multimode optical fiber is reduced.
On the other hand, the utility model provides a temperature measurement method of big core footpath multimode fiber. Referring to fig. 1-2, the method specifically comprises:
providing linear sweep-frequency light with the center wavelength of 1550nm for the device by utilizing a sweep-frequency light source;
dividing the linear frequency-swept light into a first frequency-swept optical signal and a second frequency-swept optical signal by using a first optical fiber coupler; two paths of sweep frequency optical signals respectively enter an auxiliary interference branch and a main interference branch;
receiving the first swept optical signal with an auxiliary interferometer to generate a clock signal; the first scanned optical signal may be interfered by a mach-zehnder interferometer as an auxiliary interferometer to generate a clock signal;
receiving the second swept optical signal by using a main interferometer to generate a beat frequency interference signal; when the second swept-frequency optical signal enters the main interference module, the first swept-frequency optical signal can be interfered by taking the mach-zehnder interferometer as a main interferometer and then input to the second optical fiber coupler c 2; or directly inputting the second swept optical signal to the second fiber coupler c 2;
the second fiber coupler c2 divides the second swept-frequency optical signal into two paths, one path of the second swept-frequency optical signal passes through a polarization controller to obtain a reference arm signal, and the reference arm signal enters the third fiber coupler c 3; the other path of the signal is subjected to signal arm signal acquisition through the first port of the large-core-diameter multimode circulator, the optical fiber to be tested, the second port of the large-core-diameter multimode circulator, the third port of the large-core-diameter multimode circulator and the mode matcher, and enters the third optical fiber coupler c 3; due to the optical frequency domain reflection OFDR technology, the rayleigh backscattering signal in the signal arm and the optical signal in the reference arm have time delay introduced by the optical path difference, so that the frequencies of the optical signals carried by the two paths of signals are different, and the frequency mixing is performed in the third optical fiber coupler c 3.
After entering the polarization beam splitter, the mixing signal is divided into two paths of light S light and P light which are orthogonal to each other (so as to eliminate the influence caused by the polarization fading effect), beat frequency interference occurs on the photosensitive surface of the photoelectric detector, and meanwhile, the photoelectric detector converts the interference light signal into an electric signal which is connected into a data acquisition card to finish the signal acquisition.
And receiving the clock signal and the beat frequency interference signal by using a data acquisition module to generate temperature data of the large-core-diameter multimode optical fiber.
In the temperature measurement method, 2 wavelength scans are required when temperature sensing is performed. Once as reference data and once as measurement data when the temperature changes. The original data obtained by each scanning is the distribution of scattered light and reflected light on the whole length of the sensing optical fiber in the scanning wavelength range, so that the scattered light and the reflected light need to be converted into the distribution of scattered and reflected light intensity along the length of the optical fiber through Fourier transform, then cross-correlation operation is carried out on the reference data and the measured data to obtain the change information of Rayleigh scattering spectrum frequency shift, and the temperature change information on the whole section of the energy-transferring optical fiber to be measured can be obtained because the frequency spectrum movement is caused by the external temperature change. In this way, the temperature data of the large-core-diameter multimode optical fiber can be effectively calculated.
Referring to fig. 3, based on a large-core-diameter multimode energy transmission fiber, an improvement is made on a single-mode OFDR system, where swept-frequency light enters a port 1 of a large-core-diameter multimode circulator from a single-mode fiber (when an optical signal enters the large-core-diameter multimode fiber from a small-core-diameter single-mode fiber, the insertion loss is very small and negligible), enters the large-core-diameter multimode energy transmission fiber of the fiber to be tested through a port 2 of the circulator, and simultaneously, the port 2 receives a rayleigh scattering signal returned by the fiber to be tested and outputs the rayleigh scattering signal through a port 3 of the. The output Rayleigh scattering signal is transmitted in a special multimode fiber with the diameter of 105 mu m/125 mu m, and can be accessed into the single-mode coupler only after being converted by the mode matcher. Because the insertion loss is overlarge due to overlarge diameter difference of the core diameter when the special multimode fiber with the diameter of 105 mu m/125 mu m and the single mode fiber with the diameter of 10 mu m/125 mu m are directly matched, a two-stage mode matcher is adopted: the first-stage mode matcher is a special multimode fiber with the diameter of 105 mu m/125 mu m converted into 62.5 mu m/125 mu m, the second-stage mode matcher is 62.5 mu m/125 mu m converted into 10 mu m/125 mu m, and after the two-stage mode matcher, Rayleigh scattering signals are output by the single-mode fiber and enter the single-mode coupler. By adopting the mode that the large-core-diameter multimode circulator is directly connected with the energy transmission optical fiber to be detected and then converted and output by the two-stage mode matcher, the insertion loss of an optical signal entering the small-core-diameter single-mode optical fiber from the large-core-diameter multimode optical fiber is reduced.
Through the utility model provides a big core footpath multimode fiber temperature measuring device of this kind can realize the temperature measurement of big core footpath multimode fiber high-efficiently swiftly, and the system complexity is low, and is with low costs, and is efficient, has solved simultaneously when big core footpath multimode fiber carries out temperature sensing, the too big problem of insertion loss when transmitting the light signal to little core footpath multimode fiber from big core footpath multimode fiber.
The utility model discloses the division to the module in above-mentioned embodiment is schematic, only is a logic function division, can have other division mode when actually realizing, in addition, each functional module in this application each embodiment can be integrated in a treater, also can be independent physics to exist, also can two or more than two modules integration in a module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The utility model discloses electronic equipment exists with multiple form, including but not limited to:
(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.
(3) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices.
(4) A server: the device for providing computing service, the server comprises a processor 1010, a hard disk, a memory, a system bus and the like, the server is similar to a general computer architecture, but the server needs to provide highly reliable service, so the requirements on processing capability, stability, reliability, safety, expandability, manageability and the like are high.
(5) And other electronic devices with data interaction functions.
The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
An embodiment of the present invention provides a non-volatile computer-readable storage medium, which stores program instructions for executing the method and steps of the above method embodiments when an electronic device executes the program instructions.
An embodiment of the present invention provides a computer program product, wherein the computer program product comprises a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by an electronic device, cause the electronic device to perform the method in any of the above-mentioned method embodiments.
The functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or an intelligent terminal device or a Processor (Processor) to execute some steps of the methods according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In the above embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
Claims (5)
1. A temperature measuring device for a large-core-diameter multimode optical fiber is characterized by comprising:
the sweep frequency light source is used for providing linear sweep frequency light with the center wavelength of 1550nm for the device;
the first optical fiber coupler is used for dividing the linear frequency sweeping light into a first frequency sweeping optical signal and a second frequency sweeping optical signal;
an auxiliary interferometer receiving the first swept optical signal to generate a clock signal;
a main interference branch comprising a main interferometer for receiving the second swept optical signal to generate a beat frequency interference signal;
the data acquisition card receives the clock signal and the beat frequency interference signal and outputs the clock signal and the beat frequency interference signal to a computer;
and the computer is used for generating the temperature data of the large-core-diameter multimode optical fiber based on the signals received by the data acquisition card.
2. The thermometric apparatus of claim 1, wherein the main interference branch further comprises:
the system comprises a first optical fiber coupler, a polarization controller, a large-core-diameter multimode circulator, an optical fiber to be tested, a mode matcher, a first optical fiber coupler, a polarization beam splitter and a photoelectric detector; wherein:
the second fiber coupler divides the second sweep optical signal into two paths, and one path of the second sweep optical signal passes through the polarization controller to obtain a reference arm signal and enters the third fiber coupler; the other path of the signal is transmitted to the third optical fiber coupler through the first port of the large-core-diameter multi-mode circulator, the optical fiber to be tested, the second port of the large-core-diameter multi-mode circulator, the third port of the large-core-diameter multi-mode circulator and the mode matcher to obtain a signal arm signal;
the third optical fiber coupler mixes the reference arm signal and the signal arm signal, outputs the mixed signals to the polarization beam splitter to obtain a first optical signal and a second optical signal which are orthogonal to each other, and outputs the first optical signal and the second optical signal to the photodetector;
and the photoelectric detector converts the first optical signal and the second optical signal into electric signals and outputs the electric signals to the data acquisition card.
3. The thermometric apparatus of claim 2, wherein the pattern matcher comprises:
the first-stage pattern matcher and the second-stage pattern matcher are connected in series; wherein:
the input end of the first-stage mode matcher is connected with a 105 mu m/125 mu m special multimode fiber, and the output end of the first-stage mode matcher is connected with a 62.5 mu m/125 mu m multimode fiber;
the input end of the second-stage mode matcher is connected with the 62.5 mu m/125 mu m multimode fiber, and the output end of the second-stage mode matcher is connected with the 10 mu m/125 mu m single mode fiber.
4. The temperature measuring device according to claim 2,
the optical fiber to be tested comprises a large-core-diameter multi-mode energy transmission optical fiber.
5. The temperature measuring device according to claim 1,
the auxiliary interferometer comprises a mach-zehnder interferometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921806801.1U CN210981573U (en) | 2019-10-24 | 2019-10-24 | Temperature measuring device for large-core-diameter multimode optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110702263A (en) * | 2019-10-24 | 2020-01-17 | 国家电网有限公司 | Temperature measuring device and method for large-core-diameter multimode optical fiber |
| CN114459376A (en) * | 2022-01-28 | 2022-05-10 | 北京邮电大学 | Multi-core optical fiber three-dimensional shape sensing system based on OFDR technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110702263A (en) * | 2019-10-24 | 2020-01-17 | 国家电网有限公司 | Temperature measuring device and method for large-core-diameter multimode optical fiber |
| CN110702263B (en) * | 2019-10-24 | 2024-03-29 | 国家电网有限公司 | Temperature measuring device and method for large-core-diameter multimode optical fiber |
| CN114459376A (en) * | 2022-01-28 | 2022-05-10 | 北京邮电大学 | Multi-core optical fiber three-dimensional shape sensing system based on OFDR technology |
| CN114459376B (en) * | 2022-01-28 | 2023-03-10 | 北京邮电大学 | Multi-core optical fiber three-dimensional shape sensing system based on OFDR technology |
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